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<FONT color="green">001</FONT>    /**<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<FONT color="green">003</FONT>     * or more contributor license agreements.  See the NOTICE file<a name="line.3"></a>
<FONT color="green">004</FONT>     * distributed with this work for additional information<a name="line.4"></a>
<FONT color="green">005</FONT>     * regarding copyright ownership.  The ASF licenses this file<a name="line.5"></a>
<FONT color="green">006</FONT>     * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<FONT color="green">007</FONT>     * "License"); you may not use this file except in compliance<a name="line.7"></a>
<FONT color="green">008</FONT>     * with the License.  You may obtain a copy of the License at<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     *     http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<FONT color="green">011</FONT>     *<a name="line.11"></a>
<FONT color="green">012</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<FONT color="green">013</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<FONT color="green">014</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<FONT color="green">015</FONT>     * See the License for the specific language governing permissions and<a name="line.15"></a>
<FONT color="green">016</FONT>     * limitations under the License.<a name="line.16"></a>
<FONT color="green">017</FONT>     */<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    package org.apache.hadoop.mapreduce.lib.join;<a name="line.19"></a>
<FONT color="green">020</FONT>    <a name="line.20"></a>
<FONT color="green">021</FONT>    import java.io.CharArrayReader;<a name="line.21"></a>
<FONT color="green">022</FONT>    import java.io.IOException;<a name="line.22"></a>
<FONT color="green">023</FONT>    import java.io.StreamTokenizer;<a name="line.23"></a>
<FONT color="green">024</FONT>    import java.lang.reflect.Constructor;<a name="line.24"></a>
<FONT color="green">025</FONT>    import java.lang.reflect.InvocationTargetException;<a name="line.25"></a>
<FONT color="green">026</FONT>    import java.util.ArrayList;<a name="line.26"></a>
<FONT color="green">027</FONT>    import java.util.HashMap;<a name="line.27"></a>
<FONT color="green">028</FONT>    import java.util.Iterator;<a name="line.28"></a>
<FONT color="green">029</FONT>    import java.util.LinkedList;<a name="line.29"></a>
<FONT color="green">030</FONT>    import java.util.List;<a name="line.30"></a>
<FONT color="green">031</FONT>    import java.util.ListIterator;<a name="line.31"></a>
<FONT color="green">032</FONT>    import java.util.Map;<a name="line.32"></a>
<FONT color="green">033</FONT>    import java.util.Stack;<a name="line.33"></a>
<FONT color="green">034</FONT>    <a name="line.34"></a>
<FONT color="green">035</FONT>    import org.apache.hadoop.classification.InterfaceAudience;<a name="line.35"></a>
<FONT color="green">036</FONT>    import org.apache.hadoop.classification.InterfaceStability;<a name="line.36"></a>
<FONT color="green">037</FONT>    import org.apache.hadoop.conf.Configuration;<a name="line.37"></a>
<FONT color="green">038</FONT>    import org.apache.hadoop.io.WritableComparator;<a name="line.38"></a>
<FONT color="green">039</FONT>    import org.apache.hadoop.mapreduce.Counter;<a name="line.39"></a>
<FONT color="green">040</FONT>    import org.apache.hadoop.mapreduce.InputFormat;<a name="line.40"></a>
<FONT color="green">041</FONT>    import org.apache.hadoop.mapreduce.InputSplit;<a name="line.41"></a>
<FONT color="green">042</FONT>    import org.apache.hadoop.mapreduce.Job;<a name="line.42"></a>
<FONT color="green">043</FONT>    import org.apache.hadoop.mapreduce.JobContext;<a name="line.43"></a>
<FONT color="green">044</FONT>    import org.apache.hadoop.mapreduce.MRJobConfig;<a name="line.44"></a>
<FONT color="green">045</FONT>    import org.apache.hadoop.mapreduce.RecordReader;<a name="line.45"></a>
<FONT color="green">046</FONT>    import org.apache.hadoop.mapreduce.StatusReporter;<a name="line.46"></a>
<FONT color="green">047</FONT>    import org.apache.hadoop.mapreduce.TaskAttemptContext;<a name="line.47"></a>
<FONT color="green">048</FONT>    import org.apache.hadoop.mapreduce.TaskAttemptID;<a name="line.48"></a>
<FONT color="green">049</FONT>    import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;<a name="line.49"></a>
<FONT color="green">050</FONT>    import org.apache.hadoop.mapreduce.task.JobContextImpl;<a name="line.50"></a>
<FONT color="green">051</FONT>    import org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl;<a name="line.51"></a>
<FONT color="green">052</FONT>    import org.apache.hadoop.util.ReflectionUtils;<a name="line.52"></a>
<FONT color="green">053</FONT>    <a name="line.53"></a>
<FONT color="green">054</FONT>    /**<a name="line.54"></a>
<FONT color="green">055</FONT>     * Very simple shift-reduce parser for join expressions.<a name="line.55"></a>
<FONT color="green">056</FONT>     *<a name="line.56"></a>
<FONT color="green">057</FONT>     * This should be sufficient for the user extension permitted now, but ought to<a name="line.57"></a>
<FONT color="green">058</FONT>     * be replaced with a parser generator if more complex grammars are supported.<a name="line.58"></a>
<FONT color="green">059</FONT>     * In particular, this &amp;quot;shift-reduce&amp;quot; parser has no states. Each set<a name="line.59"></a>
<FONT color="green">060</FONT>     * of formals requires a different internal node type, which is responsible for<a name="line.60"></a>
<FONT color="green">061</FONT>     * interpreting the list of tokens it receives. This is sufficient for the<a name="line.61"></a>
<FONT color="green">062</FONT>     * current grammar, but it has several annoying properties that might inhibit<a name="line.62"></a>
<FONT color="green">063</FONT>     * extension. In particular, parenthesis are always function calls; an<a name="line.63"></a>
<FONT color="green">064</FONT>     * algebraic or filter grammar would not only require a node type, but must<a name="line.64"></a>
<FONT color="green">065</FONT>     * also work around the internals of this parser.<a name="line.65"></a>
<FONT color="green">066</FONT>     *<a name="line.66"></a>
<FONT color="green">067</FONT>     * For most other cases, adding classes to the hierarchy- particularly by<a name="line.67"></a>
<FONT color="green">068</FONT>     * extending JoinRecordReader and MultiFilterRecordReader- is fairly<a name="line.68"></a>
<FONT color="green">069</FONT>     * straightforward. One need only override the relevant method(s) (usually only<a name="line.69"></a>
<FONT color="green">070</FONT>     * {@link CompositeRecordReader#combine}) and include a property to map its<a name="line.70"></a>
<FONT color="green">071</FONT>     * value to an identifier in the parser.<a name="line.71"></a>
<FONT color="green">072</FONT>     */<a name="line.72"></a>
<FONT color="green">073</FONT>    @InterfaceAudience.Public<a name="line.73"></a>
<FONT color="green">074</FONT>    @InterfaceStability.Evolving<a name="line.74"></a>
<FONT color="green">075</FONT>    public class Parser {<a name="line.75"></a>
<FONT color="green">076</FONT>      @InterfaceAudience.Public<a name="line.76"></a>
<FONT color="green">077</FONT>      @InterfaceStability.Evolving<a name="line.77"></a>
<FONT color="green">078</FONT>      public enum TType { CIF, IDENT, COMMA, LPAREN, RPAREN, QUOT, NUM, }<a name="line.78"></a>
<FONT color="green">079</FONT>    <a name="line.79"></a>
<FONT color="green">080</FONT>      /**<a name="line.80"></a>
<FONT color="green">081</FONT>       * Tagged-union type for tokens from the join expression.<a name="line.81"></a>
<FONT color="green">082</FONT>       * @see Parser.TType<a name="line.82"></a>
<FONT color="green">083</FONT>       */<a name="line.83"></a>
<FONT color="green">084</FONT>      @InterfaceAudience.Public<a name="line.84"></a>
<FONT color="green">085</FONT>      @InterfaceStability.Evolving<a name="line.85"></a>
<FONT color="green">086</FONT>      public static class Token {<a name="line.86"></a>
<FONT color="green">087</FONT>    <a name="line.87"></a>
<FONT color="green">088</FONT>        private TType type;<a name="line.88"></a>
<FONT color="green">089</FONT>    <a name="line.89"></a>
<FONT color="green">090</FONT>        Token(TType type) {<a name="line.90"></a>
<FONT color="green">091</FONT>          this.type = type;<a name="line.91"></a>
<FONT color="green">092</FONT>        }<a name="line.92"></a>
<FONT color="green">093</FONT>    <a name="line.93"></a>
<FONT color="green">094</FONT>        public TType getType() { return type; }<a name="line.94"></a>
<FONT color="green">095</FONT>        <a name="line.95"></a>
<FONT color="green">096</FONT>        public Node getNode() throws IOException {<a name="line.96"></a>
<FONT color="green">097</FONT>          throw new IOException("Expected nodetype");<a name="line.97"></a>
<FONT color="green">098</FONT>        }<a name="line.98"></a>
<FONT color="green">099</FONT>        <a name="line.99"></a>
<FONT color="green">100</FONT>        public double getNum() throws IOException {<a name="line.100"></a>
<FONT color="green">101</FONT>          throw new IOException("Expected numtype");<a name="line.101"></a>
<FONT color="green">102</FONT>        }<a name="line.102"></a>
<FONT color="green">103</FONT>        <a name="line.103"></a>
<FONT color="green">104</FONT>        public String getStr() throws IOException {<a name="line.104"></a>
<FONT color="green">105</FONT>          throw new IOException("Expected strtype");<a name="line.105"></a>
<FONT color="green">106</FONT>        }<a name="line.106"></a>
<FONT color="green">107</FONT>      }<a name="line.107"></a>
<FONT color="green">108</FONT>    <a name="line.108"></a>
<FONT color="green">109</FONT>      @InterfaceAudience.Public<a name="line.109"></a>
<FONT color="green">110</FONT>      @InterfaceStability.Evolving<a name="line.110"></a>
<FONT color="green">111</FONT>      public static class NumToken extends Token {<a name="line.111"></a>
<FONT color="green">112</FONT>        private double num;<a name="line.112"></a>
<FONT color="green">113</FONT>        public NumToken(double num) {<a name="line.113"></a>
<FONT color="green">114</FONT>          super(TType.NUM);<a name="line.114"></a>
<FONT color="green">115</FONT>          this.num = num;<a name="line.115"></a>
<FONT color="green">116</FONT>        }<a name="line.116"></a>
<FONT color="green">117</FONT>        public double getNum() { return num; }<a name="line.117"></a>
<FONT color="green">118</FONT>      }<a name="line.118"></a>
<FONT color="green">119</FONT>    <a name="line.119"></a>
<FONT color="green">120</FONT>      @InterfaceAudience.Public<a name="line.120"></a>
<FONT color="green">121</FONT>      @InterfaceStability.Evolving<a name="line.121"></a>
<FONT color="green">122</FONT>      public static class NodeToken extends Token {<a name="line.122"></a>
<FONT color="green">123</FONT>        private Node node;<a name="line.123"></a>
<FONT color="green">124</FONT>        NodeToken(Node node) {<a name="line.124"></a>
<FONT color="green">125</FONT>          super(TType.CIF);<a name="line.125"></a>
<FONT color="green">126</FONT>          this.node = node;<a name="line.126"></a>
<FONT color="green">127</FONT>        }<a name="line.127"></a>
<FONT color="green">128</FONT>        public Node getNode() {<a name="line.128"></a>
<FONT color="green">129</FONT>          return node;<a name="line.129"></a>
<FONT color="green">130</FONT>        }<a name="line.130"></a>
<FONT color="green">131</FONT>      }<a name="line.131"></a>
<FONT color="green">132</FONT>    <a name="line.132"></a>
<FONT color="green">133</FONT>      @InterfaceAudience.Public<a name="line.133"></a>
<FONT color="green">134</FONT>      @InterfaceStability.Evolving<a name="line.134"></a>
<FONT color="green">135</FONT>      public static class StrToken extends Token {<a name="line.135"></a>
<FONT color="green">136</FONT>        private String str;<a name="line.136"></a>
<FONT color="green">137</FONT>        public StrToken(TType type, String str) {<a name="line.137"></a>
<FONT color="green">138</FONT>          super(type);<a name="line.138"></a>
<FONT color="green">139</FONT>          this.str = str;<a name="line.139"></a>
<FONT color="green">140</FONT>        }<a name="line.140"></a>
<FONT color="green">141</FONT>        public String getStr() {<a name="line.141"></a>
<FONT color="green">142</FONT>          return str;<a name="line.142"></a>
<FONT color="green">143</FONT>        }<a name="line.143"></a>
<FONT color="green">144</FONT>      }<a name="line.144"></a>
<FONT color="green">145</FONT>    <a name="line.145"></a>
<FONT color="green">146</FONT>      /**<a name="line.146"></a>
<FONT color="green">147</FONT>       * Simple lexer wrapping a StreamTokenizer.<a name="line.147"></a>
<FONT color="green">148</FONT>       * This encapsulates the creation of tagged-union Tokens and initializes the<a name="line.148"></a>
<FONT color="green">149</FONT>       * SteamTokenizer.<a name="line.149"></a>
<FONT color="green">150</FONT>       */<a name="line.150"></a>
<FONT color="green">151</FONT>      private static class Lexer {<a name="line.151"></a>
<FONT color="green">152</FONT>    <a name="line.152"></a>
<FONT color="green">153</FONT>        private StreamTokenizer tok;<a name="line.153"></a>
<FONT color="green">154</FONT>    <a name="line.154"></a>
<FONT color="green">155</FONT>        Lexer(String s) {<a name="line.155"></a>
<FONT color="green">156</FONT>          tok = new StreamTokenizer(new CharArrayReader(s.toCharArray()));<a name="line.156"></a>
<FONT color="green">157</FONT>          tok.quoteChar('"');<a name="line.157"></a>
<FONT color="green">158</FONT>          tok.parseNumbers();<a name="line.158"></a>
<FONT color="green">159</FONT>          tok.ordinaryChar(',');<a name="line.159"></a>
<FONT color="green">160</FONT>          tok.ordinaryChar('(');<a name="line.160"></a>
<FONT color="green">161</FONT>          tok.ordinaryChar(')');<a name="line.161"></a>
<FONT color="green">162</FONT>          tok.wordChars('$','$');<a name="line.162"></a>
<FONT color="green">163</FONT>          tok.wordChars('_','_');<a name="line.163"></a>
<FONT color="green">164</FONT>        }<a name="line.164"></a>
<FONT color="green">165</FONT>    <a name="line.165"></a>
<FONT color="green">166</FONT>        Token next() throws IOException {<a name="line.166"></a>
<FONT color="green">167</FONT>          int type = tok.nextToken();<a name="line.167"></a>
<FONT color="green">168</FONT>          switch (type) {<a name="line.168"></a>
<FONT color="green">169</FONT>            case StreamTokenizer.TT_EOF:<a name="line.169"></a>
<FONT color="green">170</FONT>            case StreamTokenizer.TT_EOL:<a name="line.170"></a>
<FONT color="green">171</FONT>              return null;<a name="line.171"></a>
<FONT color="green">172</FONT>            case StreamTokenizer.TT_NUMBER:<a name="line.172"></a>
<FONT color="green">173</FONT>              return new NumToken(tok.nval);<a name="line.173"></a>
<FONT color="green">174</FONT>            case StreamTokenizer.TT_WORD:<a name="line.174"></a>
<FONT color="green">175</FONT>              return new StrToken(TType.IDENT, tok.sval);<a name="line.175"></a>
<FONT color="green">176</FONT>            case '"':<a name="line.176"></a>
<FONT color="green">177</FONT>              return new StrToken(TType.QUOT, tok.sval);<a name="line.177"></a>
<FONT color="green">178</FONT>            default:<a name="line.178"></a>
<FONT color="green">179</FONT>              switch (type) {<a name="line.179"></a>
<FONT color="green">180</FONT>                case ',':<a name="line.180"></a>
<FONT color="green">181</FONT>                  return new Token(TType.COMMA);<a name="line.181"></a>
<FONT color="green">182</FONT>                case '(':<a name="line.182"></a>
<FONT color="green">183</FONT>                  return new Token(TType.LPAREN);<a name="line.183"></a>
<FONT color="green">184</FONT>                case ')':<a name="line.184"></a>
<FONT color="green">185</FONT>                  return new Token(TType.RPAREN);<a name="line.185"></a>
<FONT color="green">186</FONT>                default:<a name="line.186"></a>
<FONT color="green">187</FONT>                  throw new IOException("Unexpected: " + type);<a name="line.187"></a>
<FONT color="green">188</FONT>              }<a name="line.188"></a>
<FONT color="green">189</FONT>          }<a name="line.189"></a>
<FONT color="green">190</FONT>        }<a name="line.190"></a>
<FONT color="green">191</FONT>      }<a name="line.191"></a>
<FONT color="green">192</FONT>    <a name="line.192"></a>
<FONT color="green">193</FONT>    @SuppressWarnings("unchecked")<a name="line.193"></a>
<FONT color="green">194</FONT>    @InterfaceAudience.Public<a name="line.194"></a>
<FONT color="green">195</FONT>    @InterfaceStability.Evolving<a name="line.195"></a>
<FONT color="green">196</FONT>    public abstract static class Node extends ComposableInputFormat {<a name="line.196"></a>
<FONT color="green">197</FONT>        /**<a name="line.197"></a>
<FONT color="green">198</FONT>         * Return the node type registered for the particular identifier.<a name="line.198"></a>
<FONT color="green">199</FONT>         * By default, this is a CNode for any composite node and a WNode<a name="line.199"></a>
<FONT color="green">200</FONT>         * for &amp;quot;wrapped&amp;quot; nodes. User nodes will likely be composite<a name="line.200"></a>
<FONT color="green">201</FONT>         * nodes.<a name="line.201"></a>
<FONT color="green">202</FONT>         * @see #addIdentifier(java.lang.String, java.lang.Class[], java.lang.Class, java.lang.Class)<a name="line.202"></a>
<FONT color="green">203</FONT>         * @see CompositeInputFormat#setFormat(org.apache.hadoop.mapred.JobConf)<a name="line.203"></a>
<FONT color="green">204</FONT>         */<a name="line.204"></a>
<FONT color="green">205</FONT>        static Node forIdent(String ident) throws IOException {<a name="line.205"></a>
<FONT color="green">206</FONT>          try {<a name="line.206"></a>
<FONT color="green">207</FONT>            if (!nodeCstrMap.containsKey(ident)) {<a name="line.207"></a>
<FONT color="green">208</FONT>              throw new IOException("No nodetype for " + ident);<a name="line.208"></a>
<FONT color="green">209</FONT>            }<a name="line.209"></a>
<FONT color="green">210</FONT>            return nodeCstrMap.get(ident).newInstance(ident);<a name="line.210"></a>
<FONT color="green">211</FONT>          } catch (IllegalAccessException e) {<a name="line.211"></a>
<FONT color="green">212</FONT>            throw new IOException(e);<a name="line.212"></a>
<FONT color="green">213</FONT>          } catch (InstantiationException e) {<a name="line.213"></a>
<FONT color="green">214</FONT>            throw new IOException(e);<a name="line.214"></a>
<FONT color="green">215</FONT>          } catch (InvocationTargetException e) {<a name="line.215"></a>
<FONT color="green">216</FONT>            throw new IOException(e);<a name="line.216"></a>
<FONT color="green">217</FONT>          }<a name="line.217"></a>
<FONT color="green">218</FONT>        }<a name="line.218"></a>
<FONT color="green">219</FONT>    <a name="line.219"></a>
<FONT color="green">220</FONT>        private static final Class&lt;?&gt;[] ncstrSig = { String.class };<a name="line.220"></a>
<FONT color="green">221</FONT>        private static final<a name="line.221"></a>
<FONT color="green">222</FONT>            Map&lt;String,Constructor&lt;? extends Node&gt;&gt; nodeCstrMap =<a name="line.222"></a>
<FONT color="green">223</FONT>            new HashMap&lt;String,Constructor&lt;? extends Node&gt;&gt;();<a name="line.223"></a>
<FONT color="green">224</FONT>        protected static final Map&lt;String,Constructor&lt;? extends <a name="line.224"></a>
<FONT color="green">225</FONT>            ComposableRecordReader&gt;&gt; rrCstrMap =<a name="line.225"></a>
<FONT color="green">226</FONT>            new HashMap&lt;String,Constructor&lt;? extends ComposableRecordReader&gt;&gt;();<a name="line.226"></a>
<FONT color="green">227</FONT>    <a name="line.227"></a>
<FONT color="green">228</FONT>        /**<a name="line.228"></a>
<FONT color="green">229</FONT>         * For a given identifier, add a mapping to the nodetype for the parse<a name="line.229"></a>
<FONT color="green">230</FONT>         * tree and to the ComposableRecordReader to be created, including the<a name="line.230"></a>
<FONT color="green">231</FONT>         * formals required to invoke the constructor.<a name="line.231"></a>
<FONT color="green">232</FONT>         * The nodetype and constructor signature should be filled in from the<a name="line.232"></a>
<FONT color="green">233</FONT>         * child node.<a name="line.233"></a>
<FONT color="green">234</FONT>         */<a name="line.234"></a>
<FONT color="green">235</FONT>        protected static void addIdentifier(String ident, Class&lt;?&gt;[] mcstrSig,<a name="line.235"></a>
<FONT color="green">236</FONT>                                  Class&lt;? extends Node&gt; nodetype,<a name="line.236"></a>
<FONT color="green">237</FONT>                                  Class&lt;? extends ComposableRecordReader&gt; cl)<a name="line.237"></a>
<FONT color="green">238</FONT>            throws NoSuchMethodException {<a name="line.238"></a>
<FONT color="green">239</FONT>          Constructor&lt;? extends Node&gt; ncstr =<a name="line.239"></a>
<FONT color="green">240</FONT>            nodetype.getDeclaredConstructor(ncstrSig);<a name="line.240"></a>
<FONT color="green">241</FONT>          ncstr.setAccessible(true);<a name="line.241"></a>
<FONT color="green">242</FONT>          nodeCstrMap.put(ident, ncstr);<a name="line.242"></a>
<FONT color="green">243</FONT>          Constructor&lt;? extends ComposableRecordReader&gt; mcstr =<a name="line.243"></a>
<FONT color="green">244</FONT>            cl.getDeclaredConstructor(mcstrSig);<a name="line.244"></a>
<FONT color="green">245</FONT>          mcstr.setAccessible(true);<a name="line.245"></a>
<FONT color="green">246</FONT>          rrCstrMap.put(ident, mcstr);<a name="line.246"></a>
<FONT color="green">247</FONT>        }<a name="line.247"></a>
<FONT color="green">248</FONT>    <a name="line.248"></a>
<FONT color="green">249</FONT>        // inst<a name="line.249"></a>
<FONT color="green">250</FONT>        protected int id = -1;<a name="line.250"></a>
<FONT color="green">251</FONT>        protected String ident;<a name="line.251"></a>
<FONT color="green">252</FONT>        protected Class&lt;? extends WritableComparator&gt; cmpcl;<a name="line.252"></a>
<FONT color="green">253</FONT>    <a name="line.253"></a>
<FONT color="green">254</FONT>        protected Node(String ident) {<a name="line.254"></a>
<FONT color="green">255</FONT>          this.ident = ident;<a name="line.255"></a>
<FONT color="green">256</FONT>        }<a name="line.256"></a>
<FONT color="green">257</FONT>    <a name="line.257"></a>
<FONT color="green">258</FONT>        protected void setID(int id) {<a name="line.258"></a>
<FONT color="green">259</FONT>          this.id = id;<a name="line.259"></a>
<FONT color="green">260</FONT>        }<a name="line.260"></a>
<FONT color="green">261</FONT>    <a name="line.261"></a>
<FONT color="green">262</FONT>        protected void setKeyComparator(<a name="line.262"></a>
<FONT color="green">263</FONT>            Class&lt;? extends WritableComparator&gt; cmpcl) {<a name="line.263"></a>
<FONT color="green">264</FONT>          this.cmpcl = cmpcl;<a name="line.264"></a>
<FONT color="green">265</FONT>        }<a name="line.265"></a>
<FONT color="green">266</FONT>        abstract void parse(List&lt;Token&gt; args, Configuration conf) <a name="line.266"></a>
<FONT color="green">267</FONT>            throws IOException;<a name="line.267"></a>
<FONT color="green">268</FONT>      }<a name="line.268"></a>
<FONT color="green">269</FONT>    <a name="line.269"></a>
<FONT color="green">270</FONT>      /**<a name="line.270"></a>
<FONT color="green">271</FONT>       * Nodetype in the parse tree for &amp;quot;wrapped&amp;quot; InputFormats.<a name="line.271"></a>
<FONT color="green">272</FONT>       */<a name="line.272"></a>
<FONT color="green">273</FONT>      static class WNode extends Node {<a name="line.273"></a>
<FONT color="green">274</FONT>        private static final Class&lt;?&gt;[] cstrSig =<a name="line.274"></a>
<FONT color="green">275</FONT>          { Integer.TYPE, RecordReader.class, Class.class };<a name="line.275"></a>
<FONT color="green">276</FONT>    <a name="line.276"></a>
<FONT color="green">277</FONT>        @SuppressWarnings("unchecked")<a name="line.277"></a>
<FONT color="green">278</FONT>            static void addIdentifier(String ident,<a name="line.278"></a>
<FONT color="green">279</FONT>                                  Class&lt;? extends ComposableRecordReader&gt; cl)<a name="line.279"></a>
<FONT color="green">280</FONT>            throws NoSuchMethodException {<a name="line.280"></a>
<FONT color="green">281</FONT>          Node.addIdentifier(ident, cstrSig, WNode.class, cl);<a name="line.281"></a>
<FONT color="green">282</FONT>        }<a name="line.282"></a>
<FONT color="green">283</FONT>    <a name="line.283"></a>
<FONT color="green">284</FONT>        private String indir;<a name="line.284"></a>
<FONT color="green">285</FONT>        private InputFormat&lt;?, ?&gt; inf;<a name="line.285"></a>
<FONT color="green">286</FONT>    <a name="line.286"></a>
<FONT color="green">287</FONT>        public WNode(String ident) {<a name="line.287"></a>
<FONT color="green">288</FONT>          super(ident);<a name="line.288"></a>
<FONT color="green">289</FONT>        }<a name="line.289"></a>
<FONT color="green">290</FONT>    <a name="line.290"></a>
<FONT color="green">291</FONT>        /**<a name="line.291"></a>
<FONT color="green">292</FONT>         * Let the first actual define the InputFormat and the second define<a name="line.292"></a>
<FONT color="green">293</FONT>         * the &lt;tt&gt;mapred.input.dir&lt;/tt&gt; property.<a name="line.293"></a>
<FONT color="green">294</FONT>         */<a name="line.294"></a>
<FONT color="green">295</FONT>        @Override<a name="line.295"></a>
<FONT color="green">296</FONT>        public void parse(List&lt;Token&gt; ll, Configuration conf) throws IOException {<a name="line.296"></a>
<FONT color="green">297</FONT>          StringBuilder sb = new StringBuilder();<a name="line.297"></a>
<FONT color="green">298</FONT>          Iterator&lt;Token&gt; i = ll.iterator();<a name="line.298"></a>
<FONT color="green">299</FONT>          while (i.hasNext()) {<a name="line.299"></a>
<FONT color="green">300</FONT>            Token t = i.next();<a name="line.300"></a>
<FONT color="green">301</FONT>            if (TType.COMMA.equals(t.getType())) {<a name="line.301"></a>
<FONT color="green">302</FONT>              try {<a name="line.302"></a>
<FONT color="green">303</FONT>                    inf = (InputFormat&lt;?, ?&gt;)ReflectionUtils.newInstance(<a name="line.303"></a>
<FONT color="green">304</FONT>                                    conf.getClassByName(sb.toString()), conf);<a name="line.304"></a>
<FONT color="green">305</FONT>              } catch (ClassNotFoundException e) {<a name="line.305"></a>
<FONT color="green">306</FONT>                throw new IOException(e);<a name="line.306"></a>
<FONT color="green">307</FONT>              } catch (IllegalArgumentException e) {<a name="line.307"></a>
<FONT color="green">308</FONT>                throw new IOException(e);<a name="line.308"></a>
<FONT color="green">309</FONT>              }<a name="line.309"></a>
<FONT color="green">310</FONT>              break;<a name="line.310"></a>
<FONT color="green">311</FONT>            }<a name="line.311"></a>
<FONT color="green">312</FONT>            sb.append(t.getStr());<a name="line.312"></a>
<FONT color="green">313</FONT>          }<a name="line.313"></a>
<FONT color="green">314</FONT>          if (!i.hasNext()) {<a name="line.314"></a>
<FONT color="green">315</FONT>            throw new IOException("Parse error");<a name="line.315"></a>
<FONT color="green">316</FONT>          }<a name="line.316"></a>
<FONT color="green">317</FONT>          Token t = i.next();<a name="line.317"></a>
<FONT color="green">318</FONT>          if (!TType.QUOT.equals(t.getType())) {<a name="line.318"></a>
<FONT color="green">319</FONT>            throw new IOException("Expected quoted string");<a name="line.319"></a>
<FONT color="green">320</FONT>          }<a name="line.320"></a>
<FONT color="green">321</FONT>          indir = t.getStr();<a name="line.321"></a>
<FONT color="green">322</FONT>          // no check for ll.isEmpty() to permit extension<a name="line.322"></a>
<FONT color="green">323</FONT>        }<a name="line.323"></a>
<FONT color="green">324</FONT>    <a name="line.324"></a>
<FONT color="green">325</FONT>        private Configuration getConf(Configuration jconf) throws IOException {<a name="line.325"></a>
<FONT color="green">326</FONT>          Job job = new Job(jconf);<a name="line.326"></a>
<FONT color="green">327</FONT>          FileInputFormat.setInputPaths(job, indir);<a name="line.327"></a>
<FONT color="green">328</FONT>          return job.getConfiguration();<a name="line.328"></a>
<FONT color="green">329</FONT>        }<a name="line.329"></a>
<FONT color="green">330</FONT>        <a name="line.330"></a>
<FONT color="green">331</FONT>        public List&lt;InputSplit&gt; getSplits(JobContext context)<a name="line.331"></a>
<FONT color="green">332</FONT>            throws IOException, InterruptedException {<a name="line.332"></a>
<FONT color="green">333</FONT>          return inf.getSplits(<a name="line.333"></a>
<FONT color="green">334</FONT>                     new JobContextImpl(getConf(context.getConfiguration()), <a name="line.334"></a>
<FONT color="green">335</FONT>                                        context.getJobID()));<a name="line.335"></a>
<FONT color="green">336</FONT>        }<a name="line.336"></a>
<FONT color="green">337</FONT>    <a name="line.337"></a>
<FONT color="green">338</FONT>        public ComposableRecordReader&lt;?, ?&gt; createRecordReader(InputSplit split, <a name="line.338"></a>
<FONT color="green">339</FONT>            TaskAttemptContext taskContext) <a name="line.339"></a>
<FONT color="green">340</FONT>            throws IOException, InterruptedException {<a name="line.340"></a>
<FONT color="green">341</FONT>          try {<a name="line.341"></a>
<FONT color="green">342</FONT>            if (!rrCstrMap.containsKey(ident)) {<a name="line.342"></a>
<FONT color="green">343</FONT>              throw new IOException("No RecordReader for " + ident);<a name="line.343"></a>
<FONT color="green">344</FONT>            }<a name="line.344"></a>
<FONT color="green">345</FONT>            Configuration conf = getConf(taskContext.getConfiguration());<a name="line.345"></a>
<FONT color="green">346</FONT>            TaskAttemptContext context = <a name="line.346"></a>
<FONT color="green">347</FONT>              new TaskAttemptContextImpl(conf, <a name="line.347"></a>
<FONT color="green">348</FONT>                  TaskAttemptID.forName(conf.get(MRJobConfig.TASK_ATTEMPT_ID)), <a name="line.348"></a>
<FONT color="green">349</FONT>                  new WrappedStatusReporter(taskContext));<a name="line.349"></a>
<FONT color="green">350</FONT>            return rrCstrMap.get(ident).newInstance(id,<a name="line.350"></a>
<FONT color="green">351</FONT>                inf.createRecordReader(split, context), cmpcl);<a name="line.351"></a>
<FONT color="green">352</FONT>          } catch (IllegalAccessException e) {<a name="line.352"></a>
<FONT color="green">353</FONT>            throw new IOException(e);<a name="line.353"></a>
<FONT color="green">354</FONT>          } catch (InstantiationException e) {<a name="line.354"></a>
<FONT color="green">355</FONT>            throw new IOException(e);<a name="line.355"></a>
<FONT color="green">356</FONT>          } catch (InvocationTargetException e) {<a name="line.356"></a>
<FONT color="green">357</FONT>            throw new IOException(e);<a name="line.357"></a>
<FONT color="green">358</FONT>          }<a name="line.358"></a>
<FONT color="green">359</FONT>        }<a name="line.359"></a>
<FONT color="green">360</FONT>    <a name="line.360"></a>
<FONT color="green">361</FONT>        public String toString() {<a name="line.361"></a>
<FONT color="green">362</FONT>          return ident + "(" + inf.getClass().getName() + ",\"" + indir + "\")";<a name="line.362"></a>
<FONT color="green">363</FONT>        }<a name="line.363"></a>
<FONT color="green">364</FONT>      }<a name="line.364"></a>
<FONT color="green">365</FONT>    <a name="line.365"></a>
<FONT color="green">366</FONT>      private static class WrappedStatusReporter extends StatusReporter {<a name="line.366"></a>
<FONT color="green">367</FONT>    <a name="line.367"></a>
<FONT color="green">368</FONT>        TaskAttemptContext context;<a name="line.368"></a>
<FONT color="green">369</FONT>        <a name="line.369"></a>
<FONT color="green">370</FONT>        public WrappedStatusReporter(TaskAttemptContext context) {<a name="line.370"></a>
<FONT color="green">371</FONT>          this.context = context; <a name="line.371"></a>
<FONT color="green">372</FONT>        }<a name="line.372"></a>
<FONT color="green">373</FONT>        @Override<a name="line.373"></a>
<FONT color="green">374</FONT>        public Counter getCounter(Enum&lt;?&gt; name) {<a name="line.374"></a>
<FONT color="green">375</FONT>          return context.getCounter(name);<a name="line.375"></a>
<FONT color="green">376</FONT>        }<a name="line.376"></a>
<FONT color="green">377</FONT>    <a name="line.377"></a>
<FONT color="green">378</FONT>        @Override<a name="line.378"></a>
<FONT color="green">379</FONT>        public Counter getCounter(String group, String name) {<a name="line.379"></a>
<FONT color="green">380</FONT>          return context.getCounter(group, name);<a name="line.380"></a>
<FONT color="green">381</FONT>        }<a name="line.381"></a>
<FONT color="green">382</FONT>    <a name="line.382"></a>
<FONT color="green">383</FONT>        @Override<a name="line.383"></a>
<FONT color="green">384</FONT>        public void progress() {<a name="line.384"></a>
<FONT color="green">385</FONT>          context.progress();<a name="line.385"></a>
<FONT color="green">386</FONT>        }<a name="line.386"></a>
<FONT color="green">387</FONT>    <a name="line.387"></a>
<FONT color="green">388</FONT>        @Override<a name="line.388"></a>
<FONT color="green">389</FONT>        public float getProgress() {<a name="line.389"></a>
<FONT color="green">390</FONT>          return context.getProgress();<a name="line.390"></a>
<FONT color="green">391</FONT>        }<a name="line.391"></a>
<FONT color="green">392</FONT>        <a name="line.392"></a>
<FONT color="green">393</FONT>        @Override<a name="line.393"></a>
<FONT color="green">394</FONT>        public void setStatus(String status) {<a name="line.394"></a>
<FONT color="green">395</FONT>          context.setStatus(status);<a name="line.395"></a>
<FONT color="green">396</FONT>        }<a name="line.396"></a>
<FONT color="green">397</FONT>      }<a name="line.397"></a>
<FONT color="green">398</FONT>    <a name="line.398"></a>
<FONT color="green">399</FONT>      /**<a name="line.399"></a>
<FONT color="green">400</FONT>       * Internal nodetype for &amp;quot;composite&amp;quot; InputFormats.<a name="line.400"></a>
<FONT color="green">401</FONT>       */<a name="line.401"></a>
<FONT color="green">402</FONT>      static class CNode extends Node {<a name="line.402"></a>
<FONT color="green">403</FONT>    <a name="line.403"></a>
<FONT color="green">404</FONT>        private static final Class&lt;?&gt;[] cstrSig =<a name="line.404"></a>
<FONT color="green">405</FONT>          { Integer.TYPE, Configuration.class, Integer.TYPE, Class.class };<a name="line.405"></a>
<FONT color="green">406</FONT>    <a name="line.406"></a>
<FONT color="green">407</FONT>        @SuppressWarnings("unchecked")<a name="line.407"></a>
<FONT color="green">408</FONT>            static void addIdentifier(String ident,<a name="line.408"></a>
<FONT color="green">409</FONT>                                  Class&lt;? extends ComposableRecordReader&gt; cl)<a name="line.409"></a>
<FONT color="green">410</FONT>            throws NoSuchMethodException {<a name="line.410"></a>
<FONT color="green">411</FONT>          Node.addIdentifier(ident, cstrSig, CNode.class, cl);<a name="line.411"></a>
<FONT color="green">412</FONT>        }<a name="line.412"></a>
<FONT color="green">413</FONT>    <a name="line.413"></a>
<FONT color="green">414</FONT>        // inst<a name="line.414"></a>
<FONT color="green">415</FONT>        private ArrayList&lt;Node&gt; kids = new ArrayList&lt;Node&gt;();<a name="line.415"></a>
<FONT color="green">416</FONT>    <a name="line.416"></a>
<FONT color="green">417</FONT>        public CNode(String ident) {<a name="line.417"></a>
<FONT color="green">418</FONT>          super(ident);<a name="line.418"></a>
<FONT color="green">419</FONT>        }<a name="line.419"></a>
<FONT color="green">420</FONT>    <a name="line.420"></a>
<FONT color="green">421</FONT>        @Override<a name="line.421"></a>
<FONT color="green">422</FONT>        public void setKeyComparator(Class&lt;? extends WritableComparator&gt; cmpcl) {<a name="line.422"></a>
<FONT color="green">423</FONT>          super.setKeyComparator(cmpcl);<a name="line.423"></a>
<FONT color="green">424</FONT>          for (Node n : kids) {<a name="line.424"></a>
<FONT color="green">425</FONT>            n.setKeyComparator(cmpcl);<a name="line.425"></a>
<FONT color="green">426</FONT>          }<a name="line.426"></a>
<FONT color="green">427</FONT>        }<a name="line.427"></a>
<FONT color="green">428</FONT>    <a name="line.428"></a>
<FONT color="green">429</FONT>        /**<a name="line.429"></a>
<FONT color="green">430</FONT>         * Combine InputSplits from child InputFormats into a<a name="line.430"></a>
<FONT color="green">431</FONT>         * {@link CompositeInputSplit}.<a name="line.431"></a>
<FONT color="green">432</FONT>         */<a name="line.432"></a>
<FONT color="green">433</FONT>        @SuppressWarnings("unchecked")<a name="line.433"></a>
<FONT color="green">434</FONT>            public List&lt;InputSplit&gt; getSplits(JobContext job)<a name="line.434"></a>
<FONT color="green">435</FONT>            throws IOException, InterruptedException {<a name="line.435"></a>
<FONT color="green">436</FONT>          List&lt;List&lt;InputSplit&gt;&gt; splits = <a name="line.436"></a>
<FONT color="green">437</FONT>            new ArrayList&lt;List&lt;InputSplit&gt;&gt;(kids.size());<a name="line.437"></a>
<FONT color="green">438</FONT>          for (int i = 0; i &lt; kids.size(); ++i) {<a name="line.438"></a>
<FONT color="green">439</FONT>            List&lt;InputSplit&gt; tmp = kids.get(i).getSplits(job);<a name="line.439"></a>
<FONT color="green">440</FONT>            if (null == tmp) {<a name="line.440"></a>
<FONT color="green">441</FONT>              throw new IOException("Error gathering splits from child RReader");<a name="line.441"></a>
<FONT color="green">442</FONT>            }<a name="line.442"></a>
<FONT color="green">443</FONT>            if (i &gt; 0 &amp;&amp; splits.get(i-1).size() != tmp.size()) {<a name="line.443"></a>
<FONT color="green">444</FONT>              throw new IOException("Inconsistent split cardinality from child " +<a name="line.444"></a>
<FONT color="green">445</FONT>                  i + " (" + splits.get(i-1).size() + "/" + tmp.size() + ")");<a name="line.445"></a>
<FONT color="green">446</FONT>            }<a name="line.446"></a>
<FONT color="green">447</FONT>            splits.add(i, tmp);<a name="line.447"></a>
<FONT color="green">448</FONT>          }<a name="line.448"></a>
<FONT color="green">449</FONT>          final int size = splits.get(0).size();<a name="line.449"></a>
<FONT color="green">450</FONT>          List&lt;InputSplit&gt; ret = new ArrayList&lt;InputSplit&gt;();<a name="line.450"></a>
<FONT color="green">451</FONT>          for (int i = 0; i &lt; size; ++i) {<a name="line.451"></a>
<FONT color="green">452</FONT>            CompositeInputSplit split = new CompositeInputSplit(splits.size());<a name="line.452"></a>
<FONT color="green">453</FONT>            for (int j = 0; j &lt; splits.size(); ++j) {<a name="line.453"></a>
<FONT color="green">454</FONT>              split.add(splits.get(j).get(i));<a name="line.454"></a>
<FONT color="green">455</FONT>            }<a name="line.455"></a>
<FONT color="green">456</FONT>            ret.add(split);<a name="line.456"></a>
<FONT color="green">457</FONT>          }<a name="line.457"></a>
<FONT color="green">458</FONT>          return ret;<a name="line.458"></a>
<FONT color="green">459</FONT>        }<a name="line.459"></a>
<FONT color="green">460</FONT>    <a name="line.460"></a>
<FONT color="green">461</FONT>        @SuppressWarnings("unchecked") // child types unknowable<a name="line.461"></a>
<FONT color="green">462</FONT>        public ComposableRecordReader <a name="line.462"></a>
<FONT color="green">463</FONT>            createRecordReader(InputSplit split, TaskAttemptContext taskContext) <a name="line.463"></a>
<FONT color="green">464</FONT>            throws IOException, InterruptedException {<a name="line.464"></a>
<FONT color="green">465</FONT>          if (!(split instanceof CompositeInputSplit)) {<a name="line.465"></a>
<FONT color="green">466</FONT>            throw new IOException("Invalid split type:" +<a name="line.466"></a>
<FONT color="green">467</FONT>                                  split.getClass().getName());<a name="line.467"></a>
<FONT color="green">468</FONT>          }<a name="line.468"></a>
<FONT color="green">469</FONT>          final CompositeInputSplit spl = (CompositeInputSplit)split;<a name="line.469"></a>
<FONT color="green">470</FONT>          final int capacity = kids.size();<a name="line.470"></a>
<FONT color="green">471</FONT>          CompositeRecordReader ret = null;<a name="line.471"></a>
<FONT color="green">472</FONT>          try {<a name="line.472"></a>
<FONT color="green">473</FONT>            if (!rrCstrMap.containsKey(ident)) {<a name="line.473"></a>
<FONT color="green">474</FONT>              throw new IOException("No RecordReader for " + ident);<a name="line.474"></a>
<FONT color="green">475</FONT>            }<a name="line.475"></a>
<FONT color="green">476</FONT>            ret = (CompositeRecordReader)rrCstrMap.get(ident).<a name="line.476"></a>
<FONT color="green">477</FONT>              newInstance(id, taskContext.getConfiguration(), capacity, cmpcl);<a name="line.477"></a>
<FONT color="green">478</FONT>          } catch (IllegalAccessException e) {<a name="line.478"></a>
<FONT color="green">479</FONT>            throw new IOException(e);<a name="line.479"></a>
<FONT color="green">480</FONT>          } catch (InstantiationException e) {<a name="line.480"></a>
<FONT color="green">481</FONT>            throw new IOException(e);<a name="line.481"></a>
<FONT color="green">482</FONT>          } catch (InvocationTargetException e) {<a name="line.482"></a>
<FONT color="green">483</FONT>            throw new IOException(e);<a name="line.483"></a>
<FONT color="green">484</FONT>          }<a name="line.484"></a>
<FONT color="green">485</FONT>          for (int i = 0; i &lt; capacity; ++i) {<a name="line.485"></a>
<FONT color="green">486</FONT>            ret.add(kids.get(i).createRecordReader(spl.get(i), taskContext));<a name="line.486"></a>
<FONT color="green">487</FONT>          }<a name="line.487"></a>
<FONT color="green">488</FONT>          return (ComposableRecordReader)ret;<a name="line.488"></a>
<FONT color="green">489</FONT>        }<a name="line.489"></a>
<FONT color="green">490</FONT>    <a name="line.490"></a>
<FONT color="green">491</FONT>        /**<a name="line.491"></a>
<FONT color="green">492</FONT>         * Parse a list of comma-separated nodes.<a name="line.492"></a>
<FONT color="green">493</FONT>         */<a name="line.493"></a>
<FONT color="green">494</FONT>        public void parse(List&lt;Token&gt; args, Configuration conf) <a name="line.494"></a>
<FONT color="green">495</FONT>            throws IOException {<a name="line.495"></a>
<FONT color="green">496</FONT>          ListIterator&lt;Token&gt; i = args.listIterator();<a name="line.496"></a>
<FONT color="green">497</FONT>          while (i.hasNext()) {<a name="line.497"></a>
<FONT color="green">498</FONT>            Token t = i.next();<a name="line.498"></a>
<FONT color="green">499</FONT>            t.getNode().setID(i.previousIndex() &gt;&gt; 1);<a name="line.499"></a>
<FONT color="green">500</FONT>            kids.add(t.getNode());<a name="line.500"></a>
<FONT color="green">501</FONT>            if (i.hasNext() &amp;&amp; !TType.COMMA.equals(i.next().getType())) {<a name="line.501"></a>
<FONT color="green">502</FONT>              throw new IOException("Expected ','");<a name="line.502"></a>
<FONT color="green">503</FONT>            }<a name="line.503"></a>
<FONT color="green">504</FONT>          }<a name="line.504"></a>
<FONT color="green">505</FONT>        }<a name="line.505"></a>
<FONT color="green">506</FONT>    <a name="line.506"></a>
<FONT color="green">507</FONT>        public String toString() {<a name="line.507"></a>
<FONT color="green">508</FONT>          StringBuilder sb = new StringBuilder();<a name="line.508"></a>
<FONT color="green">509</FONT>          sb.append(ident + "(");<a name="line.509"></a>
<FONT color="green">510</FONT>          for (Node n : kids) {<a name="line.510"></a>
<FONT color="green">511</FONT>            sb.append(n.toString() + ",");<a name="line.511"></a>
<FONT color="green">512</FONT>          }<a name="line.512"></a>
<FONT color="green">513</FONT>          sb.setCharAt(sb.length() - 1, ')');<a name="line.513"></a>
<FONT color="green">514</FONT>          return sb.toString();<a name="line.514"></a>
<FONT color="green">515</FONT>        }<a name="line.515"></a>
<FONT color="green">516</FONT>      }<a name="line.516"></a>
<FONT color="green">517</FONT>    <a name="line.517"></a>
<FONT color="green">518</FONT>      private static Token reduce(Stack&lt;Token&gt; st, Configuration conf) <a name="line.518"></a>
<FONT color="green">519</FONT>          throws IOException {<a name="line.519"></a>
<FONT color="green">520</FONT>        LinkedList&lt;Token&gt; args = new LinkedList&lt;Token&gt;();<a name="line.520"></a>
<FONT color="green">521</FONT>        while (!st.isEmpty() &amp;&amp; !TType.LPAREN.equals(st.peek().getType())) {<a name="line.521"></a>
<FONT color="green">522</FONT>          args.addFirst(st.pop());<a name="line.522"></a>
<FONT color="green">523</FONT>        }<a name="line.523"></a>
<FONT color="green">524</FONT>        if (st.isEmpty()) {<a name="line.524"></a>
<FONT color="green">525</FONT>          throw new IOException("Unmatched ')'");<a name="line.525"></a>
<FONT color="green">526</FONT>        }<a name="line.526"></a>
<FONT color="green">527</FONT>        st.pop();<a name="line.527"></a>
<FONT color="green">528</FONT>        if (st.isEmpty() || !TType.IDENT.equals(st.peek().getType())) {<a name="line.528"></a>
<FONT color="green">529</FONT>          throw new IOException("Identifier expected");<a name="line.529"></a>
<FONT color="green">530</FONT>        }<a name="line.530"></a>
<FONT color="green">531</FONT>        Node n = Node.forIdent(st.pop().getStr());<a name="line.531"></a>
<FONT color="green">532</FONT>        n.parse(args, conf);<a name="line.532"></a>
<FONT color="green">533</FONT>        return new NodeToken(n);<a name="line.533"></a>
<FONT color="green">534</FONT>      }<a name="line.534"></a>
<FONT color="green">535</FONT>    <a name="line.535"></a>
<FONT color="green">536</FONT>      /**<a name="line.536"></a>
<FONT color="green">537</FONT>       * Given an expression and an optional comparator, build a tree of<a name="line.537"></a>
<FONT color="green">538</FONT>       * InputFormats using the comparator to sort keys.<a name="line.538"></a>
<FONT color="green">539</FONT>       */<a name="line.539"></a>
<FONT color="green">540</FONT>      static Node parse(String expr, Configuration conf) throws IOException {<a name="line.540"></a>
<FONT color="green">541</FONT>        if (null == expr) {<a name="line.541"></a>
<FONT color="green">542</FONT>          throw new IOException("Expression is null");<a name="line.542"></a>
<FONT color="green">543</FONT>        }<a name="line.543"></a>
<FONT color="green">544</FONT>        Class&lt;? extends WritableComparator&gt; cmpcl = conf.getClass(<a name="line.544"></a>
<FONT color="green">545</FONT>          CompositeInputFormat.JOIN_COMPARATOR, null, WritableComparator.class);<a name="line.545"></a>
<FONT color="green">546</FONT>        Lexer lex = new Lexer(expr);<a name="line.546"></a>
<FONT color="green">547</FONT>        Stack&lt;Token&gt; st = new Stack&lt;Token&gt;();<a name="line.547"></a>
<FONT color="green">548</FONT>        Token tok;<a name="line.548"></a>
<FONT color="green">549</FONT>        while ((tok = lex.next()) != null) {<a name="line.549"></a>
<FONT color="green">550</FONT>          if (TType.RPAREN.equals(tok.getType())) {<a name="line.550"></a>
<FONT color="green">551</FONT>            st.push(reduce(st, conf));<a name="line.551"></a>
<FONT color="green">552</FONT>          } else {<a name="line.552"></a>
<FONT color="green">553</FONT>            st.push(tok);<a name="line.553"></a>
<FONT color="green">554</FONT>          }<a name="line.554"></a>
<FONT color="green">555</FONT>        }<a name="line.555"></a>
<FONT color="green">556</FONT>        if (st.size() == 1 &amp;&amp; TType.CIF.equals(st.peek().getType())) {<a name="line.556"></a>
<FONT color="green">557</FONT>          Node ret = st.pop().getNode();<a name="line.557"></a>
<FONT color="green">558</FONT>          if (cmpcl != null) {<a name="line.558"></a>
<FONT color="green">559</FONT>            ret.setKeyComparator(cmpcl);<a name="line.559"></a>
<FONT color="green">560</FONT>          }<a name="line.560"></a>
<FONT color="green">561</FONT>          return ret;<a name="line.561"></a>
<FONT color="green">562</FONT>        }<a name="line.562"></a>
<FONT color="green">563</FONT>        throw new IOException("Missing ')'");<a name="line.563"></a>
<FONT color="green">564</FONT>      }<a name="line.564"></a>
<FONT color="green">565</FONT>    <a name="line.565"></a>
<FONT color="green">566</FONT>    }<a name="line.566"></a>




























































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