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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.DataOutput;<a name="line.21"></a>
<FONT color="green">022</FONT>    import java.io.DataInput;<a name="line.22"></a>
<FONT color="green">023</FONT>    import java.io.IOException;<a name="line.23"></a>
<FONT color="green">024</FONT>    import java.util.BitSet;<a name="line.24"></a>
<FONT color="green">025</FONT>    import java.util.Iterator;<a name="line.25"></a>
<FONT color="green">026</FONT>    import java.util.NoSuchElementException;<a name="line.26"></a>
<FONT color="green">027</FONT>    <a name="line.27"></a>
<FONT color="green">028</FONT>    import org.apache.hadoop.classification.InterfaceAudience;<a name="line.28"></a>
<FONT color="green">029</FONT>    import org.apache.hadoop.classification.InterfaceStability;<a name="line.29"></a>
<FONT color="green">030</FONT>    import org.apache.hadoop.io.NullWritable;<a name="line.30"></a>
<FONT color="green">031</FONT>    import org.apache.hadoop.io.Text;<a name="line.31"></a>
<FONT color="green">032</FONT>    import org.apache.hadoop.io.Writable;<a name="line.32"></a>
<FONT color="green">033</FONT>    import org.apache.hadoop.io.WritableUtils;<a name="line.33"></a>
<FONT color="green">034</FONT>    <a name="line.34"></a>
<FONT color="green">035</FONT>    /**<a name="line.35"></a>
<FONT color="green">036</FONT>     * Writable type storing multiple {@link org.apache.hadoop.io.Writable}s.<a name="line.36"></a>
<FONT color="green">037</FONT>     *<a name="line.37"></a>
<FONT color="green">038</FONT>     * This is *not* a general-purpose tuple type. In almost all cases, users are<a name="line.38"></a>
<FONT color="green">039</FONT>     * encouraged to implement their own serializable types, which can perform<a name="line.39"></a>
<FONT color="green">040</FONT>     * better validation and provide more efficient encodings than this class is<a name="line.40"></a>
<FONT color="green">041</FONT>     * capable. TupleWritable relies on the join framework for type safety and<a name="line.41"></a>
<FONT color="green">042</FONT>     * assumes its instances will rarely be persisted, assumptions not only<a name="line.42"></a>
<FONT color="green">043</FONT>     * incompatible with, but contrary to the general case.<a name="line.43"></a>
<FONT color="green">044</FONT>     *<a name="line.44"></a>
<FONT color="green">045</FONT>     * @see org.apache.hadoop.io.Writable<a name="line.45"></a>
<FONT color="green">046</FONT>     */<a name="line.46"></a>
<FONT color="green">047</FONT>    @InterfaceAudience.Public<a name="line.47"></a>
<FONT color="green">048</FONT>    @InterfaceStability.Stable<a name="line.48"></a>
<FONT color="green">049</FONT>    public class TupleWritable implements Writable, Iterable&lt;Writable&gt; {<a name="line.49"></a>
<FONT color="green">050</FONT>    <a name="line.50"></a>
<FONT color="green">051</FONT>      protected BitSet written;<a name="line.51"></a>
<FONT color="green">052</FONT>      private Writable[] values;<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>       * Create an empty tuple with no allocated storage for writables.<a name="line.55"></a>
<FONT color="green">056</FONT>       */<a name="line.56"></a>
<FONT color="green">057</FONT>      public TupleWritable() {<a name="line.57"></a>
<FONT color="green">058</FONT>        written = new BitSet(0);<a name="line.58"></a>
<FONT color="green">059</FONT>      }<a name="line.59"></a>
<FONT color="green">060</FONT>    <a name="line.60"></a>
<FONT color="green">061</FONT>      /**<a name="line.61"></a>
<FONT color="green">062</FONT>       * Initialize tuple with storage; unknown whether any of them contain<a name="line.62"></a>
<FONT color="green">063</FONT>       * &amp;quot;written&amp;quot; values.<a name="line.63"></a>
<FONT color="green">064</FONT>       */<a name="line.64"></a>
<FONT color="green">065</FONT>      public TupleWritable(Writable[] vals) {<a name="line.65"></a>
<FONT color="green">066</FONT>        written = new BitSet(vals.length);<a name="line.66"></a>
<FONT color="green">067</FONT>        values = vals;<a name="line.67"></a>
<FONT color="green">068</FONT>      }<a name="line.68"></a>
<FONT color="green">069</FONT>    <a name="line.69"></a>
<FONT color="green">070</FONT>      /**<a name="line.70"></a>
<FONT color="green">071</FONT>       * Return true if tuple has an element at the position provided.<a name="line.71"></a>
<FONT color="green">072</FONT>       */<a name="line.72"></a>
<FONT color="green">073</FONT>      public boolean has(int i) {<a name="line.73"></a>
<FONT color="green">074</FONT>        return written.get(i);<a name="line.74"></a>
<FONT color="green">075</FONT>      }<a name="line.75"></a>
<FONT color="green">076</FONT>    <a name="line.76"></a>
<FONT color="green">077</FONT>      /**<a name="line.77"></a>
<FONT color="green">078</FONT>       * Get ith Writable from Tuple.<a name="line.78"></a>
<FONT color="green">079</FONT>       */<a name="line.79"></a>
<FONT color="green">080</FONT>      public Writable get(int i) {<a name="line.80"></a>
<FONT color="green">081</FONT>        return values[i];<a name="line.81"></a>
<FONT color="green">082</FONT>      }<a name="line.82"></a>
<FONT color="green">083</FONT>    <a name="line.83"></a>
<FONT color="green">084</FONT>      /**<a name="line.84"></a>
<FONT color="green">085</FONT>       * The number of children in this Tuple.<a name="line.85"></a>
<FONT color="green">086</FONT>       */<a name="line.86"></a>
<FONT color="green">087</FONT>      public int size() {<a name="line.87"></a>
<FONT color="green">088</FONT>        return values.length;<a name="line.88"></a>
<FONT color="green">089</FONT>      }<a name="line.89"></a>
<FONT color="green">090</FONT>    <a name="line.90"></a>
<FONT color="green">091</FONT>      /**<a name="line.91"></a>
<FONT color="green">092</FONT>       * {@inheritDoc}<a name="line.92"></a>
<FONT color="green">093</FONT>       */<a name="line.93"></a>
<FONT color="green">094</FONT>      public boolean equals(Object other) {<a name="line.94"></a>
<FONT color="green">095</FONT>        if (other instanceof TupleWritable) {<a name="line.95"></a>
<FONT color="green">096</FONT>          TupleWritable that = (TupleWritable)other;<a name="line.96"></a>
<FONT color="green">097</FONT>          if (!this.written.equals(that.written)) {<a name="line.97"></a>
<FONT color="green">098</FONT>            return false;<a name="line.98"></a>
<FONT color="green">099</FONT>          }<a name="line.99"></a>
<FONT color="green">100</FONT>          for (int i = 0; i &lt; values.length; ++i) {<a name="line.100"></a>
<FONT color="green">101</FONT>            if (!has(i)) continue;<a name="line.101"></a>
<FONT color="green">102</FONT>            if (!values[i].equals(that.get(i))) {<a name="line.102"></a>
<FONT color="green">103</FONT>              return false;<a name="line.103"></a>
<FONT color="green">104</FONT>            }<a name="line.104"></a>
<FONT color="green">105</FONT>          }<a name="line.105"></a>
<FONT color="green">106</FONT>          return true;<a name="line.106"></a>
<FONT color="green">107</FONT>        }<a name="line.107"></a>
<FONT color="green">108</FONT>        return false;<a name="line.108"></a>
<FONT color="green">109</FONT>      }<a name="line.109"></a>
<FONT color="green">110</FONT>    <a name="line.110"></a>
<FONT color="green">111</FONT>      public int hashCode() {<a name="line.111"></a>
<FONT color="green">112</FONT>        assert false : "hashCode not designed";<a name="line.112"></a>
<FONT color="green">113</FONT>        return written.hashCode();<a name="line.113"></a>
<FONT color="green">114</FONT>      }<a name="line.114"></a>
<FONT color="green">115</FONT>    <a name="line.115"></a>
<FONT color="green">116</FONT>      /**<a name="line.116"></a>
<FONT color="green">117</FONT>       * Return an iterator over the elements in this tuple.<a name="line.117"></a>
<FONT color="green">118</FONT>       * Note that this doesn't flatten the tuple; one may receive tuples<a name="line.118"></a>
<FONT color="green">119</FONT>       * from this iterator.<a name="line.119"></a>
<FONT color="green">120</FONT>       */<a name="line.120"></a>
<FONT color="green">121</FONT>      public Iterator&lt;Writable&gt; iterator() {<a name="line.121"></a>
<FONT color="green">122</FONT>        final TupleWritable t = this;<a name="line.122"></a>
<FONT color="green">123</FONT>        return new Iterator&lt;Writable&gt;() {<a name="line.123"></a>
<FONT color="green">124</FONT>          int bitIndex = written.nextSetBit(0);<a name="line.124"></a>
<FONT color="green">125</FONT>          public boolean hasNext() {<a name="line.125"></a>
<FONT color="green">126</FONT>            return bitIndex &gt;= 0;<a name="line.126"></a>
<FONT color="green">127</FONT>          }<a name="line.127"></a>
<FONT color="green">128</FONT>          public Writable next() {<a name="line.128"></a>
<FONT color="green">129</FONT>            int returnIndex = bitIndex;<a name="line.129"></a>
<FONT color="green">130</FONT>            if (returnIndex &lt; 0)<a name="line.130"></a>
<FONT color="green">131</FONT>              throw new NoSuchElementException();<a name="line.131"></a>
<FONT color="green">132</FONT>            bitIndex = written.nextSetBit(bitIndex+1);<a name="line.132"></a>
<FONT color="green">133</FONT>            return t.get(returnIndex);<a name="line.133"></a>
<FONT color="green">134</FONT>          }<a name="line.134"></a>
<FONT color="green">135</FONT>          public void remove() {<a name="line.135"></a>
<FONT color="green">136</FONT>            if (!written.get(bitIndex)) {<a name="line.136"></a>
<FONT color="green">137</FONT>              throw new IllegalStateException(<a name="line.137"></a>
<FONT color="green">138</FONT>                "Attempt to remove non-existent val");<a name="line.138"></a>
<FONT color="green">139</FONT>            }<a name="line.139"></a>
<FONT color="green">140</FONT>            written.clear(bitIndex);<a name="line.140"></a>
<FONT color="green">141</FONT>          }<a name="line.141"></a>
<FONT color="green">142</FONT>        };<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>       * Convert Tuple to String as in the following.<a name="line.146"></a>
<FONT color="green">147</FONT>       * &lt;tt&gt;[&lt;child1&gt;,&lt;child2&gt;,...,&lt;childn&gt;]&lt;/tt&gt;<a name="line.147"></a>
<FONT color="green">148</FONT>       */<a name="line.148"></a>
<FONT color="green">149</FONT>      public String toString() {<a name="line.149"></a>
<FONT color="green">150</FONT>        StringBuffer buf = new StringBuffer("[");<a name="line.150"></a>
<FONT color="green">151</FONT>        for (int i = 0; i &lt; values.length; ++i) {<a name="line.151"></a>
<FONT color="green">152</FONT>          buf.append(has(i) ? values[i].toString() : "");<a name="line.152"></a>
<FONT color="green">153</FONT>          buf.append(",");<a name="line.153"></a>
<FONT color="green">154</FONT>        }<a name="line.154"></a>
<FONT color="green">155</FONT>        if (values.length != 0)<a name="line.155"></a>
<FONT color="green">156</FONT>          buf.setCharAt(buf.length() - 1, ']');<a name="line.156"></a>
<FONT color="green">157</FONT>        else<a name="line.157"></a>
<FONT color="green">158</FONT>          buf.append(']');<a name="line.158"></a>
<FONT color="green">159</FONT>        return buf.toString();<a name="line.159"></a>
<FONT color="green">160</FONT>      }<a name="line.160"></a>
<FONT color="green">161</FONT>    <a name="line.161"></a>
<FONT color="green">162</FONT>      // Writable<a name="line.162"></a>
<FONT color="green">163</FONT>    <a name="line.163"></a>
<FONT color="green">164</FONT>      /** Writes each Writable to &lt;code&gt;out&lt;/code&gt;.<a name="line.164"></a>
<FONT color="green">165</FONT>       * TupleWritable format:<a name="line.165"></a>
<FONT color="green">166</FONT>       * {@code<a name="line.166"></a>
<FONT color="green">167</FONT>       *  &lt;count&gt;&lt;type1&gt;&lt;type2&gt;...&lt;typen&gt;&lt;obj1&gt;&lt;obj2&gt;...&lt;objn&gt;<a name="line.167"></a>
<FONT color="green">168</FONT>       * }<a name="line.168"></a>
<FONT color="green">169</FONT>       */<a name="line.169"></a>
<FONT color="green">170</FONT>      public void write(DataOutput out) throws IOException {<a name="line.170"></a>
<FONT color="green">171</FONT>        WritableUtils.writeVInt(out, values.length);<a name="line.171"></a>
<FONT color="green">172</FONT>        writeBitSet(out, values.length, written);<a name="line.172"></a>
<FONT color="green">173</FONT>        for (int i = 0; i &lt; values.length; ++i) {<a name="line.173"></a>
<FONT color="green">174</FONT>          Text.writeString(out, values[i].getClass().getName());<a name="line.174"></a>
<FONT color="green">175</FONT>        }<a name="line.175"></a>
<FONT color="green">176</FONT>        for (int i = 0; i &lt; values.length; ++i) {<a name="line.176"></a>
<FONT color="green">177</FONT>          if (has(i)) {<a name="line.177"></a>
<FONT color="green">178</FONT>            values[i].write(out);<a name="line.178"></a>
<FONT color="green">179</FONT>          }<a name="line.179"></a>
<FONT color="green">180</FONT>        }<a name="line.180"></a>
<FONT color="green">181</FONT>      }<a name="line.181"></a>
<FONT color="green">182</FONT>    <a name="line.182"></a>
<FONT color="green">183</FONT>      /**<a name="line.183"></a>
<FONT color="green">184</FONT>       * {@inheritDoc}<a name="line.184"></a>
<FONT color="green">185</FONT>       */<a name="line.185"></a>
<FONT color="green">186</FONT>      @SuppressWarnings("unchecked") // No static typeinfo on Tuples<a name="line.186"></a>
<FONT color="green">187</FONT>      public void readFields(DataInput in) throws IOException {<a name="line.187"></a>
<FONT color="green">188</FONT>        int card = WritableUtils.readVInt(in);<a name="line.188"></a>
<FONT color="green">189</FONT>        values = new Writable[card];<a name="line.189"></a>
<FONT color="green">190</FONT>        readBitSet(in, card, written);<a name="line.190"></a>
<FONT color="green">191</FONT>        Class&lt;? extends Writable&gt;[] cls = new Class[card];<a name="line.191"></a>
<FONT color="green">192</FONT>        try {<a name="line.192"></a>
<FONT color="green">193</FONT>          for (int i = 0; i &lt; card; ++i) {<a name="line.193"></a>
<FONT color="green">194</FONT>            cls[i] = Class.forName(Text.readString(in)).asSubclass(Writable.class);<a name="line.194"></a>
<FONT color="green">195</FONT>          }<a name="line.195"></a>
<FONT color="green">196</FONT>          for (int i = 0; i &lt; card; ++i) {<a name="line.196"></a>
<FONT color="green">197</FONT>            if (cls[i].equals(NullWritable.class)) {<a name="line.197"></a>
<FONT color="green">198</FONT>              values[i] = NullWritable.get();<a name="line.198"></a>
<FONT color="green">199</FONT>            } else {<a name="line.199"></a>
<FONT color="green">200</FONT>              values[i] = cls[i].newInstance();<a name="line.200"></a>
<FONT color="green">201</FONT>            }<a name="line.201"></a>
<FONT color="green">202</FONT>            if (has(i)) {<a name="line.202"></a>
<FONT color="green">203</FONT>              values[i].readFields(in);<a name="line.203"></a>
<FONT color="green">204</FONT>            }<a name="line.204"></a>
<FONT color="green">205</FONT>          }<a name="line.205"></a>
<FONT color="green">206</FONT>        } catch (ClassNotFoundException e) {<a name="line.206"></a>
<FONT color="green">207</FONT>          throw new IOException("Failed tuple init", e);<a name="line.207"></a>
<FONT color="green">208</FONT>        } catch (IllegalAccessException e) {<a name="line.208"></a>
<FONT color="green">209</FONT>          throw new IOException("Failed tuple init", e);<a name="line.209"></a>
<FONT color="green">210</FONT>        } catch (InstantiationException e) {<a name="line.210"></a>
<FONT color="green">211</FONT>          throw new IOException("Failed tuple init", e);<a name="line.211"></a>
<FONT color="green">212</FONT>        }<a name="line.212"></a>
<FONT color="green">213</FONT>      }<a name="line.213"></a>
<FONT color="green">214</FONT>    <a name="line.214"></a>
<FONT color="green">215</FONT>      /**<a name="line.215"></a>
<FONT color="green">216</FONT>       * Record that the tuple contains an element at the position provided.<a name="line.216"></a>
<FONT color="green">217</FONT>       */<a name="line.217"></a>
<FONT color="green">218</FONT>      void setWritten(int i) {<a name="line.218"></a>
<FONT color="green">219</FONT>        written.set(i);<a name="line.219"></a>
<FONT color="green">220</FONT>      }<a name="line.220"></a>
<FONT color="green">221</FONT>    <a name="line.221"></a>
<FONT color="green">222</FONT>      /**<a name="line.222"></a>
<FONT color="green">223</FONT>       * Record that the tuple does not contain an element at the position<a name="line.223"></a>
<FONT color="green">224</FONT>       * provided.<a name="line.224"></a>
<FONT color="green">225</FONT>       */<a name="line.225"></a>
<FONT color="green">226</FONT>      void clearWritten(int i) {<a name="line.226"></a>
<FONT color="green">227</FONT>        written.clear(i);<a name="line.227"></a>
<FONT color="green">228</FONT>      }<a name="line.228"></a>
<FONT color="green">229</FONT>    <a name="line.229"></a>
<FONT color="green">230</FONT>      /**<a name="line.230"></a>
<FONT color="green">231</FONT>       * Clear any record of which writables have been written to, without<a name="line.231"></a>
<FONT color="green">232</FONT>       * releasing storage.<a name="line.232"></a>
<FONT color="green">233</FONT>       */<a name="line.233"></a>
<FONT color="green">234</FONT>      void clearWritten() {<a name="line.234"></a>
<FONT color="green">235</FONT>        written.clear();<a name="line.235"></a>
<FONT color="green">236</FONT>      }<a name="line.236"></a>
<FONT color="green">237</FONT>    <a name="line.237"></a>
<FONT color="green">238</FONT>      /**<a name="line.238"></a>
<FONT color="green">239</FONT>       * Writes the bit set to the stream. The first 64 bit-positions of the bit<a name="line.239"></a>
<FONT color="green">240</FONT>       * set are written as a VLong for backwards-compatibility with older <a name="line.240"></a>
<FONT color="green">241</FONT>       * versions of TupleWritable. All bit-positions &gt;= 64 are encoded as a byte<a name="line.241"></a>
<FONT color="green">242</FONT>       * for every 8 bit-positions.<a name="line.242"></a>
<FONT color="green">243</FONT>       */<a name="line.243"></a>
<FONT color="green">244</FONT>      private static final void writeBitSet(DataOutput stream, int nbits,<a name="line.244"></a>
<FONT color="green">245</FONT>          BitSet bitSet) throws IOException {<a name="line.245"></a>
<FONT color="green">246</FONT>        long bits = 0L;<a name="line.246"></a>
<FONT color="green">247</FONT>            <a name="line.247"></a>
<FONT color="green">248</FONT>        int bitSetIndex = bitSet.nextSetBit(0);<a name="line.248"></a>
<FONT color="green">249</FONT>        for (;bitSetIndex &gt;= 0 &amp;&amp; bitSetIndex &lt; Long.SIZE;<a name="line.249"></a>
<FONT color="green">250</FONT>                bitSetIndex=bitSet.nextSetBit(bitSetIndex+1)) {<a name="line.250"></a>
<FONT color="green">251</FONT>          bits |= 1L &lt;&lt; bitSetIndex;<a name="line.251"></a>
<FONT color="green">252</FONT>        }<a name="line.252"></a>
<FONT color="green">253</FONT>        WritableUtils.writeVLong(stream,bits);<a name="line.253"></a>
<FONT color="green">254</FONT>        <a name="line.254"></a>
<FONT color="green">255</FONT>        if (nbits &gt; Long.SIZE) {<a name="line.255"></a>
<FONT color="green">256</FONT>          bits = 0L;<a name="line.256"></a>
<FONT color="green">257</FONT>          for (int lastWordWritten = 0; bitSetIndex &gt;= 0 &amp;&amp; bitSetIndex &lt; nbits; <a name="line.257"></a>
<FONT color="green">258</FONT>                  bitSetIndex = bitSet.nextSetBit(bitSetIndex+1)) {<a name="line.258"></a>
<FONT color="green">259</FONT>            int bitsIndex = bitSetIndex % Byte.SIZE;<a name="line.259"></a>
<FONT color="green">260</FONT>            int word = (bitSetIndex-Long.SIZE) / Byte.SIZE;<a name="line.260"></a>
<FONT color="green">261</FONT>            if (word &gt; lastWordWritten) {<a name="line.261"></a>
<FONT color="green">262</FONT>              stream.writeByte((byte)bits);<a name="line.262"></a>
<FONT color="green">263</FONT>              bits = 0L;<a name="line.263"></a>
<FONT color="green">264</FONT>              for (lastWordWritten++;lastWordWritten&lt;word;lastWordWritten++) {<a name="line.264"></a>
<FONT color="green">265</FONT>                stream.writeByte((byte)bits);<a name="line.265"></a>
<FONT color="green">266</FONT>              }<a name="line.266"></a>
<FONT color="green">267</FONT>            }<a name="line.267"></a>
<FONT color="green">268</FONT>            bits |= 1L &lt;&lt; bitsIndex;<a name="line.268"></a>
<FONT color="green">269</FONT>          }<a name="line.269"></a>
<FONT color="green">270</FONT>          stream.writeByte((byte)bits);<a name="line.270"></a>
<FONT color="green">271</FONT>        }<a name="line.271"></a>
<FONT color="green">272</FONT>      }<a name="line.272"></a>
<FONT color="green">273</FONT>    <a name="line.273"></a>
<FONT color="green">274</FONT>      /**<a name="line.274"></a>
<FONT color="green">275</FONT>       * Reads a bitset from the stream that has been written with<a name="line.275"></a>
<FONT color="green">276</FONT>       * {@link #writeBitSet(DataOutput, int, BitSet)}.<a name="line.276"></a>
<FONT color="green">277</FONT>       */<a name="line.277"></a>
<FONT color="green">278</FONT>      private static final void readBitSet(DataInput stream, int nbits, <a name="line.278"></a>
<FONT color="green">279</FONT>          BitSet bitSet) throws IOException {<a name="line.279"></a>
<FONT color="green">280</FONT>        bitSet.clear();<a name="line.280"></a>
<FONT color="green">281</FONT>        long initialBits = WritableUtils.readVLong(stream);<a name="line.281"></a>
<FONT color="green">282</FONT>        long last = 0L;<a name="line.282"></a>
<FONT color="green">283</FONT>        while (0L != initialBits) {<a name="line.283"></a>
<FONT color="green">284</FONT>          last = Long.lowestOneBit(initialBits);<a name="line.284"></a>
<FONT color="green">285</FONT>          initialBits ^= last;<a name="line.285"></a>
<FONT color="green">286</FONT>          bitSet.set(Long.numberOfTrailingZeros(last));<a name="line.286"></a>
<FONT color="green">287</FONT>        }<a name="line.287"></a>
<FONT color="green">288</FONT>        <a name="line.288"></a>
<FONT color="green">289</FONT>        for (int offset=Long.SIZE; offset &lt; nbits; offset+=Byte.SIZE) {<a name="line.289"></a>
<FONT color="green">290</FONT>          byte bits = stream.readByte();<a name="line.290"></a>
<FONT color="green">291</FONT>          while (0 != bits) {<a name="line.291"></a>
<FONT color="green">292</FONT>            last = Long.lowestOneBit(bits);<a name="line.292"></a>
<FONT color="green">293</FONT>            bits ^= last;<a name="line.293"></a>
<FONT color="green">294</FONT>            bitSet.set(Long.numberOfTrailingZeros(last) + offset);<a name="line.294"></a>
<FONT color="green">295</FONT>          }<a name="line.295"></a>
<FONT color="green">296</FONT>        }<a name="line.296"></a>
<FONT color="green">297</FONT>      }<a name="line.297"></a>
<FONT color="green">298</FONT>    }<a name="line.298"></a>




























































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