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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>    package org.apache.hadoop.io.compress;<a name="line.18"></a>
<FONT color="green">019</FONT>    <a name="line.19"></a>
<FONT color="green">020</FONT>    import java.util.*;<a name="line.20"></a>
<FONT color="green">021</FONT>    <a name="line.21"></a>
<FONT color="green">022</FONT>    import org.apache.commons.logging.Log;<a name="line.22"></a>
<FONT color="green">023</FONT>    import org.apache.commons.logging.LogFactory;<a name="line.23"></a>
<FONT color="green">024</FONT>    import org.apache.hadoop.classification.InterfaceAudience;<a name="line.24"></a>
<FONT color="green">025</FONT>    import org.apache.hadoop.classification.InterfaceStability;<a name="line.25"></a>
<FONT color="green">026</FONT>    import org.apache.hadoop.conf.Configuration;<a name="line.26"></a>
<FONT color="green">027</FONT>    import org.apache.hadoop.fs.Path;<a name="line.27"></a>
<FONT color="green">028</FONT>    import org.apache.hadoop.util.ReflectionUtils;<a name="line.28"></a>
<FONT color="green">029</FONT>    <a name="line.29"></a>
<FONT color="green">030</FONT>    /**<a name="line.30"></a>
<FONT color="green">031</FONT>     * A factory that will find the correct codec for a given filename.<a name="line.31"></a>
<FONT color="green">032</FONT>     */<a name="line.32"></a>
<FONT color="green">033</FONT>    @InterfaceAudience.Public<a name="line.33"></a>
<FONT color="green">034</FONT>    @InterfaceStability.Evolving<a name="line.34"></a>
<FONT color="green">035</FONT>    public class CompressionCodecFactory {<a name="line.35"></a>
<FONT color="green">036</FONT>    <a name="line.36"></a>
<FONT color="green">037</FONT>      public static final Log LOG =<a name="line.37"></a>
<FONT color="green">038</FONT>        LogFactory.getLog(CompressionCodecFactory.class.getName());<a name="line.38"></a>
<FONT color="green">039</FONT>      <a name="line.39"></a>
<FONT color="green">040</FONT>      private static final ServiceLoader&lt;CompressionCodec&gt; CODEC_PROVIDERS =<a name="line.40"></a>
<FONT color="green">041</FONT>        ServiceLoader.load(CompressionCodec.class);<a name="line.41"></a>
<FONT color="green">042</FONT>    <a name="line.42"></a>
<FONT color="green">043</FONT>      /**<a name="line.43"></a>
<FONT color="green">044</FONT>       * A map from the reversed filename suffixes to the codecs.<a name="line.44"></a>
<FONT color="green">045</FONT>       * This is probably overkill, because the maps should be small, but it <a name="line.45"></a>
<FONT color="green">046</FONT>       * automatically supports finding the longest matching suffix. <a name="line.46"></a>
<FONT color="green">047</FONT>       */<a name="line.47"></a>
<FONT color="green">048</FONT>      private SortedMap&lt;String, CompressionCodec&gt; codecs = null;<a name="line.48"></a>
<FONT color="green">049</FONT>    <a name="line.49"></a>
<FONT color="green">050</FONT>        /**<a name="line.50"></a>
<FONT color="green">051</FONT>         * A map from the reversed filename suffixes to the codecs.<a name="line.51"></a>
<FONT color="green">052</FONT>         * This is probably overkill, because the maps should be small, but it<a name="line.52"></a>
<FONT color="green">053</FONT>         * automatically supports finding the longest matching suffix.<a name="line.53"></a>
<FONT color="green">054</FONT>         */<a name="line.54"></a>
<FONT color="green">055</FONT>        private Map&lt;String, CompressionCodec&gt; codecsByName = null;<a name="line.55"></a>
<FONT color="green">056</FONT>    <a name="line.56"></a>
<FONT color="green">057</FONT>      /**<a name="line.57"></a>
<FONT color="green">058</FONT>       * A map from class names to the codecs<a name="line.58"></a>
<FONT color="green">059</FONT>       */<a name="line.59"></a>
<FONT color="green">060</FONT>      private HashMap&lt;String, CompressionCodec&gt; codecsByClassName = null;<a name="line.60"></a>
<FONT color="green">061</FONT>    <a name="line.61"></a>
<FONT color="green">062</FONT>      private void addCodec(CompressionCodec codec) {<a name="line.62"></a>
<FONT color="green">063</FONT>        String suffix = codec.getDefaultExtension();<a name="line.63"></a>
<FONT color="green">064</FONT>        codecs.put(new StringBuilder(suffix).reverse().toString(), codec);<a name="line.64"></a>
<FONT color="green">065</FONT>        codecsByClassName.put(codec.getClass().getCanonicalName(), codec);<a name="line.65"></a>
<FONT color="green">066</FONT>    <a name="line.66"></a>
<FONT color="green">067</FONT>        String codecName = codec.getClass().getSimpleName();<a name="line.67"></a>
<FONT color="green">068</FONT>        codecsByName.put(codecName.toLowerCase(), codec);<a name="line.68"></a>
<FONT color="green">069</FONT>        if (codecName.endsWith("Codec")) {<a name="line.69"></a>
<FONT color="green">070</FONT>          codecName = codecName.substring(0, codecName.length() - "Codec".length());<a name="line.70"></a>
<FONT color="green">071</FONT>          codecsByName.put(codecName.toLowerCase(), codec);<a name="line.71"></a>
<FONT color="green">072</FONT>        }<a name="line.72"></a>
<FONT color="green">073</FONT>      }<a name="line.73"></a>
<FONT color="green">074</FONT>    <a name="line.74"></a>
<FONT color="green">075</FONT>      /**<a name="line.75"></a>
<FONT color="green">076</FONT>       * Print the extension map out as a string.<a name="line.76"></a>
<FONT color="green">077</FONT>       */<a name="line.77"></a>
<FONT color="green">078</FONT>      public String toString() {<a name="line.78"></a>
<FONT color="green">079</FONT>        StringBuilder buf = new StringBuilder();<a name="line.79"></a>
<FONT color="green">080</FONT>        Iterator&lt;Map.Entry&lt;String, CompressionCodec&gt;&gt; itr = <a name="line.80"></a>
<FONT color="green">081</FONT>          codecs.entrySet().iterator();<a name="line.81"></a>
<FONT color="green">082</FONT>        buf.append("{ ");<a name="line.82"></a>
<FONT color="green">083</FONT>        if (itr.hasNext()) {<a name="line.83"></a>
<FONT color="green">084</FONT>          Map.Entry&lt;String, CompressionCodec&gt; entry = itr.next();<a name="line.84"></a>
<FONT color="green">085</FONT>          buf.append(entry.getKey());<a name="line.85"></a>
<FONT color="green">086</FONT>          buf.append(": ");<a name="line.86"></a>
<FONT color="green">087</FONT>          buf.append(entry.getValue().getClass().getName());<a name="line.87"></a>
<FONT color="green">088</FONT>          while (itr.hasNext()) {<a name="line.88"></a>
<FONT color="green">089</FONT>            entry = itr.next();<a name="line.89"></a>
<FONT color="green">090</FONT>            buf.append(", ");<a name="line.90"></a>
<FONT color="green">091</FONT>            buf.append(entry.getKey());<a name="line.91"></a>
<FONT color="green">092</FONT>            buf.append(": ");<a name="line.92"></a>
<FONT color="green">093</FONT>            buf.append(entry.getValue().getClass().getName());<a name="line.93"></a>
<FONT color="green">094</FONT>          }<a name="line.94"></a>
<FONT color="green">095</FONT>        }<a name="line.95"></a>
<FONT color="green">096</FONT>        buf.append(" }");<a name="line.96"></a>
<FONT color="green">097</FONT>        return buf.toString();<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>      /**<a name="line.100"></a>
<FONT color="green">101</FONT>       * Get the list of codecs discovered via a Java ServiceLoader, or<a name="line.101"></a>
<FONT color="green">102</FONT>       * listed in the configuration. Codecs specified in configuration come<a name="line.102"></a>
<FONT color="green">103</FONT>       * later in the returned list, and are considered to override those<a name="line.103"></a>
<FONT color="green">104</FONT>       * from the ServiceLoader.<a name="line.104"></a>
<FONT color="green">105</FONT>       * @param conf the configuration to look in<a name="line.105"></a>
<FONT color="green">106</FONT>       * @return a list of the {@link CompressionCodec} classes<a name="line.106"></a>
<FONT color="green">107</FONT>       */<a name="line.107"></a>
<FONT color="green">108</FONT>      public static List&lt;Class&lt;? extends CompressionCodec&gt;&gt; getCodecClasses(Configuration conf) {<a name="line.108"></a>
<FONT color="green">109</FONT>        List&lt;Class&lt;? extends CompressionCodec&gt;&gt; result<a name="line.109"></a>
<FONT color="green">110</FONT>          = new ArrayList&lt;Class&lt;? extends CompressionCodec&gt;&gt;();<a name="line.110"></a>
<FONT color="green">111</FONT>        // Add codec classes discovered via service loading<a name="line.111"></a>
<FONT color="green">112</FONT>        for (CompressionCodec codec : CODEC_PROVIDERS) {<a name="line.112"></a>
<FONT color="green">113</FONT>          result.add(codec.getClass());<a name="line.113"></a>
<FONT color="green">114</FONT>        }<a name="line.114"></a>
<FONT color="green">115</FONT>        // Add codec classes from configuration<a name="line.115"></a>
<FONT color="green">116</FONT>        String codecsString = conf.get("io.compression.codecs");<a name="line.116"></a>
<FONT color="green">117</FONT>        if (codecsString != null) {<a name="line.117"></a>
<FONT color="green">118</FONT>          StringTokenizer codecSplit = new StringTokenizer(codecsString, ",");<a name="line.118"></a>
<FONT color="green">119</FONT>          while (codecSplit.hasMoreElements()) {<a name="line.119"></a>
<FONT color="green">120</FONT>            String codecSubstring = codecSplit.nextToken();<a name="line.120"></a>
<FONT color="green">121</FONT>            if (codecSubstring.length() != 0) {<a name="line.121"></a>
<FONT color="green">122</FONT>              try {<a name="line.122"></a>
<FONT color="green">123</FONT>                Class&lt;?&gt; cls = conf.getClassByName(codecSubstring);<a name="line.123"></a>
<FONT color="green">124</FONT>                if (!CompressionCodec.class.isAssignableFrom(cls)) {<a name="line.124"></a>
<FONT color="green">125</FONT>                  throw new IllegalArgumentException("Class " + codecSubstring +<a name="line.125"></a>
<FONT color="green">126</FONT>                                                     " is not a CompressionCodec");<a name="line.126"></a>
<FONT color="green">127</FONT>                }<a name="line.127"></a>
<FONT color="green">128</FONT>                result.add(cls.asSubclass(CompressionCodec.class));<a name="line.128"></a>
<FONT color="green">129</FONT>              } catch (ClassNotFoundException ex) {<a name="line.129"></a>
<FONT color="green">130</FONT>                throw new IllegalArgumentException("Compression codec " + <a name="line.130"></a>
<FONT color="green">131</FONT>                                                   codecSubstring + " not found.",<a name="line.131"></a>
<FONT color="green">132</FONT>                                                   ex);<a name="line.132"></a>
<FONT color="green">133</FONT>              }<a name="line.133"></a>
<FONT color="green">134</FONT>            }<a name="line.134"></a>
<FONT color="green">135</FONT>          }<a name="line.135"></a>
<FONT color="green">136</FONT>        }<a name="line.136"></a>
<FONT color="green">137</FONT>        return result;<a name="line.137"></a>
<FONT color="green">138</FONT>      }<a name="line.138"></a>
<FONT color="green">139</FONT>      <a name="line.139"></a>
<FONT color="green">140</FONT>      /**<a name="line.140"></a>
<FONT color="green">141</FONT>       * Sets a list of codec classes in the configuration. In addition to any<a name="line.141"></a>
<FONT color="green">142</FONT>       * classes specified using this method, {@link CompressionCodec} classes on<a name="line.142"></a>
<FONT color="green">143</FONT>       * the classpath are discovered using a Java ServiceLoader.<a name="line.143"></a>
<FONT color="green">144</FONT>       * @param conf the configuration to modify<a name="line.144"></a>
<FONT color="green">145</FONT>       * @param classes the list of classes to set<a name="line.145"></a>
<FONT color="green">146</FONT>       */<a name="line.146"></a>
<FONT color="green">147</FONT>      public static void setCodecClasses(Configuration conf,<a name="line.147"></a>
<FONT color="green">148</FONT>                                         List&lt;Class&gt; classes) {<a name="line.148"></a>
<FONT color="green">149</FONT>        StringBuilder buf = new StringBuilder();<a name="line.149"></a>
<FONT color="green">150</FONT>        Iterator&lt;Class&gt; itr = classes.iterator();<a name="line.150"></a>
<FONT color="green">151</FONT>        if (itr.hasNext()) {<a name="line.151"></a>
<FONT color="green">152</FONT>          Class cls = itr.next();<a name="line.152"></a>
<FONT color="green">153</FONT>          buf.append(cls.getName());<a name="line.153"></a>
<FONT color="green">154</FONT>          while(itr.hasNext()) {<a name="line.154"></a>
<FONT color="green">155</FONT>            buf.append(',');<a name="line.155"></a>
<FONT color="green">156</FONT>            buf.append(itr.next().getName());<a name="line.156"></a>
<FONT color="green">157</FONT>          }<a name="line.157"></a>
<FONT color="green">158</FONT>        }<a name="line.158"></a>
<FONT color="green">159</FONT>        conf.set("io.compression.codecs", 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>      /**<a name="line.162"></a>
<FONT color="green">163</FONT>       * Find the codecs specified in the config value io.compression.codecs <a name="line.163"></a>
<FONT color="green">164</FONT>       * and register them. Defaults to gzip and deflate.<a name="line.164"></a>
<FONT color="green">165</FONT>       */<a name="line.165"></a>
<FONT color="green">166</FONT>      public CompressionCodecFactory(Configuration conf) {<a name="line.166"></a>
<FONT color="green">167</FONT>        codecs = new TreeMap&lt;String, CompressionCodec&gt;();<a name="line.167"></a>
<FONT color="green">168</FONT>        codecsByClassName = new HashMap&lt;String, CompressionCodec&gt;();<a name="line.168"></a>
<FONT color="green">169</FONT>        codecsByName = new HashMap&lt;String, CompressionCodec&gt;();<a name="line.169"></a>
<FONT color="green">170</FONT>        List&lt;Class&lt;? extends CompressionCodec&gt;&gt; codecClasses = getCodecClasses(conf);<a name="line.170"></a>
<FONT color="green">171</FONT>        if (codecClasses == null || codecClasses.isEmpty()) {<a name="line.171"></a>
<FONT color="green">172</FONT>          addCodec(new GzipCodec());<a name="line.172"></a>
<FONT color="green">173</FONT>          addCodec(new DefaultCodec());      <a name="line.173"></a>
<FONT color="green">174</FONT>        } else {<a name="line.174"></a>
<FONT color="green">175</FONT>          for (Class&lt;? extends CompressionCodec&gt; codecClass : codecClasses) {<a name="line.175"></a>
<FONT color="green">176</FONT>            addCodec(ReflectionUtils.newInstance(codecClass, conf));<a name="line.176"></a>
<FONT color="green">177</FONT>          }<a name="line.177"></a>
<FONT color="green">178</FONT>        }<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>       * Find the relevant compression codec for the given file based on its<a name="line.182"></a>
<FONT color="green">183</FONT>       * filename suffix.<a name="line.183"></a>
<FONT color="green">184</FONT>       * @param file the filename to check<a name="line.184"></a>
<FONT color="green">185</FONT>       * @return the codec object<a name="line.185"></a>
<FONT color="green">186</FONT>       */<a name="line.186"></a>
<FONT color="green">187</FONT>      public CompressionCodec getCodec(Path file) {<a name="line.187"></a>
<FONT color="green">188</FONT>        CompressionCodec result = null;<a name="line.188"></a>
<FONT color="green">189</FONT>        if (codecs != null) {<a name="line.189"></a>
<FONT color="green">190</FONT>          String filename = file.getName();<a name="line.190"></a>
<FONT color="green">191</FONT>          String reversedFilename = new StringBuilder(filename).reverse().toString();<a name="line.191"></a>
<FONT color="green">192</FONT>          SortedMap&lt;String, CompressionCodec&gt; subMap = <a name="line.192"></a>
<FONT color="green">193</FONT>            codecs.headMap(reversedFilename);<a name="line.193"></a>
<FONT color="green">194</FONT>          if (!subMap.isEmpty()) {<a name="line.194"></a>
<FONT color="green">195</FONT>            String potentialSuffix = subMap.lastKey();<a name="line.195"></a>
<FONT color="green">196</FONT>            if (reversedFilename.startsWith(potentialSuffix)) {<a name="line.196"></a>
<FONT color="green">197</FONT>              result = codecs.get(potentialSuffix);<a name="line.197"></a>
<FONT color="green">198</FONT>            }<a name="line.198"></a>
<FONT color="green">199</FONT>          }<a name="line.199"></a>
<FONT color="green">200</FONT>        }<a name="line.200"></a>
<FONT color="green">201</FONT>        return result;<a name="line.201"></a>
<FONT color="green">202</FONT>      }<a name="line.202"></a>
<FONT color="green">203</FONT>      <a name="line.203"></a>
<FONT color="green">204</FONT>      /**<a name="line.204"></a>
<FONT color="green">205</FONT>       * Find the relevant compression codec for the codec's canonical class name.<a name="line.205"></a>
<FONT color="green">206</FONT>       * @param classname the canonical class name of the codec<a name="line.206"></a>
<FONT color="green">207</FONT>       * @return the codec object<a name="line.207"></a>
<FONT color="green">208</FONT>       */<a name="line.208"></a>
<FONT color="green">209</FONT>      public CompressionCodec getCodecByClassName(String classname) {<a name="line.209"></a>
<FONT color="green">210</FONT>        if (codecsByClassName == null) {<a name="line.210"></a>
<FONT color="green">211</FONT>          return null;<a name="line.211"></a>
<FONT color="green">212</FONT>        }<a name="line.212"></a>
<FONT color="green">213</FONT>        return codecsByClassName.get(classname);<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>        /**<a name="line.216"></a>
<FONT color="green">217</FONT>         * Find the relevant compression codec for the codec's canonical class name<a name="line.217"></a>
<FONT color="green">218</FONT>         * or by codec alias.<a name="line.218"></a>
<FONT color="green">219</FONT>         * &lt;p/&gt;<a name="line.219"></a>
<FONT color="green">220</FONT>         * Codec aliases are case insensitive.<a name="line.220"></a>
<FONT color="green">221</FONT>         * &lt;p/&gt;<a name="line.221"></a>
<FONT color="green">222</FONT>         * The code alias is the short class name (without the package name).<a name="line.222"></a>
<FONT color="green">223</FONT>         * If the short class name ends with 'Codec', then there are two aliases for<a name="line.223"></a>
<FONT color="green">224</FONT>         * the codec, the complete short class name and the short class name without<a name="line.224"></a>
<FONT color="green">225</FONT>         * the 'Codec' ending. For example for the 'GzipCodec' codec class name the<a name="line.225"></a>
<FONT color="green">226</FONT>         * alias are 'gzip' and 'gzipcodec'.<a name="line.226"></a>
<FONT color="green">227</FONT>         *<a name="line.227"></a>
<FONT color="green">228</FONT>         * @param codecName the canonical class name of the codec<a name="line.228"></a>
<FONT color="green">229</FONT>         * @return the codec object<a name="line.229"></a>
<FONT color="green">230</FONT>         */<a name="line.230"></a>
<FONT color="green">231</FONT>        public CompressionCodec getCodecByName(String codecName) {<a name="line.231"></a>
<FONT color="green">232</FONT>          if (codecsByClassName == null) {<a name="line.232"></a>
<FONT color="green">233</FONT>            return null;<a name="line.233"></a>
<FONT color="green">234</FONT>          }<a name="line.234"></a>
<FONT color="green">235</FONT>          CompressionCodec codec = getCodecByClassName(codecName);<a name="line.235"></a>
<FONT color="green">236</FONT>          if (codec == null) {<a name="line.236"></a>
<FONT color="green">237</FONT>            // trying to get the codec by name in case the name was specified instead a class<a name="line.237"></a>
<FONT color="green">238</FONT>            codec = codecsByName.get(codecName.toLowerCase());<a name="line.238"></a>
<FONT color="green">239</FONT>          }<a name="line.239"></a>
<FONT color="green">240</FONT>          return codec;<a name="line.240"></a>
<FONT color="green">241</FONT>        }<a name="line.241"></a>
<FONT color="green">242</FONT>    <a name="line.242"></a>
<FONT color="green">243</FONT>        /**<a name="line.243"></a>
<FONT color="green">244</FONT>         * Find the relevant compression codec for the codec's canonical class name<a name="line.244"></a>
<FONT color="green">245</FONT>         * or by codec alias and returns its implemetation class.<a name="line.245"></a>
<FONT color="green">246</FONT>         * &lt;p/&gt;<a name="line.246"></a>
<FONT color="green">247</FONT>         * Codec aliases are case insensitive.<a name="line.247"></a>
<FONT color="green">248</FONT>         * &lt;p/&gt;<a name="line.248"></a>
<FONT color="green">249</FONT>         * The code alias is the short class name (without the package name).<a name="line.249"></a>
<FONT color="green">250</FONT>         * If the short class name ends with 'Codec', then there are two aliases for<a name="line.250"></a>
<FONT color="green">251</FONT>         * the codec, the complete short class name and the short class name without<a name="line.251"></a>
<FONT color="green">252</FONT>         * the 'Codec' ending. For example for the 'GzipCodec' codec class name the<a name="line.252"></a>
<FONT color="green">253</FONT>         * alias are 'gzip' and 'gzipcodec'.<a name="line.253"></a>
<FONT color="green">254</FONT>         *<a name="line.254"></a>
<FONT color="green">255</FONT>         * @param codecName the canonical class name of the codec<a name="line.255"></a>
<FONT color="green">256</FONT>         * @return the codec class<a name="line.256"></a>
<FONT color="green">257</FONT>         */<a name="line.257"></a>
<FONT color="green">258</FONT>        public Class&lt;? extends CompressionCodec&gt; getCodecClassByName(String codecName) {<a name="line.258"></a>
<FONT color="green">259</FONT>          CompressionCodec codec = getCodecByName(codecName);<a name="line.259"></a>
<FONT color="green">260</FONT>          if (codec == null) {<a name="line.260"></a>
<FONT color="green">261</FONT>            return null;<a name="line.261"></a>
<FONT color="green">262</FONT>          }<a name="line.262"></a>
<FONT color="green">263</FONT>          return codec.getClass();<a name="line.263"></a>
<FONT color="green">264</FONT>        }<a name="line.264"></a>
<FONT color="green">265</FONT>    <a name="line.265"></a>
<FONT color="green">266</FONT>      /**<a name="line.266"></a>
<FONT color="green">267</FONT>       * Removes a suffix from a filename, if it has it.<a name="line.267"></a>
<FONT color="green">268</FONT>       * @param filename the filename to strip<a name="line.268"></a>
<FONT color="green">269</FONT>       * @param suffix the suffix to remove<a name="line.269"></a>
<FONT color="green">270</FONT>       * @return the shortened filename<a name="line.270"></a>
<FONT color="green">271</FONT>       */<a name="line.271"></a>
<FONT color="green">272</FONT>      public static String removeSuffix(String filename, String suffix) {<a name="line.272"></a>
<FONT color="green">273</FONT>        if (filename.endsWith(suffix)) {<a name="line.273"></a>
<FONT color="green">274</FONT>          return filename.substring(0, filename.length() - suffix.length());<a name="line.274"></a>
<FONT color="green">275</FONT>        }<a name="line.275"></a>
<FONT color="green">276</FONT>        return filename;<a name="line.276"></a>
<FONT color="green">277</FONT>      }<a name="line.277"></a>
<FONT color="green">278</FONT>      <a name="line.278"></a>
<FONT color="green">279</FONT>      /**<a name="line.279"></a>
<FONT color="green">280</FONT>       * A little test program.<a name="line.280"></a>
<FONT color="green">281</FONT>       * @param args<a name="line.281"></a>
<FONT color="green">282</FONT>       */<a name="line.282"></a>
<FONT color="green">283</FONT>      public static void main(String[] args) throws Exception {<a name="line.283"></a>
<FONT color="green">284</FONT>        Configuration conf = new Configuration();<a name="line.284"></a>
<FONT color="green">285</FONT>        CompressionCodecFactory factory = new CompressionCodecFactory(conf);<a name="line.285"></a>
<FONT color="green">286</FONT>        boolean encode = false;<a name="line.286"></a>
<FONT color="green">287</FONT>        for(int i=0; i &lt; args.length; ++i) {<a name="line.287"></a>
<FONT color="green">288</FONT>          if ("-in".equals(args[i])) {<a name="line.288"></a>
<FONT color="green">289</FONT>            encode = true;<a name="line.289"></a>
<FONT color="green">290</FONT>          } else if ("-out".equals(args[i])) {<a name="line.290"></a>
<FONT color="green">291</FONT>            encode = false;<a name="line.291"></a>
<FONT color="green">292</FONT>          } else {<a name="line.292"></a>
<FONT color="green">293</FONT>            CompressionCodec codec = factory.getCodec(new Path(args[i]));<a name="line.293"></a>
<FONT color="green">294</FONT>            if (codec == null) {<a name="line.294"></a>
<FONT color="green">295</FONT>              System.out.println("Codec for " + args[i] + " not found.");<a name="line.295"></a>
<FONT color="green">296</FONT>            } else { <a name="line.296"></a>
<FONT color="green">297</FONT>              if (encode) {<a name="line.297"></a>
<FONT color="green">298</FONT>                CompressionOutputStream out = null;<a name="line.298"></a>
<FONT color="green">299</FONT>                java.io.InputStream in = null;<a name="line.299"></a>
<FONT color="green">300</FONT>                try {<a name="line.300"></a>
<FONT color="green">301</FONT>                  out = codec.createOutputStream(<a name="line.301"></a>
<FONT color="green">302</FONT>                      new java.io.FileOutputStream(args[i]));<a name="line.302"></a>
<FONT color="green">303</FONT>                  byte[] buffer = new byte[100];<a name="line.303"></a>
<FONT color="green">304</FONT>                  String inFilename = removeSuffix(args[i], <a name="line.304"></a>
<FONT color="green">305</FONT>                      codec.getDefaultExtension());<a name="line.305"></a>
<FONT color="green">306</FONT>                  in = new java.io.FileInputStream(inFilename);<a name="line.306"></a>
<FONT color="green">307</FONT>                  int len = in.read(buffer);<a name="line.307"></a>
<FONT color="green">308</FONT>                  while (len &gt; 0) {<a name="line.308"></a>
<FONT color="green">309</FONT>                    out.write(buffer, 0, len);<a name="line.309"></a>
<FONT color="green">310</FONT>                    len = in.read(buffer);<a name="line.310"></a>
<FONT color="green">311</FONT>                  }<a name="line.311"></a>
<FONT color="green">312</FONT>                } finally {<a name="line.312"></a>
<FONT color="green">313</FONT>                  if(out != null) { out.close(); }<a name="line.313"></a>
<FONT color="green">314</FONT>                  if(in  != null) { in.close(); }<a name="line.314"></a>
<FONT color="green">315</FONT>                }<a name="line.315"></a>
<FONT color="green">316</FONT>              } else {<a name="line.316"></a>
<FONT color="green">317</FONT>                CompressionInputStream in = null;<a name="line.317"></a>
<FONT color="green">318</FONT>                try {<a name="line.318"></a>
<FONT color="green">319</FONT>                  in = codec.createInputStream(<a name="line.319"></a>
<FONT color="green">320</FONT>                      new java.io.FileInputStream(args[i]));<a name="line.320"></a>
<FONT color="green">321</FONT>                  byte[] buffer = new byte[100];<a name="line.321"></a>
<FONT color="green">322</FONT>                  int len = in.read(buffer);<a name="line.322"></a>
<FONT color="green">323</FONT>                  while (len &gt; 0) {<a name="line.323"></a>
<FONT color="green">324</FONT>                    System.out.write(buffer, 0, len);<a name="line.324"></a>
<FONT color="green">325</FONT>                    len = in.read(buffer);<a name="line.325"></a>
<FONT color="green">326</FONT>                  }<a name="line.326"></a>
<FONT color="green">327</FONT>                } finally {<a name="line.327"></a>
<FONT color="green">328</FONT>                  if(in != null) { in.close(); }<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>            }<a name="line.331"></a>
<FONT color="green">332</FONT>          }<a name="line.332"></a>
<FONT color="green">333</FONT>        }<a name="line.333"></a>
<FONT color="green">334</FONT>      }<a name="line.334"></a>
<FONT color="green">335</FONT>    }<a name="line.335"></a>




























































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