| package org.apache.maven.shared.jar.identification.hash; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| import org.apache.maven.shared.jar.JarAnalyzer; |
| import org.apache.maven.shared.jar.JarData; |
| import org.codehaus.plexus.digest.DigesterException; |
| import org.codehaus.plexus.digest.StreamingDigester; |
| import org.codehaus.plexus.logging.AbstractLogEnabled; |
| import org.apache.maven.shared.utils.io.IOUtil; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.List; |
| import java.util.jar.JarEntry; |
| |
| /** |
| * Analyzer that calculates the hash code for the entire file. Can be used to detect an exact copy of the file's class |
| * data. Useful to see thru a recompile, recompression, or timestamp change. |
| * <p/> |
| * If you are not using Plexus, you must call {@link #setDigester(org.codehaus.plexus.digest.StreamingDigester)} before |
| * use |
| * |
| * @plexus.component role="org.apache.maven.shared.jar.identification.hash.JarHashAnalyzer" role-hint="bytecode" |
| */ |
| public class JarBytecodeHashAnalyzer |
| extends AbstractLogEnabled |
| implements JarHashAnalyzer |
| { |
| /** |
| * The streaming digester to use for computing the hash. Under Plexus, the default is SHA-1. |
| * |
| * @plexus.requirement role-hint="sha1" |
| */ |
| private StreamingDigester digester; |
| |
| public String computeHash( JarAnalyzer jarAnalyzer ) |
| { |
| JarData jarData = jarAnalyzer.getJarData(); |
| |
| String result = jarData.getBytecodeHash(); |
| if ( result == null ) |
| { |
| List<JarEntry> entries = jarAnalyzer.getClassEntries(); |
| |
| try |
| { |
| digester.reset(); |
| for ( JarEntry entry : entries ) |
| { |
| computeEntryBytecodeHash( jarAnalyzer.getEntryInputStream( entry ) ); |
| } |
| result = digester.calc(); |
| jarData.setBytecodeHash( result ); |
| } |
| catch ( DigesterException e ) |
| { |
| getLogger().warn( "Unable to calculate the hashcode.", e ); |
| } |
| catch ( IOException e ) |
| { |
| getLogger().warn( "Unable to calculate the hashcode.", e ); |
| } |
| } |
| return result; |
| } |
| |
| private void computeEntryBytecodeHash( InputStream is ) |
| throws IOException, DigesterException |
| { |
| try |
| { |
| digester.update( is ); |
| } |
| finally |
| { |
| IOUtil.close( is ); |
| } |
| } |
| |
| public void setDigester( StreamingDigester digester ) |
| { |
| this.digester = digester; |
| } |
| } |