| /* |
| * 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. |
| * |
| */ |
| package org.apache.tools.ant.taskdefs.optional.depend; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.zip.ZipEntry; |
| import java.util.zip.ZipInputStream; |
| |
| /** |
| * A class file iterator which iterates through the contents of a Java jar |
| * file. |
| * |
| */ |
| public class JarFileIterator implements ClassFileIterator { |
| /** The jar stream from the jar file being iterated over*/ |
| private ZipInputStream jarStream; |
| |
| /** |
| * Construct an iterator over a jar stream |
| * |
| * @param stream the basic input stream from which the Jar is received |
| * @exception IOException if the jar stream cannot be created |
| */ |
| public JarFileIterator(InputStream stream) throws IOException { |
| super(); |
| |
| jarStream = new ZipInputStream(stream); |
| } |
| |
| /** |
| * Get the next ClassFile object from the jar |
| * |
| * @return a ClassFile object describing the class from the jar |
| */ |
| public ClassFile getNextClassFile() { |
| ZipEntry jarEntry; |
| ClassFile nextElement = null; |
| |
| try { |
| jarEntry = jarStream.getNextEntry(); |
| |
| while (nextElement == null && jarEntry != null) { |
| String entryName = jarEntry.getName(); |
| |
| if (!jarEntry.isDirectory() && entryName.endsWith(".class")) { |
| |
| // create a data input stream from the jar input stream |
| ClassFile javaClass = new ClassFile(); |
| |
| javaClass.read(jarStream); |
| |
| nextElement = javaClass; |
| } else { |
| |
| jarEntry = jarStream.getNextEntry(); |
| } |
| } |
| } catch (IOException e) { |
| String message = e.getMessage(); |
| String text = e.getClass().getName(); |
| |
| if (message != null) { |
| text += ": " + message; |
| } |
| |
| throw new RuntimeException("Problem reading JAR file: " + text); |
| } |
| |
| return nextElement; |
| } |
| |
| } |
| |