130 lines
3.3 KiB
Java
130 lines
3.3 KiB
Java
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/*******************************************************************************
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* Copyright (c) 2002 - 2006 IBM Corporation.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package com.ibm.wala.classLoader;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Enumeration;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.jar.JarFile;
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import java.util.zip.ZipEntry;
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import com.ibm.wala.util.CacheReference;
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import com.ibm.wala.util.collections.HashMapFactory;
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import com.ibm.wala.util.collections.HashSetFactory;
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import com.ibm.wala.util.debug.Assertions;
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/**
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*
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* A module which is a wrapper around a Jar file
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*
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* @author sfink
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*/
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public class JarFileModule implements Module {
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private final JarFile file;
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/**
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* For efficiency, try to cache the byte[] holding each ZipEntries contents;
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* this will help avoid multiple unzipping
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*/
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private final HashMap<ZipEntry, Object> cache = HashMapFactory.make();
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public JarFileModule(JarFile f) {
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this.file = f;
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}
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public String getAbsolutePath() {
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return file.getName();
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}
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/*
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* (non-Javadoc)
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*
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* @see java.lang.Object#toString()
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*/
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public String toString() {
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return "JarFileModule:" + file.getName();
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}
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/*
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* (non-Javadoc)
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*
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* @see com.ibm.wala.classLoader.Module#getEntries()
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*/
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public Iterator<ModuleEntry> getEntries() {
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HashSet<ModuleEntry> result = HashSetFactory.make();
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for (Enumeration e = file.entries(); e.hasMoreElements();) {
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ZipEntry Z = (ZipEntry) e.nextElement();
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result.add(new JarFileEntry(Z.getName(), this));
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}
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return result.iterator();
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}
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/*
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* (non-Javadoc)
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*
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* @see java.lang.Object#hashCode()
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*/
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public int hashCode() {
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return file.hashCode();
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}
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/*
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* (non-Javadoc)
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*
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* @see java.lang.Object#equals(java.lang.Object)
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*/
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public boolean equals(Object arg0) {
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if (getClass().equals(arg0.getClass())) {
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JarFileModule other = (JarFileModule) arg0;
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return file.equals(other.file);
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} else {
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return false;
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}
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}
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public byte[] getContents(ZipEntry entry) {
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byte[] b = (byte[]) CacheReference.get(cache.get(entry));
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if (b != null) {
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return b;
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}
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try {
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InputStream s = file.getInputStream(entry);
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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b = new byte[1024];
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int n = s.read(b);
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while (n != -1) {
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out.write(b, 0, n);
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n = s.read(b);
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}
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byte[] bb = out.toByteArray();
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cache.put(entry, CacheReference.make(bb));
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s.close();
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return bb;
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} catch (IOException e) {
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e.printStackTrace();
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Assertions.UNREACHABLE();
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return null;
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}
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}
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public JarFile getJarFile() {
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return file;
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}
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}
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