| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.compiler.batch; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.Enumeration; |
| import java.util.Hashtable; |
| import java.util.zip.ZipEntry; |
| import java.util.zip.ZipFile; |
| |
| import org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader; |
| import org.eclipse.jdt.internal.compiler.env.NameEnvironmentAnswer; |
| |
| public class ClasspathJar implements FileSystem.Classpath { |
| |
| ZipFile zipFile; |
| Hashtable packageCache; |
| boolean closeZipFileAtEnd; |
| |
| public ClasspathJar(File file) throws IOException { |
| this(new ZipFile(file), true); |
| } |
| public ClasspathJar(ZipFile zipFile, boolean closeZipFileAtEnd) throws IOException { |
| this.zipFile = zipFile; |
| this.packageCache = null; |
| this.closeZipFileAtEnd = closeZipFileAtEnd; |
| } |
| public NameEnvironmentAnswer findClass(char[] typeName, String qualifiedPackageName, String qualifiedBinaryFileName) { |
| if (!isPackage(qualifiedPackageName)) |
| return null; // most common case |
| |
| try { |
| ClassFileReader reader = ClassFileReader.read(zipFile, qualifiedBinaryFileName); |
| if (reader != null) return new NameEnvironmentAnswer(reader); |
| } catch (Exception e) {} // treat as if class file is missing |
| return null; |
| } |
| public boolean isPackage(String qualifiedPackageName) { |
| if (packageCache != null) |
| return packageCache.containsKey(qualifiedPackageName); |
| |
| this.packageCache = new Hashtable(41); |
| packageCache.put("", ""); //$NON-NLS-1$ //$NON-NLS-2$ |
| |
| nextEntry : for (Enumeration e = zipFile.entries(); e.hasMoreElements(); ) { |
| String fileName = ((ZipEntry) e.nextElement()).getName(); |
| |
| // add the package name & all of its parent packages |
| int last = fileName.lastIndexOf('/'); |
| while (last > 0) { |
| // extract the package name |
| String packageName = fileName.substring(0, last); |
| if (packageCache.containsKey(packageName)) |
| continue nextEntry; |
| packageCache.put(packageName, packageName); |
| last = packageName.lastIndexOf('/'); |
| } |
| } |
| return packageCache.containsKey(qualifiedPackageName); |
| } |
| public void reset() { |
| if (zipFile != null && closeZipFileAtEnd) { |
| try { zipFile.close(); } catch(IOException e) {} |
| } |
| this.packageCache = null; |
| } |
| public String toString() { |
| return "Classpath for jar file " + zipFile.getName(); //$NON-NLS-1$ |
| } |
| } |