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/*
* Copyright (C) 2010 Google Inc.
*
* Licensed 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 com.google.doclava;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
public class JarUtils {
/**
* Returns the jar file used to load class clazz, or defaultJar if clazz was not loaded from a
* jar.
*/
public static JarFile jarForClass(Class<?> clazz, JarFile defaultJar) {
String path = "/" + clazz.getName().replace('.', '/') + ".class";
URL jarUrl = clazz.getResource(path);
if (jarUrl == null) {
return defaultJar;
}
String url = jarUrl.toString();
int bang = url.indexOf("!");
String JAR_URI_PREFIX = "jar:file:";
if (url.startsWith(JAR_URI_PREFIX) && bang != -1) {
try {
return new JarFile(url.substring(JAR_URI_PREFIX.length(), bang));
} catch (IOException e) {
throw new IllegalStateException("Error loading jar file.", e);
}
} else {
return defaultJar;
}
}
/**
* Copies a directory from a jar file to an external directory.
*/
public static void copyResourcesToDirectory(JarFile fromJar, String jarDir, String destDir)
throws IOException {
for (Enumeration<JarEntry> entries = fromJar.entries(); entries.hasMoreElements();) {
JarEntry entry = entries.nextElement();
if (entry.getName().startsWith(jarDir + "/") && !entry.isDirectory()) {
File dest = new File(destDir + "/" + entry.getName().substring(jarDir.length() + 1));
File parent = dest.getParentFile();
if (parent != null) {
parent.mkdirs();
}
FileOutputStream out = new FileOutputStream(dest);
InputStream in = fromJar.getInputStream(entry);
try {
byte[] buffer = new byte[8 * 1024];
int s = 0;
while ((s = in.read(buffer)) > 0) {
out.write(buffer, 0, s);
}
} catch (IOException e) {
throw new IOException("Could not copy asset from jar file", e);
} finally {
try {
in.close();
} catch (IOException ignored) {}
try {
out.close();
} catch (IOException ignored) {}
}
}
}
}
private JarUtils() {} // non-instantiable
}
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