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/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* 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.intellij.util.lang;
import com.intellij.openapi.util.io.FileUtil;
import com.intellij.util.io.zip.ZipShort;
import gnu.trove.THashMap;
import org.jetbrains.annotations.Nullable;
import sun.misc.Resource;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
/**
* @author Dmitry Avdeev
* @since 12/07/2011
*/
public class JarMemoryLoader {
public static final String SIZE_ENTRY = "META-INF/jb/$$size$$";
private final Map<String, Resource> myResources = new THashMap<String, Resource>();
private JarMemoryLoader() { }
public Resource getResource(String entryName) {
return myResources.remove(entryName);
}
@Nullable
public static JarMemoryLoader load(File file, URL baseUrl) throws IOException {
ZipFile zipFile = new ZipFile(file);
try {
return load(zipFile, baseUrl);
}
finally {
zipFile.close();
}
}
@Nullable
public static JarMemoryLoader load(ZipFile zipFile, URL baseUrl) throws IOException {
Enumeration<? extends ZipEntry> entries = zipFile.entries();
if (!entries.hasMoreElements()) return null;
ZipEntry sizeEntry = entries.nextElement();
if (sizeEntry == null || !sizeEntry.getName().equals(SIZE_ENTRY)) return null;
byte[] bytes = FileUtil.loadBytes(zipFile.getInputStream(sizeEntry), 2);
int size = ZipShort.getValue(bytes);
JarMemoryLoader loader = new JarMemoryLoader();
for (int i = 0; i < size && entries.hasMoreElements(); i++) {
ZipEntry entry = entries.nextElement();
MemoryResource resource = MemoryResource.load(baseUrl, zipFile, entry);
loader.myResources.put(entry.getName(), resource);
}
return loader;
}
}
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