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/*
* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.javac.file;
import com.sun.tools.javac.file.RelativePath.RelativeDirectory;
import com.sun.tools.javac.util.Context;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/** A cache for ZipFileIndex objects. */
public class ZipFileIndexCache {
private final Map map =
new HashMap();
/** Get a shared instance of the cache. */
private static ZipFileIndexCache sharedInstance;
public synchronized static ZipFileIndexCache getSharedInstance() {
if (sharedInstance == null)
sharedInstance = new ZipFileIndexCache();
return sharedInstance;
}
/** Get a context-specific instance of a cache. */
public static ZipFileIndexCache instance(Context context) {
ZipFileIndexCache instance = context.get(ZipFileIndexCache.class);
if (instance == null)
context.put(ZipFileIndexCache.class, instance = new ZipFileIndexCache());
return instance;
}
/**
* Returns a list of all ZipFileIndex entries
*
* @return A list of ZipFileIndex entries, or an empty list
*/
public List getZipFileIndexes() {
return getZipFileIndexes(false);
}
/**
* Returns a list of all ZipFileIndex entries
*
* @param openedOnly If true it returns a list of only opened ZipFileIndex entries, otherwise
* all ZipFileEntry(s) are included into the list.
* @return A list of ZipFileIndex entries, or an empty list
*/
public synchronized List getZipFileIndexes(boolean openedOnly) {
List zipFileIndexes = new ArrayList();
zipFileIndexes.addAll(map.values());
if (openedOnly) {
for(ZipFileIndex elem : zipFileIndexes) {
if (!elem.isOpen()) {
zipFileIndexes.remove(elem);
}
}
}
return zipFileIndexes;
}
public synchronized ZipFileIndex getZipFileIndex(File zipFile,
RelativeDirectory symbolFilePrefix,
boolean useCache, String cacheLocation,
boolean writeIndex) throws IOException {
ZipFileIndex zi = getExistingZipIndex(zipFile);
if (zi == null || (zi != null && zipFile.lastModified() != zi.zipFileLastModified)) {
zi = new ZipFileIndex(zipFile, symbolFilePrefix, writeIndex,
useCache, cacheLocation);
map.put(zipFile, zi);
}
return zi;
}
public synchronized ZipFileIndex getExistingZipIndex(File zipFile) {
return map.get(zipFile);
}
public synchronized void clearCache() {
map.clear();
}
public synchronized void clearCache(long timeNotUsed) {
Iterator cachedFileIterator = map.keySet().iterator();
while (cachedFileIterator.hasNext()) {
File cachedFile = cachedFileIterator.next();
ZipFileIndex cachedZipIndex = map.get(cachedFile);
if (cachedZipIndex != null) {
long timeToTest = cachedZipIndex.lastReferenceTimeStamp + timeNotUsed;
if (timeToTest < cachedZipIndex.lastReferenceTimeStamp || // Overflow...
System.currentTimeMillis() > timeToTest) {
map.remove(cachedFile);
}
}
}
}
public synchronized void removeFromCache(File file) {
map.remove(file);
}
/** Sets already opened list of ZipFileIndexes from an outside client
* of the compiler. This functionality should be used in a non-batch clients of the compiler.
*/
public synchronized void setOpenedIndexes(Listindexes) throws IllegalStateException {
if (map.isEmpty()) {
String msg =
"Setting opened indexes should be called only when the ZipFileCache is empty. "
+ "Call JavacFileManager.flush() before calling this method.";
throw new IllegalStateException(msg);
}
for (ZipFileIndex zfi : indexes) {
map.put(zfi.zipFile, zfi);
}
}
}