Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * 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<File, ZipFileIndex> map =

             new HashMap<File, ZipFileIndex>();

     /** 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<ZipFileIndex> 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<ZipFileIndex> getZipFileIndexes(boolean openedOnly) {

         List<ZipFileIndex> zipFileIndexes = new ArrayList<ZipFileIndex>();

         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<File> 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(List<ZipFileIndex>indexes) 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);

         }

     }

 }