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/*
* Copyright 2008 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.gwt.dev.resource.impl;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.dev.util.collect.IdentityHashMap;
import com.google.gwt.dev.util.collect.IdentityHashSet;
import com.google.gwt.dev.util.collect.IdentityMaps;
import com.google.gwt.dev.util.collect.Sets;
import com.google.gwt.dev.util.msg.Message1String;
import com.google.gwt.thirdparty.guava.common.collect.MapMaker;
import com.google.gwt.thirdparty.guava.common.collect.Maps;
import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Map;
import java.util.Set;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
/**
* A classpath entry that is a jar or zip file.
*/
public class ZipFileClassPathEntry extends ClassPathEntry {
/**
* Logger messages related to this class.
*/
private static class Messages {
static final Message1String BUILDING_INDEX = new Message1String(
TreeLogger.TRACE, "Indexing zip file: $0");
static final Message1String EXCLUDING_RESOURCE = new Message1String(
TreeLogger.DEBUG, "Excluding $0");
static final Message1String FINDING_INCLUDED_RESOURCES = new Message1String(
TreeLogger.DEBUG, "Searching for included resources in $0");
static final Message1String INCLUDING_RESOURCE = new Message1String(
TreeLogger.DEBUG, "Including $0");
static final Message1String READ_ZIP_ENTRY = new Message1String(
TreeLogger.DEBUG, "$0");
}
private static class ZipFileSnapshot {
private final Map cachedAnswers;
private final int prefixSetSize;
ZipFileSnapshot(int prefixSetSize,
Map cachedAnswers) {
this.prefixSetSize = prefixSetSize;
this.cachedAnswers = cachedAnswers;
}
}
/**
* Memory-sensitive cache of indexed {@link ZipFileClassPathEntry}s. URI of file is most probably
* not referenced anywhere else, so we use hard reference, and soft reference on
* {@link ZipFileClassPathEntry} allows its clearing in response to memory demand.
*/
private static final Map entryCache = Maps.newHashMap();
public static void clearCache() {
entryCache.clear();
}
/**
* @return the {@link ZipFileClassPathEntry} instance for given jar or zip
* file, may be shared with other users.
*/
public static synchronized ZipFileClassPathEntry get(File zipFile) throws IOException {
String location = zipFile.toURI().toString();
ZipFileClassPathEntry entry = entryCache.get(location);
if (entry == null) {
entry = new ZipFileClassPathEntry(zipFile);
entryCache.put(location, entry);
}
return entry;
}
private Set allZipFileResources;
/**
* The lifetime of the {@link PathPrefixSet} pins the life time of the associated
* {@link ZipFileSnapshot}; this is because the {@link PathPrefixSet} is referenced from module,
* and {@link ZipFileSnapshot} is not referenced anywhere outside of {@link ZipFileClassPathEntry}
* . When the module dies, the {@link ZipFileSnapshot} needs to die also.
*/
private final Map cachedSnapshots = new MapMaker().weakKeys().makeMap();
private final long lastModified;
private final String location;
private final ZipFile zipFile;
private ZipFileClassPathEntry(File zipFile) throws IOException {
assert zipFile.isAbsolute();
this.lastModified = zipFile.lastModified();
this.zipFile = new ZipFile(zipFile);
this.location = zipFile.toURI().toString();
}
/**
* Indexes the zip file on-demand, and only once over the life of the process.
*/
@Override
public synchronized Map findApplicableResources(
TreeLogger logger, PathPrefixSet pathPrefixSet) {
index(logger);
ZipFileSnapshot snapshot = cachedSnapshots.get(pathPrefixSet);
if (snapshot == null || snapshot.prefixSetSize != pathPrefixSet.getSize()) {
snapshot = new ZipFileSnapshot(pathPrefixSet.getSize(),
computeApplicableResources(logger, pathPrefixSet));
cachedSnapshots.put(pathPrefixSet, snapshot);
}
return snapshot.cachedAnswers;
}
@Override
public String getLocation() {
return location;
}
public ZipFile getZipFile() {
return zipFile;
}
public long lastModified() {
return lastModified;
}
synchronized void index(TreeLogger logger) {
// Never re-index.
if (allZipFileResources == null) {
allZipFileResources = buildIndex(logger);
}
}
private Set buildIndex(TreeLogger logger) {
logger = Messages.BUILDING_INDEX.branch(logger, zipFile.getName(), null);
Set results = new IdentityHashSet();
Enumeration e = zipFile.entries();
while (e.hasMoreElements()) {
ZipEntry zipEntry = e.nextElement();
if (zipEntry.isDirectory()) {
// Skip directories.
continue;
}
if (zipEntry.getName().startsWith("META-INF/")) {
// Skip META-INF since classloaders normally make this invisible.
continue;
}
ZipFileResource zipResource = new ZipFileResource(this, zipEntry.getName());
results.add(zipResource);
Messages.READ_ZIP_ENTRY.log(logger, zipEntry.getName(), null);
}
return Sets.normalize(results);
}
private Map computeApplicableResources(
TreeLogger logger, PathPrefixSet pathPrefixSet) {
logger = Messages.FINDING_INCLUDED_RESOURCES.branch(logger,
zipFile.getName(), null);
Map results =
new IdentityHashMap();
for (ZipFileResource r : allZipFileResources) {
String path = r.getPath();
String[] pathParts = r.getPathParts();
ResourceResolution resourceResolution = null;
if ((resourceResolution = pathPrefixSet.includesResource(path, pathParts))
!= null) {
Messages.INCLUDING_RESOURCE.log(logger, path, null);
results.put(r, resourceResolution);
} else {
Messages.EXCLUDING_RESOURCE.log(logger, path, null);
}
}
return IdentityMaps.normalize(results);
}
}
