| /* |
| * 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.thirdparty.guava.common.collect.MapMaker; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.concurrent.ConcurrentMap; |
| |
| /** |
| * Represents a resource contained in a directory on a file system. |
| * <p>The class is immutable and automatically interned. |
| */ |
| public class FileResource extends AbstractResource { |
| /* |
| * The #equals and #hashCode is locked to work on identities by the base class Resource. |
| * Without interning, it would be impractical to use this class as a key in a map. |
| */ |
| |
| private static final ConcurrentMap<String, FileResource> canonicalFileResources = |
| new MapMaker().weakValues().makeMap(); |
| |
| public static FileResource of(String abstractPathName, File file) { |
| String key = abstractPathName + "@" + file.getAbsolutePath(); |
| FileResource sample = new FileResource(abstractPathName, file); |
| FileResource canonical = canonicalFileResources.putIfAbsent(key, sample); |
| return (canonical == null) ? sample : canonical; |
| } |
| |
| private final String abstractPathName; |
| private final File file; |
| |
| private FileResource(String abstractPathName, File file) { |
| this.abstractPathName = abstractPathName; |
| this.file = file; |
| } |
| |
| @Override |
| public long getLastModified() { |
| return file.lastModified(); |
| } |
| |
| @Override |
| public String getLocation() { |
| return file.toURI().toString(); |
| } |
| |
| @Override |
| public String getPath() { |
| return abstractPathName; |
| } |
| |
| @Override |
| public InputStream openContents() throws IOException { |
| return new FileInputStream(file); |
| } |
| } |