com.google.gwt.dev.cfg.CombinedResourceOracle Maven / Gradle / Ivy
/*
* Copyright 2013 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.cfg;
import com.google.gwt.dev.resource.Resource;
import com.google.gwt.dev.resource.ResourceOracle;
import com.google.gwt.thirdparty.guava.common.collect.ImmutableSet;
import com.google.gwt.thirdparty.guava.common.collect.Maps;
import com.google.gwt.thirdparty.guava.common.collect.Sets;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Combines multiple resource oracles into a single queryable oracle.
*
* Useful when the resource oracles being combined are very different in nature. For example one
* that surfaces resources on disk and one that surfaces resources in a set of precompiled
* libraries.
*/
public class CombinedResourceOracle implements ResourceOracle {
private Set buildResources;
private Map buildResourcesByPath;
private Set pathNames;
private List resourceOracles;
public CombinedResourceOracle(ResourceOracle... resourceOracles) {
this.resourceOracles = Arrays.asList(resourceOracles);
}
@Override
public void clear() {
throw new UnsupportedOperationException("A clear/refresh life cycle is not supported.");
}
@Override
public Set getPathNames() {
if (pathNames == null) {
pathNames = Sets.newHashSet();
for (ResourceOracle resourceOracle : resourceOracles) {
pathNames.addAll(resourceOracle.getPathNames());
}
pathNames = Collections.unmodifiableSet(pathNames);
}
return pathNames;
}
@Override
public Map getResourceMap() {
if (buildResourcesByPath == null) {
buildResourcesByPath = Maps.newHashMap();
for (ResourceOracle resourceOracle : resourceOracles) {
buildResourcesByPath.putAll(resourceOracle.getResourceMap());
}
buildResourcesByPath = Collections.unmodifiableMap(buildResourcesByPath);
}
return buildResourcesByPath;
}
@Override
public Set getResources() {
if (buildResources == null) {
buildResources = ImmutableSet. copyOf(getResourceMap().values());
}
return buildResources;
}
}