/*
* Copyright 2010 the original author or authors.
*
* 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 org.gradle.api.internal.artifacts;
import org.gradle.api.file.FileCollection;
import org.gradle.api.internal.CachingDirectedGraphWalker;
import org.gradle.api.internal.DirectedGraph;
import org.gradle.api.internal.file.UnionFileCollection;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
public class CachingDependencyResolveContext implements DependencyResolveContext {
private final List<Object> queue = new ArrayList<Object>();
private final CachingDirectedGraphWalker<Object, FileCollection> walker
= new CachingDirectedGraphWalker<Object, FileCollection>(new DependencyGraph());
private final boolean transitive;
public CachingDependencyResolveContext(boolean transitive) {
this.transitive = transitive;
}
public boolean isTransitive() {
return transitive;
}
public FileCollection resolve() {
try {
walker.add(queue);
return new UnionFileCollection(walker.findValues());
} finally {
queue.clear();
}
}
public void add(Object dependency) {
queue.add(dependency);
}
private class DependencyGraph implements DirectedGraph<Object, FileCollection> {
public void getNodeValues(Object node, Collection<FileCollection> values, Collection<Object> connectedNodes) {
if (node instanceof FileCollection) {
FileCollection fileCollection = (FileCollection) node;
values.add(fileCollection);
}
else if (node instanceof DependencyInternal) {
DependencyInternal dependencyInternal = (DependencyInternal) node;
queue.clear();
dependencyInternal.resolve(CachingDependencyResolveContext.this);
connectedNodes.addAll(queue);
queue.clear();
}
else {
throw new IllegalArgumentException(String.format("Cannot resolve object of unknown type %s.", node.getClass().getSimpleName()));
}
}
}
}