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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.tools.ant.types.resources.comparators;
import java.util.Iterator;
import java.util.List;
import java.util.Stack;
import java.util.Vector;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.types.DataType;
import org.apache.tools.ant.types.Resource;
/**
* Delegates to other ResourceComparators or, if none specified,
* uses Resources' natural ordering.
* @since Ant 1.7
*/
public class DelegatedResourceComparator extends ResourceComparator {
private List<ResourceComparator> resourceComparators = null;
/**
* Add a delegate ResourceComparator.
* @param c the next delegate ResourceComparator.
*/
public synchronized void add(ResourceComparator c) {
if (isReference()) {
throw noChildrenAllowed();
}
if (c == null) {
return;
}
resourceComparators = (resourceComparators == null) ? new Vector<ResourceComparator>() : resourceComparators;
resourceComparators.add(c);
setChecked(false);
}
/**
* Equality method based on the vector of resources,
* or if a reference, the referredto object.
* @param o the object to check against.
* @return true if there is equality.
*/
public synchronized boolean equals(Object o) {
if (o == this) {
return true;
}
if (isReference()) {
return getCheckedRef().equals(o);
}
if (!(o instanceof DelegatedResourceComparator)) {
return false;
}
List<ResourceComparator> ov = ((DelegatedResourceComparator) o).resourceComparators;
return resourceComparators == null ? ov == null : resourceComparators.equals(ov);
}
/**
* Hashcode based on the rules for equality.
* @return a hashcode.
*/
public synchronized int hashCode() {
if (isReference()) {
return getCheckedRef().hashCode();
}
return resourceComparators == null ? 0 : resourceComparators.hashCode();
}
/** {@inheritDoc} */
protected synchronized int resourceCompare(Resource foo, Resource bar) {
//if no nested, natural order:
if (resourceComparators == null || resourceComparators.isEmpty()) {
return foo.compareTo(bar);
}
int result = 0;
for (Iterator<ResourceComparator> i = resourceComparators.iterator(); result == 0 && i.hasNext();) {
result = i.next().resourceCompare(foo, bar);
}
return result;
}
/**
* Overrides the version from DataType to recurse on nested ResourceSelector
s.
* @param stk the Stack of references.
* @param p the Project to resolve against.
* @throws BuildException on error.
*/
protected void dieOnCircularReference(Stack<Object> stk, Project p)
throws BuildException {
if (isChecked()) {
return;
}
if (isReference()) {
super.dieOnCircularReference(stk, p);
} else {
if (!(resourceComparators == null || resourceComparators.isEmpty())) {
for (ResourceComparator resourceComparator : resourceComparators) {
if (resourceComparator instanceof DataType) {
pushAndInvokeCircularReferenceCheck((DataType) resourceComparator, stk,
p);
}
}
}
setChecked(true);
}
}
}
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