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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.util;
import java.util.Collection;
import java.util.HashSet;
import java.util.IdentityHashMap;
import java.util.Set;
import java.util.Stack;
/**
* Identity Stack.
* @since Ant 1.7
*/
public class IdentityStack<E> extends Stack<E> {
private static final long serialVersionUID = -5555522620060077046L;
/**
* Get an IdentityStack containing the contents of the specified Stack.
* @param s the Stack to copy; ignored if null.
* @return an IdentityStack instance.
*/
public static <E> IdentityStack<E> getInstance(Stack<E> s) {
if (s instanceof IdentityStack) {
return (IdentityStack<E>) s;
}
IdentityStack<E> result = new IdentityStack<E>();
if (s != null) {
result.addAll(s);
}
return result;
}
/**
* Default constructor.
*/
public IdentityStack() {
}
/**
* Construct a new IdentityStack with the specified Object
* as the bottom element.
* @param o the bottom element.
*/
public IdentityStack(E o) {
super();
push(o);
}
/**
* Override methods that use <code>.equals()</code> comparisons on elements.
* @param o the Object to search for.
* @return true if the stack contains the object.
* @see java.util.Vector#contains(Object)
*/
public synchronized boolean contains(Object o) {
return indexOf(o) >= 0;
}
/**
* Override methods that use <code>.equals()</code> comparisons on elements.
* @param o the Object to search for.
* @param pos the position from which to search.
* @return the position of the object, -1 if not found.
* @see java.util.Vector#indexOf(Object, int)
*/
public synchronized int indexOf(Object o, int pos) {
final int size = size();
for (int i = pos; i < size; i++) {
if (get(i) == o) {
return i;
}
}
return -1;
}
/**
* Override methods that use <code>.equals()</code> comparisons on elements.
* @param o the Object to search for.
* @param pos the position from which to search (backward).
* @return the position of the object, -1 if not found.
* @see java.util.Vector#indexOf(Object, int)
*/
public synchronized int lastIndexOf(Object o, int pos) {
for (int i = pos; i >= 0; i--) {
if (get(i) == o) {
return i;
}
}
return -1;
}
public synchronized boolean removeAll(Collection<?> c) {
if (!(c instanceof Set)) {
c = new HashSet(c);
}
return super.removeAll(c);
}
public synchronized boolean retainAll(Collection c) {
if (!(c instanceof Set)) {
c = new HashSet(c);
}
return super.retainAll(c);
}
public synchronized boolean containsAll(Collection<?> c) {
IdentityHashMap map = new IdentityHashMap();
for (Object e : this) {
map.put(e, Boolean.TRUE);
}
return map.keySet().containsAll(c);
}
}
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