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Ant example source code file (IdentityStack.java)

This example Ant source code file (IdentityStack.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

identitystack, identitystack, stack, stack, util

The IdentityStack.java source code

/*
 *  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.Stack;

/**
 * Identity Stack.
 * @since Ant 1.7
 */
public class IdentityStack extends Stack {

    /**
     * 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 IdentityStack getInstance(Stack s) {
        if (s instanceof IdentityStack) {
            return (IdentityStack) s;
        }
        IdentityStack result = new IdentityStack();
        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(Object o) {
        super();
        push(o);
    }

    /**
     * Override methods that use <code>.equals() 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() 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) {
        for (int i = pos; i < size(); i++) {
            if (get(i) == o) {
                return i;
            }
        }
        return -1;
    }

    /**
     * Override methods that use <code>.equals() 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;
    }

}

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