IntList.java Source code

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Here is the source code for IntList.java

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/*
 * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * - Redistribution of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
 * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
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 * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
 * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
 * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed or intended for use
 * in the design, construction, operation or maintenance of any nuclear
 * facility.
 * 
 * Sun gratefully acknowledges that this software was originally authored
 * and developed by Kenneth Bradley Russell and Christopher John Kline.
 */

//package demos.util;

/** Growable array of ints. */

public class IntList {
    private static final int DEFAULT_SIZE = 10;

    private int[] data = new int[DEFAULT_SIZE];
    private int numElements;

    public void add(int f) {
        if (numElements == data.length) {
            resize(1 + numElements);
        }
        data[numElements++] = f;
        assert numElements <= data.length;
    }

    public int size() {
        return numElements;
    }

    public int get(int index) {
        if (index >= numElements) {
            throw new ArrayIndexOutOfBoundsException(index);
        }
        return data[index];
    }

    public void put(int index, int val) {
        if (index >= numElements) {
            throw new ArrayIndexOutOfBoundsException(index);
        }
        data[index] = val;
    }

    public void trim() {
        if (data.length > numElements) {
            int[] newData = new int[numElements];
            System.arraycopy(data, 0, newData, 0, numElements);
            data = newData;
        }
    }

    public int[] getData() {
        return data;
    }

    private void resize(int minCapacity) {
        int newCapacity = 2 * data.length;
        if (newCapacity == 0) {
            newCapacity = DEFAULT_SIZE;
        }
        if (newCapacity < minCapacity) {
            newCapacity = minCapacity;
        }
        int[] newData = new int[newCapacity];
        System.arraycopy(data, 0, newData, 0, data.length);
        data = newData;
    }
}