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Glassfish example source code file (ArrayUtil.java)

This example Glassfish source code file (ArrayUtil.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 - Glassfish tags/keywords

arrayutil, arrayutil, class, class, illegalargumentexception, object, object, reflection, suppresswarnings, t, t

The Glassfish ArrayUtil.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package org.glassfish.admin.amx.util;

import java.lang.reflect.Array;

/**
Provides:
- utility to check for equality
 */
public final class ArrayUtil
{
    private ArrayUtil()
    {
        // disallow instantiation
    }

    public static boolean arraysEqual(final Object array1, final Object array2)
    {
        boolean equal = array1 == array2;

        if (equal)
        {
            // same object or both null
            return (true);
        }
        else if (array1 == null || array2 == null)
        {
            return (false);
        }


        if (array1.getClass() == array2.getClass() &&
            ClassUtil.objectIsArray(array1) &&
            Array.getLength(array1) == Array.getLength(array2))
        {
            equal = true;
            final int length = Array.getLength(array1);

            for (int i = 0; i < length; ++i)
            {
                final Object a1 = Array.get(array1, i);
                final Object a2 = Array.get(array2, i);

                if (a1 != a2)
                {
                    if (a1 == null || a2 == null)
                    {
                        equal = false;
                    }
                    else if (ClassUtil.objectIsArray(a1))
                    {
                        if (!arraysEqual(a1, a2))
                        {
                            equal = false;
                        }
                    }
                }

                if (!equal)
                {
                    break;
                }
            }
        }

        return (equal);
    }

    public static boolean arrayContainsNulls(final Object[] array)
    {
        boolean containsNulls = false;

        for (int i = 0; i < array.length; ++i)
        {
            if (array[i] == null)
            {
                containsNulls = true;
                break;
            }
        }

        return (containsNulls);
    }

    @SuppressWarnings("unchecked")  // inherent/unavoidable for this method
    public static <T> T[] newArray(final Class theClass, int numItems)
    {
        return (T[]) (Array.newInstance(theClass, numItems));
    }

    /**
    Create a new array from the original.

    @param items		the original array
    @param startIndex	index of the first item
    @param numItems
    @return an array of the same type, containing numItems items
     */
    public static <T> T[] newArray(
            final T[] items,
            final int startIndex,
            final int numItems)
    {
        final Class<T> theClass = TypeCast.asClass(items.getClass().getComponentType());

        final T[] result = newArray(theClass, numItems);
        System.arraycopy(items, startIndex, result, 0, numItems);

        return (result);
    }

    /**
    Create a new array consisting of originals and new.

    @param items1		1st array
    @param items2		2nd array
    @return an array of the same type as items1, its elements first
     */
    public static <T> T[] newArray(
            final T[] items1,
            final T[] items2)
    {
        final Class<T> class1 = TypeCast.asClass(items1.getClass().getComponentType());
        final Class<T> class2 = TypeCast.asClass(items2.getClass().getComponentType());

        if (!class1.isAssignableFrom(class2))
        {
            throw new IllegalArgumentException();
        }

        final int length1 = Array.getLength(items1);
        final int length2 = Array.getLength(items2);
        final T[] result = newArray(class1, length1 + length2);
        System.arraycopy(items1, 0, result, 0, length1);
        System.arraycopy(items2, 0, result, length1, length2);

        return (result);
    }

    /**
    Create a new array consisting of an original array, and a single new item.

    @param items		an array
    @param item		an item to append
    @return an array of the same type as items1, its elements first
     */
    public static <T> T[] newArray(
            final T[] items,
            final T item)
    {
        final Class<T> theClass = TypeCast.asClass(items.getClass().getComponentType());
        final T[] result = newArray(theClass, items.length + 1);
        System.arraycopy(items, 0, result, 0, items.length);

        result[result.length - 1] = item;
        return (result);
    }

}

























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