Android Array Copy copyArrayGrow1(Object array, Class newArrayComponentType)

Description

Returns a copy of the given array of size 1 greater than the argument.

License

Apache License

Parameter

Parameter	Description
array	The array to copy, must not be <code>null</code>.
newArrayComponentType	If <code>array</code> is <code>null</code>, create a size 1 array of this type.

Return

A new copy of the array of size 1 greater than the input.

Declaration

private static Object copyArrayGrow1(Object array,
        Class<?> newArrayComponentType) 

Method Source Code

//package com.java2s;
/*/*w w  w  .  ja  v a 2 s . c  o m*/
 * 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.
 */

import java.lang.reflect.Array;

public class Main {
    /**
     * Returns a copy of the given array of size 1 greater than the argument.
     * The last value of the array is left to the default value.
     *
     * @param array The array to copy, must not be <code>null</code>.
     * @param newArrayComponentType If <code>array</code> is <code>null</code>, create a
     * size 1 array of this type.
     * @return A new copy of the array of size 1 greater than the input.
     */
    private static Object copyArrayGrow1(Object array,
            Class<?> newArrayComponentType) {
        if (array != null) {
            int arrayLength = Array.getLength(array);
            Object newArray = Array.newInstance(array.getClass()
                    .getComponentType(), arrayLength + 1);
            System.arraycopy(array, 0, newArray, 0, arrayLength);
            return newArray;
        }
        return Array.newInstance(newArrayComponentType, 1);
    }

    /**
     * <p>Returns the length of the specified array.
     * This method can deal with <code>Object</code> arrays and with primitive arrays.</p>
     *
     * <p>If the input array is <code>null</code>, <code>0</code> is returned.</p>
     *
     * <pre>
     * ArrayUtils.getLength(null)            = 0
     * ArrayUtils.getLength([])              = 0
     * ArrayUtils.getLength([null])          = 1
     * ArrayUtils.getLength([true, false])   = 2
     * ArrayUtils.getLength([1, 2, 3])       = 3
     * ArrayUtils.getLength(["a", "b", "c"]) = 3
     * </pre>
     *
     * @param array  the array to retrieve the length from, may be null
     * @return The length of the array, or <code>0</code> if the array is <code>null</code>
     * @throws IllegalArgumentException if the object arguement is not an array.
     * @since 2.1
     */
    public static int getLength(Object array) {
        if (array == null) {
            return 0;
        }
        return Array.getLength(array);
    }
}

Related

1. arraycopy(byte[] src, int src_position, byte[] dst, int dst_position, int length)
2. copy(double[] dataToCopy)
3. copyOf(Object src)
4. copyOf(String[] obj)
5. copyOf(String[] obj, int newSize)
6. copyOf(T[] original)