get last element of the target element - Android java.lang

Android examples for java.lang:Array Element

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Description

get last element of the target element

Demo Code



public class Main{
    /**//from   w ww  .  j a  v a  2  s  .co  m
     * get last element of the target element, before the first one that match the target element front to back
     * <ul>
     * <li>if array is empty, return defaultValue</li>
     * <li>if target element is not exist in array, return defaultValue</li>
     * <li>if target element exist in array and its index is not 0, return the last element</li>
     * <li>if target element exist in array and its index is 0, return the last one in array if isCircle is true, else
     * return defaultValue</li>
     * </ul>
     * 
     * @param <V>
     * @param sourceArray
     * @param value value of target element
     * @param defaultValue default return value
     * @param isCircle whether is circle
     * @return
     */
    public static <V> V getLast(V[] sourceArray, V value, V defaultValue,
            boolean isCircle) {
        if (isEmpty(sourceArray)) {
            return defaultValue;
        }

        int currentPosition = -1;
        for (int i = 0; i < sourceArray.length; i++) {
            if (ObjectUtils.isEquals(value, sourceArray[i])) {
                currentPosition = i;
                break;
            }
        }
        if (currentPosition == -1) {
            return defaultValue;
        }

        if (currentPosition == 0) {
            return isCircle ? sourceArray[sourceArray.length - 1]
                    : defaultValue;
        }
        return sourceArray[currentPosition - 1];
    }
    /**
     * @see {@link ArrayUtils#getLast(Object[], Object, Object, boolean)} defaultValue is null
     */
    public static <V> V getLast(V[] sourceArray, V value, boolean isCircle) {
        return getLast(sourceArray, value, null, isCircle);
    }
    /**
     * @see {@link ArrayUtils#getLast(Object[], Object, Object, boolean)} Object is Long
     */
    public static long getLast(long[] sourceArray, long value,
            long defaultValue, boolean isCircle) {
        if (sourceArray.length == 0) {
            throw new IllegalArgumentException(
                    "The length of source array must be greater than 0.");
        }

        Long[] array = ObjectUtils.transformLongArray(sourceArray);
        return getLast(array, value, defaultValue, isCircle);

    }
    /**
     * @see {@link ArrayUtils#getLast(Object[], Object, Object, boolean)} Object is Integer
     */
    public static int getLast(int[] sourceArray, int value,
            int defaultValue, boolean isCircle) {
        if (sourceArray.length == 0) {
            throw new IllegalArgumentException(
                    "The length of source array must be greater than 0.");
        }

        Integer[] array = ObjectUtils.transformIntArray(sourceArray);
        return getLast(array, value, defaultValue, isCircle);

    }
    /**
     * is null or its length is 0
     * 
     * @param <V>
     * @param sourceArray
     * @return
     */
    public static <V> boolean isEmpty(V[] sourceArray) {
        return (sourceArray == null || sourceArray.length == 0);
    }
}

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