Example usage for java.lang.reflect Array getLength

Introduction

In this page you can find the example usage for java.lang.reflect Array getLength.

Prototype

@HotSpotIntrinsicCandidate
public static native int getLength(Object array) throws IllegalArgumentException;

Source Link

Document

Returns the length of the specified array object, as an int .

Usage

From source file:Main.java

public static Object[] getArray(Object val) {
    int len = Array.getLength(val);
    Object[] outputArray = new Object[len];
    for (int i = 0; i < len; ++i) {
        outputArray[i] = Array.get(val, i);
    }//from   w  ww . j a v a  2  s  .  c  om
    return outputArray;
}

From source file:Main.java

public static int getLength(Object array) {
    if (array == null)
        return 0;
    else/*from   w  w w  .  j a va  2 s  . co  m*/
        return Array.getLength(array);
}

From source file:Main.java

/**
 * Returns a duplicates of an array./* w  ww .  j  av a  2 s  . co m*/
 */
public static Object duplicateArray(Object source) {

    int size = Array.getLength(source);
    Object newarray = Array.newInstance(source.getClass().getComponentType(), size);

    System.arraycopy(source, 0, newarray, 0, size);

    return newarray;
}

From source file:Main.java

public static Object combineArray(Object firstArray, Object secondArray) {
    int firstLength = Array.getLength(firstArray);
    int secondLength = Array.getLength(secondArray);
    int length = firstLength + secondLength;

    Class<?> componentType = firstArray.getClass().getComponentType();
    Object newArray = Array.newInstance(componentType, length);
    for (int i = 0; i < length; i++) {
        if (i < firstLength) {
            Array.set(newArray, i, Array.get(firstArray, i));
        } else {/*www  .  j av  a  2s .c o  m*/
            Array.set(newArray, i, Array.get(secondArray, i - firstLength));
        }
    }
    return newArray;
}

From source file:Main.java

public static Object expand(Object a) {
    Class cl = a.getClass();/*from  ww w.ja va2 s  . co  m*/

    if (!cl.isArray()) {
        return null;
    }

    int length = Array.getLength(a);
    int newLength = length + 1; // 50% more
    Class componentType = a.getClass().getComponentType();
    Object newArray = Array.newInstance(componentType, newLength);

    System.arraycopy(a, 0, newArray, 0, length);
    return newArray;
}

From source file:Main.java

public static Object copyArray(final Object input) {
    final Class type = input.getClass();
    if (!type.isArray()) {
        throw new IllegalArgumentException();
    }//from w w w  .j a v a 2  s. co  m
    final int length = Array.getLength(input);
    final Class componentType = type.getComponentType();

    final Object result = Array.newInstance(componentType, length);
    for (int idx = 0; idx < length; idx++) {
        Array.set(result, idx, Array.get(input, idx));
    }
    return result;
}

From source file:Main.java

public static boolean isEmptyArray(Object arrayObj) {
    if (null == arrayObj) {
        return true;
    }/*from  w w  w . ja  va2  s  . c om*/

    Class clazz = arrayObj.getClass();

    if (!clazz.isArray()) {
        return true;
    }

    if (Array.getLength(arrayObj) == 0) {
        return true;
    }

    return false;
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> List<T> getList(Object... items) {
    List<T> list = new ArrayList<T>();
    if (items.length == 1 && items[0].getClass().isArray()) {
        int length = Array.getLength(items[0]);
        for (int i = 0; i < length; i++) {
            Object element = Array.get(items[0], i);
            T item = (T) element;/*from w w w  .j  a v a 2 s.  co  m*/
            list.add(item);
        }
    } else {
        for (Object i : items) {
            T item = (T) i;
            list.add(item);
        }
    }
    return list;
}

From source file:ArrayEnumerationFactory.java

static public Enumeration makeEnumeration(final Object obj) {
    Class type = obj.getClass();/*w  w  w  .ja  v a  2 s .c  o m*/
    if (!type.isArray()) {
        throw new IllegalArgumentException(obj.getClass().toString());
    } else {
        return (new Enumeration() {
            int size = Array.getLength(obj);

            int cursor;

            public boolean hasMoreElements() {
                return (cursor < size);
            }

            public Object nextElement() {
                return Array.get(obj, cursor++);
            }
        });
    }
}

From source file:Main.java

/**
 * Returns the given array if newsize is the same as existing.
 * Returns a new array of given size, containing as many elements of
 * the original array as it can hold.//w  ww .j  a  v  a  2  s. co  m
 */
public static Object resizeArrayIfDifferent(Object source, int newsize) {

    int oldsize = Array.getLength(source);

    if (oldsize == newsize) {
        return source;
    }

    Object newarray = Array.newInstance(source.getClass().getComponentType(), newsize);

    if (oldsize < newsize) {
        newsize = oldsize;
    }

    System.arraycopy(source, 0, newarray, 0, newsize);

    return newarray;
}