org.mozilla.javascript.arrays.ExternalUnsignedShortArray Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of rhino Show documentation

The Rhino JavaScript Engine for Java

The newest version!

/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.javascript.arrays;

import java.nio.ShortBuffer;

/**
 * An implementation of the external array using an array of "short"s. From a JavaScript perspective,
 * only "number" types may be set in the array. Valid values are between 0 and 65536, inclusive. Negative values
 * will be converted to unsigned "number" objects when accessed from JavaScript, whereas in Java, values
 * must be treated as "short" instances.
 * position() of the specified array will be used for the first object in the array, and "remaining()" will
 * be used to determine the length.
 */

public final class ExternalUnsignedShortArray
    extends ExternalArray
{
    private static final long serialVersionUID = -5341065722456287177L;

    private final ShortBuffer array;

    public ExternalUnsignedShortArray(ShortBuffer array) {
        this.array = array;
    }

    public ShortBuffer getArray() {
        return array;
    }

    protected Object getElement(int index) {
        short val = array.get(array.position() + index);
        return val & 0xffff;
    }

    protected void putElement(int index, Object value) {
        int val = ((Number)value).intValue();
        array.put(array.position() + index, (short)(val & 0xffff));
    }

    public int getLength() {
        return array.remaining();
    }
}