Mercurial > jdk8-mips64-public > nashorn / file revision

 /*

  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  */

 package jdk.nashorn.internal.objects;

 import jdk.nashorn.internal.objects.annotations.Attribute;

 import jdk.nashorn.internal.objects.annotations.Constructor;

 import jdk.nashorn.internal.objects.annotations.Function;

 import jdk.nashorn.internal.objects.annotations.Property;

 import jdk.nashorn.internal.objects.annotations.ScriptClass;

 import jdk.nashorn.internal.objects.annotations.Where;

 import jdk.nashorn.internal.runtime.PropertyMap;

 import jdk.nashorn.internal.runtime.ScriptObject;

 import jdk.nashorn.internal.runtime.arrays.ArrayData;

 /**

  * Uint8 array for TypedArray extension

  */

 @ScriptClass("Uint8Array")

 public final class NativeUint8Array extends ArrayBufferView {

     /**

      * The size in bytes of each element in the array.

      */

     @Property(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE, where = Where.CONSTRUCTOR)

     public static final int BYTES_PER_ELEMENT = 1;

     // initialized by nasgen

     private static PropertyMap $nasgenmap$;

     private static final Factory FACTORY = new Factory(BYTES_PER_ELEMENT) {

         @Override

         public ArrayBufferView construct(final NativeArrayBuffer buffer, final int byteOffset, final int length) {

             return new NativeUint8Array(buffer, byteOffset, length);

         }

         @Override

         public ArrayData createArrayData(final NativeArrayBuffer buffer, final int byteOffset, final int length) {

             return new Uint8ArrayData(buffer, byteOffset, length);

         }

     };

     private static final class Uint8ArrayData extends ArrayDataImpl {

         private Uint8ArrayData(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength) {

             super(buffer, byteOffset, elementLength);

         }

         @Override

         protected int byteIndex(final int index) {

             return index * BYTES_PER_ELEMENT + byteOffset;

         }

         @Override

         protected int getIntImpl(final int index) {

             return buffer.getByteArray()[byteIndex(index)] & 0xff;

         }

         @Override

         protected void setImpl(final int index, final int value) {

             buffer.getByteArray()[byteIndex(index)] = (byte)value;

         }

     }

     /**

      * Constructor

      *

      * @param newObj is this typed array instantiated with the new operator

      * @param self   self reference

      * @param args   args

      *

      * @return new typed array

      */

     @Constructor(arity = 1)

     public static Object constructor(final boolean newObj, final Object self, final Object... args) {

         return constructorImpl(args, FACTORY);

     }

     NativeUint8Array(final NativeArrayBuffer buffer, final int byteOffset, final int length) {

         super(buffer, byteOffset, length);

     }

     @Override

     protected Factory factory() {

         return FACTORY;

     }

     /**

      * Set values

      * @param self   self reference

      * @param array  multiple values of array's type to set

      * @param offset optional start index, interpreted  0 if undefined

      * @return undefined

      */

     @Function(attributes = Attribute.NOT_ENUMERABLE)

     protected static Object set(final Object self, final Object array, final Object offset) {

         return ArrayBufferView.setImpl(self, array, offset);

     }

     /**

      * Returns a new TypedArray view of the ArrayBuffer store for this TypedArray,

      * referencing the elements at begin, inclusive, up to end, exclusive. If either

      * begin or end is negative, it refers to an index from the end of the array,

      * as opposed to from the beginning.

      * <p>

      * If end is unspecified, the subarray contains all elements from begin to the end

      * of the TypedArray. The range specified by the begin and end values is clamped to

      * the valid index range for the current array. If the computed length of the new

      * TypedArray would be negative, it is clamped to zero.

      * <p>

      * The returned TypedArray will be of the same type as the array on which this

      * method is invoked.

      *

      * @param self self reference

      * @param begin begin position

      * @param end end position

      *

      * @return sub array

      */

     @Function(attributes = Attribute.NOT_ENUMERABLE)

     protected static Object subarray(final Object self, final Object begin, final Object end) {

         return ArrayBufferView.subarrayImpl(self, begin, end);

     }

     @Override

     protected ScriptObject getPrototype() {

         return Global.instance().getUint8ArrayPrototype();

     }

 }