1 /*
   2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package jdk.nashorn.internal.runtime.arrays;
  26 
  27 import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
  28 
  29 import java.nio.ByteBuffer;
  30 import jdk.nashorn.internal.objects.Global;
  31 import jdk.nashorn.internal.runtime.PropertyDescriptor;
  32 import jdk.nashorn.internal.runtime.ScriptRuntime;
  33 
  34 /**
  35  * Implementation of {@link ArrayData} that wraps a nio ByteBuffer
  36  */
  37 final class ByteBufferArrayData extends ArrayData {
  38     private final ByteBuffer buf;
  39 
  40     ByteBufferArrayData(final int length) {
  41         super(length);
  42         this.buf = ByteBuffer.allocateDirect(length);
  43     }
  44 
  45     /**
  46      * Constructor
  47      *
  48      * @param buf ByteBuffer to create array data with.
  49      */
  50     ByteBufferArrayData(final ByteBuffer buf) {
  51         super(buf.capacity());
  52         this.buf = buf;
  53     }
  54 
  55     /**
  56      * Returns property descriptor for element at a given index
  57      *
  58      * @param global the global object
  59      * @param index  the index
  60      *
  61      * @return property descriptor for element
  62      */
  63     @Override
  64     public PropertyDescriptor getDescriptor(final Global global, final int index) {
  65         // make the index properties not configurable
  66         return global.newDataDescriptor(getObject(index), false, true, true);
  67     }
  68 
  69     @Override
  70     public ArrayData copy() {
  71         throw unsupported("copy");
  72     }
  73 
  74     @Override
  75     public Object[] asObjectArray() {
  76         throw unsupported("asObjectArray");
  77     }
  78 
  79     @Override
  80     public void setLength(final long length) {
  81         throw new UnsupportedOperationException("setLength");
  82     }
  83 
  84     @Override
  85     public void shiftLeft(int by) {
  86         throw unsupported("shiftLeft");
  87     }
  88 
  89     @Override
  90     public ArrayData shiftRight(int by) {
  91         throw unsupported("shiftRight");
  92     }
  93 
  94     @Override
  95     public ArrayData ensure(long safeIndex) {
  96         if (safeIndex < buf.capacity()) {
  97             return this;
  98         }
  99 
 100         throw unsupported("ensure");
 101     }
 102 
 103     @Override
 104     public ArrayData shrink(long newLength) {
 105         throw unsupported("shrink");
 106     }
 107 
 108     @Override
 109     public ArrayData set(int index, Object value, boolean strict) {
 110         if (value instanceof Number) {
 111             buf.put(index, ((Number)value).byteValue());
 112             return this;
 113         }
 114 
 115         throw typeError("not.a.number", ScriptRuntime.safeToString(value));
 116     }
 117 
 118     @Override
 119     public ArrayData set(int index, int value, boolean strict) {
 120         buf.put(index, (byte)value);
 121         return this;
 122     }
 123 
 124     @Override
 125     public ArrayData set(int index, long value, boolean strict) {
 126         buf.put(index, (byte)value);
 127         return this;
 128     }
 129 
 130     @Override
 131     public ArrayData set(int index, double value, boolean strict) {
 132         buf.put(index, (byte)value);
 133         return this;
 134     }
 135 
 136     @Override
 137     public int getInt(int index) {
 138         return 0x0ff & buf.get(index);
 139     }
 140 
 141     @Override
 142     public long getLong(int index) {
 143         return 0x0ff & buf.get(index);
 144     }
 145 
 146     @Override
 147     public double getDouble(int index) {
 148         return 0x0ff & buf.get(index);
 149     }
 150 
 151     @Override
 152     public Object getObject(int index) {
 153         return (int)(0x0ff & buf.get(index));
 154     }
 155 
 156     @Override
 157     public boolean has(int index) {
 158         return index > -1 && index < buf.capacity();
 159     }
 160 
 161     @Override
 162     public boolean canDelete(final int index, final boolean strict) {
 163         return false;
 164     }
 165 
 166     @Override
 167     public boolean canDelete(final long fromIndex, final long toIndex, final boolean strict) {
 168         return false;
 169     }
 170 
 171     @Override
 172     public ArrayData delete(int index) {
 173         throw unsupported("delete");
 174     }
 175 
 176     @Override
 177     public ArrayData delete(long fromIndex, long toIndex) {
 178         throw unsupported("delete");
 179     }
 180 
 181     @Override
 182     public ArrayData push(final boolean strict, final Object... items) {
 183         throw unsupported("push");
 184     }
 185 
 186     @Override
 187     public Object pop() {
 188         throw unsupported("pop");
 189     }
 190 
 191     @Override
 192     public ArrayData slice(long from, long to) {
 193         throw unsupported("slice");
 194     }
 195 
 196     @Override
 197     public ArrayData convert(final Class<?> type) {
 198         throw unsupported("convert");
 199     }
 200 
 201     private UnsupportedOperationException unsupported(final String method) {
 202         return new UnsupportedOperationException(method);
 203     }
 204 }
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