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.runtime.GlobalObject;
  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     public PropertyDescriptor getDescriptor(final GlobalObject global, final int index) {

  64         // make the index properties not configurable
  65         return global.newDataDescriptor(getObject(index), false, true, true);
  66     }
  67 
  68     @Override
  69     public ArrayData copy() {
  70         throw unsupported("copy");
  71     }
  72 
  73     @Override
  74     public Object[] asObjectArray() {
  75         throw unsupported("asObjectArray");
  76     }
  77 
  78     @Override
  79     public void setLength(final long length) {
  80         throw new UnsupportedOperationException("setLength");
  81     }
  82 
  83     @Override
  84     public void shiftLeft(int by) {
  85         throw unsupported("shiftLeft");
  86     }
  87 
  88     @Override
  89     public ArrayData shiftRight(int by) {
  90         throw unsupported("shiftRight");
  91     }
  92 
  93     @Override
  94     public ArrayData ensure(long safeIndex) {
  95         if (safeIndex < buf.capacity()) {
  96             return this;
  97         }
  98 
  99         throw unsupported("ensure");
 100     }
 101 
 102     @Override
 103     public ArrayData shrink(long newLength) {
 104         throw unsupported("shrink");
 105     }
 106 
 107     @Override
 108     public ArrayData set(int index, Object value, boolean strict) {
 109         if (value instanceof Number) {
 110             buf.put(index, ((Number)value).byteValue());
 111             return this;
 112         }
 113 
 114         throw typeError("not.a.number", ScriptRuntime.safeToString(value));
 115     }
 116 
 117     @Override
 118     public ArrayData set(int index, int value, boolean strict) {
 119         buf.put(index, (byte)value);
 120         return this;
 121     }
 122 
 123     @Override
 124     public ArrayData set(int index, long value, boolean strict) {
 125         buf.put(index, (byte)value);
 126         return this;
 127     }
 128 
 129     @Override
 130     public ArrayData set(int index, double value, boolean strict) {
 131         buf.put(index, (byte)value);
 132         return this;
 133     }
 134 
 135     @Override
 136     public int getInt(int index) {
 137         return 0x0ff & buf.get(index);
 138     }
 139 
 140     @Override
 141     public long getLong(int index) {
 142         return 0x0ff & buf.get(index);
 143     }
 144 
 145     @Override
 146     public double getDouble(int index) {
 147         return 0x0ff & buf.get(index);
 148     }
 149 
 150     @Override
 151     public Object getObject(int index) {
 152         return (int)(0x0ff & buf.get(index));
 153     }
 154 
 155     @Override
 156     public boolean has(int index) {
 157         return index > -1 && index < buf.capacity();
 158     }
 159 
 160     @Override
 161     public boolean canDelete(final int index, final boolean strict) {
 162         return false;
 163     }
 164 
 165     @Override
 166     public boolean canDelete(final long fromIndex, final long toIndex, final boolean strict) {
 167         return false;
 168     }
 169 
 170     @Override
 171     public ArrayData delete(int index) {
 172         throw unsupported("delete");
 173     }
 174 
 175     @Override
 176     public ArrayData delete(long fromIndex, long toIndex) {
 177         throw unsupported("delete");
 178     }
 179 
 180     @Override
 181     public ArrayData push(final boolean strict, final Object... items) {
 182         throw unsupported("push");
 183     }
 184 
 185     @Override
 186     public Object pop() {
 187         throw unsupported("pop");
 188     }
 189 
 190     @Override
 191     public ArrayData slice(long from, long to) {
 192         throw unsupported("slice");
 193     }
 194 
 195     @Override
 196     public ArrayData convert(final Class<?> type) {
 197         throw unsupported("convert");
 198     }
 199 
 200     private UnsupportedOperationException unsupported(final String method) {
 201         return new UnsupportedOperationException(method);
 202     }
 203 }
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