The Android Open Source Project | 0eec464 | 2012-04-01 00:00:00 -0700 | [diff] [blame] | 1 | /* Licensed to the Apache Software Foundation (ASF) under one or more |
| 2 | * contributor license agreements. See the NOTICE file distributed with |
| 3 | * this work for additional information regarding copyright ownership. |
| 4 | * The ASF licenses this file to You under the Apache License, Version 2.0 |
| 5 | * (the "License"); you may not use this file except in compliance with |
| 6 | * the License. You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package java.nio; |
| 18 | |
| 19 | import org.apache.harmony.luni.platform.PlatformAddress; |
| 20 | import org.apache.harmony.nio.internal.DirectBuffer; |
| 21 | |
| 22 | /** |
| 23 | * This class wraps a byte buffer to be a float buffer. |
| 24 | * <p> |
| 25 | * Implementation notice: |
| 26 | * <ul> |
| 27 | * <li>After a byte buffer instance is wrapped, it becomes privately owned by |
| 28 | * the adapter. It must NOT be accessed outside the adapter any more.</li> |
| 29 | * <li>The byte buffer's position and limit are NOT linked with the adapter. |
| 30 | * The adapter extends Buffer, thus has its own position and limit.</li> |
| 31 | * </ul> |
| 32 | * </p> |
| 33 | */ |
| 34 | final class FloatToByteBufferAdapter extends FloatBuffer implements |
| 35 | DirectBuffer { |
| 36 | |
| 37 | static FloatBuffer wrap(ByteBuffer byteBuffer) { |
| 38 | return new FloatToByteBufferAdapter(byteBuffer.slice()); |
| 39 | } |
| 40 | |
| 41 | private final ByteBuffer byteBuffer; |
| 42 | |
| 43 | FloatToByteBufferAdapter(ByteBuffer byteBuffer) { |
| 44 | super((byteBuffer.capacity() >> 2)); |
| 45 | this.byteBuffer = byteBuffer; |
| 46 | this.byteBuffer.clear(); |
| 47 | } |
| 48 | |
| 49 | public int getByteCapacity() { |
| 50 | if (byteBuffer instanceof DirectBuffer) { |
| 51 | return ((DirectBuffer) byteBuffer).getByteCapacity(); |
| 52 | } |
| 53 | assert false : byteBuffer; |
| 54 | return -1; |
| 55 | } |
| 56 | |
| 57 | public PlatformAddress getEffectiveAddress() { |
| 58 | if (byteBuffer instanceof DirectBuffer) { |
| 59 | // BEGIN android-changed |
| 60 | PlatformAddress addr = ((DirectBuffer)byteBuffer).getEffectiveAddress(); |
| 61 | effectiveDirectAddress = addr.toInt(); |
| 62 | return addr; |
| 63 | // END android-changed |
| 64 | } |
| 65 | assert false : byteBuffer; |
| 66 | return null; |
| 67 | } |
| 68 | |
| 69 | public PlatformAddress getBaseAddress() { |
| 70 | if (byteBuffer instanceof DirectBuffer) { |
| 71 | return ((DirectBuffer) byteBuffer).getBaseAddress(); |
| 72 | } |
| 73 | assert false : byteBuffer; |
| 74 | return null; |
| 75 | } |
| 76 | |
| 77 | public boolean isAddressValid() { |
| 78 | if (byteBuffer instanceof DirectBuffer) { |
| 79 | return ((DirectBuffer) byteBuffer).isAddressValid(); |
| 80 | } |
| 81 | assert false : byteBuffer; |
| 82 | return false; |
| 83 | } |
| 84 | |
| 85 | public void addressValidityCheck() { |
| 86 | if (byteBuffer instanceof DirectBuffer) { |
| 87 | ((DirectBuffer) byteBuffer).addressValidityCheck(); |
| 88 | } else { |
| 89 | assert false : byteBuffer; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | public void free() { |
| 94 | if (byteBuffer instanceof DirectBuffer) { |
| 95 | ((DirectBuffer) byteBuffer).free(); |
| 96 | } else { |
| 97 | assert false : byteBuffer; |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | @Override |
| 102 | public FloatBuffer asReadOnlyBuffer() { |
| 103 | FloatToByteBufferAdapter buf = new FloatToByteBufferAdapter(byteBuffer |
| 104 | .asReadOnlyBuffer()); |
| 105 | buf.limit = limit; |
| 106 | buf.position = position; |
| 107 | buf.mark = mark; |
| 108 | return buf; |
| 109 | } |
| 110 | |
| 111 | @Override |
| 112 | public FloatBuffer compact() { |
| 113 | if (byteBuffer.isReadOnly()) { |
| 114 | throw new ReadOnlyBufferException(); |
| 115 | } |
| 116 | byteBuffer.limit(limit << 2); |
| 117 | byteBuffer.position(position << 2); |
| 118 | byteBuffer.compact(); |
| 119 | byteBuffer.clear(); |
| 120 | position = limit - position; |
| 121 | limit = capacity; |
| 122 | mark = UNSET_MARK; |
| 123 | return this; |
| 124 | } |
| 125 | |
| 126 | @Override |
| 127 | public FloatBuffer duplicate() { |
| 128 | FloatToByteBufferAdapter buf = new FloatToByteBufferAdapter(byteBuffer |
| 129 | .duplicate()); |
| 130 | buf.limit = limit; |
| 131 | buf.position = position; |
| 132 | buf.mark = mark; |
| 133 | return buf; |
| 134 | } |
| 135 | |
| 136 | @Override |
| 137 | public float get() { |
| 138 | if (position == limit) { |
| 139 | throw new BufferUnderflowException(); |
| 140 | } |
| 141 | return byteBuffer.getFloat(position++ << 2); |
| 142 | } |
| 143 | |
| 144 | @Override |
| 145 | public float get(int index) { |
| 146 | if (index < 0 || index >= limit) { |
| 147 | throw new IndexOutOfBoundsException(); |
| 148 | } |
| 149 | return byteBuffer.getFloat(index << 2); |
| 150 | } |
| 151 | |
| 152 | @Override |
| 153 | public boolean isDirect() { |
| 154 | return byteBuffer.isDirect(); |
| 155 | } |
| 156 | |
| 157 | @Override |
| 158 | public boolean isReadOnly() { |
| 159 | return byteBuffer.isReadOnly(); |
| 160 | } |
| 161 | |
| 162 | @Override |
| 163 | public ByteOrder order() { |
| 164 | return byteBuffer.order(); |
| 165 | } |
| 166 | |
| 167 | @Override |
| 168 | protected float[] protectedArray() { |
| 169 | throw new UnsupportedOperationException(); |
| 170 | } |
| 171 | |
| 172 | @Override |
| 173 | protected int protectedArrayOffset() { |
| 174 | throw new UnsupportedOperationException(); |
| 175 | } |
| 176 | |
| 177 | @Override |
| 178 | protected boolean protectedHasArray() { |
| 179 | return false; |
| 180 | } |
| 181 | |
| 182 | @Override |
| 183 | public FloatBuffer put(float c) { |
| 184 | if (position == limit) { |
| 185 | throw new BufferOverflowException(); |
| 186 | } |
| 187 | byteBuffer.putFloat(position++ << 2, c); |
| 188 | return this; |
| 189 | } |
| 190 | |
| 191 | @Override |
| 192 | public FloatBuffer put(int index, float c) { |
| 193 | if (index < 0 || index >= limit) { |
| 194 | throw new IndexOutOfBoundsException(); |
| 195 | } |
| 196 | byteBuffer.putFloat(index << 2, c); |
| 197 | return this; |
| 198 | } |
| 199 | |
| 200 | // BEGIN android-added |
| 201 | @Override |
| 202 | public FloatBuffer put(float[] c, int off, int len) { |
| 203 | if (byteBuffer instanceof ReadWriteDirectByteBuffer) { |
| 204 | byteBuffer.limit(limit << 2); |
| 205 | byteBuffer.position(position << 2); |
| 206 | ((ReadWriteDirectByteBuffer) byteBuffer).put(c, off, len); |
| 207 | this.position += len; |
| 208 | return this; |
| 209 | } else { |
| 210 | return super.put(c, off, len); |
| 211 | } |
| 212 | } |
| 213 | // END android-added |
| 214 | |
| 215 | |
| 216 | @Override |
| 217 | public FloatBuffer slice() { |
| 218 | byteBuffer.limit(limit << 2); |
| 219 | byteBuffer.position(position << 2); |
| 220 | FloatBuffer result = new FloatToByteBufferAdapter(byteBuffer.slice()); |
| 221 | byteBuffer.clear(); |
| 222 | return result; |
| 223 | } |
| 224 | |
| 225 | } |