Source Code Cross Referenced for ReadWriteHeapByteBuffer.java in  » Apache-Harmony-Java-SE » java-package » java » nio » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.nio 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Licensed to the Apache Software Foundation (ASF) under one or more
002:         * contributor license agreements.  See the NOTICE file distributed with
003:         * this work for additional information regarding copyright ownership.
004:         * The ASF licenses this file to You under the Apache License, Version 2.0
005:         * (the "License"); you may not use this file except in compliance with
006:         * the License.  You may obtain a copy of the License at
007:         * 
008:         *     http://www.apache.org/licenses/LICENSE-2.0
009:         * 
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package java.nio;
018:
019:        /**
020:         * HeapByteBuffer, ReadWriteHeapByteBuffer and ReadOnlyHeapByteBuffer compose
021:         * the implementation of array based byte buffers.
022:         * <p>
023:         * ReadWriteHeapByteBuffer extends HeapByteBuffer with all the write methods.
024:         * </p>
025:         * <p>
026:         * This class is marked final for runtime performance.
027:         * </p>
028:         * 
029:         */
030:        final class ReadWriteHeapByteBuffer extends HeapByteBuffer {
031:
032:            static ReadWriteHeapByteBuffer copy(HeapByteBuffer other,
033:                    int markOfOther) {
034:                ReadWriteHeapByteBuffer buf = new ReadWriteHeapByteBuffer(
035:                        other.backingArray, other.capacity(), other.offset);
036:                buf.limit = other.limit();
037:                buf.position = other.position();
038:                buf.mark = markOfOther;
039:                buf.order(other.order());
040:                return buf;
041:            }
042:
043:            ReadWriteHeapByteBuffer(byte[] backingArray) {
044:                super (backingArray);
045:            }
046:
047:            ReadWriteHeapByteBuffer(int capacity) {
048:                super (capacity);
049:            }
050:
051:            ReadWriteHeapByteBuffer(byte[] backingArray, int capacity,
052:                    int arrayOffset) {
053:                super (backingArray, capacity, arrayOffset);
054:            }
055:
056:            @Override
057:            public ByteBuffer asReadOnlyBuffer() {
058:                return ReadOnlyHeapByteBuffer.copy(this , mark);
059:            }
060:
061:            @Override
062:            public ByteBuffer compact() {
063:                System.arraycopy(backingArray, position + offset, backingArray,
064:                        offset, remaining());
065:                position = limit - position;
066:                limit = capacity;
067:                mark = UNSET_MARK;
068:                return this ;
069:            }
070:
071:            @Override
072:            public ByteBuffer duplicate() {
073:                return copy(this , mark);
074:            }
075:
076:            @Override
077:            public boolean isReadOnly() {
078:                return false;
079:            }
080:
081:            @Override
082:            protected byte[] protectedArray() {
083:                return backingArray;
084:            }
085:
086:            @Override
087:            protected int protectedArrayOffset() {
088:                return offset;
089:            }
090:
091:            @Override
092:            protected boolean protectedHasArray() {
093:                return true;
094:            }
095:
096:            @Override
097:            public ByteBuffer put(byte b) {
098:                if (position == limit) {
099:                    throw new BufferOverflowException();
100:                }
101:                backingArray[offset + position++] = b;
102:                return this ;
103:            }
104:
105:            @Override
106:            public ByteBuffer put(int index, byte b) {
107:                if (index < 0 || index >= limit) {
108:                    throw new IndexOutOfBoundsException();
109:                }
110:                backingArray[offset + index] = b;
111:                return this ;
112:            }
113:
114:            /*
115:             * Override ByteBuffer.put(byte[], int, int) to improve performance.
116:             * 
117:             * (non-Javadoc)
118:             * 
119:             * @see java.nio.ByteBuffer#put(byte[], int, int)
120:             */
121:            @Override
122:            public ByteBuffer put(byte[] src, int off, int len) {
123:                if (off < 0 || len < 0 || (long) off + (long) len > src.length) {
124:                    throw new IndexOutOfBoundsException();
125:                }
126:                if (len > remaining()) {
127:                    throw new BufferOverflowException();
128:                }
129:                if (isReadOnly()) {
130:                    throw new ReadOnlyBufferException();
131:                }
132:                System
133:                        .arraycopy(src, off, backingArray, offset + position,
134:                                len);
135:                position += len;
136:                return this ;
137:            }
138:
139:            @Override
140:            public ByteBuffer putDouble(double value) {
141:                return putLong(Double.doubleToRawLongBits(value));
142:            }
143:
144:            @Override
145:            public ByteBuffer putDouble(int index, double value) {
146:                return putLong(index, Double.doubleToRawLongBits(value));
147:            }
148:
149:            @Override
150:            public ByteBuffer putFloat(float value) {
151:                return putInt(Float.floatToIntBits(value));
152:            }
153:
154:            @Override
155:            public ByteBuffer putFloat(int index, float value) {
156:                return putInt(index, Float.floatToIntBits(value));
157:            }
158:
159:            @Override
160:            public ByteBuffer putInt(int value) {
161:                int newPosition = position + 4;
162:                if (newPosition > limit) {
163:                    throw new BufferOverflowException();
164:                }
165:                store(position, value);
166:                position = newPosition;
167:                return this ;
168:            }
169:
170:            @Override
171:            public ByteBuffer putInt(int index, int value) {
172:                if (index < 0 || (long) index + 4 > limit) {
173:                    throw new IndexOutOfBoundsException();
174:                }
175:                store(index, value);
176:                return this ;
177:            }
178:
179:            @Override
180:            public ByteBuffer putLong(int index, long value) {
181:                if (index < 0 || (long) index + 8 > limit) {
182:                    throw new IndexOutOfBoundsException();
183:                }
184:                store(index, value);
185:                return this ;
186:            }
187:
188:            @Override
189:            public ByteBuffer putLong(long value) {
190:                int newPosition = position + 8;
191:                if (newPosition > limit) {
192:                    throw new BufferOverflowException();
193:                }
194:                store(position, value);
195:                position = newPosition;
196:                return this ;
197:            }
198:
199:            @Override
200:            public ByteBuffer putShort(int index, short value) {
201:                if (index < 0 || (long) index + 2 > limit) {
202:                    throw new IndexOutOfBoundsException();
203:                }
204:                store(index, value);
205:                return this ;
206:            }
207:
208:            @Override
209:            public ByteBuffer putShort(short value) {
210:                int newPosition = position + 2;
211:                if (newPosition > limit) {
212:                    throw new BufferOverflowException();
213:                }
214:                store(position, value);
215:                position = newPosition;
216:                return this ;
217:            }
218:
219:            @Override
220:            public ByteBuffer slice() {
221:                ReadWriteHeapByteBuffer slice = new ReadWriteHeapByteBuffer(
222:                        backingArray, remaining(), offset + position);
223:                slice.order = order;
224:                return slice;
225:            }
226:        }
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