| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package java.nio; |
| |
| /** |
| * DoubleArrayBuffer, ReadWriteDoubleArrayBuffer and ReadOnlyDoubleArrayBuffer |
| * compose the implementation of array based double buffers. |
| * <p> |
| * DoubleArrayBuffer implements all the shared readonly methods and is extended |
| * by the other two classes. |
| * </p> |
| * <p> |
| * All methods are marked final for runtime performance. |
| * </p> |
| * |
| */ |
| abstract class DoubleArrayBuffer extends DoubleBuffer { |
| |
| protected final double[] backingArray; |
| |
| protected final int offset; |
| |
| DoubleArrayBuffer(double[] array) { |
| this(array.length, array, 0); |
| } |
| |
| DoubleArrayBuffer(int capacity) { |
| this(capacity, new double[capacity], 0); |
| } |
| |
| DoubleArrayBuffer(int capacity, double[] backingArray, int offset) { |
| super(capacity); |
| this.backingArray = backingArray; |
| this.offset = offset; |
| } |
| |
| @Override |
| public final double get() { |
| if (position == limit) { |
| throw new BufferUnderflowException(); |
| } |
| return backingArray[offset + position++]; |
| } |
| |
| @Override |
| public final double get(int index) { |
| if (index < 0 || index >= limit) { |
| throw new IndexOutOfBoundsException(); |
| } |
| return backingArray[offset + index]; |
| } |
| |
| @Override |
| public final DoubleBuffer get(double[] dst, int off, int len) { |
| int length = dst.length; |
| if (off < 0 || len < 0 || (long) off + (long) len > length) { |
| throw new IndexOutOfBoundsException(); |
| } |
| if (len > remaining()) { |
| throw new BufferUnderflowException(); |
| } |
| System.arraycopy(backingArray, offset + position, dst, off, len); |
| position += len; |
| return this; |
| } |
| |
| @Override |
| public final boolean isDirect() { |
| return false; |
| } |
| |
| @Override |
| public final ByteOrder order() { |
| return ByteOrder.nativeOrder(); |
| } |
| |
| } |