| /* |
| * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| // -- This file was mechanically generated: Do not edit! -- // |
| |
| package java.nio; |
| |
| |
| import dalvik.annotation.codegen.CovariantReturnType; |
| |
| /** |
| * A double buffer. |
| * |
| * <p> This class defines four categories of operations upon |
| * double buffers: |
| * |
| * <ul> |
| * |
| * <li><p> Absolute and relative {@link #get() <i>get</i>} and |
| * {@link #put(double) <i>put</i>} methods that read and write |
| * single doubles; </p></li> |
| * |
| * <li><p> Relative {@link #get(double[]) <i>bulk get</i>} |
| * methods that transfer contiguous sequences of doubles from this buffer |
| * into an array; and</p></li> |
| * |
| * <li><p> Relative {@link #put(double[]) <i>bulk put</i>} |
| * methods that transfer contiguous sequences of doubles from a |
| * double array or some other double |
| * buffer into this buffer; and </p></li> |
| * |
| * |
| * <li><p> Methods for {@link #compact compacting}, {@link |
| * #duplicate duplicating}, and {@link #slice slicing} |
| * a double buffer. </p></li> |
| * |
| * </ul> |
| * |
| * <p> Double buffers can be created either by {@link #allocate |
| * <i>allocation</i>}, which allocates space for the buffer's |
| * |
| * |
| * content, by {@link #wrap(double[]) <i>wrapping</i>} an existing |
| * double array into a buffer, or by creating a |
| * <a href="ByteBuffer.html#views"><i>view</i></a> of an existing byte buffer. |
| * |
| * |
| * |
| * |
| * <p> Like a byte buffer, a double buffer is either <a |
| * href="ByteBuffer.html#direct"><i>direct</i> or <i>non-direct</i></a>. A |
| * double buffer created via the <tt>wrap</tt> methods of this class will |
| * be non-direct. A double buffer created as a view of a byte buffer will |
| * be direct if, and only if, the byte buffer itself is direct. Whether or not |
| * a double buffer is direct may be determined by invoking the {@link |
| * #isDirect isDirect} method. </p> |
| * |
| * |
| * |
| * |
| * <p> Methods in this class that do not otherwise have a value to return are |
| * specified to return the buffer upon which they are invoked. This allows |
| * method invocations to be chained. |
| * |
| * |
| * |
| * @author Mark Reinhold |
| * @author JSR-51 Expert Group |
| * @since 1.4 |
| */ |
| |
| public abstract class DoubleBuffer |
| extends Buffer |
| implements Comparable<DoubleBuffer> |
| { |
| |
| // These fields are declared here rather than in Heap-X-Buffer in order to |
| // reduce the number of virtual method invocations needed to access these |
| // values, which is especially costly when coding small buffers. |
| // |
| final double[] hb; // Non-null only for heap buffers |
| final int offset; |
| boolean isReadOnly; // Valid only for heap buffers |
| |
| // Creates a new buffer with the given mark, position, limit, capacity, |
| // backing array, and array offset |
| // |
| DoubleBuffer(int mark, int pos, int lim, int cap, // package-private |
| double[] hb, int offset) |
| { |
| // Android-added: elementSizeShift parameter (log2 of element size). |
| super(mark, pos, lim, cap, 3 /* elementSizeShift */); |
| this.hb = hb; |
| this.offset = offset; |
| } |
| |
| // Creates a new buffer with the given mark, position, limit, and capacity |
| // |
| DoubleBuffer(int mark, int pos, int lim, int cap) { // package-private |
| this(mark, pos, lim, cap, null, 0); |
| } |
| |
| |
| /** |
| * Allocates a new double buffer. |
| * |
| * <p> The new buffer's position will be zero, its limit will be its |
| * capacity, its mark will be undefined, and each of its elements will be |
| * initialized to zero. It will have a {@link #array backing array}, |
| * and its {@link #arrayOffset array offset} will be zero. |
| * |
| * @param capacity |
| * The new buffer's capacity, in doubles |
| * |
| * @return The new double buffer |
| * |
| * @throws IllegalArgumentException |
| * If the <tt>capacity</tt> is a negative integer |
| */ |
| public static DoubleBuffer allocate(int capacity) { |
| if (capacity < 0) |
| throw new IllegalArgumentException(); |
| return new HeapDoubleBuffer(capacity, capacity); |
| } |
| |
| /** |
| * Wraps a double array into a buffer. |
| * |
| * <p> The new buffer will be backed by the given double array; |
| * that is, modifications to the buffer will cause the array to be modified |
| * and vice versa. The new buffer's capacity will be |
| * <tt>array.length</tt>, its position will be <tt>offset</tt>, its limit |
| * will be <tt>offset + length</tt>, and its mark will be undefined. Its |
| * {@link #array backing array} will be the given array, and |
| * its {@link #arrayOffset array offset} will be zero. </p> |
| * |
| * @param array |
| * The array that will back the new buffer |
| * |
| * @param offset |
| * The offset of the subarray to be used; must be non-negative and |
| * no larger than <tt>array.length</tt>. The new buffer's position |
| * will be set to this value. |
| * |
| * @param length |
| * The length of the subarray to be used; |
| * must be non-negative and no larger than |
| * <tt>array.length - offset</tt>. |
| * The new buffer's limit will be set to <tt>offset + length</tt>. |
| * |
| * @return The new double buffer |
| * |
| * @throws IndexOutOfBoundsException |
| * If the preconditions on the <tt>offset</tt> and <tt>length</tt> |
| * parameters do not hold |
| */ |
| public static DoubleBuffer wrap(double[] array, |
| int offset, int length) |
| { |
| try { |
| return new HeapDoubleBuffer(array, offset, length); |
| } catch (IllegalArgumentException x) { |
| throw new IndexOutOfBoundsException(); |
| } |
| } |
| |
| /** |
| * Wraps a double array into a buffer. |
| * |
| * <p> The new buffer will be backed by the given double array; |
| * that is, modifications to the buffer will cause the array to be modified |
| * and vice versa. The new buffer's capacity and limit will be |
| * <tt>array.length</tt>, its position will be zero, and its mark will be |
| * undefined. Its {@link #array backing array} will be the |
| * given array, and its {@link #arrayOffset array offset>} will |
| * be zero. </p> |
| * |
| * @param array |
| * The array that will back this buffer |
| * |
| * @return The new double buffer |
| */ |
| public static DoubleBuffer wrap(double[] array) { |
| return wrap(array, 0, array.length); |
| } |
| |
| |
| /** |
| * Creates a new double buffer whose content is a shared subsequence of |
| * this buffer's content. |
| * |
| * <p> The content of the new buffer will start at this buffer's current |
| * position. Changes to this buffer's content will be visible in the new |
| * buffer, and vice versa; the two buffers' position, limit, and mark |
| * values will be independent. |
| * |
| * <p> The new buffer's position will be zero, its capacity and its limit |
| * will be the number of doubles remaining in this buffer, and its mark |
| * will be undefined. The new buffer will be direct if, and only if, this |
| * buffer is direct, and it will be read-only if, and only if, this buffer |
| * is read-only. </p> |
| * |
| * @return The new double buffer |
| */ |
| public abstract DoubleBuffer slice(); |
| |
| /** |
| * Creates a new double buffer that shares this buffer's content. |
| * |
| * <p> The content of the new buffer will be that of this buffer. Changes |
| * to this buffer's content will be visible in the new buffer, and vice |
| * versa; the two buffers' position, limit, and mark values will be |
| * independent. |
| * |
| * <p> The new buffer's capacity, limit, position, and mark values will be |
| * identical to those of this buffer. The new buffer will be direct if, |
| * and only if, this buffer is direct, and it will be read-only if, and |
| * only if, this buffer is read-only. </p> |
| * |
| * @return The new double buffer |
| */ |
| public abstract DoubleBuffer duplicate(); |
| |
| /** |
| * Creates a new, read-only double buffer that shares this buffer's |
| * content. |
| * |
| * <p> The content of the new buffer will be that of this buffer. Changes |
| * to this buffer's content will be visible in the new buffer; the new |
| * buffer itself, however, will be read-only and will not allow the shared |
| * content to be modified. The two buffers' position, limit, and mark |
| * values will be independent. |
| * |
| * <p> The new buffer's capacity, limit, position, and mark values will be |
| * identical to those of this buffer. |
| * |
| * <p> If this buffer is itself read-only then this method behaves in |
| * exactly the same way as the {@link #duplicate duplicate} method. </p> |
| * |
| * @return The new, read-only double buffer |
| */ |
| public abstract DoubleBuffer asReadOnlyBuffer(); |
| |
| |
| // -- Singleton get/put methods -- |
| |
| /** |
| * Relative <i>get</i> method. Reads the double at this buffer's |
| * current position, and then increments the position. |
| * |
| * @return The double at the buffer's current position |
| * |
| * @throws BufferUnderflowException |
| * If the buffer's current position is not smaller than its limit |
| */ |
| public abstract double get(); |
| |
| /** |
| * Relative <i>put</i> method <i>(optional operation)</i>. |
| * |
| * <p> Writes the given double into this buffer at the current |
| * position, and then increments the position. </p> |
| * |
| * @param d |
| * The double to be written |
| * |
| * @return This buffer |
| * |
| * @throws BufferOverflowException |
| * If this buffer's current position is not smaller than its limit |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract DoubleBuffer put(double d); |
| |
| /** |
| * Absolute <i>get</i> method. Reads the double at the given |
| * index. |
| * |
| * @param index |
| * The index from which the double will be read |
| * |
| * @return The double at the given index |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit |
| */ |
| public abstract double get(int index); |
| |
| /** |
| * Absolute <i>put</i> method <i>(optional operation)</i>. |
| * |
| * <p> Writes the given double into this buffer at the given |
| * index. </p> |
| * |
| * @param index |
| * The index at which the double will be written |
| * |
| * @param d |
| * The double value to be written |
| * |
| * @return This buffer |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract DoubleBuffer put(int index, double d); |
| |
| |
| // -- Bulk get operations -- |
| |
| /** |
| * Relative bulk <i>get</i> method. |
| * |
| * <p> This method transfers doubles from this buffer into the given |
| * destination array. If there are fewer doubles remaining in the |
| * buffer than are required to satisfy the request, that is, if |
| * <tt>length</tt> <tt>></tt> <tt>remaining()</tt>, then no |
| * doubles are transferred and a {@link BufferUnderflowException} is |
| * thrown. |
| * |
| * <p> Otherwise, this method copies <tt>length</tt> doubles from this |
| * buffer into the given array, starting at the current position of this |
| * buffer and at the given offset in the array. The position of this |
| * buffer is then incremented by <tt>length</tt>. |
| * |
| * <p> In other words, an invocation of this method of the form |
| * <tt>src.get(dst, off, len)</tt> has exactly the same effect as |
| * the loop |
| * |
| * <pre>{@code |
| * for (int i = off; i < off + len; i++) |
| * dst[i] = src.get(); |
| * }</pre> |
| * |
| * except that it first checks that there are sufficient doubles in |
| * this buffer and it is potentially much more efficient. |
| * |
| * @param dst |
| * The array into which doubles are to be written |
| * |
| * @param offset |
| * The offset within the array of the first double to be |
| * written; must be non-negative and no larger than |
| * <tt>dst.length</tt> |
| * |
| * @param length |
| * The maximum number of doubles to be written to the given |
| * array; must be non-negative and no larger than |
| * <tt>dst.length - offset</tt> |
| * |
| * @return This buffer |
| * |
| * @throws BufferUnderflowException |
| * If there are fewer than <tt>length</tt> doubles |
| * remaining in this buffer |
| * |
| * @throws IndexOutOfBoundsException |
| * If the preconditions on the <tt>offset</tt> and <tt>length</tt> |
| * parameters do not hold |
| */ |
| public DoubleBuffer get(double[] dst, int offset, int length) { |
| checkBounds(offset, length, dst.length); |
| if (length > remaining()) |
| throw new BufferUnderflowException(); |
| int end = offset + length; |
| for (int i = offset; i < end; i++) |
| dst[i] = get(); |
| return this; |
| } |
| |
| /** |
| * Relative bulk <i>get</i> method. |
| * |
| * <p> This method transfers doubles from this buffer into the given |
| * destination array. An invocation of this method of the form |
| * <tt>src.get(a)</tt> behaves in exactly the same way as the invocation |
| * |
| * <pre> |
| * src.get(a, 0, a.length) </pre> |
| * |
| * @param dst |
| * The destination array |
| * |
| * @return This buffer |
| * |
| * @throws BufferUnderflowException |
| * If there are fewer than <tt>length</tt> doubles |
| * remaining in this buffer |
| */ |
| public DoubleBuffer get(double[] dst) { |
| return get(dst, 0, dst.length); |
| } |
| |
| |
| // -- Bulk put operations -- |
| |
| /** |
| * Relative bulk <i>put</i> method <i>(optional operation)</i>. |
| * |
| * <p> This method transfers the doubles remaining in the given source |
| * buffer into this buffer. If there are more doubles remaining in the |
| * source buffer than in this buffer, that is, if |
| * <tt>src.remaining()</tt> <tt>></tt> <tt>remaining()</tt>, |
| * then no doubles are transferred and a {@link |
| * BufferOverflowException} is thrown. |
| * |
| * <p> Otherwise, this method copies |
| * <i>n</i> = <tt>src.remaining()</tt> doubles from the given |
| * buffer into this buffer, starting at each buffer's current position. |
| * The positions of both buffers are then incremented by <i>n</i>. |
| * |
| * <p> In other words, an invocation of this method of the form |
| * <tt>dst.put(src)</tt> has exactly the same effect as the loop |
| * |
| * <pre> |
| * while (src.hasRemaining()) |
| * dst.put(src.get()); </pre> |
| * |
| * except that it first checks that there is sufficient space in this |
| * buffer and it is potentially much more efficient. |
| * |
| * @param src |
| * The source buffer from which doubles are to be read; |
| * must not be this buffer |
| * |
| * @return This buffer |
| * |
| * @throws BufferOverflowException |
| * If there is insufficient space in this buffer |
| * for the remaining doubles in the source buffer |
| * |
| * @throws IllegalArgumentException |
| * If the source buffer is this buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public DoubleBuffer put(DoubleBuffer src) { |
| if (src == this) |
| throw new IllegalArgumentException(); |
| if (isReadOnly()) |
| throw new ReadOnlyBufferException(); |
| int n = src.remaining(); |
| if (n > remaining()) |
| throw new BufferOverflowException(); |
| for (int i = 0; i < n; i++) |
| put(src.get()); |
| return this; |
| } |
| |
| /** |
| * Relative bulk <i>put</i> method <i>(optional operation)</i>. |
| * |
| * <p> This method transfers doubles into this buffer from the given |
| * source array. If there are more doubles to be copied from the array |
| * than remain in this buffer, that is, if |
| * <tt>length</tt> <tt>></tt> <tt>remaining()</tt>, then no |
| * doubles are transferred and a {@link BufferOverflowException} is |
| * thrown. |
| * |
| * <p> Otherwise, this method copies <tt>length</tt> doubles from the |
| * given array into this buffer, starting at the given offset in the array |
| * and at the current position of this buffer. The position of this buffer |
| * is then incremented by <tt>length</tt>. |
| * |
| * <p> In other words, an invocation of this method of the form |
| * <tt>dst.put(src, off, len)</tt> has exactly the same effect as |
| * the loop |
| * |
| * <pre>{@code |
| * for (int i = off; i < off + len; i++) |
| * dst.put(a[i]); |
| * }</pre> |
| * |
| * except that it first checks that there is sufficient space in this |
| * buffer and it is potentially much more efficient. |
| * |
| * @param src |
| * The array from which doubles are to be read |
| * |
| * @param offset |
| * The offset within the array of the first double to be read; |
| * must be non-negative and no larger than <tt>array.length</tt> |
| * |
| * @param length |
| * The number of doubles to be read from the given array; |
| * must be non-negative and no larger than |
| * <tt>array.length - offset</tt> |
| * |
| * @return This buffer |
| * |
| * @throws BufferOverflowException |
| * If there is insufficient space in this buffer |
| * |
| * @throws IndexOutOfBoundsException |
| * If the preconditions on the <tt>offset</tt> and <tt>length</tt> |
| * parameters do not hold |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public DoubleBuffer put(double[] src, int offset, int length) { |
| checkBounds(offset, length, src.length); |
| if (length > remaining()) |
| throw new BufferOverflowException(); |
| int end = offset + length; |
| for (int i = offset; i < end; i++) |
| this.put(src[i]); |
| return this; |
| } |
| |
| /** |
| * Relative bulk <i>put</i> method <i>(optional operation)</i>. |
| * |
| * <p> This method transfers the entire content of the given source |
| * double array into this buffer. An invocation of this method of the |
| * form <tt>dst.put(a)</tt> behaves in exactly the same way as the |
| * invocation |
| * |
| * <pre> |
| * dst.put(a, 0, a.length) </pre> |
| * |
| * @param src |
| * The source array |
| * |
| * @return This buffer |
| * |
| * @throws BufferOverflowException |
| * If there is insufficient space in this buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public final DoubleBuffer put(double[] src) { |
| return put(src, 0, src.length); |
| } |
| |
| |
| // -- Other stuff -- |
| |
| /** |
| * Tells whether or not this buffer is backed by an accessible double |
| * array. |
| * |
| * <p> If this method returns <tt>true</tt> then the {@link #array() array} |
| * and {@link #arrayOffset() arrayOffset} methods may safely be invoked. |
| * </p> |
| * |
| * @return <tt>true</tt> if, and only if, this buffer |
| * is backed by an array and is not read-only |
| */ |
| public final boolean hasArray() { |
| return (hb != null) && !isReadOnly; |
| } |
| |
| /** |
| * Returns the double array that backs this |
| * buffer <i>(optional operation)</i>. |
| * |
| * <p> Modifications to this buffer's content will cause the returned |
| * array's content to be modified, and vice versa. |
| * |
| * <p> Invoke the {@link #hasArray hasArray} method before invoking this |
| * method in order to ensure that this buffer has an accessible backing |
| * array. </p> |
| * |
| * @return The array that backs this buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is backed by an array but is read-only |
| * |
| * @throws UnsupportedOperationException |
| * If this buffer is not backed by an accessible array |
| */ |
| public final double[] array() { |
| if (hb == null) |
| throw new UnsupportedOperationException(); |
| if (isReadOnly) |
| throw new ReadOnlyBufferException(); |
| return hb; |
| } |
| |
| /** |
| * Returns the offset within this buffer's backing array of the first |
| * element of the buffer <i>(optional operation)</i>. |
| * |
| * <p> If this buffer is backed by an array then buffer position <i>p</i> |
| * corresponds to array index <i>p</i> + <tt>arrayOffset()</tt>. |
| * |
| * <p> Invoke the {@link #hasArray hasArray} method before invoking this |
| * method in order to ensure that this buffer has an accessible backing |
| * array. </p> |
| * |
| * @return The offset within this buffer's array |
| * of the first element of the buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is backed by an array but is read-only |
| * |
| * @throws UnsupportedOperationException |
| * If this buffer is not backed by an accessible array |
| */ |
| public final int arrayOffset() { |
| if (hb == null) |
| throw new UnsupportedOperationException(); |
| if (isReadOnly) |
| throw new ReadOnlyBufferException(); |
| return offset; |
| } |
| |
| // BEGIN Android-added: covariant overloads of *Buffer methods that return this. |
| @CovariantReturnType(returnType = DoubleBuffer.class, presentAfter = 28) |
| @Override |
| public Buffer position(int newPosition) { |
| return super.position(newPosition); |
| } |
| |
| @CovariantReturnType(returnType = DoubleBuffer.class, presentAfter = 28) |
| @Override |
| public Buffer limit(int newLimit) { |
| return super.limit(newLimit); |
| } |
| |
| @CovariantReturnType(returnType = DoubleBuffer.class, presentAfter = 28) |
| @Override |
| public Buffer mark() { |
| return super.mark(); |
| } |
| |
| @CovariantReturnType(returnType = DoubleBuffer.class, presentAfter = 28) |
| @Override |
| public Buffer reset() { |
| return super.reset(); |
| } |
| |
| @CovariantReturnType(returnType = DoubleBuffer.class, presentAfter = 28) |
| @Override |
| public Buffer clear() { |
| return super.clear(); |
| } |
| |
| @CovariantReturnType(returnType = DoubleBuffer.class, presentAfter = 28) |
| @Override |
| public Buffer flip() { |
| return super.flip(); |
| } |
| |
| @CovariantReturnType(returnType = DoubleBuffer.class, presentAfter = 28) |
| @Override |
| public Buffer rewind() { |
| return super.rewind(); |
| } |
| // END Android-added: covariant overloads of *Buffer methods that return this. |
| |
| /** |
| * Compacts this buffer <i>(optional operation)</i>. |
| * |
| * <p> The doubles between the buffer's current position and its limit, |
| * if any, are copied to the beginning of the buffer. That is, the |
| * double at index <i>p</i> = <tt>position()</tt> is copied |
| * to index zero, the double at index <i>p</i> + 1 is copied |
| * to index one, and so forth until the double at index |
| * <tt>limit()</tt> - 1 is copied to index |
| * <i>n</i> = <tt>limit()</tt> - <tt>1</tt> - <i>p</i>. |
| * The buffer's position is then set to <i>n+1</i> and its limit is set to |
| * its capacity. The mark, if defined, is discarded. |
| * |
| * <p> The buffer's position is set to the number of doubles copied, |
| * rather than to zero, so that an invocation of this method can be |
| * followed immediately by an invocation of another relative <i>put</i> |
| * method. </p> |
| * |
| |
| * |
| * @return This buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract DoubleBuffer compact(); |
| |
| /** |
| * Tells whether or not this double buffer is direct. |
| * |
| * @return <tt>true</tt> if, and only if, this buffer is direct |
| */ |
| public abstract boolean isDirect(); |
| |
| |
| /** |
| * Returns a string summarizing the state of this buffer. |
| * |
| * @return A summary string |
| */ |
| public String toString() { |
| StringBuffer sb = new StringBuffer(); |
| sb.append(getClass().getName()); |
| sb.append("[pos="); |
| sb.append(position()); |
| sb.append(" lim="); |
| sb.append(limit()); |
| sb.append(" cap="); |
| sb.append(capacity()); |
| sb.append("]"); |
| return sb.toString(); |
| } |
| |
| |
| /** |
| * Returns the current hash code of this buffer. |
| * |
| * <p> The hash code of a double buffer depends only upon its remaining |
| * elements; that is, upon the elements from <tt>position()</tt> up to, and |
| * including, the element at <tt>limit()</tt> - <tt>1</tt>. |
| * |
| * <p> Because buffer hash codes are content-dependent, it is inadvisable |
| * to use buffers as keys in hash maps or similar data structures unless it |
| * is known that their contents will not change. </p> |
| * |
| * @return The current hash code of this buffer |
| */ |
| public int hashCode() { |
| int h = 1; |
| int p = position(); |
| for (int i = limit() - 1; i >= p; i--) |
| h = 31 * h + (int) get(i); |
| return h; |
| } |
| |
| /** |
| * Tells whether or not this buffer is equal to another object. |
| * |
| * <p> Two double buffers are equal if, and only if, |
| * |
| * <ol> |
| * |
| * <li><p> They have the same element type, </p></li> |
| * |
| * <li><p> They have the same number of remaining elements, and |
| * </p></li> |
| * |
| * <li><p> The two sequences of remaining elements, considered |
| * independently of their starting positions, are pointwise equal. |
| |
| * This method considers two double elements {@code a} and {@code b} |
| * to be equal if |
| * {@code (a == b) || (Double.isNaN(a) && Double.isNaN(b))}. |
| * The values {@code -0.0} and {@code +0.0} are considered to be |
| * equal, unlike {@link Double#equals(Object)}. |
| |
| * </p></li> |
| * |
| * </ol> |
| * |
| * <p> A double buffer is not equal to any other type of object. </p> |
| * |
| * @param ob The object to which this buffer is to be compared |
| * |
| * @return <tt>true</tt> if, and only if, this buffer is equal to the |
| * given object |
| */ |
| public boolean equals(Object ob) { |
| if (this == ob) |
| return true; |
| if (!(ob instanceof DoubleBuffer)) |
| return false; |
| DoubleBuffer that = (DoubleBuffer)ob; |
| if (this.remaining() != that.remaining()) |
| return false; |
| int p = this.position(); |
| for (int i = this.limit() - 1, j = that.limit() - 1; i >= p; i--, j--) |
| if (!equals(this.get(i), that.get(j))) |
| return false; |
| return true; |
| } |
| |
| private static boolean equals(double x, double y) { |
| |
| return (x == y) || (Double.isNaN(x) && Double.isNaN(y)); |
| |
| |
| } |
| |
| /** |
| * Compares this buffer to another. |
| * |
| * <p> Two double buffers are compared by comparing their sequences of |
| * remaining elements lexicographically, without regard to the starting |
| * position of each sequence within its corresponding buffer. |
| |
| * Pairs of {@code double} elements are compared as if by invoking |
| * {@link Double#compare(double,double)}, except that |
| * {@code -0.0} and {@code 0.0} are considered to be equal. |
| * {@code Double.NaN} is considered by this method to be equal |
| * to itself and greater than all other {@code double} values |
| * (including {@code Double.POSITIVE_INFINITY}). |
| |
| * |
| * <p> A double buffer is not comparable to any other type of object. |
| * |
| * @return A negative integer, zero, or a positive integer as this buffer |
| * is less than, equal to, or greater than the given buffer |
| */ |
| public int compareTo(DoubleBuffer that) { |
| int n = this.position() + Math.min(this.remaining(), that.remaining()); |
| for (int i = this.position(), j = that.position(); i < n; i++, j++) { |
| int cmp = compare(this.get(i), that.get(j)); |
| if (cmp != 0) |
| return cmp; |
| } |
| return this.remaining() - that.remaining(); |
| } |
| |
| private static int compare(double x, double y) { |
| |
| return ((x < y) ? -1 : |
| (x > y) ? +1 : |
| (x == y) ? 0 : |
| Double.isNaN(x) ? (Double.isNaN(y) ? 0 : +1) : -1); |
| |
| } |
| |
| // -- Other char stuff -- |
| |
| |
| // -- Other byte stuff: Access to binary data -- |
| |
| |
| /** |
| * Retrieves this buffer's byte order. |
| * |
| * <p> The byte order of a double buffer created by allocation or by |
| * wrapping an existing <tt>double</tt> array is the {@link |
| * ByteOrder#nativeOrder native order} of the underlying |
| * hardware. The byte order of a double buffer created as a <a |
| * href="ByteBuffer.html#views">view</a> of a byte buffer is that of the |
| * byte buffer at the moment that the view is created. </p> |
| * |
| * @return This buffer's byte order |
| */ |
| public abstract ByteOrder order(); |
| |
| |
| } |
