/* * Copyright (c) 2000, 2008, 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; /** * A double buffer. * *

This class defines four categories of operations upon * double buffers: * *

* *

Double buffers can be created either by {@link #allocate * allocation}, which allocates space for the buffer's * content, by {@link #wrap(double[]) wrapping} an existing * double array into a buffer, or by creating a * view of an existing byte buffer. * *

Like a byte buffer, a double buffer is either direct or non-direct. A * double buffer created via the wrap 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.

* *

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 { // 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) { super(mark, pos, lim, cap, 3); 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. * *

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 capacity 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. * *

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 * array.length, its position will be offset, its limit * will be offset + length, 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.

* * @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 array.length. 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 * array.length - offset. * The new buffer's limit will be set to offset + length. * @return The new double buffer * @throws IndexOutOfBoundsException If the preconditions on the offset and * length * 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. * *

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 * array.length, 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.

* * @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. * *

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. * *

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.

* * @return The new double buffer */ public abstract DoubleBuffer slice(); /** * Creates a new double buffer that shares this buffer's content. * *

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. * *

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.

* * @return The new double buffer */ public abstract DoubleBuffer duplicate(); /** * Creates a new, read-only double buffer that shares this buffer's * content. * *

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. * *

The new buffer's capacity, limit, position, and mark values will be * identical to those of this buffer. * *

If this buffer is itself read-only then this method behaves in * exactly the same way as the {@link #duplicate duplicate} method.

* * @return The new, read-only double buffer */ public abstract DoubleBuffer asReadOnlyBuffer(); // -- Singleton get/put methods -- /** * Relative get 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 put method  (optional operation). * *

Writes the given double into this buffer at the current * position, and then increments the position.

* * @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 get 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 index is negative * or not smaller than the buffer's limit */ public abstract double get(int index); /** * Absolute put method  (optional operation). * *

Writes the given double into this buffer at the given * index.

* * @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 index 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 get method. * *

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 * length > remaining(), then no * doubles are transferred and a {@link BufferUnderflowException} is * thrown. * *

Otherwise, this method copies length 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 length. * *

In other words, an invocation of this method of the form * src.get(dst, off, len) has exactly the same effect as * the loop * * 

     *     for (int i = off; i < off + len; i++)
     *         dst[i] = src.get();
* * 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 * dst.length * @param length The maximum number of doubles to be written to the given * array; must be non-negative and no larger than * dst.length - offset * @return This buffer * @throws BufferUnderflowException If there are fewer than length doubles * remaining in this buffer * @throws IndexOutOfBoundsException If the preconditions on the offset and * length * 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 get method. * *

This method transfers doubles from this buffer into the given * destination array. An invocation of this method of the form * src.get(a) behaves in exactly the same way as the invocation * * 

     *     src.get(a, 0, a.length)
* * @return This buffer * @throws BufferUnderflowException If there are fewer than length doubles * remaining in this buffer */ public DoubleBuffer get(double[] dst) { return get(dst, 0, dst.length); } // -- Bulk put operations -- /** * Relative bulk put method  (optional operation). * *

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 * src.remaining() > remaining(), * then no doubles are transferred and a {@link * BufferOverflowException} is thrown. * *

Otherwise, this method copies * n = src.remaining() doubles from the given * buffer into this buffer, starting at each buffer's current position. * The positions of both buffers are then incremented by n. * *

In other words, an invocation of this method of the form * dst.put(src) has exactly the same effect as the loop * * 

     *     while (src.hasRemaining())
     *         dst.put(src.get());
* * 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(); int n = src.remaining(); if (n > remaining()) throw new BufferOverflowException(); for (int i = 0; i < n; i++) put(src.get()); return this; } /** * Relative bulk put method  (optional operation). * *

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 * length > remaining(), then no * doubles are transferred and a {@link BufferOverflowException} is * thrown. * *

Otherwise, this method copies length 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 length. * *

In other words, an invocation of this method of the form * dst.put(src, off, len) has exactly the same effect as * the loop * * 

     *     for (int i = off; i < off + len; i++)
     *         dst.put(a[i]);
* * 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 array.length * @param length The number of doubles to be read from the given array; * must be non-negative and no larger than * array.length - offset * @return This buffer * @throws BufferOverflowException If there is insufficient space in this buffer * @throws IndexOutOfBoundsException If the preconditions on the offset and * length * 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 put method  (optional operation). * *

This method transfers the entire content of the given source * double array into this buffer. An invocation of this method of the * form dst.put(a) behaves in exactly the same way as the * invocation * * 

     *     dst.put(a, 0, a.length)
* * @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. * *

If this method returns true then the {@link #array() array} * and {@link #arrayOffset() arrayOffset} methods may safely be invoked. *

* * @return true 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  (optional operation). * *

Modifications to this buffer's content will cause the returned * array's content to be modified, and vice versa. * *

Invoke the {@link #hasArray hasArray} method before invoking this * method in order to ensure that this buffer has an accessible backing * array.

* * @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  (optional operation). * *

If this buffer is backed by an array then buffer position p * corresponds to array index p + arrayOffset(). * *

Invoke the {@link #hasArray hasArray} method before invoking this * method in order to ensure that this buffer has an accessible backing * array.

* * @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; } /** * Compacts this buffer  (optional operation). * *

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 p = position() is copied * to index zero, the double at index p + 1 is copied * to index one, and so forth until the double at index * limit() - 1 is copied to index * n = limit() - 1 - p. * The buffer's position is then set to n+1 and its limit is set to * its capacity. The mark, if defined, is discarded. * *

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 put * method.

* * @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 true 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. * *

The hash code of a double buffer depends only upon its remaining * elements; that is, upon the elements from position() up to, and * including, the element at limit() - 1. * *

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.

* * @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. * *

Two double buffers are equal if, and only if, * *

    * *

  1. They have the same element type,

    2. * *

  2. They have the same number of remaining elements, and *

    3. * *

  3. 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)}. * *

    4. * *
* *

A double buffer is not equal to any other type of object.

* * @param ob The object to which this buffer is to be compared * @return true 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. * *

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}). * * * * * *

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++) { // Android-changed: Call through to Double.compare() instead of // duplicating code pointlessly. int cmp = Double.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. * *

The byte order of a double buffer created by allocation or by * wrapping an existing double array is the {@link * ByteOrder#nativeOrder native order} of the underlying * hardware. The byte order of a double buffer created as a view of a byte buffer is that of the * byte buffer at the moment that the view is created.

* * @return This buffer's byte order */ public abstract ByteOrder order(); }