From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libjava/classpath/java/nio/DoubleBuffer.java | 386 +++++++++++++++++++++++++++ 1 file changed, 386 insertions(+) create mode 100644 libjava/classpath/java/nio/DoubleBuffer.java (limited to 'libjava/classpath/java/nio/DoubleBuffer.java') diff --git a/libjava/classpath/java/nio/DoubleBuffer.java b/libjava/classpath/java/nio/DoubleBuffer.java new file mode 100644 index 000000000..c17058c44 --- /dev/null +++ b/libjava/classpath/java/nio/DoubleBuffer.java @@ -0,0 +1,386 @@ +/* DoubleBuffer.java -- + Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.nio; + +// GCJ LOCAL: Change gnu.classpath.Pointer to RawData +import gnu.gcj.RawData; + +/** + * @since 1.4 + */ +public abstract class DoubleBuffer extends Buffer + implements Comparable +{ + final int array_offset; + final double[] backing_buffer; + + DoubleBuffer (int capacity, int limit, int position, int mark, + RawData address, double[] backing_buffer, int array_offset) + { + super (capacity, limit, position, mark, address); + this.backing_buffer = backing_buffer; + this.array_offset = array_offset; + } + + /** + * Allocates a new DoubleBuffer object with a given capacity. + */ + public static DoubleBuffer allocate (int capacity) + { + return new DoubleBufferImpl (capacity); + } + + /** + * Wraps a double array into a DoubleBuffer + * object. + * + * @exception IndexOutOfBoundsException If the preconditions on the offset + * and length parameters do not hold + */ + public static final DoubleBuffer wrap (double[] array, int offset, int length) + { + return new DoubleBufferImpl (array, 0, array.length, offset + length, offset, -1, false); + } + + /** + * Wraps a double array into a DoubleBuffer + * object. + */ + public static final DoubleBuffer wrap (double[] array) + { + return wrap (array, 0, array.length); + } + + /** + * This method transfers doubles from this buffer into the given + * destination array. Before the transfer, it checks if there are fewer than + * length doubles remaining in this buffer. + * + * @param dst The destination array + * @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 bytes to be written to the given array; + * must be non-negative and no larger than dst.length - offset. + * + * @exception BufferUnderflowException If there are fewer than length + * doubles remaining in this buffer. + * @exception IndexOutOfBoundsException If the preconditions on the offset + * and length parameters do not hold. + */ + public DoubleBuffer get (double[] dst, int offset, int length) + { + checkArraySize(dst.length, offset, length); + checkForUnderflow(length); + + for (int i = offset; i < offset + length; i++) + { + dst [i] = get (); + } + + return this; + } + + /** + * This method transfers doubles from this buffer into the given + * destination array. + * + * @param dst The byte array to write into. + * + * @exception BufferUnderflowException If there are fewer than dst.length + * doubles remaining in this buffer. + */ + public DoubleBuffer get (double[] dst) + { + return get (dst, 0, dst.length); + } + + /** + * Writes the content of the the DoubleBUFFER src + * into the buffer. Before the transfer, it checks if there is fewer than + * src.remaining() space remaining in this buffer. + * + * @param src The source data. + * + * @exception BufferOverflowException If there is insufficient space in this + * buffer for the remaining doubles in the source buffer. + * @exception IllegalArgumentException If the source buffer is this buffer. + * @exception ReadOnlyBufferException If this buffer is read-only. + */ + public DoubleBuffer put (DoubleBuffer src) + { + if (src == this) + throw new IllegalArgumentException (); + + checkForOverflow(src.remaining ()); + + if (src.remaining () > 0) + { + double[] toPut = new double [src.remaining ()]; + src.get (toPut); + put (toPut); + } + + return this; + } + + /** + * Writes the content of the the double array src + * into the buffer. Before the transfer, it checks if there is fewer than + * length space remaining in this buffer. + * + * @param src The array to copy into the buffer. + * @param offset The offset within the array of the first byte to be read; + * must be non-negative and no larger than src.length. + * @param length The number of bytes to be read from the given array; + * must be non-negative and no larger than src.length - offset. + * + * @exception BufferOverflowException If there is insufficient space in this + * buffer for the remaining doubles in the source array. + * @exception IndexOutOfBoundsException If the preconditions on the offset + * and length parameters do not hold + * @exception ReadOnlyBufferException If this buffer is read-only. + */ + public DoubleBuffer put (double[] src, int offset, int length) + { + checkArraySize(src.length, offset, length); + checkForOverflow(length); + + for (int i = offset; i < offset + length; i++) + put (src [i]); + + return this; + } + + /** + * Writes the content of the the double array src + * into the buffer. + * + * @param src The array to copy into the buffer. + * + * @exception BufferOverflowException If there is insufficient space in this + * buffer for the remaining doubles in the source array. + * @exception ReadOnlyBufferException If this buffer is read-only. + */ + public final DoubleBuffer put (double[] src) + { + return put (src, 0, src.length); + } + + /** + * Tells whether ot not this buffer is backed by an accessible + * double array. + */ + public final boolean hasArray () + { + return (backing_buffer != null + && !isReadOnly ()); + } + + /** + * Returns the double array that backs this buffer. + * + * @exception ReadOnlyBufferException If this buffer is read-only. + * @exception UnsupportedOperationException If this buffer is not backed + * by an accessible array. + */ + public final double[] array () + { + if (backing_buffer == null) + throw new UnsupportedOperationException (); + + checkIfReadOnly(); + + return backing_buffer; + } + + /** + * Returns the offset within this buffer's backing array of the first element. + * + * @exception ReadOnlyBufferException If this buffer is read-only. + * @exception UnsupportedOperationException If this buffer is not backed + * by an accessible array. + */ + public final int arrayOffset () + { + if (backing_buffer == null) + throw new UnsupportedOperationException (); + + checkIfReadOnly(); + + return array_offset; + } + + /** + * Calculates a hash code for this buffer. + * + * This is done with long arithmetic, + * where ** represents exponentiation, by this formula:
+ * s[position()] + 31 + (s[position()+1] + 30)*31**1 + ... + + * (s[limit()-1]+30)*31**(limit()-1). + * Where s is the buffer data, in Double.doubleToLongBits() form + * Note that the hashcode is dependent on buffer content, + * and therefore is not useful if the buffer content may change. + * + * @return the hash code (casted to int) + */ + public int hashCode () + { + long hashCode = Double.doubleToLongBits(get(position())) + 31; + long multiplier = 1; + for (int i = position() + 1; i < limit(); ++i) + { + multiplier *= 31; + hashCode += (Double.doubleToLongBits(get(i)) + 30)*multiplier; + } + return ((int)hashCode); + } + + /** + * Checks if this buffer is equal to obj. + */ + public boolean equals (Object obj) + { + if (obj instanceof DoubleBuffer) + { + return compareTo ((DoubleBuffer) obj) == 0; + } + + return false; + } + + /** + * Compares two DoubleBuffer objects. + * + * @exception ClassCastException If obj is not an object derived from + * DoubleBuffer. + */ + public int compareTo (DoubleBuffer other) + { + int num = Math.min(remaining(), other.remaining()); + int pos_this = position(); + int pos_other = other.position(); + + for (int count = 0; count < num; count++) + { + double a = get(pos_this++); + double b = other.get(pos_other++); + + if (a == b) + continue; + + if (a < b) + return -1; + + return 1; + } + + return remaining() - other.remaining(); + } + + /** + * Returns the byte order of this buffer. + */ + public abstract ByteOrder order (); + + /** + * Reads the double at this buffer's current position, + * and then increments the position. + * + * @exception BufferUnderflowException If there are no remaining + * doubles in this buffer. + */ + public abstract double get (); + + /** + * Writes the double at this buffer's current position, + * and then increments the position. + * + * @exception BufferOverflowException If there no remaining + * doubles in this buffer. + * @exception ReadOnlyBufferException If this buffer is read-only. + */ + public abstract DoubleBuffer put (double b); + + /** + * Absolute get method. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit. + */ + public abstract double get (int index); + + /** + * Absolute put method. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit. + * @exception ReadOnlyBufferException If this buffer is read-only. + */ + public abstract DoubleBuffer put (int index, double b); + + /** + * Compacts this buffer. + * + * @exception ReadOnlyBufferException If this buffer is read-only. + */ + public abstract DoubleBuffer compact (); + + /** + * Tells wether or not this buffer is direct. + */ + public abstract boolean isDirect (); + + /** + * Creates a new DoubleBuffer whose content is a shared + * subsequence of this buffer's content. + */ + public abstract DoubleBuffer slice (); + + /** + * Creates a new DoubleBuffer that shares this buffer's + * content. + */ + public abstract DoubleBuffer duplicate (); + + /** + * Creates a new read-only DoubleBuffer that shares this + * buffer's content. + */ + public abstract DoubleBuffer asReadOnlyBuffer (); +} -- cgit v1.2.3