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| 1 | /* | ||
| 2 | * Copyright (c) 2000, 2006, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package java.nio.channels; | ||
| 27 | |||
| 28 | import java.io.IOException; | ||
| 29 | import java.nio.ByteBuffer; | ||
| 30 | |||
| 31 | |||
| 32 | /** | ||
| 33 | * A channel that can read bytes into a sequence of buffers. | ||
| 34 | * | ||
| 35 | * <p> A <i>scattering</i> read operation reads, in a single invocation, a | ||
| 36 | * sequence of bytes into one or more of a given sequence of buffers. | ||
| 37 | * Scattering reads are often useful when implementing network protocols or | ||
| 38 | * file formats that, for example, group data into segments consisting of one | ||
| 39 | * or more fixed-length headers followed by a variable-length body. Similar | ||
| 40 | * <i>gathering</i> write operations are defined in the {@link | ||
| 41 | * GatheringByteChannel} interface. </p> | ||
| 42 | * | ||
| 43 | * | ||
| 44 | * @author Mark Reinhold | ||
| 45 | * @author JSR-51 Expert Group | ||
| 46 | * @since 1.4 | ||
| 47 | */ | ||
| 48 | |||
| 49 | public interface ScatteringByteChannel | ||
| 50 | extends ReadableByteChannel | ||
| 51 | { | ||
| 52 | |||
| 53 | /** | ||
| 54 | * Reads a sequence of bytes from this channel into a subsequence of the | ||
| 55 | * given buffers. | ||
| 56 | * | ||
| 57 | * <p> An invocation of this method attempts to read up to <i>r</i> bytes | ||
| 58 | * from this channel, where <i>r</i> is the total number of bytes remaining | ||
| 59 | * the specified subsequence of the given buffer array, that is, | ||
| 60 | * | ||
| 61 | * <blockquote><pre> | ||
| 62 | * dsts[offset].remaining() | ||
| 63 | * + dsts[offset+1].remaining() | ||
| 64 | * + ... + dsts[offset+length-1].remaining()</pre></blockquote> | ||
| 65 | * | ||
| 66 | * at the moment that this method is invoked. | ||
| 67 | * | ||
| 68 | * <p> Suppose that a byte sequence of length <i>n</i> is read, where | ||
| 69 | * <tt>0</tt> <tt><=</tt> <i>n</i> <tt><=</tt> <i>r</i>. | ||
| 70 | * Up to the first <tt>dsts[offset].remaining()</tt> bytes of this sequence | ||
| 71 | * are transferred into buffer <tt>dsts[offset]</tt>, up to the next | ||
| 72 | * <tt>dsts[offset+1].remaining()</tt> bytes are transferred into buffer | ||
| 73 | * <tt>dsts[offset+1]</tt>, and so forth, until the entire byte sequence | ||
| 74 | * is transferred into the given buffers. As many bytes as possible are | ||
| 75 | * transferred into each buffer, hence the final position of each updated | ||
| 76 | * buffer, except the last updated buffer, is guaranteed to be equal to | ||
| 77 | * that buffer's limit. | ||
| 78 | * | ||
| 79 | * <p> This method may be invoked at any time. If another thread has | ||
| 80 | * already initiated a read operation upon this channel, however, then an | ||
| 81 | * invocation of this method will block until the first operation is | ||
| 82 | * complete. </p> | ||
| 83 | * | ||
| 84 | * @param dsts | ||
| 85 | * The buffers into which bytes are to be transferred | ||
| 86 | * | ||
| 87 | * @param offset | ||
| 88 | * The offset within the buffer array of the first buffer into | ||
| 89 | * which bytes are to be transferred; must be non-negative and no | ||
| 90 | * larger than <tt>dsts.length</tt> | ||
| 91 | * | ||
| 92 | * @param length | ||
| 93 | * The maximum number of buffers to be accessed; must be | ||
| 94 | * non-negative and no larger than | ||
| 95 | * <tt>dsts.length</tt> - <tt>offset</tt> | ||
| 96 | * | ||
| 97 | * @return The number of bytes read, possibly zero, | ||
| 98 | * or <tt>-1</tt> if the channel has reached end-of-stream | ||
| 99 | * | ||
| 100 | * @throws IndexOutOfBoundsException | ||
| 101 | * If the preconditions on the <tt>offset</tt> and <tt>length</tt> | ||
| 102 | * parameters do not hold | ||
| 103 | * | ||
| 104 | * @throws NonReadableChannelException | ||
| 105 | * If this channel was not opened for reading | ||
| 106 | * | ||
| 107 | * @throws ClosedChannelException | ||
| 108 | * If this channel is closed | ||
| 109 | * | ||
| 110 | * @throws AsynchronousCloseException | ||
| 111 | * If another thread closes this channel | ||
| 112 | * while the read operation is in progress | ||
| 113 | * | ||
| 114 | * @throws ClosedByInterruptException | ||
| 115 | * If another thread interrupts the current thread | ||
| 116 | * while the read operation is in progress, thereby | ||
| 117 | * closing the channel and setting the current thread's | ||
| 118 | * interrupt status | ||
| 119 | * | ||
| 120 | * @throws IOException | ||
| 121 | * If some other I/O error occurs | ||
| 122 | */ | ||
| 123 | public long read(ByteBuffer[] dsts, int offset, int length) | ||
| 124 | throws IOException; | ||
| 125 | |||
| 126 | /** | ||
| 127 | * Reads a sequence of bytes from this channel into the given buffers. | ||
| 128 | * | ||
| 129 | * <p> An invocation of this method of the form <tt>c.read(dsts)</tt> | ||
| 130 | * behaves in exactly the same manner as the invocation | ||
| 131 | * | ||
| 132 | * <blockquote><pre> | ||
| 133 | * c.read(dsts, 0, dsts.length);</pre></blockquote> | ||
| 134 | * | ||
| 135 | * @param dsts | ||
| 136 | * The buffers into which bytes are to be transferred | ||
| 137 | * | ||
| 138 | * @return The number of bytes read, possibly zero, | ||
| 139 | * or <tt>-1</tt> if the channel has reached end-of-stream | ||
| 140 | * | ||
| 141 | * @throws NonReadableChannelException | ||
| 142 | * If this channel was not opened for reading | ||
| 143 | * | ||
| 144 | * @throws ClosedChannelException | ||
| 145 | * If this channel is closed | ||
| 146 | * | ||
| 147 | * @throws AsynchronousCloseException | ||
| 148 | * If another thread closes this channel | ||
| 149 | * while the read operation is in progress | ||
| 150 | * | ||
| 151 | * @throws ClosedByInterruptException | ||
| 152 | * If another thread interrupts the current thread | ||
| 153 | * while the read operation is in progress, thereby | ||
| 154 | * closing the channel and setting the current thread's | ||
| 155 | * interrupt status | ||
| 156 | * | ||
| 157 | * @throws IOException | ||
| 158 | * If some other I/O error occurs | ||
| 159 | */ | ||
| 160 | public long read(ByteBuffer[] dsts) throws IOException; | ||
| 161 | |||
| 162 | } | ||