Source Code Cross Referenced for Pipe.java in  » Apache-Harmony-Java-SE » java-package » java » nio » channels » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.nio.channels 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Licensed to the Apache Software Foundation (ASF) under one or more
002:         * contributor license agreements.  See the NOTICE file distributed with
003:         * this work for additional information regarding copyright ownership.
004:         * The ASF licenses this file to You under the Apache License, Version 2.0
005:         * (the "License"); you may not use this file except in compliance with
006:         * the License.  You may obtain a copy of the License at
007:         * 
008:         *     http://www.apache.org/licenses/LICENSE-2.0
009:         * 
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package java.nio.channels;
018:
019:        import java.io.IOException;
020:        import java.nio.channels.spi.AbstractSelectableChannel;
021:        import java.nio.channels.spi.SelectorProvider;
022:
023:        /**
024:         * A pipe contains two channels. One is the writable sink channel and the other is
025:         * readable source channel. When bytes are written into the writable channel they
026:         * can be read from readable channel. The order of these bytes remains unchanged. 
027:         */
028:        public abstract class Pipe {
029:
030:            /**
031:             * Writable sink channel for writing into.
032:             */
033:            public static abstract class SinkChannel extends
034:                    AbstractSelectableChannel implements  WritableByteChannel,
035:                    GatheringByteChannel {
036:
037:                /**
038:                 * The Constructor.
039:                 * 
040:                 * @param provider
041:                 *            the provider of the channel
042:                 */
043:                protected SinkChannel(SelectorProvider provider) {
044:                    super (provider);
045:                }
046:
047:                /**
048:                 * Indicates this channel supports only writing.
049:                 * 
050:                 * @return a static value of OP_WRITE
051:                 */
052:                @Override
053:                public final int validOps() {
054:                    return SelectionKey.OP_WRITE;
055:                }
056:            }
057:
058:            /**
059:             * Readable source channel for reading from.
060:             */
061:            public static abstract class SourceChannel extends
062:                    AbstractSelectableChannel implements  ReadableByteChannel,
063:                    ScatteringByteChannel {
064:
065:                /**
066:                 * The Constructor.
067:                 * 
068:                 * @param provider
069:                 *            the provider of the channel
070:                 */
071:                protected SourceChannel(SelectorProvider provider) {
072:                    super (provider);
073:                }
074:
075:                /**
076:                 * Indicates this channel supports only reading.
077:                 * 
078:                 * @return a static value of OP_READ
079:                 */
080:                @Override
081:                public final int validOps() {
082:                    return SelectionKey.OP_READ;
083:                }
084:
085:            }
086:
087:            /**
088:             * Initializes a pipe.
089:             * 
090:             * @return a new instance of pipe
091:             * 
092:             * @throws IOException
093:             *             if I/O error occurs
094:             */
095:            public static Pipe open() throws IOException {
096:                return SelectorProvider.provider().openPipe();
097:            }
098:
099:            /**
100:             * The protected constructor.
101:             */
102:            protected Pipe() {
103:                super ();
104:            }
105:
106:            /**
107:             * Returns the sink channel of the pipe.
108:             * 
109:             * @return a writable sink channel of the pipe
110:             */
111:            public abstract SinkChannel sink();
112:
113:            /**
114:             * Returns the source channel of the pipe.
115:             * 
116:             * @return a readable source channel of the pipe
117:             */
118:            public abstract SourceChannel source();
119:
120:        }
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