Source Code Cross Referenced for FilterOutputStream.java in  » Apache-Harmony-Java-SE » java-package » java » io » 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.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Licensed to the Apache Software Foundation (ASF) under one or more
003:         *  contributor license agreements.  See the NOTICE file distributed with
004:         *  this work for additional information regarding copyright ownership.
005:         *  The ASF licenses this file to You under the Apache License, Version 2.0
006:         *  (the "License"); you may not use this file except in compliance with
007:         *  the License.  You may obtain a copy of the License at
008:         *
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         *  Unless required by applicable law or agreed to in writing, software
012:         *  distributed under the License is distributed on an "AS IS" BASIS,
013:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         *  See the License for the specific language governing permissions and
015:         *  limitations under the License.
016:         */
017:
018:        package java.io;
019:
020:        import org.apache.harmony.luni.util.Msg;
021:
022:        /**
023:         * FilteredOutputStream is a class which takes an output stream and
024:         * <em>filters</em> the output in some way. The filtered view may be a
025:         * buffered output or one which compresses data before actually writing the
026:         * bytes. FilterOutputStreams are meant for byte streams.
027:         * 
028:         * @see FilterInputStream
029:         */
030:        public class FilterOutputStream extends OutputStream {
031:
032:            /**
033:             * The target OutputStream for this filter.
034:             */
035:            protected OutputStream out;
036:
037:            /**
038:             * Constructs a new FilterOutputStream on the OutputStream <code>out</code>.
039:             * All writes are now filtered through this stream.
040:             * 
041:             * @param out
042:             *            the target OutputStream to filter writes on.
043:             */
044:            public FilterOutputStream(OutputStream out) {
045:                this .out = out;
046:            }
047:
048:            /**
049:             * Close this FilterOutputStream. This implementation closes the target
050:             * stream.
051:             * 
052:             * @throws IOException
053:             *             If an error occurs attempting to close this stream.
054:             */
055:            @Override
056:            public void close() throws IOException {
057:                try {
058:                    flush();
059:                } catch (IOException e) {
060:                    // Ignored
061:                }
062:                /* Make sure we clean up this stream if exception fires */
063:                out.close();
064:            }
065:
066:            /**
067:             * Flush this FilterOutputStream to ensure all pending data is sent out to
068:             * the target OutputStream. This implementation flushes the target
069:             * OutputStream.
070:             * 
071:             * @throws IOException
072:             *             If an error occurs attempting to flush this
073:             *             FilterOutputStream.
074:             */
075:            @Override
076:            public void flush() throws IOException {
077:                out.flush();
078:            }
079:
080:            /**
081:             * Writes the entire contents of the byte array <code>buffer</code> to
082:             * this FilterOutputStream. This implementation writes the
083:             * <code>buffer</code> to the target stream.
084:             * 
085:             * @param buffer
086:             *            the buffer to be written
087:             * 
088:             * @throws IOException
089:             *             If an error occurs attempting to write to this
090:             *             FilterOutputStream.
091:             */
092:            @Override
093:            public void write(byte buffer[]) throws IOException {
094:                write(buffer, 0, buffer.length);
095:            }
096:
097:            /**
098:             * Writes <code>count</code> <code>bytes</code> from the byte array
099:             * <code>buffer</code> starting at <code>offset</code> to this
100:             * FilterOutputStream. This implementation writes the <code>buffer</code>
101:             * to the target OutputStream.
102:             * 
103:             * @param buffer
104:             *            the buffer to be written
105:             * @param offset
106:             *            offset in buffer to get bytes
107:             * @param count
108:             *            number of bytes in buffer to write
109:             * 
110:             * @throws IOException
111:             *             If an error occurs attempting to write to this
112:             *             FilterOutputStream.
113:             * @throws IndexOutOfBoundsException
114:             *             If offset or count are outside of bounds.
115:             */
116:            @Override
117:            public void write(byte buffer[], int offset, int count)
118:                    throws IOException {
119:                // avoid int overflow, force null buffer check first
120:                if (offset > buffer.length || offset < 0 || count < 0
121:                        || count > buffer.length - offset) {
122:                    throw new ArrayIndexOutOfBoundsException(Msg
123:                            .getString("K002f")); //$NON-NLS-1$
124:                }
125:                for (int i = 0; i < count; i++) {
126:                    // Call write() instead of out.write() since subclasses could
127:                    // override the write() method.
128:                    write(buffer[offset + i]);
129:                }
130:            }
131:
132:            /**
133:             * Writes the specified byte <code>oneByte</code> to this
134:             * FilterOutputStream. Only the low order byte of <code>oneByte</code> is
135:             * written. This implementation writes the byte to the target OutputStream.
136:             * 
137:             * @param oneByte
138:             *            the byte to be written
139:             * 
140:             * @throws IOException
141:             *             If an error occurs attempting to write to this
142:             *             FilterOutputStream.
143:             */
144:            @Override
145:            public void write(int oneByte) throws IOException {
146:                out.write(oneByte);
147:            }
148:        }
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