Source Code Cross Referenced for AppendableWriter.java in  » Science » javolution-5.2 » javolution » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » javolution 5.2 » javolution.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Javolution - Java(TM) Solution for Real-Time and Embedded Systems
003:         * Copyright (C) 2006 - Javolution (http://javolution.org/)
004:         * All rights reserved.
005:         * 
006:         * Permission to use, copy, modify, and distribute this software is
007:         * freely granted, provided that this notice is preserved.
008:         */
009:        package javolution.io;
010:
011:        import j2me.lang.CharSequence;
012:        import j2me.lang.IllegalStateException;
013:        import j2me.lang.UnsupportedOperationException;
014:
015:        import java.io.IOException;
016:        import java.io.Writer;
017:        import javolution.lang.Reusable;
018:        import javolution.text.Appendable;
019:        import javolution.text.Text;
020:
021:        /**
022:         * <p> This class allows any <code>Appendable</code> to be used as 
023:         *     a writer.</p>
024:         *
025:         * @author  <a href="mailto:jean-marie@dautelle.com">Jean-Marie Dautelle</a>
026:         * @version 3.8, May 8, 2006
027:         */
028:        public final class AppendableWriter extends Writer implements  Reusable {
029:
030:            /**
031:             * Holds the current appendable output or <code>null</code> if closed.
032:             */
033:            private Appendable _output;
034:
035:            /**
036:             * Creates a new appendable writer for which the appendable output 
037:             * is not set.
038:             * 
039:             * @see #setOutput(Appendable)
040:             */
041:            public AppendableWriter() {
042:            }
043:
044:            /**
045:             * Sets the appendable output being written to.
046:             * For example:[code]
047:             *     Writer writer = new AppendableWriter().setOutput(new TextBuilder());
048:             * [/code]
049:             *
050:             * @param  output the appendable written to.
051:             * @return this writer.
052:             * @throws IllegalStateException if this writer is being reused and 
053:             *         it has not been {@link #close closed} or {@link #reset reset}.
054:             */
055:            public AppendableWriter setOutput(Appendable output) {
056:                if (_output != null)
057:                    throw new IllegalStateException(
058:                            "Writer not closed or reset");
059:                _output = output;
060:                return this ;
061:            }
062:
063:            /**
064:             * Writes a single character.
065:             *
066:             * @param  c <code>char</code> the character to be written.
067:             * @throws IOException if an I/O error occurs.
068:             */
069:            public void write(char c) throws IOException {
070:                if (_output == null)
071:                    throw new IOException("Writer closed");
072:                _output.append(c);
073:            }
074:
075:            /**
076:             * Writes the 16 low-order bits of the given integer value;
077:             * the 16 high-order bits are ignored.
078:             *
079:             * @param  c the value of the character to be written.
080:             * @throws IOException if an I/O error occurs.
081:             */
082:            public void write(int c) throws IOException {
083:                if (_output == null)
084:                    throw new IOException("Writer closed");
085:                _output.append((char) c);
086:            }
087:
088:            /**
089:             * Writes a portion of an array of characters.
090:             *
091:             * @param  cbuf the array of characters.
092:             * @param  off the offset from which to start writing characters.
093:             * @param  len the number of characters to write.
094:             * @throws IOException if an I/O error occurs.
095:             */
096:            public void write(char cbuf[], int off, int len) throws IOException {
097:                if (_output == null)
098:                    throw new IOException("Writer closed");
099:                _tmpBuffer = cbuf;
100:                _output.append(_tmpBufferAsCharSequence, off, off + len);
101:                _tmpBuffer = null; // Removes temporary references.
102:            }
103:
104:            private char[] _tmpBuffer;
105:
106:            private final CharSequence _tmpBufferAsCharSequence = new CharSequence() {
107:                public int length() {
108:                    return _tmpBuffer.length;
109:                }
110:
111:                public char charAt(int index) {
112:                    return _tmpBuffer[index];
113:                }
114:
115:                public CharSequence subSequence(int start, int end) {
116:                    throw new UnsupportedOperationException();
117:                }
118:            };
119:
120:            /**
121:             * Writes a portion of a string.
122:             *
123:             * @param  str a String.
124:             * @param  off the offset from which to start writing characters.
125:             * @param  len the number of characters to write.
126:             * @throws IOException if an I/O error occurs
127:             */
128:            public void write(String str, int off, int len) throws IOException {
129:                if (_output == null)
130:                    throw new IOException("Writer closed");
131:                Object obj = str;
132:                if (obj instanceof  CharSequence) {
133:                    _output.append((CharSequence) obj);
134:                } else {
135:                    _output.append(Text.valueOf(str));
136:                }
137:            }
138:
139:            /**
140:             * Writes the specified character sequence.
141:             *
142:             * @param  csq the character sequence.
143:             * @throws IOException if an I/O error occurs
144:             */
145:            public void write(CharSequence csq) throws IOException {
146:                if (_output == null)
147:                    throw new IOException("Writer closed");
148:                _output.append(csq);
149:            }
150:
151:            /**
152:             * Flushes the stream.
153:             */
154:            public void flush() {
155:                // Do nothing (no buffer).
156:            }
157:
158:            /**
159:             * Closes and {@link #reset resets} this writer for reuse.
160:             */
161:            public void close() {
162:                if (_output != null) {
163:                    reset();
164:                }
165:            }
166:
167:            // Implements Reusable.
168:            public void reset() {
169:                _output = null;
170:                _tmpBuffer = null;
171:            }
172:        }
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