Source Code Cross Referenced for JTextAreaWriter.java in  » Web-Framework » jpublish » com » anthonyeden » lib » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » jpublish » com.anthonyeden.lib.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*-- 
002:
003:         Copyright (C) 2000-2003 Anthony Eden.
004:         All rights reserved.
005:         
006:         Redistribution and use in source and binary forms, with or without
007:         modification, are permitted provided that the following conditions
008:         are met:
009:         
010:         1. Redistributions of source code must retain the above copyright
011:            notice, this list of conditions, and the following disclaimer.
012:         
013:         2. Redistributions in binary form must reproduce the above copyright
014:            notice, this list of conditions, and the disclaimer that follows 
015:            these conditions in the documentation and/or other materials 
016:            provided with the distribution.
017:
018:         3. The name "EdenLib" must not be used to endorse or promote products
019:            derived from this software without prior written permission.  For
020:            written permission, please contact me@anthonyeden.com.
021:         
022:         4. Products derived from this software may not be called "EdenLib", nor
023:            may "EdenLib" appear in their name, without prior written permission
024:            from Anthony Eden (me@anthonyeden.com).
025:         
026:         In addition, I request (but do not require) that you include in the 
027:         end-user documentation provided with the redistribution and/or in the 
028:         software itself an acknowledgement equivalent to the following:
029:             "This product includes software developed by
030:              Anthony Eden (http://www.anthonyeden.com/)."
031:
032:         THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
033:         WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
034:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
035:         DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, 
036:         INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
037:         (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
038:         SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
039:         HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
040:         STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
041:         IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
042:         POSSIBILITY OF SUCH DAMAGE.
043:
044:         For more information on EdenLib, please see <http://edenlib.sf.net/>.
045:         
046:         */
047:
048:        package com.anthonyeden.lib.io;
049:
050:        import java.io.Writer;
051:        import java.io.IOException;
052:
053:        import javax.swing.JTextArea;
054:
055:        /** A implementation of the java.io.Writer class which provides writing to a
056:         JTextArea via a stream.
057:        
058:         <p><b>Note:</b> There appears to be bug in the Macintosh implementation of 
059:         the JDK 1.1 where a PrintWriter writing to this class will not include the 
060:         correct line feeds for display in a JTextArea.  There is a simple test of
061:         the "java.version" system property which, if it starts with the String "1.1"
062:         will cause newlines to be written each time the buffer is flushed.</p>
063:        
064:         @author Anthony Eden
065:         */
066:
067:        public class JTextAreaWriter extends Writer {
068:
069:            private boolean closed = false;
070:            private JTextArea textArea;
071:            private StringBuffer buffer;
072:
073:            /** Constructor.
074:            
075:                @param textArea The JTextArea to write to.
076:             */
077:
078:            public JTextAreaWriter(JTextArea textArea) {
079:                setTextArea(textArea);
080:            }
081:
082:            /** Set the JTextArea to write to.
083:            
084:                @param textArea The JTextArea
085:             */
086:
087:            public void setTextArea(JTextArea textArea) {
088:                if (textArea == null) {
089:                    throw new IllegalArgumentException(
090:                            "The text area must not be null.");
091:                }
092:                this .textArea = textArea;
093:            }
094:
095:            /** Close the stream. */
096:
097:            public void close() {
098:                closed = true;
099:            }
100:
101:            /** Flush the data that is currently in the buffer.
102:            
103:                @throws IOException
104:             */
105:
106:            public void flush() throws IOException {
107:                if (closed) {
108:                    throw new IOException("The stream is not open.");
109:                }
110:                // the newline character should not be necessary.  The PrintWriter
111:                // should autmatically put the newline, but it doesn't seem to work
112:                textArea.append(getBuffer().toString());
113:                if (System.getProperty("java.version").startsWith("1.1")) {
114:                    textArea.append("\n");
115:                }
116:                textArea.setCaretPosition(textArea.getDocument().getLength());
117:                buffer = null;
118:            }
119:
120:            /** Write the given character array to the output stream.
121:            
122:                @param charArray The character array
123:                @throws IOException
124:             */
125:
126:            public void write(char[] charArray) throws IOException {
127:                write(charArray, 0, charArray.length);
128:            }
129:
130:            /** Write the given character array to the output stream beginning from
131:                the given offset and proceeding to until the given length is reached.
132:            
133:                @param charArray The character array
134:                @param offset The start offset
135:                @param length The length to write
136:                @throws IOException
137:             */
138:
139:            public void write(char[] charArray, int offset, int length)
140:                    throws IOException {
141:                if (closed) {
142:                    throw new IOException("The stream is not open.");
143:                }
144:                getBuffer().append(charArray, offset, length);
145:            }
146:
147:            /** Write the given character to the output stream.
148:            
149:                @param c The character
150:                @throws IOException
151:             */
152:
153:            public void write(int c) throws IOException {
154:                if (closed) {
155:                    throw new IOException("The stream is not open.");
156:                }
157:                getBuffer().append((char) c);
158:            }
159:
160:            /** Write the given String to the output stream.
161:            
162:                @param string The String
163:                @throws IOException
164:             */
165:
166:            public void write(String string) throws IOException {
167:                if (closed) {
168:                    throw new IOException("The stream is not open.");
169:                }
170:                getBuffer().append(string);
171:            }
172:
173:            /** Write the given String to the output stream beginning from the given offset 
174:                and proceeding to until the given length is reached.
175:            
176:                @param string The String
177:                @param offset The start offset
178:                @param length The length to write
179:                @throws IOException
180:             */
181:
182:            public void write(String string, int offset, int length)
183:                    throws IOException {
184:                if (closed) {
185:                    throw new IOException("The stream is not open.");
186:                }
187:                getBuffer().append(string.substring(offset, length));
188:            }
189:
190:            // protected methods
191:
192:            /** Get the StringBuffer which holds the data prior to writing via
193:                a call to the <code>flush()</code> method.  This method should
194:                never return null.
195:                
196:                @return A StringBuffer
197:             */
198:
199:            protected StringBuffer getBuffer() {
200:                if (buffer == null) {
201:                    buffer = new StringBuffer();
202:                }
203:                return buffer;
204:            }
205:
206:        }
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