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Java > Open Source Codes > org > codehaus > groovy > runtime > StringBufferWriter


1 /*
2  * $Id: StringBufferWriter.java,v 1.1 2004/01/27 20:55:44 jstrachan Exp $
3  *
4  * Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
5  *
6  * Redistribution and use of this software and associated documentation
7  * ("Software"), with or without modification, are permitted provided that the
8  * following conditions are met: 1. Redistributions of source code must retain
9  * copyright statements and notices. Redistributions must also contain a copy
10  * of this document. 2. Redistributions in binary form must reproduce the above
11  * copyright notice, this list of conditions and the following disclaimer in
12  * the documentation and/or other materials provided with the distribution. 3.
13  * The name "groovy" must not be used to endorse or promote products derived
14  * from this Software without prior written permission of The Codehaus. For
15  * written permission, please contact info@codehaus.org. 4. Products derived
16  * from this Software may not be called "groovy" nor may "groovy" appear in
17  * their names without prior written permission of The Codehaus. "groovy" is a
18  * registered trademark of The Codehaus. 5. Due credit should be given to The
19  * Codehaus - http://groovy.codehaus.org/
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY
22  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24  * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR
25  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
27  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
28  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
31  * DAMAGE.
32  *
33  */
34 package org.codehaus.groovy.runtime;
35
36 import java.io.IOException JavaDoc;
37 import java.io.Writer JavaDoc;
38
39 /**
40  * This class codes around a silly limiation of StringWriter which doesn't allow a StringBuffer
41  * to be passed in as a constructor for some bizzare reason.
42  * So we replicate the behaviour of StringWriter here but allow a StringBuffer to be passed in.
43  *
44  * @author <a HREF="mailto:james@coredevelopers.net">James Strachan</a>
45  * @version $Revision: 1.1 $
46  */
47 public class StringBufferWriter extends Writer JavaDoc {
48
49     private StringBuffer JavaDoc buffer;
50
51     /**
52      * Create a new string writer which will append the text to the given StringBuffer
53      */
54     public StringBufferWriter(StringBuffer JavaDoc buffer) {
55         this.buffer = buffer;
56     }
57
58     /**
59      * Write a single character.
60      */
61     public void write(int c) {
62         buffer.append((char) c);
63     }
64
65     /**
66      * Write a portion of an array of characters.
67      *
68      * @param text Array of characters
69      * @param offset Offset from which to start writing characters
70      * @param length Number of characters to write
71      */
72     public void write(char text[], int offset, int length) {
73         if ((offset < 0) || (offset > text.length) || (length < 0) || ((offset + length) > text.length) || ((offset + length) < 0)) {
74             throw new IndexOutOfBoundsException JavaDoc();
75         }
76         else if (length == 0) {
77             return;
78         }
79         buffer.append(text, offset, length);
80     }
81
82     /**
83      * Write a string.
84      */
85     public void write(String JavaDoc text) {
86         buffer.append(text);
87     }
88
89     /**
90      * Write a portion of a string.
91      *
92      * @param text the text to be written
93      * @param offset offset from which to start writing characters
94      * @param length Number of characters to write
95      */
96     public void write(String JavaDoc text, int offset, int length) {
97         buffer.append(text.substring(offset, offset + length));
98     }
99
100     /**
101      * Return the buffer's current value as a string.
102      */
103     public String JavaDoc toString() {
104         return buffer.toString();
105     }
106
107     /**
108      * Flush the stream.
109      */
110     public void flush() {
111     }
112
113     /**
114      * Closing a <tt>StringWriter</tt> has no effect. The methods in this
115      * class can be called after the stream has been closed without generating
116      * an <tt>IOException</tt>.
117      */
118     public void close() throws IOException JavaDoc {
119     }
120 }
121
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