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Java > Open Source Codes > org > apache > tapestry > parse > TextToken


1 // Copyright 2004, 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.parse;
16
17 import org.apache.hivemind.ApplicationRuntimeException;
18 import org.apache.hivemind.Location;
19 import org.apache.hivemind.util.ToStringBuilder;
20 import org.apache.tapestry.IMarkupWriter;
21 import org.apache.tapestry.IRender;
22 import org.apache.tapestry.IRequestCycle;
23
24 /**
25  * Represents static text in the template that may be passed through to the client unchanged
26  * (except, perhaps, for the removal of some whitespace).
27  *
28  * @see TokenType#TEXT
29  * @author Howard Lewis Ship
30  * @since 3.0
31  */
32
33 public class TextToken extends TemplateToken implements IRender
34 {
35     private char[] _templateData;
36
37     private int _offset;
38
39     private int _length;
40
41     public TextToken(char[] templateData, int startIndex, int endIndex, Location location)
42     {
43         super(TokenType.TEXT, location);
44
45         if (startIndex < 0 || endIndex < 0 || startIndex > templateData.length
46                 || endIndex > templateData.length)
47             throw new ApplicationRuntimeException(ParseMessages.rangeError(
48                     this,
49                     templateData.length), this, getLocation(), null);
50
51         _templateData = templateData;
52
53         _offset = startIndex;
54         _length = endIndex - startIndex + 1;
55     }
56
57     public void render(IMarkupWriter writer, IRequestCycle cycle)
58     {
59         if (_length == 0)
60             return;
61
62         // At one time, we would check to see if the cycle was rewinding and
63 // only invoke printRaw() if it was. However, that slows down
64 // normal rendering (microscopically) and, with the new
65 // NullResponseWriter class, the "cost" of invoking cycle.isRewinding()
66 // is approximately the same as the "cost" of invoking writer.printRaw().
67
68         writer.printRaw(_templateData, _offset, _length);
69     }
70
71     protected void extendDescription(ToStringBuilder builder)
72     {
73         builder.append("offset", _offset);
74         builder.append("length", _length);
75     }
76
77     public String JavaDoc getTemplateDataAsString()
78     {
79         return new String JavaDoc(_templateData, _offset, _length);
80     }
81
82     public int getLength()
83     {
84         return _length;
85     }
86
87     public int getOffset()
88     {
89         return _offset;
90     }
91 }
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