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Java > Open Source Codes > com > caucho > xsl > java > XslValueOf


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.xsl.java;
30
31 import com.caucho.java.JavaWriter;
32 import com.caucho.xml.QName;
33 import com.caucho.xsl.XslParseException;
34
35 /**
36  * Returns the value of an expression.
37  */
38 public class XslValueOf extends XslNode {
39   private String JavaDoc _select;
40   private String JavaDoc _separator;
41   private String JavaDoc _disableOutputEscaping;
42
43   /**
44    * Returns the tag name.
45    */
46   public String JavaDoc getTagName()
47   {
48     return "xsl:value-of";
49   }
50
51   /**
52    * Adds an attribute.
53    */
54   public void addAttribute(QName name, String JavaDoc value)
55     throws XslParseException
56   {
57     if (name.getName().equals("select"))
58       _select = value;
59     else if (name.getName().equals("disable-output-escaping"))
60       _disableOutputEscaping = value;
61     else if (name.getName().equals("separator"))
62       _separator = value;
63     else
64       super.addAttribute(name, value);
65   }
66
67   /**
68    * Ends the attributes.
69    */
70   public void endAttributes()
71     throws XslParseException
72   {
73     if (_select == null)
74       throw error(L.l("'select' is a required attribute of <xsl:value-of>"));
75   }
76   
77   /**
78    * Adds a child.
79    */
80   public void addChild(XslNode node)
81     throws XslParseException
82   {
83     throw error(L.l("element <{0}> is not allowed in <{1}>.",
84                     node.getTagName(), getTagName()));
85   }
86
87   /**
88    * Generates the code for the tag
89    *
90    * @param out the output writer for the generated java.
91    */
92   public void generate(JavaWriter out)
93     throws Exception JavaDoc
94   {
95     String JavaDoc var = null;
96     
97     if ("yes".equals(_disableOutputEscaping)) {
98       var = "_xsl_out_" + _gen.generateId();
99       out.println("boolean " + var + " = out.disableEscaping(true);");
100     }
101     else if ("no".equals(_disableOutputEscaping)) {
102       var = "_xsl_out_" + _gen.generateId();
103       out.println("boolean " + var + " = out.disableEscaping(false);");
104     }
105     else if (_disableOutputEscaping != null)
106       throw error(L.l("'{0}' is an unknown value for disable-output-escaping. 'yes' and 'no' are the valid values.",
107               _disableOutputEscaping));
108       
109     printStringExpr(out, _select);
110
111     if (var != null)
112       out.println("out.disableEscaping(" + var + ");");
113   }
114 }
115
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