JstlFmtMessage


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.jsp.java;
30  
31  import com.caucho.jsp.JspParseException;
32  import com.caucho.vfs.WriteStream;
33  import com.caucho.xml.QName;
34  
35  import java.io.IOException  ;
36  import java.util.ArrayList  ;
37  
38  public class JstlFmtMessage extends JstlNode {
39    private static final QName KEY = new QName("key");
40    private static final QName BUNDLE = new QName("bundle");
41    private static final QName VAR = new QName("var");
42    private static final QName SCOPE = new QName("scope");
43    
44    private String   _key;
45    private JspAttribute _keyAttr;
46    
47    private String   _bundle;
48    private JspAttribute _bundleAttr;
49    
50    private String   _var;
51    private String   _scope;
52  
53    private ArrayList  <JstlFmtParam> _params = new ArrayList  <JstlFmtParam>();
54    
55    /**
56     * Adds an attribute.
57     */
58    public void addAttribute(QName name, String   value)
59      throws JspParseException
60    {
61      if (KEY.equals(name))
62        _key = value;
63      else if (BUNDLE.equals(name))
64        _bundle = value;
65      else if (VAR.equals(name))
66        _var = value;
67      else if (SCOPE.equals(name))
68        _scope = value;
69      else
70        throw error(L.l("`{0}' is an unknown attribute for <{1}>.",
71                        name.getName(), getTagName()));
72    }
73    
74    /**
75     * Adds an attribute.
76     */
77    public void addAttribute(QName name, JspAttribute value)
78      throws JspParseException
79    {
80      if (KEY.equals(name))
81        _keyAttr = value;
82      else if (BUNDLE.equals(name))
83        _bundleAttr = value;
84      else
85        throw error(L.l("`{0}' is an unsupported jsp:attribute for <{1}>.",
86                        name.getName(), getTagName()));
87    }
88  
89    /**
90     * Adds a child element.
91     */
92    public void addChild(JspNode node)
93      throws JspParseException
94    {
95      if (node instanceof JstlFmtParam)
96        _params.add((JstlFmtParam) node);
97      else
98        super.addChild(node);
99    }
100 
101   /**
102    * Generates the XML text representation for the tag validation.
103    *
104    * @param os write stream to the generated XML.
105    */
106   public void printXml(WriteStream os)
107     throws IOException  
108   {
109     os.print("<fmt:message");
110 
111     if (_key != null) {
112       os.print(" key=\"" + xmlText(_key) + "\"");
113     }
114 
115     if (_bundle != null)
116       os.print(" bundle=\"" + xmlText(_bundle) + "\"");
117     
118     if (_var != null)
119       os.print(" var=\"" + _var + "\"");
120     
121     if (_scope != null)
122       os.print(" scope=\"" + _scope + "\"");
123 
124     os.print(">");
125 
126     for (int i = 0; i < _params.size(); i++)
127       _params.get(i).printXml(os);
128 
129     printXmlChildren(os);
130 
131     os.print("</fmt:message>");
132   }
133 
134   /**
135    * Generates the code for the fmt:message tag.
136    */
137   public void generatePrologue(JspJavaWriter out)
138     throws Exception  
139   {
140     for (int i = 0; i < _params.size(); i++) {
141       _params.get(i).generatePrologue(out);
142     }
143   }
144 
145   /**
146    * Generates the code for the fmt:message tag.
147    */
148   public void generate(JspJavaWriter out)
149     throws Exception  
150   {
151     String   keyExpr = null;
152 
153     if (_key != null) {
154       keyExpr = generateValue(String  .class, _key);
155     }
156     else if (_keyAttr != null) {
157       keyExpr = _keyAttr.generateValue();
158     }
159     else if (isChildrenStatic()) {
160       keyExpr = '"' + escapeJavaString(getStaticText().trim()) + '"';
161     }
162     else {
163       out.println("out = pageContext.pushBody();");
164 
165       generateChildren(out);
166 
167       keyExpr = "_caucho_var_" + _gen.uniqueId();
168 
169       out.println("String " + keyExpr + " = ((com.caucho.jsp.BodyContentImpl) out).getTrimString();");
170 
171       out.println("out = pageContext.popBody();");
172     }
173 
174     // see if there's a fmt:bundle with a prefix
175 
176     String   prefix = "";
177     JspNode node;
178 
179     // jsp/1c51, jsp/1c54
180     /*
181     for (node = getParent(); node != null; node = node.getParent()) {
182       if (node instanceof JstlFmtBundle) {
183         prefix = ((JstlFmtBundle) node).getPrefixCode();
184     break;
185       }
186     }
187     */
188 
189     String   paramVar = "null";
190 
191     if (_params.size() > 0) {
192       paramVar = "_caucho_param_" + _gen.uniqueId();
193 
194       out.println("Object []" + paramVar + " = new Object[" + _params.size() + "];");
195 
196       for (int i = 0; i < _params.size(); i++) {
197         JstlFmtParam param = _params.get(i);
198 
199         param.generateSet(out, paramVar + "[" + i + "]");
200 
201         /*
202         String value = param.getAttribute("value");
203 
204         if (! value.equals("")) {
205           int paramIndex = _gen.addExpr(value);
206 
207           out.println(paramVar + "[" + i + "] = _caucho_expr_" + paramIndex + ".evalObject(pageContext);");
208         }
209         else {
210           out.println("out = pageContext.pushBody();");
211 
212           _gen.generateChildren(param.getFirstChild());
213 
214           out.println(paramVar + "[" + i + "] = ((com.caucho.jsp.BodyContentImpl) out).getTrimString();");
215 
216           out.println("out = pageContext.popBody();");
217         }
218         */
219       }
220     }
221 
222     if (_var != null) {
223       String   value;
224 
225       if (_bundleAttr != null) {
226         value = ("pageContext.getLocalizedMessage(" +
227          _bundleAttr.generateValue() + ", " +
228                  prefix + keyExpr + ", " + paramVar + ", null)");
229       }
230       else if (_bundle != null) {
231         String   bundleExpr = generateValue(Object  .class, _bundle);
232       
233         value = ("pageContext.getLocalizedMessage(" + bundleExpr + ", " +
234                  prefix + keyExpr + ", " + paramVar + ", null)");
235       }
236       else
237         value = ("pageContext.getLocalizedMessage(null, " + prefix + keyExpr + ", " +
238                  paramVar + ", null)");
239   
240       generateSetOrRemove(out, _var, _scope, value);
241     }
242     else {
243       if (_bundleAttr != null) {
244         String   bundleExpr = _bundleAttr.generateValue();
245       
246         out.println("out.print(pageContext.getLocalizedMessage(" + bundleExpr + ", " + prefix + keyExpr + ", " + paramVar + ", null));");
247 
248       }
249       else if (_bundle != null) {
250         String   bundleExpr = generateValue(Object  .class, _bundle);
251       
252         out.println("out.print(pageContext.getLocalizedMessage(" + bundleExpr + ", " + prefix + keyExpr + ", " + paramVar + ", null));");
253 
254       }
255       else
256         out.println("out.print(pageContext.getLocalizedMessage(null, " + prefix + keyExpr + ", " + paramVar + ", null));");
257     }
258   }
259 }
260
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