001: /*
002: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003: *
004: * This file is part of Resin(R) Open Source
005: *
006: * Each copy or derived work must preserve the copyright notice and this
007: * notice unmodified.
008: *
009: * Resin Open Source is free software; you can redistribute it and/or modify
010: * it under the terms of the GNU General Public License as published by
011: * the Free Software Foundation; either version 2 of the License, or
012: * (at your option) any later version.
013: *
014: * Resin Open Source is distributed in the hope that it will be useful,
015: * but WITHOUT ANY WARRANTY; without even the implied warranty of
016: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017: * of NON-INFRINGEMENT. See the GNU General Public License for more
018: * details.
019: *
020: * You should have received a copy of the GNU General Public License
021: * along with Resin Open Source; if not, write to the
022: * Free SoftwareFoundation, Inc.
023: * 59 Temple Place, Suite 330
024: * Boston, MA 02111-1307 USA
025: *
026: * @author Scott Ferguson
027: */
028:
029: package com.caucho.jsp.java;
030:
031: import com.caucho.jsp.JspParseException;
032: import com.caucho.vfs.WriteStream;
033: import com.caucho.xml.QName;
034:
035: import java.io.IOException;
036:
037: /**
038: * Special generator for a JSTL c:when tag.
039: */
040: public class JstlCoreRtWhen extends JstlNode {
041: private static final QName TEST = new QName("test");
042: private Object _test;
043:
044: /**
045: * Adds an attribute.
046: */
047: public void addAttribute(QName name, String value)
048: throws JspParseException {
049: if (TEST.equals(name))
050: _test = value;
051: else
052: throw error(L.l("`{0}' is an unknown attribute for <{1}>.",
053: name.getName(), getTagName()));
054: }
055:
056: /**
057: * Adds a fragment attribute.
058: */
059: public void addAttribute(String name, JspAttribute value)
060: throws JspParseException {
061: if (name.equals("test"))
062: _test = value;
063: else
064: throw error(L.l(
065: "`{0}' can is an illegal jsp:attribute for <{1}>.",
066: name, getTagName()));
067: }
068:
069: /**
070: * Generates the XML text representation for the tag validation.
071: *
072: * @param os write stream to the generated XML.
073: */
074: public void printXml(WriteStream os) throws IOException {
075: os.print("<c-rt:when");
076:
077: if (_test instanceof String) {
078: os.print(" test=\"");
079: printXmlText(os, (String) _test);
080: os.print("\">");
081: } else {
082: os.print(">");
083: }
084:
085: printXmlChildren(os);
086:
087: os.print("</c-rt:when>");
088: }
089:
090: /**
091: * Generates the code for the c:if tag.
092: */
093: public void generate(JspJavaWriter out) throws Exception {
094: if (_test == null)
095: throw error(L.l(
096: "required attribute `test' missing from <{0}>",
097: getTagName()));
098:
099: String ifExpr = generateRTValue(boolean.class, _test);
100:
101: out.println("if (" + ifExpr + ") {");
102: out.pushDepth();
103: generateChildren(out);
104:
105: out.popDepth();
106: out.println("}");
107: }
108: }
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