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 x:when tag.
039: */
040: public class JstlXmlWhen extends JstlNode {
041: private static final QName SELECT = new QName("select");
042:
043: private String _select;
044:
045: /**
046: * Adds an attribute.
047: */
048: public void addAttribute(QName name, String value)
049: throws JspParseException {
050: if (SELECT.equals(name))
051: _select = value;
052: else
053: throw error(L.l("`{0}' is an unknown attribute for <{1}>.",
054: name.getName(), getTagName()));
055: }
056:
057: /**
058: * Adds an attribute.
059: */
060: public void addAttribute(QName name, JspAttribute value)
061: throws JspParseException {
062: if (false)
063: throw error(L.l(
064: "`{0}' is an unknown jsp:attribute for <{1}>.",
065: name.getName(), getTagName()));
066: }
067:
068: /**
069: * Called after all the attributes from the tag.
070: */
071: @Override
072: public void endAttributes() throws JspParseException {
073: if (!(getParent() instanceof JstlCoreChoose)) {
074: throw error(L
075: .l("x:when must be contained in a x:choose tag."));
076: }
077: }
078:
079: /**
080: * Generates the XML text representation for the tag validation.
081: *
082: * @param os write stream to the generated XML.
083: */
084: public void printXml(WriteStream os) throws IOException {
085: os.print("<x:when select=\"");
086: printXmlText(os, _select);
087: os.print("\">");
088:
089: printXmlChildren(os);
090:
091: os.print("</x:when>");
092: }
093:
094: /**
095: * Generates the code for the x:when tag.
096: */
097: public void generate(JspJavaWriter out) throws Exception {
098: if (_select == null)
099: throw error(L.l(
100: "required attribute `select' missing from <{0}>",
101: getTagName()));
102:
103: String ifExpr = ("com.caucho.jstl.el.XmlIfTag.evalBoolean(pageContext, "
104: + _gen.addXPathExpr(_select, getNamespaceContext()) + ")");
105:
106: out.println("if (" + ifExpr + ") {");
107: out.pushDepth();
108:
109: generateChildren(out);
110:
111: out.popDepth();
112: out.println("}");
113: }
114: }
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