/*
* Copyright (c) 1998-2010 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.jsp.java;
import com.caucho.jsp.JspParseException;
import com.caucho.jsp.cfg.TldVariable;
import com.caucho.vfs.WriteStream;
import com.caucho.xml.QName;
import java.io.IOException;
import java.util.ArrayList;
/**
* jsp:invoke invokes a fragment
*/
public class JspInvoke extends JspNode {
private static final QName FRAGMENT = new QName("fragment");
private static final QName VAR = new QName("var");
private static final QName SCOPE = new QName("scope");
private static final QName VAR_READER = new QName("varReader");
private String _name;
private String _var;
private String _varReader;
private String _scope;
/**
* Adds an attribute.
*/
public void addAttribute(QName name, String value)
throws JspParseException
{
if (FRAGMENT.equals(name))
_name = value;
else if (VAR.equals(name))
_var = value;
else if (VAR_READER.equals(name))
_varReader = value;
else if (SCOPE.equals(name))
_scope = value;
else
throw error(L.l("`{0}' is an unknown attribute for jsp:invoke.",
name.getName()));
}
/**
* Called when the attributes end.
*/
public void endAttributes()
throws JspParseException
{
if (! _gen.getParseState().isTag())
throw error(L.l("`{0}' is only allowed in .tag files. Attribute directives are not allowed in normal JSP files.",
getTagName()));
}
/**
* Called when the body ends.
*/
public void endElement()
throws JspParseException
{
if (_name == null)
throw error(L.l("'fragment' is a required attribute of <jsp:invoke>."));
if (_scope != null && _var == null && _varReader == null)
throw error(L.l("'scope' requires a 'var' or a 'varReader' attribute for <jsp:invoke>."));
if (_var != null && _varReader != null)
throw error(L.l("jsp:invoke may not have both 'var' and 'varReader'"));
}
/**
* Generates the XML text representation for the tag validation.
*
* @param os write stream to the generated XML.
*/
public void printXml(WriteStream os)
throws IOException
{
os.print("<jsp:invoke");
if (_name != null)
os.print(" name=\"" + _name + "\"");
if (_var != null)
os.print(" var=\"" + _var + "\"");
if (_varReader != null)
os.print(" varReader=\"" + _varReader + "\"");
if (_scope != null)
os.print(" scope=\"" + _scope + "\"");
os.print("/>");
}
/**
* Generates the children.
*/
public void generate(JspJavaWriter out)
throws Exception
{
String name = "_jsp_frag_" + _gen.uniqueId();
out.println("javax.servlet.jsp.tagext.JspFragment " + name + " = (javax.servlet.jsp.tagext.JspFragment) pageContext.getAttribute(\"" + _name + "\");");
out.println("if (" + name + " != null) {");
out.pushDepth();
JavaTagGenerator gen = (JavaTagGenerator) _gen;
ArrayList<TldVariable> vars = gen.getVariables();
for (int i = 0; i < vars.size(); i++) {
TldVariable var = vars.get(i);
if (var.getScope().equals("AT_END"))
continue;
String srcName = var.getNameGiven();
String dstName = srcName;
if (srcName == null) {
srcName = var.getAlias();
dstName = var.getNameFromAttribute();
dstName = "_jsp_var_from_attribute_" + i;
}
else
dstName = "\"" + dstName + "\"";
out.print("_jsp_parentContext.setAttribute(" + dstName + ", ");
out.println("pageContext.getAttribute(\"" + srcName + "\"));");
}
/*
if (vars.size() > 0) {
out.println("try {");
out.pushDepth();
}
*/
String context = null;
if (_scope == null || _scope.equals("page"))
context = "pageContext";
else if (_scope.equals("request"))
context = "pageContext.getRequest()";
else if (_scope.equals("session"))
context = "pageContext.getSessionScope()";
else if (_scope.equals("application"))
context = "pageContext.getApplication()";
else
throw error(L.l("Unknown scope `{0}' in <jsp:invoke>. Scope must be `page', `request', `session', or `application'.", _scope));
if (_var != null) {
out.print(context + ".setAttribute(\"" + _var + "\", ");
out.println("pageContext.invoke(" + name + "));");
}
else if (_varReader != null) {
out.print(context + ".setAttribute(\"" + _varReader + "\", ");
out.println("pageContext.invokeReader(" + name + "));");
}
else {
out.println(name + ".invoke(null);");
}
out.popDepth();
out.println("}");
}
}