/*
 * Copyright (c) 1998-2008 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 Software Foundation, 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.vfs.WriteStream;
import com.caucho.xml.QName;

import java.io.IOException;

/**
 * Generates code for the fmt:setBundle tag.
 *
 * <p>Set bundle looks up the correct localization context based on
 * a <code>basename</code> and the current <code>pageContext</code>.
 */
public class JstlFmtSetBundle extends JstlNode {
  private static final QName BASENAME = new QName("basename");
  private static final QName VAR = new QName("var");
  private static final QName SCOPE = new QName("scope");
  
  private String _basename;
  private JspAttribute _basenameAttr;
  
  private String _var = "javax.servlet.jsp.jstl.fmt.localizationContext";
  private String _scope;
  
  /**
   * Adds an attribute.
   */
  public void addAttribute(QName name, String value)
    throws JspParseException
  {
    if (BASENAME.equals(name))
      _basename = value;
    else if (VAR.equals(name))
      _var = value;
    else if (SCOPE.equals(name))
      _scope = value;
    else
      throw error(L.l("'{0}' is an unknown attribute for <{1}>.",
                      name.getName(), getTagName()));
  }
  
  /**
   * Adds an attribute.
   */
  public void addAttribute(QName name, JspAttribute value)
    throws JspParseException
  {
    if (BASENAME.equals(name))
      _basenameAttr = value;
    else
      throw error(L.l("'{0}' is an unsupported jsp:attribute for <{1}>.",
                      name.getName(), getTagName()));
  }

  /**
   * 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("<fmt:bundle");

    if (_basename != null)
      os.print(" basename=\"" + xmlText(_basename) + "\"");
    
    if (_var != null)
      os.print(" var=\"" + xmlText(_var) + "\"");
    
    if (_scope != null)
      os.print(" scope=\"" + xmlText(_scope) + "\"");

    os.print(">");

    printXmlChildren(os);

    os.print("</fmt:bundle>");
  }

  /**
   * Generates the code for the c:out tag.
   */
  public void generate(JspJavaWriter out)
    throws Exception
  {
    if (_basename == null && _basenameAttr == null)
      throw error(L.l("required attribute 'basename' missing from '{0}'",
                      getTagName()));

    String basenameExpr;

    if (_basenameAttr != null)
      basenameExpr = _basenameAttr.generateValue();
    else
      basenameExpr = generateValue(String.class, _basename);

    String value = "pageContext.getBundle(" + basenameExpr + ")";

    generateSetNotNull(out, _var, _scope, value);
  }
}
