coreparamtag.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 123 行

/*
 * 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 SoftwareFoundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.jstl.rt;

import com.caucho.jstl.NameValueTag;
import com.caucho.util.L10N;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.BodyTagSupport;
import javax.servlet.jsp.tagext.Tag;

/**
 * Looks up an i18n message from a bundle and prints it.
 */
public class CoreParamTag extends BodyTagSupport {
  private static L10N L = new L10N(CoreParamTag.class);
  
  private String _name;
  private String _value;

  /**
   * Sets the name
   *
   * @param name the JSP-EL expression for the name.
   */
  public void setName(String name)
  {
    _name = name;
  }

  /**
   * Sets the value
   *
   * @param value the JSP-EL expression for the value.
   */
  public void setValue(String value)
  {
    _value = value;
  }

  /**
   * Process the tag.
   */
  public int doStartTag()
    throws JspException
  {
    if (_name == null)
      return SKIP_BODY;
    
    if (_value == null)
      return EVAL_BODY_BUFFERED;
    
    Tag parent = getParent();
    for (; parent != null; parent = parent.getParent()) {
      if (parent instanceof NameValueTag) {
	NameValueTag tag = (NameValueTag) parent;

	if (_value == null)
	  tag.addParam(_name, "");
	else
	  tag.addParam(_name, _value);
	
	return SKIP_BODY;
      }
    }
      
    throw new JspException(L.l("c:param requires c:url or c:import parent.")); 
  }

  /**
   * Process the tag.
   */
  public int doEndTag()
    throws JspException
  {
    if (_value != null)
      return EVAL_PAGE;
      
    String value;

    if (bodyContent != null)
      value = bodyContent.getString().trim();
    else
      value = "";
    
    Object parent = getParent();
    if (! (parent instanceof NameValueTag))
      throw new JspException(L.l("c:param requires c:url or c:import parent.")); 

    NameValueTag tag = (NameValueTag) parent;

    tag.addParam(_name, value);
    
    return EVAL_PAGE;
  }
}