codectag.java

来自「jGossip是一个简单而功能强大的Java论坛软件（消息板）」· Java 代码 · 共 110 行

/*
 * $$Id: CodecTag.java,v 1.4 2004/05/24 04:50:21 alexnet Exp $$
 *
 * ***** BEGIN LICENSE BLOCK *****
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License
 * at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and
 * limitations under the License.
 *
 * The Original Code is JGossip forum code.
 *
 * The Initial Developer of the Original Code is the JResearch, Org.
 * Portions created by the Initial Developer are Copyright (C) 2004
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *              Dmitry Belov <[e-mail]>
 *
 * ***** END LICENSE BLOCK ***** */
/*
 * Created on Dec 9, 2003
 *
 */
package org.jresearch.gossip.tags;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.tagext.BodyTagSupport;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
import org.jresearch.gossip.util.HtmlCodec;


/**
 * DOCUMENT ME!
 *
 * @author Bel
 */
public class CodecTag extends BodyTagSupport {

	/**
	 * Logger instance.
	 */
	private static final Log LOG = LogFactory.getLog(CodecTag.class);

    private String value = "";

    /**
     * DOCUMENT ME!
     *
     * @param value DOCUMENT ME!
     */
    public void setValue(String value) {
        this.value = value;
    }

    private void eval() throws JspException {
            value = (String) ExpressionEvaluatorManager.evaluate("value",
                    value, String.class, this, pageContext);
    }

  

  public int doStartTag() throws JspException {
		  try {
				  if (value != null) {
				  	      eval();
						  JspWriter out = pageContext.getOut();
						  out.print(HtmlCodec.encode(value.trim()));
				  }
		  } catch (IOException ex) {
			if(LOG.isErrorEnabled())
			{
				LOG.error("CodecTag::", ex);
			}
		  	throw new JspException("error in CodecTag tag:" + ex.getMessage());
		  }
		  return (EVAL_BODY_BUFFERED);
  }
  public int doAfterBody() throws JspException {
		  try {
				  BodyContent body = getBodyContent();
				  if (body != null) {
						  JspWriter out = body.getEnclosingWriter();
						  String encodedBody = HtmlCodec.encode(body.getString());
						  out.print(
								  encodedBody.equalsIgnoreCase("null") ? "" : encodedBody);
				  }

		  } catch (IOException ex) {
				if(LOG.isErrorEnabled())
				{
					LOG.error("CodecTag::", ex);
				}
				throw new JspException("error in CodecTag tag:" + ex.getMessage());
		  }
		  return (SKIP_BODY);
  }
}