exclude.java

来自「jakarta-taglibs」· Java 代码 · 共 56 行

/*
 * Copyright 1999,2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ 
package org.apache.taglibs.benchmark;

import java.util.*;
import javax.servlet.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

/**
 *
 *  A tag handler for the <benchmark:exclude> tag, which excludes
 *  the time it takes to process its body from its nearest
 *  <benchmark:duration> ancestor's timer.
 *
 *  @version 0.90
 *  @author Shawn Bayern
 */

public class Exclude extends TagSupport {

    private Duration p;				// parent Duration tag handler

    public void release() {
	p = null;
    }

    public int doStartTag() throws JspException {
	p = (Duration) findAncestorWithClass(this, Duration.class);
	if (p == null)
	    throw new JspTagException(
		"<exclude> must be enclosed within "
		+ "<duration>");
	p.pauseTimer();
	return EVAL_BODY_INCLUDE;
    }

    public int doEndTag() throws JspException {
	p.restartTimer();
	return EVAL_PAGE;
    }
}