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Jetty example source code file (BodyTagSupport.java)

This example Jetty source code file (BodyTagSupport.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Jetty tags/keywords

bodycontent, bodycontent, bodytag, bodytagsupport, bodytagsupport, eval_body_buffered, http, jspexception, jspexception, jspwriter, jspwriter, servlet, skip_body, tagsupport

The Jetty BodyTagSupport.java source code

/**
 *
 * Copyright 2003-2004 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.
 */

//
// This source code implements specifications defined by the Java
// Community Process. In order to remain compliant with the specification
// DO NOT add / change / or delete method signatures!
//

package javax.servlet.jsp.tagext;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;

/**
 * A base class for defining tag handlers implementing BodyTag.
 *
 * <p>
 * The BodyTagSupport class implements the BodyTag interface and adds
 * additional convenience methods including getter methods for the
 * bodyContent property and methods to get at the previous out JspWriter.
 *
 * <p>
 * Many tag handlers will extend BodyTagSupport and only redefine a
 * few methods.
 */

public class BodyTagSupport extends TagSupport implements BodyTag {

    /**
     * Default constructor, all subclasses are required to only define
     * a public constructor with the same signature, and to call the
     * superclass constructor.
     *
     * This constructor is called by the code generated by the JSP
     * translator.
     */

    public BodyTagSupport() {
	super();
    }

    /**
     * Default processing of the start tag returning EVAL_BODY_BUFFERED.
     *
     * @return EVAL_BODY_BUFFERED
     * @throws JspException if an error occurred while processing this tag
     * @see BodyTag#doStartTag
     */
 
    public int doStartTag() throws JspException {
        return EVAL_BODY_BUFFERED;
    }


    /**
     * Default processing of the end tag returning EVAL_PAGE.
     *
     * @return EVAL_PAGE
     * @throws JspException if an error occurred while processing this tag
     * @see Tag#doEndTag
     */

    public int doEndTag() throws JspException {
	return super.doEndTag();
    }


    // Actions related to body evaluation

    /**
     * Prepare for evaluation of the body: stash the bodyContent away.
     *
     * @param b the BodyContent
     * @see #doAfterBody
     * @see #doInitBody()
     * @see BodyTag#setBodyContent
     */

    public void setBodyContent(BodyContent b) {
	this.bodyContent = b;
    }


    /**
     * Prepare for evaluation of the body just before the first body evaluation:
     * no action.
     *
     * @throws JspException if an error occurred while processing this tag
     * @see #setBodyContent
     * @see #doAfterBody
     * @see BodyTag#doInitBody
     */

    public void doInitBody() throws JspException {
    }


    /**
     * After the body evaluation: do not reevaluate and continue with the page.
     * By default nothing is done with the bodyContent data (if any).
     *
     * @return SKIP_BODY
     * @throws JspException if an error occurred while processing this tag
     * @see #doInitBody
     * @see BodyTag#doAfterBody
     */

    public int doAfterBody() throws JspException {
 	return SKIP_BODY;
    }


    /**
     * Release state.
     *
     * @see Tag#release
     */

    public void release() {
	bodyContent = null;

	super.release();
    }

    /**
     * Get current bodyContent.
     *
     * @return the body _content.
     */
    
    public BodyContent getBodyContent() {
	return bodyContent;
    }


    /**
     * Get surrounding out JspWriter.
     *
     * @return the enclosing JspWriter, from the bodyContent.
     */

    public JspWriter getPreviousOut() {
	return bodyContent.getEnclosingWriter();
    }

    // protected fields

    /**
     * The current BodyContent for this BodyTag.
     */
    protected BodyContent   bodyContent;
}

Other Jetty examples (source code examples)

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