dynapropertiestag.java

Junit in Action的随书原代码

/*
 * =================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001-2003 The Apache Software Foundation.  All 
 * rights reserved.
 *
 * Redistribution and use in source and binary forms, with or 
 * without modification, are permitted provided that the following 
 * conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above 
 *    copyright notice, this list of conditions and the following 
 *    disclaimer in the documentation and/or other materials 
 *    provided with the distribution.
 *
 * 3. The end-user documentation included with the redistribution, 
 *    if any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software 
 *    itself, if and wherever such third-party acknowlegements 
 *    normally appear.
 *
 * 4. The names "The Jakarta Project", "junitbook", "jia", 
 *    "JUnit in Action" and "Apache Software Foundation" must not be 
 *    used to endorse or promote products derived from this software 
 *    without prior written permission. For written permission, 
 *    please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 * =================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For 
 * more information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */
package junitbook.pages;

import org.apache.commons.beanutils.DynaBean;
import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;

import javax.servlet.jsp.tagext.TagSupport;
import javax.servlet.jsp.JspException;

public class DynaPropertiesTag extends TagSupport
{
    private String varName;
    private String item;

    public void setVar(String varName)
    {
        this.varName = varName;
    }

    public String getVar()
    {
        return this.varName;
    }

    public void setItem(String item)
    {
        this.item = item;
    }

    public String getItem()
    {
        return this.item;
    }

    public int doStartTag() throws JspException
    {
        // Evaluate the item attribute (an EL expression) which 
        // must result in a DynaBean object.
        DynaBean bean = 
            (DynaBean) ExpressionEvaluatorManager.evaluate(
            "item", getItem(), DynaBean.class, this, 
            this.pageContext);

        // Get the DynaBean meta-properties and store them in the 
        // variable pointed to by the "var" attribute.
        this.pageContext.setAttribute(getVar(),
            bean.getDynaClass().getDynaProperties());
        return SKIP_BODY;
    }

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