textareatag.java

strust 框架 的源程序以及java类源代码

/*
 * $Id: TextareaTag.java 164530 2005-04-25 03:11:07Z niallp $ 
 *
 * Copyright 1999-2005 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.struts.taglib.html;

import javax.servlet.jsp.JspException;

import org.apache.struts.taglib.TagUtils;

/**
 * Custom tag for input fields of type "textarea".
 *
 * @version $Rev: 164530 $ $Date: 2005-04-25 04:11:07 +0100 (Mon, 25 Apr 2005) $
 */
public class TextareaTag extends BaseInputTag {


    // ----------------------------------------------------- Constructor

    public TextareaTag () {
        super();
        doReadonly = true;
    }

    // --------------------------------------------------------- Public Methods


    /**
     * Generate the required input tag.
     * Support for indexed since Struts 1.1
     *
     * @exception JspException if a JSP exception has occurred
     */
    public int doStartTag() throws JspException {
        
        TagUtils.getInstance().write(pageContext, this.renderTextareaElement());

        return (EVAL_BODY_TAG);
    }

    /**
     * Generate an HTML <textarea> tag.
     * @throws JspException
     * @since Struts 1.1
     */
    protected String renderTextareaElement() throws JspException {
        StringBuffer results = new StringBuffer("<textarea");
        
        prepareAttribute(results, "name", prepareName());
        prepareAttribute(results, "accesskey", getAccesskey());
        prepareAttribute(results, "tabindex", getTabindex());
        prepareAttribute(results, "cols", getCols());
        prepareAttribute(results, "rows", getRows());
        results.append(prepareEventHandlers());
        results.append(prepareStyles());
        prepareOtherAttributes(results);
        results.append(">");
        
        results.append(this.renderData());
        
        results.append("</textarea>");
        return results.toString();
    }

    /**
     * Renders the value displayed in the &lt;textarea&gt; tag.
     * @throws JspException
     * @since Struts 1.1
     */
    protected String renderData() throws JspException {
        String data = this.value;

        if (data == null) {
            data = this.lookupProperty(this.name, this.property);
        }
        
        return (data == null) ? "" : TagUtils.getInstance().filter(data);
    }

    /**
     * Release any acquired resources.
     */
    public void release() {

        super.release();
        name = Constants.BEAN_KEY;

    }

}