textarea.java

来自「jakarta-taglibs」· Java 代码 · 共 147 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.input;

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

/**
 *
 *  This class implements the <input:textarea> tag, which presents a
 *  <textarea> form element.
 *
 *  @version 0.90
 *  @author Shawn Bayern
 *  @author Lance Lavandowska
 *  @author Karl von Randow
 */

public class TextArea extends TagSupport {

    private String name;        // name of the textarea
    private String dVal;        // default value if none is found
    private Map attributes;     // attributes of the <textarea> element
    private String attributesText; // attributes of the <input> element as text
    private String beanId;      // bean id to get default values from

    public int doStartTag() throws JspException {
        try {
            // sanity check
            if (name == null || name.equals(""))
                throw new JspTagException("invalid null or empty 'name'");

            // Store beanId in a local variable as we change it
            String beanId = this.beanId;

            // Get default beanId
            if ( beanId == null ) {
                beanId = Util.defaultFormBeanId( this );
            }
            else if ( beanId.length() == 0 ) {
                // An empty beanId means, do not use any bean - not even default
                beanId = null;
            }

            // get what we need from the page
            ServletRequest req = pageContext.getRequest();
            JspWriter out = pageContext.getOut();

            // start building up the tag
            out.print("<textarea name=\"" + Util.quote(name) + "\" ");

            // include any attributes we've got here
            Util.printAttributes(out, attributes);
            if ( attributesText != null ) {
                out.print( attributesText + " " );
            }

            // end the starting tag
            out.print(">");

            /*
             * print out the value from the bean if it's there, or from the
             * request if it's there, or use the default value if it's not
             */
            String beanValue = ( beanId != null ? Util.beanPropertyValue(
                pageContext.findAttribute( beanId ), name ) : null );
            if ( beanValue != null ) {
                out.print( Util.quote(beanValue) );
            }
            else if (req.getParameter(name) != null) {
                out.print(Util.quote(req.getParameter(name)));
            }
            else {
                if (dVal != null)
                    out.print(Util.quote(dVal));
            }
            
            // end the textarea
            out.print("</textarea>");

        } catch (Exception ex) {
            throw new JspTagException(ex.getMessage());
        }
        return SKIP_BODY;
    }

    public void setName(String x) {
        name = x;
    }

    public void setAttributes(Map x) {
        attributes = x;
    }
    
    public void setAttributesText( String x ) {
        attributesText = x;
    }
    
    public void setBean( String x ) {
        beanId = x;
    }

    public void setDefault(String x) {
        dVal = x;
    }
    
    /** Getter for property name.
     * @return Value of property name.
     */
    public String getName() { return name; }
    
    /** Getter for property default.
     * @return Value of property default.
     */
    public String getDefault() { return dVal; }
    
    /** Getter for property bean.
     * @return Value of property bean.
     */
    public String getBean() { return beanId; }
    
    /** Getter for property attributesText.
     * @return Value of property attributesText.
     */
    public String getAttributesText() { return attributesText; }
    
    /** Getter for property attributes.
     * @return Value of property attributes.
     */
    public Map getAttributes() { return attributes; }
}