basefieldtag.java

这是一个轻便的j2ee的web应用框架,是一个在多个项目中运用的实际框架,采用struts,hebinate,xml等技术,有丰富的tag,role,navigation,session,dictio

/*
 * $Header: /sfroot/cvs/esimple/src/core/com/esimple/framework/web/taglib/html/BaseFieldTag.java,v 1.1.1.1 2004/09/08 06:38:15 lava Exp $
 * $Revision: 1.1.1.1 $
 * $Date: 2004/09/08 06:38:15 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999-2001 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", "Struts", 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"
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 * 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
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * 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.
 * ====================================================================
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 * 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 com.esimple.framework.web.taglib.html;

import javax.servlet.jsp.JspException;
import org.apache.struts.util.RequestUtils;
import org.apache.struts.util.ResponseUtils;

/**
 * Convenience base class for the various input tags for text fields.
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.1.1.1 $ $Date: 2004/09/08 06:38:15 $
 */

public abstract class BaseFieldTag extends BaseInputTag {

    // ----------------------------------------------------- Instance Variables

    /**
     * Comma-delimited list of content types that a server processing this form
     * will handle correctly.  This property is defined only for the
     * <code>file</code> tag, but is implemented here because it affects the
     * rendered HTML of the corresponding &lt;input&gt; tag.
     */
    protected String accept = null;

    public String getAccept() {
        return (this.accept);
    }

    public void setAccept(String accept) {
        this.accept = accept;
    }

    /**
     * The name of the bean containing our underlying property.
     */
    protected String name = Constants.BEAN_KEY;

    public String getName() {
        return (this.name);
    }

    public void setName(String name) {
        this.name = name;
    }

    /**
     * The "redisplay contents" flag (used only on <code>password</code>).
     */
    protected boolean redisplay = true;

    public boolean getRedisplay() {
        return (this.redisplay);
    }

    public void setRedisplay(boolean redisplay) {
        this.redisplay = redisplay;
    }

    /**
     * The type of input field represented by this tag (text, password, or
     * hidden).
     */
    protected String type = null;

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

    /**
     * Generate the required input tag.
     * <p>
     * Support for indexed property since Struts 1.1
     *
     * @exception JspException if a JSP exception has occurred
     */
    public int doStartTag() throws JspException {

        // Create an appropriate "input" element based on our parameters
        StringBuffer results = new StringBuffer("<input type=\"");
        results.append(type);
        results.append("\" name=\"");
        // * @since Struts 1.1
        if (indexed)
            prepareIndex(results, name);
        results.append(property);
        results.append("\"");
        if (accesskey != null) {
            results.append(" accesskey=\"");
            results.append(accesskey);
            results.append("\"");
        }
        if (accept != null) {
            results.append(" accept=\"");
            results.append(accept);
            results.append("\"");
        }
        if (maxlength != null) {
            results.append(" maxlength=\"");
            results.append(maxlength);
            results.append("\"");
        }
        if (cols != null) {
            results.append(" size=\"");
            results.append(cols);
            results.append("\"");
        }
        if (tabindex != null) {
            results.append(" tabindex=\"");
            results.append(tabindex);
            results.append("\"");
        }
        results.append(" value=\"");
        if (value != null) {
            results.append(ResponseUtils.filter(value));
        } else if (redisplay || !"password".equals(type)) {
            Object value = RequestUtils.lookup(pageContext, name, property, null);
            if (value == null)
                value = "";
            results.append(ResponseUtils.filter(value.toString()));
        }
        results.append("\"");
        results.append(prepareEventHandlers());
        results.append(prepareStyles());
        results.append(getElementClose());

        // Print this field to our output writer
        ResponseUtils.write(pageContext, results.toString());

        // Continue processing this page
        return (EVAL_BODY_TAG);

    }

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

        super.release();
        accept = null;
        name = Constants.BEAN_KEY;
        redisplay = true;

    }

}