eloptiontag.java

jakarta-struts-1.2.4-src

/*
 * $Header: /home/cvs/jakarta-struts/contrib/struts-el/src/share/org/apache/strutsel/taglib/html/ELOptionTag.java,v 1.9 2004/03/14 07:15:01 sraeburn Exp $
 * $Revision: 1.9 $
 * $Date: 2004/03/14 07:15:01 $
 *
 * 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.strutsel.taglib.html;

import org.apache.struts.taglib.html.OptionTag;
import javax.servlet.jsp.JspException;
import org.apache.strutsel.taglib.utils.EvalHelper;

/**
 * Tag for select options.  The body of this tag is presented to the user
 * in the option list, while the value attribute is the value returned to
 * the server if this option is selected.
 *<p>
 * This class is a subclass of the class
 * <code>org.apache.struts.taglib.html.OptionTag</code> which provides most of
 * the described functionality.  This subclass allows all attribute values to
 * be specified as expressions utilizing the JavaServer Pages Standard Library
 * expression language.
 *
 * @version $Revision: 1.9 $
 */
public class ELOptionTag extends OptionTag {

    /**
     * Instance variable mapped to "bundle" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String bundleExpr;
    /**
     * Instance variable mapped to "disabled" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String disabledExpr;
    /**
     * Instance variable mapped to "key" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String keyExpr;
    /**
     * Instance variable mapped to "locale" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String localeExpr;
    /**
     * Instance variable mapped to "style" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String styleExpr;
    /**
     * Instance variable mapped to "styleClass" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String styleClassExpr;
    /**
     * Instance variable mapped to "styleId" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String styleIdExpr;
    /**
     * Instance variable mapped to "value" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String valueExpr;

    /**
     * Getter method for "bundle" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getBundleExpr() { return (bundleExpr); }
    /**
     * Getter method for "disabled" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getDisabledExpr() { return (disabledExpr); }
    /**
     * Getter method for "key" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getKeyExpr() { return (keyExpr); }
    /**
     * Getter method for "locale" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getLocaleExpr() { return (localeExpr); }
    /**
     * Getter method for "style" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getStyleExpr() { return (styleExpr); }
    /**
     * Getter method for "styleClass" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getStyleClassExpr() { return (styleClassExpr); }
    /**
     * Getter method for "styleId" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getStyleIdExpr() { return (styleIdExpr); }
    /**
     * Getter method for "value" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getValueExpr() { return (valueExpr); }

    /**
     * Setter method for "bundle" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setBundleExpr(String bundleExpr) { this.bundleExpr = bundleExpr; }
    /**
     * Setter method for "disabled" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setDisabledExpr(String disabledExpr) { this.disabledExpr = disabledExpr; }
    /**
     * Setter method for "key" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setKeyExpr(String keyExpr) { this.keyExpr = keyExpr; }
    /**
     * Setter method for "locale" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setLocaleExpr(String localeExpr) { this.localeExpr = localeExpr; }
    /**
     * Setter method for "style" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setStyleExpr(String styleExpr) { this.styleExpr = styleExpr; }
    /**
     * Setter method for "styleClass" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setStyleClassExpr(String styleClassExpr) { this.styleClassExpr = styleClassExpr; }
    /**
     * Setter method for "styleId" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setStyleIdExpr(String styleIdExpr) { this.styleIdExpr = styleIdExpr; }
    /**
     * Setter method for "value" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setValueExpr(String valueExpr) { this.valueExpr = valueExpr; }

    /**
     * Resets attribute values for tag reuse.
     */
    public void release()
    {
        super.release();
        setBundleExpr(null);
        setDisabledExpr(null);
        setKeyExpr(null);
        setLocaleExpr(null);
        setStyleExpr(null);
        setStyleClassExpr(null);
        setStyleIdExpr(null);
        setValueExpr(null);
    }

    /**
     * Process the start tag.
     *
     * @exception JspException if a JSP exception has occurred
     */
    public int doStartTag() throws JspException {
        evaluateExpressions();
        return(super.doStartTag());
    }

    /**
     * Processes all attribute values which use the JSTL expression evaluation
     * engine to determine their values.
     *
     * @exception JspException if a JSP exception has occurred
     */
    private void evaluateExpressions() throws JspException {
        String  string  = null;
        Boolean bool    = null;

        if ((string = EvalHelper.evalString("bundle", getBundleExpr(),
                                            this, pageContext)) != null)
            setBundle(string);

        if ((bool = EvalHelper.evalBoolean("disabled", getDisabledExpr(),
                                           this, pageContext)) != null)
            setDisabled(bool.booleanValue());

        if ((string = EvalHelper.evalString("key", getKeyExpr(),
                                            this, pageContext)) != null)
            setKey(string);

        if ((string = EvalHelper.evalString("locale", getLocaleExpr(),
                                            this, pageContext)) != null)
            setLocale(string);

        if ((string = EvalHelper.evalString("style", getStyleExpr(),
                                            this, pageContext)) != null)
            setStyle(string);

        if ((string = EvalHelper.evalString("styleClass", getStyleClassExpr(),
                                            this, pageContext)) != null)
            setStyleClass(string);

        if ((string = EvalHelper.evalString("styleId", getStyleIdExpr(),
                                            this, pageContext)) != null)
            setStyleId(string);

        if ((string = EvalHelper.evalString("value", getValueExpr(),
                                            this, pageContext)) != null)
            setValue(string);
    }
}