elmessagetag.java

Struts源码

/*
 * $Id: ELMessageTag.java 54933 2004-10-16 17:04:52Z germuska $ 
 *
 * 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.bean;

import javax.servlet.jsp.JspException;

import org.apache.struts.taglib.bean.MessageTag;
import org.apache.strutsel.taglib.utils.EvalHelper;

/**
 * Custom tag that retrieves an internationalized messages string (with
 * optional parametric replacement) from the <code>ActionResources</code>
 * object stored as a context attribute by our associated
 * <code>ActionServlet</code> implementation.
 *<p>
 * This class is a subclass of the class
 * <code>org.apache.struts.taglib.bean.MessageTag</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 $Rev: 54933 $
 */
public class ELMessageTag extends MessageTag {

    /**
     * Instance variable mapped to "arg0" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String arg0Expr;
    /**
     * Instance variable mapped to "arg1" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String arg1Expr;
    /**
     * Instance variable mapped to "arg2" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String arg2Expr;
    /**
     * Instance variable mapped to "arg3" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String arg3Expr;
    /**
     * Instance variable mapped to "arg4" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String arg4Expr;
    /**
     * Instance variable mapped to "bundle" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String bundleExpr;
    /**
     * 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 "name" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String nameExpr;
    /**
     * Instance variable mapped to "property" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String propertyExpr;
    /**
     * Instance variable mapped to "scope" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    private String scopeExpr;

    /**
     * Getter method for "arg0" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getArg0Expr() { return (arg0Expr); }
    /**
     * Getter method for "arg1" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getArg1Expr() { return (arg1Expr); }
    /**
     * Getter method for "arg2" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getArg2Expr() { return (arg2Expr); }
    /**
     * Getter method for "arg3" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getArg3Expr() { return (arg3Expr); }
    /**
     * Getter method for "arg4" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getArg4Expr() { return (arg4Expr); }
    /**
     * Getter method for "bundle" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getBundleExpr() { return (bundleExpr); }
    /**
     * 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 "name" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getNameExpr() { return (nameExpr); }
    /**
     * Getter method for "property" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getPropertyExpr() { return (propertyExpr); }
    /**
     * Getter method for "scope" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public String getScopeExpr() { return (scopeExpr); }

    /**
     * Setter method for "arg0" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setArg0Expr(String arg0Expr) { this.arg0Expr = arg0Expr; }
    /**
     * Setter method for "arg1" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setArg1Expr(String arg1Expr) { this.arg1Expr = arg1Expr; }
    /**
     * Setter method for "arg2" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setArg2Expr(String arg2Expr) { this.arg2Expr = arg2Expr; }
    /**
     * Setter method for "arg3" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setArg3Expr(String arg3Expr) { this.arg3Expr = arg3Expr; }
    /**
     * Setter method for "arg4" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setArg4Expr(String arg4Expr) { this.arg4Expr = arg4Expr; }
    /**
     * Setter method for "bundle" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setBundleExpr(String bundleExpr) { this.bundleExpr = bundleExpr; }
    /**
     * 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 "name" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setNameExpr(String nameExpr) { this.nameExpr = nameExpr; }
    /**
     * Setter method for "property" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setPropertyExpr(String propertyExpr) { this.propertyExpr = propertyExpr; }
    /**
     * Setter method for "scope" tag attribute.
     * (Mapping set in associated BeanInfo class.)
     */
    public void setScopeExpr(String scopeExpr) { this.scopeExpr = scopeExpr; }

    /**
     * Resets attribute values for tag reuse.
     */
    public void release()
    {
        super.release();
        setArg0Expr(null);
        setArg1Expr(null);
        setArg2Expr(null);
        setArg3Expr(null);
        setArg4Expr(null);
        setBundleExpr(null);
        setKeyExpr(null);
        setLocaleExpr(null);
        setNameExpr(null);
        setPropertyExpr(null);
        setScopeExpr(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;


        if ((string = EvalHelper.evalString("arg0", getArg0Expr(),
                                            this, pageContext)) != null)
            setArg0(string);

        if ((string = EvalHelper.evalString("arg1", getArg1Expr(),
                                            this, pageContext)) != null)
            setArg1(string);

        if ((string = EvalHelper.evalString("arg2", getArg2Expr(),
                                            this, pageContext)) != null)
            setArg2(string);

        if ((string = EvalHelper.evalString("arg3", getArg3Expr(),
                                            this, pageContext)) != null)
            setArg3(string);

        if ((string = EvalHelper.evalString("arg4", getArg4Expr(),
                                            this, pageContext)) != null)
            setArg4(string);

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

        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("name", getNameExpr(),
                                            this, pageContext)) != null)
            setName(string);

        if ((string = EvalHelper.evalString("property", getPropertyExpr(),
                                            this, pageContext)) != null)
            setProperty(string);

        if ((string = EvalHelper.evalString("scope", getScopeExpr(),
                                            this, pageContext)) != null)
            setScope(string);
    }
}