Tomcat example source code file (ELResolver.java)

This example Tomcat source code file (ELResolver.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Tomcat tags/keywords

class, elexception, elexception, elresolver, locale, nullpointerexception, object, object, propertynotfoundexception, propertynotfoundexception, propertynotwritableexception, string, string, text, type, util

The Tomcat ELResolver.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 javax.el;

import java.text.MessageFormat;
import java.util.Iterator;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

/**
 * @author Jacob Hookom [jacob/hookom.net]
 *
 */
public abstract class ELResolver {
	
	static String message(ELContext context, String name, Object[] props) {
		Locale locale = context.getLocale();
		if (locale == null) {
			locale = Locale.getDefault();
			if (locale == null) {
				return "";
			}
		}
		ResourceBundle bundle = ResourceBundle.getBundle(
				"javax.el.LocalStrings", locale);
		try {
			String template = bundle.getString(name);
			if (props != null) {
				template = MessageFormat.format(template, props);
			}
			return template;
		} catch (MissingResourceException e) {
			return "Missing Resource: '" + name + "' for Locale "
					+ locale.getDisplayName();
		}
	}

    public final static String RESOLVABLE_AT_DESIGN_TIME = "resolvableAtDesignTime";
    
    public final static String TYPE = "type";
    
    public abstract Object getValue(ELContext context, Object base, Object property) throws NullPointerException, PropertyNotFoundException, ELException;
    
    public abstract Class<?> getType(ELContext context, Object base, Object property) throws NullPointerException, PropertyNotFoundException, ELException;
    
    public abstract void setValue(ELContext context, Object base, Object property, Object value) throws NullPointerException, PropertyNotFoundException, PropertyNotWritableException, ELException;

    public abstract boolean isReadOnly(ELContext context, Object base, Object property) throws NullPointerException, PropertyNotFoundException, ELException;
    
    public abstract Iterator<java.beans.FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base);
    
    public abstract Class<?> getCommonPropertyType(ELContext context, Object base);
}