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BeanNameResolver.java
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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2012 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.el;
/**
* Resolves a bean by its known name.
* This class can be extended to return a bean object given its name,
* to set a value to an existing bean, or to create a bean with the value.
* @see BeanNameELResolver
*
* @since EL 3.0
*/
public abstract class BeanNameResolver {
/**
* Returns whether the given name is resolved by the BeanNameResolver
*
* @param beanName The name of the bean.
* @return true if the name is resolved by this BeanNameResolver; false
* otherwise.
*/
public boolean isNameResolved(String beanName) {
return false;
}
/**
* Returns the bean known by its name.
* @param beanName The name of the bean.
* @return The bean with the given name. Can be <code>null</code>.
*
*/
public Object getBean(String beanName) {
return null;
}
/**
* Sets a value to a bean of the given name.
* If the bean of the given name
* does not exist and if {@link #canCreateBean} is <code>true</code>,
* one is created with the given value.
* @param beanName The name of the bean
* @param value The value to set the bean to. Can be <code>null</code>.
* @throws PropertyNotWritableException if the bean cannot be
* modified or created.
*/
public void setBeanValue(String beanName, Object value)
throws PropertyNotWritableException {
throw new PropertyNotWritableException();
}
/**
* Indicates if the bean of the given name is read-only or writable
* @param beanName The name of the bean
* @return <code>true</code> if the bean can be set to a new value.
* <code>false</code> otherwise.
*/
public boolean isReadOnly(String beanName) {
return true;
}
/**
* Allow creating a bean of the given name if it does not exist.
* @param beanName The name of the bean
* @return <code>true</code> if bean creation is supported
* <code>false</code> otherwise.
*/
public boolean canCreateBean(String beanName) {
return false;
}
}