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This is the master POM file for Oracle's Implementation of the JSF 2.1 Specification.
There is a newer version: 2.1
/*
 * $Id: ValueBinding.java,v 1.15 2007/04/27 22:00:08 ofung Exp $
 */

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. 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.html
 * or glassfish/bootstrap/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 glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [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.faces.el;


import javax.faces.context.FacesContext;


/**
 * ValueBinding is an object that can be used
 * to access the property represented by an action or value binding
 * expression.  An immutable {@link ValueBinding} for a particular value binding
 * can be acquired by calling the createValueBinding() method of
 * the {@link javax.faces.application.Application} instance for this web
 * application.
 *
 * @deprecated This has been replaced by {@link javax.el.ValueExpression}.
 */

public abstract class ValueBinding {


    /**
     * Return the value of the property represented by this
     * {@link ValueBinding}, relative to the specified {@link FacesContext}.
     * 
     *
     * @param context {@link FacesContext} for the current request
     *
     * @throws EvaluationException if an exception is thrown while getting
     *  the value (the thrown exception must be included as the
     *  cause property of this exception)
     * @throws NullPointerException if context
     *  is null
     * @throws PropertyNotFoundException if a specified property name
     *  does not exist, or is not readable
     */
    public abstract Object getValue(FacesContext context)
        throws EvaluationException, PropertyNotFoundException;


    /**
     * Set the value of the property represented by this
     * {@link ValueBinding}, relative to the specified {@link FacesContext}.
     * 
     *
     * @param context {@link FacesContext} for the current request
     * @param value The new value to be set
     *
     * @throws EvaluationException if an exception is thrown while setting
     *  the value (the thrown exception must be included as the
     *  cause property of this exception)
     * @throws NullPointerException if context
     *  is null
     * @throws PropertyNotFoundException if a specified property name
     *  does not exist, or is not writeable
     */
    public abstract void setValue(FacesContext context, Object value)
        throws EvaluationException, PropertyNotFoundException;


    /**
     * Return true if the specified property of the specified
     * property is known to be immutable; otherwise, return
     * false.
     *
     * @param context {@link FacesContext} for the current request
     *
     * @throws EvaluationException if an exception is thrown while getting
     *  the description of the property (the thrown exception must be
     *  included as the cause property of this exception)
     * @throws NullPointerException if context
     *  is null
     * @throws PropertyNotFoundException if a specified property name
     *  does not exist
     */
    public abstract boolean isReadOnly(FacesContext context)
        throws EvaluationException, PropertyNotFoundException;


    /**
     * Return the type of the property represented by this
     * {@link ValueBinding}, relative to the specified {@link FacesContext}.
     * 
     *
     * @param context {@link FacesContext} for the current request
     *
     * @throws EvaluationException if an exception is thrown while getting
     *  the description of the property (the thrown exception must be
     *  included as the cause property of this exception)
     * @throws NullPointerException if context
     *  is null
     * @throws PropertyNotFoundException if a specified property name
     *  does not exist
     */
    public abstract Class getType(FacesContext context)
        throws EvaluationException, PropertyNotFoundException;


    /**
     * Return the (possibly null) expression String,
     * including the delimiters, from which this
     * ValueBinding was built.
     *
     */
    public String getExpressionString() {
	return null;
    }




}