/*
 * 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.servlet.jsp.jstl.core;

import javax.el.ELContext;
import javax.el.ValueExpression;

/**
 * @author Jacob Hookom
 * @version $Id: IndexedValueExpression.java,v 1.4 2007/05/06 02:17:13 tcfujii Exp $
 */
public final class IndexedValueExpression extends ValueExpression {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    protected final Integer i;
    protected final ValueExpression orig;

    /**
     * 
     */
    public IndexedValueExpression(ValueExpression orig, int i) {
        this.i = Integer.valueOf(i);
        this.orig = orig;
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.ValueExpression#getValue(javax.el.ELContext)
     */
    public Object getValue(ELContext context) {
        Object base = this.orig.getValue(context);
        if (base != null) {
            context.setPropertyResolved(false);
            return context.getELResolver().getValue(context, base, i);
        }
        return null;
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.ValueExpression#setValue(javax.el.ELContext,
     *      java.lang.Object)
     */
    public void setValue(ELContext context, Object value) {
        Object base = this.orig.getValue(context);
        if (base != null) {
            context.setPropertyResolved(false);
            context.getELResolver().setValue(context, base, i, value);
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.ValueExpression#isReadOnly(javax.el.ELContext)
     */
    public boolean isReadOnly(ELContext context) {
        Object base = this.orig.getValue(context);
        if (base != null) {
            context.setPropertyResolved(false);
            return context.getELResolver().isReadOnly(context, base, i);
        }
        return true;
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.ValueExpression#getType(javax.el.ELContext)
     */
    public Class getType(ELContext context) {
        Object base = this.orig.getValue(context);
        if (base != null) {
            context.setPropertyResolved(false);
            return context.getELResolver().getType(context, base, i);
        }
        return null;
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.ValueExpression#getExpectedType()
     */
    public Class getExpectedType() {
        return Object.class;
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.Expression#getExpressionString()
     */
    public String getExpressionString() {
        return this.orig.getExpressionString();
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.Expression#equals(java.lang.Object)
     */
    public boolean equals(Object obj) {
        return this.orig.equals(obj);
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.Expression#hashCode()
     */
    public int hashCode() {
        return this.orig.hashCode();
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.Expression#isLiteralText()
     */
    public boolean isLiteralText() {
        return false;
    }

}