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The RichFaces core framework.

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2013, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.richfaces.el.util;

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

/**
 * @author Nick Belaevski
 *
 */
public class ConstantValueExpression extends ValueExpression {
    private static final long serialVersionUID = -4455404133234988782L;
    private Object value;

    public ConstantValueExpression(Object value) {
        super();
        this.value = value;
    }

    @Override
    public Object getValue(ELContext context) {
        return value;
    }

    @Override
    public void setValue(ELContext context, Object value) {
        throw new ELException("This expression is read-only");
    }

    @Override
    public boolean isReadOnly(ELContext context) {
        return true;
    }

    @Override
    public Class getType(ELContext context) {
        return null;
    }

    @Override
    public Class getExpectedType() {
        return Object.class;
    }

    @Override
    public String getExpressionString() {
        return null;
    }

    @Override
    public boolean isLiteralText() {
        return false;
    }

    @Override
    public int hashCode() {
        return 0;
    }

    @Override
    public boolean equals(Object obj) {
        return this == obj;
    }
}