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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2012 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:
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 * 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
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 * recipient has the option to distribute your version of this file under
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 */

package com.sun.el;

import java.util.Map;
import java.util.HashMap;
import java.lang.reflect.Method;

import javax.el.ELContext;
import javax.el.ELException;
import javax.el.ExpressionFactory;
import javax.el.MethodExpression;
import javax.el.ValueExpression;
import javax.el.ELResolver;

import com.sun.el.lang.ExpressionBuilder;
import com.sun.el.lang.ELSupport;
import com.sun.el.util.MessageFactory;
import com.sun.el.stream.StreamELResolver;

/**
 * @see javax.el.ExpressionFactory
 * 
 * @author Jacob Hookom [[email protected]]
 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $
 */
public class ExpressionFactoryImpl extends ExpressionFactory {

    /**
     * 
     */
    public ExpressionFactoryImpl() {
        super();
    }

    public Object coerceToType(Object obj, Class type) {
        Object ret;
        try {
            ret = ELSupport.coerceToType(obj, type);
        } catch (IllegalArgumentException ex) {
            throw new ELException(ex);
        }
        return ret;
    }

    public MethodExpression createMethodExpression(ELContext context,
            String expression, Class expectedReturnType,
            Class[] expectedParamTypes) {
        ExpressionBuilder builder = new ExpressionBuilder(expression, context);
        MethodExpression me = builder.createMethodExpression(expectedReturnType,
                expectedParamTypes);
        if (expectedParamTypes == null && !me.isParametersProvided()) {
            throw new NullPointerException(MessageFactory
                    .get("error.method.nullParms"));
        }
        return me;
    }

    public ValueExpression createValueExpression(ELContext context,
            String expression, Class expectedType) {
        if (expectedType == null) {
            throw new NullPointerException(MessageFactory
                    .get("error.value.expectedType"));
        }
        ExpressionBuilder builder = new ExpressionBuilder(expression, context);
        return builder.createValueExpression(expectedType);
    }

    public ValueExpression createValueExpression(Object instance,
            Class expectedType) {
        if (expectedType == null) {
            throw new NullPointerException(MessageFactory
                    .get("error.value.expectedType"));
        }
        return new ValueExpressionLiteral(instance, expectedType);
    }

    @Override
    public ELResolver getStreamELResolver() {
        return new StreamELResolver();
    }

    @Override
    public Map getInitFunctionMap() {
        Map funcs = new HashMap();
/*
        Class genClass = Generation.class;
        try {
            funcs.put("collections:range", genClass.getMethod("range",
                    new Class[] {Integer.TYPE, Integer.TYPE}));
            funcs.put("collections:repeat", genClass.getMethod("repeat",
                    new Class[] {Object.class, Integer.TYPE}));
        } catch (NoSuchMethodException ex) {
            // Should not happen
        }
*/
        return funcs;
    }
}