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/*
 * 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
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 * 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
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package com.sun.el;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;

import javax.el.ELContext;
import javax.el.ELException;
import javax.el.MethodExpression;
import javax.el.MethodInfo;

import com.sun.el.lang.ELSupport;
import com.sun.el.util.ReflectionUtil;

public class MethodExpressionLiteral extends MethodExpression implements Externalizable {

    private Class expectedType;

    private String expr;
    
    private Class[] paramTypes;
    
    public MethodExpressionLiteral() {
        // do nothing
    }
    
    public MethodExpressionLiteral(String expr, Class expectedType, Class[] paramTypes) {
        this.expr = expr;
        this.expectedType = expectedType;
        this.paramTypes = paramTypes;
    }

    public MethodInfo getMethodInfo(ELContext context) throws ELException {
        return new MethodInfo(this.expr, this.expectedType, this.paramTypes);
    }

    public Object invoke(ELContext context, Object[] params) throws ELException {
        if (this.expectedType == null) {
            return this.expr;
        }

        try {
            return ELSupport.coerceToType(this.expr, this.expectedType);
        } catch (Exception ex) {
            throw new ELException (ex);
        }
    }

    public String getExpressionString() {
        return this.expr;
    }

    public boolean equals(Object obj) {
        return (obj instanceof MethodExpressionLiteral && this.hashCode() == obj.hashCode());
    }

    public int hashCode() {
        return this.expr.hashCode();
    }

    public boolean isLiteralText() {
        return true;
    }

    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        this.expr = in.readUTF();
        String type = in.readUTF();
        if (!"".equals(type)) {
            this.expectedType = ReflectionUtil.forName(type);
        }
        this.paramTypes = ReflectionUtil.toTypeArray(((String[]) in
                .readObject()));
    }

    public void writeExternal(ObjectOutput out) throws IOException {
        out.writeUTF(this.expr);
        out.writeUTF((this.expectedType != null) ? this.expectedType.getName()
                : "");
        out.writeObject(ReflectionUtil.toTypeNameArray(this.paramTypes));
    }
}