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/* Soot - a J*va Optimization Framework
 * Copyright (C) 1997 Clark Verbrugge
 *
 * This library 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 library 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 library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the Sable Research Group and others 1997-1999.  
 * See the 'credits' file distributed with Soot for the complete list of
 * contributors.  (Soot is distributed at http://www.sable.mcgill.ca/soot)
 */







package soot.coffi;

import java.io.*;
import soot.*;

class TypeArray
{
    private Type[] types;

    private TypeArray()
    {
    }

    /**
     * Returns an empty array of types.
     *
     */

    public static TypeArray v(int size)
    {
        TypeArray newArray = new TypeArray();

        newArray.types = new Type[size];

        for(int i =  0; i < size; i++)
            newArray.types[i] = UnusuableType.v();

        return newArray;
    }

    public Type get(int index)
    {
        return types[index];
    }

    public TypeArray set(int index, Type type)
    {
        TypeArray newArray = new TypeArray();

        newArray.types = types.clone();
        newArray.types[index] = type;

        return newArray;
    }

    public boolean equals(Object obj)
    {
        if(obj instanceof TypeArray)
        {
            TypeArray other = (TypeArray) obj;

            if(types.length != other.types.length)
                return false;

            for (Type element : types)
				if(!element.equals(element))
                    return false;

            return true;
        }
        else
            return false;
    }

    public TypeArray merge(TypeArray otherArray)
    {
        TypeArray newArray = new TypeArray();

        if(types.length != otherArray.types.length)
            throw new RuntimeException("Merging of type arrays failed; unequal array length");

        newArray.types = new Type[types.length];

        for(int i = 0; i < types.length; i++)
        {
            if(types[i].equals(otherArray.types[i]))
                newArray.types[i] = types[i];
            else if((types[i] instanceof ArrayType ||
                types[i] instanceof RefType) &&
                (otherArray.types[i] instanceof ArrayType
                    || otherArray.types[i] instanceof RefType))
            {
                // This type merge does not need to be accurate, because it is not really used

                newArray.types[i] = RefType.v("java.lang.Object");
            }
            else {
                newArray.types[i] = UnusuableType.v();
            }
        }
        return newArray;
    }

    public void print(PrintStream out)
    {
        for(int i = 0; i < types.length; i++)
            out.println(i + ": " + types[i].toString());
    }
}