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/* Soot - a J*va Optimization Framework
 * Copyright (C) 1999 Patrick Lam
 *
 * 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.jimple.internal;

import soot.tagkit.*;
import soot.*;
import soot.jimple.*;
import soot.util.*;
import java.util.*;
import soot.grimp.PrecedenceTest;

abstract public class AbstractCastExpr implements CastExpr
{
    ValueBox opBox;
    Type type;

    AbstractCastExpr(Value op, Type type)
    {
        this(Jimple.v().newImmediateBox(op), type);
    }

    public abstract Object clone();

    protected AbstractCastExpr(ValueBox opBox, Type type)
    {
        this.opBox = opBox; this.type = type;
    }

    public boolean equivTo(Object o)
    {
        if (o instanceof AbstractCastExpr)
        {
            AbstractCastExpr ace = (AbstractCastExpr)o;
            return opBox.getValue().equivTo(ace.opBox.getValue()) &&
                type.equals(ace.type);
        }
        return false;
    }

    /** Returns a hash code for this object, consistent with structural equality. */
    public int equivHashCode() 
    {
        return opBox.getValue().equivHashCode() * 101 + type.hashCode() + 17;
    }

    public String toString()
    {
        return "("  + type.toString() + ") " + opBox.getValue().toString();
    }
    
    public void toString(UnitPrinter up) {
        up.literal("(");
        up.type(type);
        up.literal(") ");
        if( PrecedenceTest.needsBrackets( opBox, this ) ) up.literal("(");
        opBox.toString(up);
        if( PrecedenceTest.needsBrackets( opBox, this ) ) up.literal(")");
    }

    public Value getOp()
    {
        return opBox.getValue();
    }

    public void setOp(Value op)
    {
        opBox.setValue(op);
    }

    public ValueBox getOpBox()
    {
        return opBox;
    }

    public List getUseBoxes()
    {
        List list = new ArrayList();

        list.addAll(opBox.getValue().getUseBoxes());
        list.add(opBox);

        return list;
    }

    public Type getCastType()
    {
        return type;
    }

    public void setCastType(Type castType)
    {
        this.type = castType;
    }

    public Type getType()
    {
        return type;
    }

    public void apply(Switch sw)
    {
        ((ExprSwitch) sw).caseCastExpr(this);
    }
}