/* MethodType Copyright (C) 1998-2002 Jochen Hoenicke.
 *
 * This program 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, or (at your option)
 * any later version.
 *
 * This program 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 program; see the file COPYING.LESSER.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id$
 */

package net.sf.jode.type;
import java.util.Map;

import net.sf.jode.bytecode.ClassPath;
import net.sf.jode.bytecode.TypeSignature;
import net.sf.jode.decompiler.ClassDeclarer;
import net.sf.jode.util.SimpleMap;

/** 
 * This type represents an method type.
 *
 * @author Jochen Hoenicke 
 */
public class MethodType extends Type implements GenericDeclarer {
    final String signature;
    final Type[] parameterTypes;
    final Type returnType;
    final String[] genericNames;
    final Type[] genericInstances;
    final GenericDeclarer declarer;
    final ClassPath cp;

    public MethodType(ClassPath cp, GenericDeclarer declarer, String signature, Type[] generics) {
	/* TODO:
	 * We need TypeVariable:  e.g. iff we have
	 * E getElm<E>(Vector<E> v);
	 * then E is a TypeVariable and if we know, that input type is a
	 * vector of Integer, then return value is Integer...
	 * 	
	 * A problem is that casts of v omit the value for E.
	 */
	super(TC_METHOD);
	this.cp = cp;
        this.signature = signature;
	this.declarer = declarer;
	genericInstances = generics;
	genericNames = TypeSignature.getGenericNames(signature);
	if (generics != null) {
	    /* parse generic names */
	    if (generics.length != genericNames.length)
		throw new IllegalArgumentException
		    ("Wrong number of generic parameters");
	}
	if (signature.charAt(0) == '<')
	    signature = signature.substring(signature.indexOf('('));

	String[] params = TypeSignature.getParameterTypes(signature);
	parameterTypes = new Type[params.length];
	for (int i = 0; i < params.length; i++) {
	    parameterTypes[i] = Type.tType(cp, this, params[i]);
	}
	returnType = Type.tType(cp, this, 
				TypeSignature.getReturnType(signature));
    }


    public Type getGeneric(String name) {
	if (genericInstances != null && /*TODO */ genericNames != null) {
	    for (int i = 0; i < genericNames.length; i++)
		if (genericNames[i].equals(name))
		    return genericInstances[i];
	}
	if (declarer != null)
	    return declarer.getGeneric(name);
	return null;
    }

    public final int stackSize() {
	int size = returnType.stackSize();
	for (int i=0; i<parameterTypes.length; i++)
	    size -= parameterTypes[i].stackSize();
	return size;
    }

    public ClassPath getClassPath() {
	return cp;
    }

    public Type[] getParameterTypes() {
        return parameterTypes;
    }

    public Class[] getParameterClasses() throws ClassNotFoundException {
	Class[] paramClasses = new Class[parameterTypes.length];
	for (int i = paramClasses.length; --i >= 0; )
	    paramClasses[i] = parameterTypes[i].getTypeClass();
        return paramClasses;
    }

    public Type getReturnType() {
        return returnType;
    }

    public Class getReturnClass() throws ClassNotFoundException {
	return returnType.getTypeClass();
    }

    public String getTypeSignature() {
        return signature;
    }

    public String toString() {
        return signature;
    }
}