root/trunk/ProjectFortress/src/com/sun/fortress/interpreter/evaluator/values/OverloadedMethod.java

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    4150 Network Circle, Santa Clara, California 95054, U.S.A.
    All rights reserved.

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package com.sun.fortress.interpreter.evaluator.values;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import com.sun.fortress.interpreter.evaluator.Environment;
import com.sun.fortress.interpreter.evaluator.types.FType;
import com.sun.fortress.nodes_util.NodeFactory;
import com.sun.fortress.useful.BATreeEC;
import com.sun.fortress.useful.HasAt;


public class OverloadedMethod extends OverloadedFunction implements Method {

    BATreeEC<List<FValue>, List<FType>, MethodClosure> mcache =
        new BATreeEC<List<FValue>, List<FType>, MethodClosure>(FValue.asTypesList);


    public OverloadedMethod(String fnName, Environment within) {
        super(NodeFactory.makeId(fnName), within);
        // TODO Auto-generated constructor stub
    }

    public OverloadedMethod(String fnName, Set<? extends Simple_fcn> ssf,
            Environment within) {
        super(NodeFactory.makeId(fnName), ssf, within);
        // TODO Auto-generated constructor stub
    }

    // ??? This appears to be for debugging purposes???
    static int lastBest;

    /** We separate out getApplicableMethod so that overloaded
     *  functional method invocations can perform end-to-end caching
     *  of the applicable method.
     */
    public MethodClosure getApplicableMethod(List<FValue> args, HasAt loc,
            Environment envForInference) {
        MethodClosure best_f = mcache.get(args);
        if (best_f == null) {
            List<Overload>  someOverloads = overloads;
            int best = bestMatchIndex(args, loc, envForInference, someOverloads);
            lastBest = best;

            best_f = ((MethodClosure)someOverloads.get(best).getFn());
            mcache.syncPut(args, best_f);
        }
        return best_f;
    }

    public FValue applyMethod(List<FValue> args, FObject selfValue,
                              HasAt loc, Environment envForInference) {
        Method best_f = getApplicableMethod(args,loc,envForInference);
        return best_f.applyMethod(args, selfValue, loc, envForInference);
    }

    public void bless() {
        overloads = pendingOverloads;
        pendingOverloads = new ArrayList<Overload>();
        super.bless();
    }


}