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/*
Copyright (c) 2008 Arno Haase.
All rights reserved. This program and the accompanying materials
are made available under the terms of the Eclipse Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/epl-v10.html

Contributors:
    Arno Haase - initial API and implementation
 */
package org.eclipse.xtend.backend.types.builtin;

import java.util.Arrays;
import java.util.List;

import org.eclipse.xtend.backend.common.BackendType;
import org.eclipse.xtend.backend.common.ExecutionContext;
import org.eclipse.xtend.backend.common.ExpressionBase;
import org.eclipse.xtend.backend.common.Function;
import org.eclipse.xtend.backend.common.FunctionDefContext;
import org.eclipse.xtend.backend.types.AbstractType;


/**
 * 
 * @author Arno Haase (http://www.haase-consulting.com)
 */
public final class FunctionType extends AbstractType {
    public static final FunctionType INSTANCE = new FunctionType ();
    
    private FunctionType () {
        super ("Function"); 

        register ("invoke", new Function () {
            public List<BackendType> getParameterTypes() {
                return Arrays.asList(new BackendType[] {FunctionType.INSTANCE, ListType.INSTANCE});
            }
            
            public Object invoke (ExecutionContext ctx, Object[] params) {
                return ctx.getFunctionInvoker().invoke(ctx, (Function) params[0], (List<?>) params[1]);
            }
            
            public boolean isCached() {
                return false;
            }
            
            public ExpressionBase getGuard() {
                return null;
            }

            public FunctionDefContext getFunctionDefContext () {
                return null;
            }

            public void setFunctionDefContext (FunctionDefContext fdc) {
                throw new UnsupportedOperationException ();
            }
        });
    }
    
    @Override
    public boolean isAssignableFrom (BackendType other) {
        return other == this || other == VoidType.INSTANCE;
    }
}