JavaExtensionFunction.java

/*
Copyright (c) 2008 Arno Haase, Andr� Arnold.
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
    Andr� Arnold
 */
package org.eclipse.xtend.middleend.xtend.internal.xtend;

import java.lang.reflect.Method;
import java.util.List;

import org.eclipse.xtend.backend.common.BackendType;
import org.eclipse.xtend.backend.common.EfficientLazyString;
import org.eclipse.xtend.backend.common.ExecutionContext;
import org.eclipse.xtend.backend.functions.AbstractFunction;
import org.eclipse.xtend.backend.util.ErrorHandler;


/**
 * 
 * @author Arno Haase (http://www.haase-consulting.com)
 * @author Andr� Arnold
 */
final class JavaExtensionFunction extends AbstractFunction {
    private final Method _mtd;

    public JavaExtensionFunction (Method mtd, boolean cached, List<? extends BackendType> paramTypes, BackendType returnType) {
        super (null, paramTypes, returnType, cached);
        _mtd = mtd;
    }
    
    public String getName () {
        return _mtd.getName();
    }

    public Object invoke (ExecutionContext ctx, Object[] params) {
        try {
        	for (int i = 0; i < params.length; i++) {
				if (params[i] instanceof EfficientLazyString) {
					params[i] = params[i].toString();
				}
			}
            return _mtd.invoke (null, params);
        } catch (Exception e) {
            ErrorHandler.handle(e);
            return null; // to make the compiler happy - this is never executed
        }
    }
}