net.sf.oval.guard.ParameterNameResolverParanamerImpl Maven / Gradle / Ivy

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/*******************************************************************************
 * Portions created by Sebastian Thomschke are copyright (c) 2005-2011 Sebastian
 * Thomschke.
 * 
 * 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:
 *     Sebastian Thomschke - initial implementation.
 *******************************************************************************/
package net.sf.oval.guard;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;

import net.sf.oval.exception.ReflectionException;

import com.thoughtworks.paranamer.BytecodeReadingParanamer;
import com.thoughtworks.paranamer.CachingParanamer;
import com.thoughtworks.paranamer.Paranamer;

/**
 * This implementation that uses com.thoughtworks.paranamer.Paranamer (http://paranamer.codehaus.org/)
 * to determine the names of parameter names as a fallback the results of a 
 * ParameterNameResolverEnumerationImpl are returned
 *  
 * @author Sebastian Thomschke
 */
public class ParameterNameResolverParanamerImpl implements ParameterNameResolver
{
	private static final ParameterNameResolver FALLBACK = new ParameterNameResolverEnumerationImpl();

	private final Paranamer paranamer;

	public ParameterNameResolverParanamerImpl()
	{
		paranamer = new CachingParanamer(new BytecodeReadingParanamer());
	}

	public ParameterNameResolverParanamerImpl(final Paranamer paranamer)
	{
		this.paranamer = paranamer;
	}

	/**
	 * {@inheritDoc}
	 */
	public String[] getParameterNames(final Constructor< ? > constructor) throws ReflectionException
	{
		return FALLBACK.getParameterNames(constructor);
	}

	/**
	 * {@inheritDoc}
	 */
	public String[] getParameterNames(final Method method) throws ReflectionException
	{
		final String[] parameterNames = paranamer.lookupParameterNames(method);

		if (parameterNames == null) return FALLBACK.getParameterNames(method);

		return parameterNames;
	}
}