/*******************************************************************************
 * Copyright (c) 2009, 2013 Oracle. 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:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.common.utility.tests.internal.iterable;

import java.util.AbstractCollection;
import java.util.AbstractList;
import java.util.Iterator;
import java.util.Vector;
import junit.framework.TestCase;
import org.eclipse.jpt.common.utility.internal.iterable.IterableTools;
import org.eclipse.jpt.common.utility.internal.transformer.DisabledTransformer;
import org.eclipse.jpt.common.utility.internal.transformer.TransformerAdapter;

@SuppressWarnings("nls")
public class ChainIterableTests
	extends TestCase
{
	private final static Class<?>[] VECTOR_HIERARCHY = { Vector.class, AbstractList.class, AbstractCollection.class, Object.class };

	public ChainIterableTests(String name) {
		super(name);
	}


	public void testNextLink() {
		int i = 0;
		for (Class<?> clazz : this.buildIterable()) {
			assertEquals(VECTOR_HIERARCHY[i++], clazz);
		}
	}

	public void testException() {
		Iterable<Class<?>> iterable = IterableTools.chainIterable(Vector.class, DisabledTransformer.<Class<?>, Class<?>>instance());
		Iterator<Class<?>> iterator = iterable.iterator();
		boolean exCaught = false;
		try {
			Class<?> clazz = iterator.next();
			fail("bogus class: " + clazz);
		} catch (RuntimeException ex) {
			exCaught = true;
		}
		assertTrue(exCaught);
	}

	public void testToString() {
		assertNotNull(this.buildIterable().toString());
	}

	private Iterable<Class<?>> buildIterable() {
		return IterableTools.chainIterable(Vector.class, SUPERCLASS_TRANSFORMER);
	}

	private static final TransformerAdapter<Class<?>, Class<?>> SUPERCLASS_TRANSFORMER = new SuperclassTransformer();
	static class SuperclassTransformer
		extends TransformerAdapter<Class<?>, Class<?>>
	{
		@Override
		public Class<?> transform(Class<?> clazz) {
			return clazz.getSuperclass();
		}
	}
}