common/tests/org.eclipse.jpt.common.utility.tests/src/org/eclipse/jpt/common/utility/tests/internal/iterables/FilteringIterableTests.java

/*******************************************************************************
 * Copyright (c) 2009, 2010 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.iterables;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

import junit.framework.TestCase;

import org.eclipse.jpt.common.utility.Filter;
import org.eclipse.jpt.common.utility.internal.iterables.FilteringIterable;

@SuppressWarnings("nls")
public class FilteringIterableTests extends TestCase {
	private static final String PREFIX = "prefix";

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

	public void testAccept() {
		int i = 0;
		for (String s : this.buildIterable()) {
			assertTrue(s.contains(PREFIX));
			i++;
		}
		assertEquals(6, i);
	}

	public void testFilter() {
		Filter<String> filter = this.buildFilter();
		int i = 0;
		for (String s : new FilteringIterable<String>(this.buildNestedIterable(), filter)) {
			assertTrue(s.contains(PREFIX));
			i++;
		}
		assertEquals(6, i);
	}

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

	public void testMissingFilter() {
		boolean exCaught = false;
		Iterable<String> iterable = new FilteringIterable<String>(this.buildNestedIterable());
		try {
			Iterator<String> iterator = iterable.iterator();
			fail("bogus iterator: " + iterator);
		} catch (RuntimeException ex) {
			exCaught = true;
		}
		assertTrue(exCaught);
	}

	private Iterable<String> buildIterable() {
		return this.buildFilteringIterable(this.buildNestedIterable());
	}

	private Iterable<String> buildFilteringIterable(Iterable<String> nestedIterable) {
		return new FilteringIterable<String>(nestedIterable) {
			@Override
			protected boolean accept(String s) {
				return s.startsWith(PREFIX);
			}
		};
	}

	private Filter<String> buildFilter() {
		return new Filter<String>() {
			public boolean accept(String s) {
				return s.startsWith(PREFIX);
			}
		};
	}

	private Iterable<String> buildNestedIterable() {
		Collection<String> c = new ArrayList<String>();
		c.add(PREFIX + "1");
		c.add(PREFIX + "2");
		c.add(PREFIX + "3");
		c.add("4");
		c.add(PREFIX + "5");
		c.add(PREFIX + "6");
		c.add(PREFIX + "7");
		c.add("8");
		return c;
	}

}