/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2011, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.test.util;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Set;
import org.junit.Test;
import org.hibernate.internal.util.collections.JoinedIterable;
import org.hibernate.testing.junit4.BaseUnitTestCase;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
/**
* @author Steve Ebersole
*/
public class JoinedIterableTest extends BaseUnitTestCase {
@Test
public void testNullIterables() {
try {
new JoinedIterable<String>( null );
fail();
}
catch (NullPointerException ex) {
// expected
}
}
@Test
public void testSingleEmptyIterable() {
Set<String> emptyList = new HashSet<String>();
List<Iterable<String>> iterableSets = new ArrayList<Iterable<String>>( );
iterableSets.add( emptyList );
Iterable<String> iterable = new JoinedIterable<String>( iterableSets );
assertFalse( iterable.iterator().hasNext() );
try {
iterable.iterator().next();
fail( "Should have thrown NoSuchElementException because the underlying collection is empty.");
}
catch ( NoSuchElementException ex ) {
// expected
}
try {
iterable.iterator().remove();
fail( "Should have thrown IllegalStateException because the underlying collection is empty." );
}
catch ( IllegalStateException ex ) {
// expected
}
for ( String s : iterable ) {
fail( "Should not have entered loop because underlying collection is empty");
}
}
@Test
public void testSingleIterableOfSingletonCollection() {
final String str = "a string";
Set<String> singleTonSet = new HashSet<String>( 1 );
singleTonSet.add( str );
List<Iterable<String>> iterableSets = new ArrayList<Iterable<String>>( );
iterableSets.add( singleTonSet );
Iterable<String> iterable = new JoinedIterable<String>( iterableSets );
assertTrue( iterable.iterator().hasNext() );
assertSame( str, iterable.iterator().next() );
assertFalse( iterable.iterator().hasNext() );
try {
iterable.iterator().next();
fail( "Should have thrown NoSuchElementException because the underlying collection is empty.");
}
catch ( NoSuchElementException ex ) {
// expected
}
for ( String s : iterable ) {
fail( "should not have entered loop because underlying iterator should have been exhausted." );
}
assertEquals( 1, singleTonSet.size() );
iterable = new JoinedIterable<String>( iterableSets );
for ( String s : iterable ) {
assertSame( str, s );
iterable.iterator().remove();
}
assertTrue( singleTonSet.isEmpty() );
}
@Test
public void testJoinedIterables() {
List<Iterable<Integer>> listOfIterables = new ArrayList<Iterable<Integer>>( );
List<Integer> twoElementList = Arrays.asList( 0, 1 );
listOfIterables.add( twoElementList );
List<Integer> emptyList = new ArrayList<Integer>( );
listOfIterables.add( emptyList );
List<Integer> oneElementList = Arrays.asList( 2 );
listOfIterables.add( oneElementList );
List<Integer> threeElementList = Arrays.asList( 3, 4, 5 );
listOfIterables.add( threeElementList );
JoinedIterable<Integer> joinedIterable = new JoinedIterable<Integer>( listOfIterables );
int i = 0;
for ( Integer val : joinedIterable ) {
assertEquals( Integer.valueOf( i ), val );
i++;
}
}
}