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LeftJoinTest.java
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LeftJoinTest.java
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/*
* Copyright 2011, Mysema Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.mysema.query.collections;
import static com.mysema.query.alias.Alias.$;
import static com.mysema.query.alias.Alias.alias;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.junit.Before;
import org.junit.Test;
public class LeftJoinTest extends AbstractQueryTest {
private QCat cat, kitten;
private List<Cat> cats;
@Before
public void setUp() {
super.setUp();
cat = new QCat("c");
kitten = new QCat("k");
Cat bob = new Cat("Bob");
Cat bob2 = new Cat("Bob");
Cat kate = new Cat("Kate");
Cat kate2 = new Cat("Kate");
Cat franz = new Cat("Franz");
bob.setKittens(Collections.singletonList(bob2));
bob.setKittensByName(Collections.singletonMap(bob2.getName(), bob2));
kate.setKittens(Collections.<Cat>emptyList());
kate.setKittensByName(Collections.singletonMap(kate2.getName(), kate));
cats = Arrays.asList(bob, bob2, kate, kate2, franz);
}
@Test
public void List() {
List<Cat> rv = CollQueryFactory.from(cat, cats)
.leftJoin(cat.kittens, kitten)
.where(kitten.isNotNull(), cat.name.eq(kitten.name))
.orderBy(cat.name.asc())
.list(cat);
assertEquals(1, rv.size());
assertEquals("Bob", rv.get(0).getName());
}
@Test
public void Alias() {
Cat cc = alias(Cat.class, "cat1");
Cat ck = alias(Cat.class, "cat2");
List<Cat> rv = CollQueryFactory.from($(cc), cats)
.leftJoin($(cc.getKittens()), $(ck))
.where($(ck).isNotNull(), $(cc.getName()).eq($(ck.getName())))
.list($(cc));
assertFalse(rv.isEmpty());
}
@Test
public void Map() {
List<Cat> rv = CollQueryFactory.from(cat, cats)
.leftJoin(cat.kittensByName, kitten)
.where(cat.name.eq(kitten.name))
.orderBy(cat.name.asc())
.list(cat);
assertEquals("Bob", rv.get(0).getName());
assertEquals("Kate", rv.get(1).getName());
}
}