/*
* 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.group.GroupBy.avg;
import static com.mysema.query.group.GroupBy.groupBy;
import static com.mysema.query.group.GroupBy.list;
import static com.mysema.query.group.GroupBy.map;
import static com.mysema.query.group.GroupBy.max;
import static com.mysema.query.group.GroupBy.min;
import static com.mysema.query.group.GroupBy.set;
import static com.mysema.query.group.GroupBy.sum;
import static junit.framework.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.junit.Ignore;
import org.junit.Test;
import com.mysema.query.group.Group;
import com.mysema.query.types.ConstructorExpression;
import com.mysema.query.types.Projections;
public class GroupByTest {
private static final List<User> users = Arrays.asList(new User("Bob"), new User("Jane"), new User("Jack"));
private static final List<Post> posts = Arrays.asList(
new Post(1, "Post 1", users.get(0)),
new Post(2, "Post 2", users.get(0)),
new Post(3, "Post 3", users.get(1)));
private static final List<Comment> comments = Arrays.asList(
new Comment(1, "Comment 1", users.get(0), posts.get(0)),
new Comment(2, "Comment 2", users.get(1), posts.get(1)),
new Comment(3, "Comment 3", users.get(2), posts.get(1)),
new Comment(4, "Comment 4", users.get(0), posts.get(2)),
new Comment(5, "Comment 5", users.get(1), posts.get(2)),
new Comment(6, "Comment 6", users.get(2), posts.get(2)));
private static final QUser user = QUser.user;
private static final QComment comment = QComment.comment;
private static final QPost post = QPost.post;
private static final ConstructorExpression<Comment> qComment = QComment.create(comment.id, comment.text);
@Test
public void Group_Min() {
Map<Integer, String> results = CollQueryFactory.from(post, posts).from(comment, comments)
.where(comment.post.id.eq(post.id))
.transform(groupBy(post.id).as(min(comment.text)));
assertEquals("Comment 1", results.get(1));
assertEquals("Comment 2", results.get(2));
assertEquals("Comment 4", results.get(3));
}
public void Comments_By_Post() {
Map<Integer, List<Comment>> results = CollQueryFactory.from(post, posts).from(comment, comments)
.where(comment.post.id.eq(post.id))
.transform(groupBy(post.id).as(list(comment)));
assertEquals(1, results.get(1).size());
assertEquals(2, results.get(2).size());
assertEquals(3, results.get(3).size());
}
@Test
public void Group_Max() {
Map<Integer, String> results = CollQueryFactory.from(post, posts).from(comment, comments)
.where(comment.post.id.eq(post.id))
.transform(groupBy(post.id).as(max(comment.text)));
assertEquals("Comment 1", results.get(1));
assertEquals("Comment 3", results.get(2));
assertEquals("Comment 6", results.get(3));
}
@Test
public void Group_Sum() {
Map<Integer, Integer> results = CollQueryFactory.from(post, posts).from(comment, comments)
.where(comment.post.id.eq(post.id))
.transform(groupBy(post.id).as(sum(comment.id)));
assertEquals(1, results.get(1).intValue());
assertEquals(5, results.get(2).intValue());
assertEquals(15, results.get(3).intValue());
}
@Test
public void Group_Avg() {
Map<Integer, Integer> results = CollQueryFactory.from(post, posts).from(comment, comments)
.where(comment.post.id.eq(post.id))
.transform(groupBy(post.id).as(avg(comment.id)));
assertEquals(1, results.get(1).intValue());
assertEquals(2, results.get(2).intValue());
assertEquals(5, results.get(3).intValue());
}
@Test
public void Group_Order() {
Map<Integer, Group> results = CollQueryFactory.from(post, posts).from(comment, comments)
.where(comment.post.id.eq(post.id))
.transform(groupBy(post.id).as(post.name, set(comment.id)));
assertEquals(3, results.size());
}
@Test
public void First_Set_And_List() {
Map<Integer, Group> results = CollQueryFactory.from(post, posts).from(comment, comments)
.where(comment.post.id.eq(post.id))
.transform(groupBy(post.id).as(post.name, set(comment.id), list(comment.text)));
Group group = results.get(1);
assertEquals(toInt(1), group.getOne(post.id));
assertEquals("Post 1", group.getOne(post.name));
assertEquals(toSet(1), group.getSet(comment.id));
assertEquals(Arrays.asList("Comment 1"), group.getList(comment.text));
}
@Test
@Ignore
public void Group_By_Null() {
Map<Integer, Group> results = CollQueryFactory.from(post, posts).from(comment, comments)
.where(comment.post.id.eq(post.id))
.transform(groupBy(post.id).as(post.name, set(comment.id), list(comment.text)));
Group group = results.get(null);
assertNull(group.getOne(post.id));
assertEquals("null post", group.getOne(post.name));
assertEquals(toSet(7, 8), group.getSet(comment.id));
assertEquals(Arrays.asList("comment 7", "comment 8"), group.getList(comment.text));
}
// @Test(expected=NoSuchElementException.class)
// public void NoSuchElementException() {
// Map<Integer, Group> results = BASIC_RESULTS.transform(
// groupBy(postId, postName, set(commentId), list(commentText)));
//
// Group group = results.get(1);
// group.getSet(qComment);
// }
@Test(expected=ClassCastException.class)
public void ClassCastException() {
Map<Integer, Group> results = CollQueryFactory.from(post, posts).from(comment, comments)
.where(comment.post.id.eq(post.id))
.transform(groupBy(post.id).as(post.name, set(comment.id), list(comment.text)));
Group group = results.get(1);
group.getList(comment.id);
}
@Test
@Ignore
public void Map() {
Map<Integer, Group> results = CollQueryFactory.from(post, posts).from(comment, comments)
.where(comment.post.id.eq(post.id))
.transform(groupBy(post.id).as(post.name, map(comment.id, comment.text)));
Group group = results.get(1);
Map<Integer, String> comments = group.getMap(comment.id, comment.text);
assertEquals(1, comments.size());
// assertEquals("comment 2", comments.get(2));
}
@Test
public void Array_Access() {
Map<Integer, Group> results = CollQueryFactory.from(post, posts).from(comment, comments)
.where(comment.post.id.eq(post.id))
.transform(groupBy(post.id).as(post.name, set(comment.id), list(comment.text)));
Group group = results.get(1);
Object[] array = group.toArray();
assertEquals(toInt(1), array[0]);
assertEquals("Post 1", array[1]);
assertEquals(toSet(1), array[2]);
assertEquals(Arrays.asList("Comment 1"), array[3]);
}
@Test
public void Transform_Results() {
Map<Integer, Post> results = CollQueryFactory.from(post, posts).from(comment, comments)
.where(comment.post.id.eq(post.id))
.transform(groupBy(post.id).as(QPost.create(post.id, post.name, set(qComment))));
Post post = results.get(1);
assertNotNull(post);
assertEquals(1, post.getId());
assertEquals("Post 1", post.getName());
assertEquals(1, post.getComments().size());
}
@Test
public void Transform_As_Bean() {
Map<Integer, Post> results = CollQueryFactory.from(post, posts).from(comment, comments)
.where(comment.post.id.eq(post.id))
.transform(groupBy(post.id).as(Projections.bean(Post.class, post.id, post.name, set(qComment).as("comments"))));
Post post = results.get(1);
assertNotNull(post);
assertEquals(1, post.getId());
assertEquals("Post 1", post.getName());
assertEquals(1, post.getComments().size());
}
@Test
public void OneToOneToMany_Projection() {
Map<String, User> results = CollQueryFactory.from(user, users).from(post, posts).from(comment, comments)
.where(user.name.eq(post.user.name), post.id.eq(comment.post.id))
.transform(groupBy(user.name).as(Projections.constructor(User.class, user.name,
QPost.create(post.id, post.name, set(qComment)))));
assertEquals(2, results.size());
User user = results.get("Jane");
Post post = user.getLatestPost();
assertEquals(3, post.getId());
assertEquals("Post 3", post.getName());
assertEquals(3, post.getComments().size());
}
@Test
public void OneToOneToMany_Projection_As_Bean() {
Map<String, User> results = CollQueryFactory.from(user, users).from(post, posts).from(comment, comments)
.where(user.name.eq(post.user.name), post.id.eq(comment.post.id))
.transform(groupBy(user.name).as(Projections.bean(User.class, user.name,
Projections.bean(Post.class, post.id, post.name, set(qComment).as("comments")).as("latestPost"))));
assertEquals(2, results.size());
User user = results.get("Jane");
Post post = user.getLatestPost();
assertEquals(3, post.getId());
assertEquals("Post 3", post.getName());
assertEquals(3, post.getComments().size());
}
@Test
public void OneToOneToMany_Projection_As_Bean_And_Constructor() {
Map<String, User> results = CollQueryFactory.from(user, users).from(post, posts).from(comment, comments)
.where(user.name.eq(post.user.name), post.id.eq(comment.post.id))
.transform(groupBy(user.name).as(Projections.bean(User.class, user.name,
QPost.create(post.id, post.name, set(qComment)).as("latestPost"))));
assertEquals(2, results.size());
User user = results.get("Jane");
Post post = user.getLatestPost();
assertEquals(3, post.getId());
assertEquals("Post 3", post.getName());
assertEquals(3, post.getComments().size());
}
private Integer toInt(int i) {
return Integer.valueOf(i);
}
private <T >Set<T> toSet(T... s) {
return new HashSet<T>(Arrays.asList(s));
}
}