/*******************************************************************************
* Copyright (c) 2015 Christos Froussios
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*******************************************************************************/
package itrx.chapter2.aggregation;
import static org.junit.Assert.assertEquals;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import org.junit.Test;
import rx.Observable;
import rx.Subscriber;
import rx.observers.TestSubscriber;
public class ToMapExample {
private class PrintSubscriber extends Subscriber<Object>{
private final String name;
public PrintSubscriber(String name) {
this.name = name;
}
@Override
public void onCompleted() {
System.out.println(name + ": Completed");
}
@Override
public void onError(Throwable e) {
System.out.println(name + ": Error: " + e);
}
@Override
public void onNext(Object v) {
System.out.println(name + ": " + v);
}
}
private static class Person {
public final String name;
public final Integer age;
public Person(String name, int age) {
this.name = name;
this.age = age;
}
@Override
public boolean equals(Object obj) {
if (obj instanceof Person) {
Person o = (Person) obj;
return this.name == o.name &&
this.age == o.age;
}
return false;
}
}
public void exampleToMap() {
Observable<Person> values = Observable.just(
new Person("Will", 25),
new Person("Nick", 40),
new Person("Saul", 35)
);
values
.toMap(person -> person.name)
.subscribe(new PrintSubscriber("toMap"));
// toMap: {Saul=Person@7cd84586, Nick=Person@30dae81, Will=Person@1b2c6ec2}
// toMap: Completed
}
public void exampleToMapWithSelector() {
Observable<Person> values = Observable.just(
new Person("Will", 25),
new Person("Nick", 40),
new Person("Saul", 35)
);
values
.toMap(
person -> person.name,
person -> person.age)
.subscribe(new PrintSubscriber("toMap"));
// toMap: {Saul=35, Nick=40, Will=25}
// toMap: Completed
}
public void exampleToMapWithCustomContainer() {
Observable<Person> values = Observable.just(
new Person("Will", 25),
new Person("Nick", 40),
new Person("Saul", 35)
);
values
.toMap(
person -> person.name,
person -> person.age,
() -> new HashMap<String, Integer>())
.subscribe(new PrintSubscriber("toMap"));
// toMap: {Saul=35, Nick=40, Will=25}
// toMap: Completed
}
public void exampleToMultimap() {
Observable<Person> values = Observable.just(
new Person("Will", 35),
new Person("Nick", 40),
new Person("Saul", 35)
);
values
.toMultimap(
person -> person.age,
person -> person.name)
.subscribe(new PrintSubscriber("toMap"));
// toMap: {35=[Will, Saul], 40=[Nick]}
// toMap: Completed
}
public void exampleToMultimapWithCustomContainers() {
Observable<Person> values = Observable.just(
new Person("Will", 35),
new Person("Nick", 40),
new Person("Saul", 35)
);
values
.toMultimap(
person -> person.age,
person -> person.name,
() -> new HashMap<>(),
(key) -> new ArrayList<>())
.subscribe(new PrintSubscriber("toMap"));
// toMap: {35=[Will, Saul], 40=[Nick]}
// toMap: Completed
}
//
// Tests
//
@SuppressWarnings("serial")
@Test
public void testToMap() {
TestSubscriber<Map<String, Person>> tester = new TestSubscriber<>();
Person will = new Person("Will", 25);
Person nick = new Person("Nick", 40);
Person saul = new Person("Saul", 35);
Observable<Person> values = Observable.just(
will, nick, saul
);
values
.toMap(person -> person.name)
.subscribe(tester);
assertEquals(tester.getOnNextEvents(), Arrays.asList(new HashMap<String, Person>() {{
this.put(will.name, will);
this.put(nick.name, nick);
this.put(saul.name, saul);
}}));
tester.assertTerminalEvent();
tester.assertNoErrors();
// toMap: {Saul=Person@7cd84586, Nick=Person@30dae81, Will=Person@1b2c6ec2}
// toMap: Completed
}
@SuppressWarnings("serial")
@Test
public void testToMapWithSelector() {
TestSubscriber<Map<String, Integer>> tester = new TestSubscriber<>();
Person will = new Person("Will", 25);
Person nick = new Person("Nick", 40);
Person saul = new Person("Saul", 35);
Observable<Person> values = Observable.just(
will, nick, saul
);
values
.toMap(
person -> person.name,
person -> person.age)
.subscribe(tester);
assertEquals(tester.getOnNextEvents(), Arrays.asList(new HashMap<String, Integer>() {{
this.put(will.name, will.age);
this.put(nick.name, nick.age);
this.put(saul.name, saul.age);
}}));
tester.assertTerminalEvent();
tester.assertNoErrors();
}
@SuppressWarnings("serial")
@Test
public void testToMapWithCustomContainer() {
TestSubscriber<Map<String, Integer>> tester = new TestSubscriber<>();
Person will = new Person("Will", 25);
Person nick = new Person("Nick", 40);
Person saul = new Person("Saul", 35);
Observable<Person> values = Observable.just(
will, nick, saul
);
values
.toMap(
person -> person.name,
person -> person.age,
() -> new HashMap<String, Integer>())
.subscribe(tester);
assertEquals(tester.getOnNextEvents(), Arrays.asList(new HashMap<String, Integer>() {{
this.put(will.name, will.age);
this.put(nick.name, nick.age);
this.put(saul.name, saul.age);
}}));
tester.assertTerminalEvent();
tester.assertNoErrors();
}
@SuppressWarnings("serial")
@Test
public void testToMultimap() {
TestSubscriber<Map<Integer, Collection<String>>> tester = new TestSubscriber<>();
Person will = new Person("Will", 35);
Person nick = new Person("Nick", 40);
Person saul = new Person("Saul", 35);
Observable<Person> values = Observable.just(
will, nick, saul
);
values
.toMultimap(
person -> person.age,
person -> person.name)
.subscribe(tester);
assertEquals(tester.getOnNextEvents(), Arrays.asList(new HashMap<Integer, Collection<String>>() {{
this.put(35, Arrays.asList(will.name, saul.name));
this.put(40, Arrays.asList(nick.name));
}}));
tester.assertTerminalEvent();
tester.assertNoErrors();
}
@SuppressWarnings("serial")
@Test
public void testToMultimapWithCustomContainers() {
TestSubscriber<Map<Integer, Collection<String>>> tester = new TestSubscriber<>();
Person will = new Person("Will", 35);
Person nick = new Person("Nick", 40);
Person saul = new Person("Saul", 35);
Observable<Person> values = Observable.just(
will, nick, saul
);
values
.toMultimap(
person -> person.age,
person -> person.name,
() -> new HashMap<>(),
(key) -> new ArrayList<>())
.subscribe(tester);
assertEquals(tester.getOnNextEvents(), Arrays.asList(new HashMap<Integer, Collection<String>>() {{
this.put(35, Arrays.asList(will.name, saul.name));
this.put(40, Arrays.asList(nick.name));
}}));
tester.assertTerminalEvent();
tester.assertNoErrors();
}
}