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package com.levelup.java.collections;
import static org.junit.Assert.assertTrue;
import java.util.List;
import org.apache.commons.collections.CollectionUtils;
import org.junit.Before;
import org.junit.Test;
import com.google.common.base.Objects;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
/**
* This java example will demonstrate if a list containing any element.
*
* @author Justin Musgrove
* @see <a href=
* 'http://www.leveluplunch.com/java/examples/list-contains-any-elements/'>List
* contains any element</a>
*/
public class ListContainsAny {
class Vehicle {
String manufacturer;
String model;
int year;
public Vehicle(String manufacturer, String model, int year) {
super();
this.manufacturer = manufacturer;
this.model = model;
this.year = year;
}
@Override
public String toString() {
return Objects.toStringHelper(this)
.add("manufacturer", manufacturer).add("model", model)
.add("year", year).toString();
}
}
List<Vehicle> vehicles;
@Before
public void setUp() {
vehicles = Lists.newArrayList();
vehicles.add(new Vehicle("Dodge", "CHARGER", 1965));
vehicles.add(new Vehicle("Dodge", "VIPER CONVERTIBLE", 2006));
vehicles.add(new Vehicle("Oldsmobile", "BRAVADA", 2004));
vehicles.add(new Vehicle("GMC", "C1500 YUKON 2WD HYBRID", 2012));
vehicles.add(new Vehicle("GMC", "K1500 YUKON 4WD", 2013));
vehicles.add(new Vehicle("Chrysler", "PT Cruiser", 2006));
}
@Test
public void list_contains_any_java() {
// assuming 2013
boolean vehiclesFiveYearOrOlder = false;
for (Vehicle vehicle : vehicles) {
if ((vehicle.year - 5) <= 2008) {
vehiclesFiveYearOrOlder = true;
break;
}
}
assertTrue(vehiclesFiveYearOrOlder);
}
@Test
public void list_contains_any_java8_lambda() {
boolean vehiclesContainDodge = vehicles.stream().anyMatch(
p -> p.manufacturer.equals("Dodge"));
assertTrue(vehiclesContainDodge);
}
@Test
public void list_contains_any_guava() {
boolean vehiclesContainDodge = Iterables.any(vehicles,
new Predicate<Vehicle>() {
public boolean apply(Vehicle input) {
return input.manufacturer.equals("Dodge");
}
});
assertTrue(vehiclesContainDodge);
}
@Test
public void list_contains_any_apache_commons() {
boolean vehiclesContainYukon = CollectionUtils.exists(vehicles,
new org.apache.commons.collections.Predicate() {
public boolean evaluate(Object object) {
Vehicle vehicle = (Vehicle) object;
return vehicle.model.contains("YUKON");
}
});
assertTrue(vehiclesContainYukon);
}
}