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add and test helper to easily get random routes and jobs from collection

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This commit is contained in:
oblonski 2015-01-14 19:57:59 +01:00
parent b357bed413
commit 3402bb413e
2 changed files with 52 additions and 10 deletions
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18
jsprit-core/src/main/java/jsprit/core/util/RandomUtils.java
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@ -12,20 +12,18 @@ import java.util.Random;
public class RandomUtils {
public static VehicleRoute nextRoute(Collection<VehicleRoute> routes, Random random){
int randomIndex = random.nextInt(routes.size());
int count = 0;
for(VehicleRoute route : routes){
if(count <= randomIndex) return route;
count++;
}
return null;
return nextItem(routes,random);
}
public static Job nextJob(Collection<Job> jobs, Random random){
int randomIndex = random.nextInt(jobs.size());
return nextItem(jobs,random);
}
public static <T> T nextItem(Collection<T> items, Random random){
int randomIndex = random.nextInt(items.size());
int count = 0;
for(Job job : jobs){
if(count <= randomIndex) return job;
for(T item : items){
if(count == randomIndex) return item;
count++;
}
return null;

44
jsprit-core/src/test/java/jsprit/core/util/RandomUtilsTest.java Normal file
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@ -0,0 +1,44 @@
package jsprit.core.util;
import jsprit.core.problem.job.Job;
import junit.framework.Assert;
import org.junit.Test;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Random;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
/**
* Created by schroeder on 14/01/15.
*/
public class RandomUtilsTest {
@Test
public void shouldReturnSingleJob(){
Job job = mock(Job.class);
Collection<Job> jobs = Arrays.asList(job);
Assert.assertEquals(job, RandomUtils.nextItem(jobs, RandomNumberGeneration.getRandom()));
}
@Test
public void shouldReturnSingleJob_(){
Job job = mock(Job.class);
Collection<Job> jobs = Arrays.asList(job);
Assert.assertEquals(job, RandomUtils.nextJob(jobs, RandomNumberGeneration.getRandom()));
}
@Test
public void shouldReturnJob3(){
Job job3 = mock(Job.class);
List<Job> jobs = Arrays.asList(mock(Job.class),mock(Job.class),job3);
Random random = mock(Random.class);
when(random.nextInt(jobs.size())).thenReturn(2);
Assert.assertEquals(job3,RandomUtils.nextJob(jobs,random));
}
}