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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.result.test;
import java.util.Iterator;
import java.util.NoSuchElementException;
import com.yahoo.search.result.DeepHitIterator;
import com.yahoo.search.result.Hit;
import com.yahoo.search.result.HitGroup;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
/**
* Ensure that the {@link DeepHitIterator} works as intended.
*
* @author havardpe
*/
public class DeepHitIteratorTestCase {
@Test
void testEmpty() {
HitGroup hits = new HitGroup();
Iterator<Hit> it = hits.deepIterator();
assertFalse(it.hasNext());
try {
it.next();
fail();
} catch (NoSuchElementException e) {
// regular iterator behavior
}
}
@Test
void testRemove() {
HitGroup hits = new HitGroup();
hits.add(new Hit("foo"));
hits.add(new Hit("bar"));
Iterator<Hit> it = hits.deepIterator();
try {
it.remove();
fail();
} catch (IllegalStateException e) {
// need to call next() first
}
assertTrue(it.hasNext());
assertEquals("foo", it.next().getId().toString());
assertTrue(it.hasNext());
try {
it.remove();
fail();
} catch (IllegalStateException e) {
// prefetch done
}
assertEquals("bar", it.next().getId().toString());
it.remove(); // no prefetch done
assertFalse(it.hasNext());
}
@Test
void testShallow() {
HitGroup hits = new HitGroup();
hits.add(new Hit("foo"));
hits.add(new Hit("bar"));
hits.add(new Hit("baz"));
Iterator<Hit> it = hits.deepIterator();
assertTrue(it.hasNext());
assertEquals("foo", it.next().getId().toString());
assertTrue(it.hasNext());
assertEquals("bar", it.next().getId().toString());
assertTrue(it.hasNext());
assertEquals("baz", it.next().getId().toString());
assertFalse(it.hasNext());
}
@Test
void testDeep() {
HitGroup grandParent = new HitGroup();
grandParent.add(new Hit("a"));
HitGroup parent = new HitGroup();
parent.add(new Hit("b"));
HitGroup child = new HitGroup();
child.add(new Hit("c"));
HitGroup grandChild = new HitGroup();
grandChild.add(new Hit("d"));
child.add(grandChild);
child.add(new Hit("e"));
parent.add(child);
parent.add(new Hit("f"));
grandParent.add(parent);
grandParent.add(new Hit("g"));
Iterator<Hit> it = grandParent.deepIterator();
assertTrue(it.hasNext());
assertEquals("a", it.next().getId().toString());
assertTrue(it.hasNext());
assertEquals("b", it.next().getId().toString());
assertTrue(it.hasNext());
assertEquals("c", it.next().getId().toString());
assertTrue(it.hasNext());
assertEquals("d", it.next().getId().toString());
assertTrue(it.hasNext());
assertEquals("e", it.next().getId().toString());
assertTrue(it.hasNext());
assertEquals("f", it.next().getId().toString());
assertTrue(it.hasNext());
assertEquals("g", it.next().getId().toString());
assertFalse(it.hasNext());
}
@Test
void testFirstHitIsGroup() {
HitGroup root = new HitGroup();
HitGroup group = new HitGroup();
group.add(new Hit("foo"));
root.add(group);
root.add(new Hit("bar"));
Iterator<Hit> it = root.deepIterator();
assertTrue(it.hasNext());
assertEquals("foo", it.next().getId().toString());
assertTrue(it.hasNext());
assertEquals("bar", it.next().getId().toString());
assertFalse(it.hasNext());
}
@Test
void testSecondHitIsGroup() {
HitGroup root = new HitGroup();
root.add(new Hit("foo"));
HitGroup group = new HitGroup();
group.add(new Hit("bar"));
root.add(group);
Iterator<Hit> it = root.deepIterator();
assertTrue(it.hasNext());
assertEquals("foo", it.next().getId().toString());
assertTrue(it.hasNext());
assertEquals("bar", it.next().getId().toString());
assertFalse(it.hasNext());
}
@Test
void testOrder() {
HitGroup root = new HitGroup();
MyHitGroup group = new MyHitGroup();
group.add(new Hit("foo"));
root.add(group);
Iterator<Hit> it = root.deepIterator();
assertTrue(it.hasNext());
assertEquals("foo", it.next().getId().toString());
assertEquals(Boolean.TRUE, group.ordered);
assertFalse(it.hasNext());
it = root.unorderedDeepIterator();
assertTrue(it.hasNext());
assertEquals("foo", it.next().getId().toString());
assertEquals(Boolean.FALSE, group.ordered);
assertFalse(it.hasNext());
}
@SuppressWarnings("serial")
private static class MyHitGroup extends HitGroup {
Boolean ordered = null;
@Override
public Iterator<Hit> iterator() {
ordered = Boolean.TRUE;
return super.iterator();
}
@Override
public Iterator<Hit> unorderedIterator() {
ordered = Boolean.FALSE;
return super.unorderedIterator();
}
}
}
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