// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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package jodd.util.collection;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import org.junit.Test;
public class CompositeIteratorTest {
@Test
public void testNextWithOne() {
CompositeIterator<Integer> compositeIterator = new CompositeIterator<>();
try {
compositeIterator.next();
fail();
} catch (NoSuchElementException e) {
// ignore
}
List<Integer> list = createList(4);
Iterator<Integer> iterator = list.iterator();
compositeIterator.add(iterator);
try {
compositeIterator.add(iterator);
fail();
} catch (IllegalArgumentException iaex) {
// ignore
}
int count = list.size();
StringBuilder sb = new StringBuilder();
while (compositeIterator.hasNext()) {
sb.append(compositeIterator.next());
count--;
}
assertEquals(0, count);
assertEquals("0123", sb.toString());
}
@Test
public void testRemoveWithOne() {
CompositeIterator compositeIterator = new CompositeIterator();
List list = createList(4);
compositeIterator.add(list.iterator());
int count = list.size();
while (compositeIterator.hasNext()) {
compositeIterator.next();
compositeIterator.remove();
count--;
}
assertEquals(0, count);
assertEquals(0, list.size());
}
@Test
public void testNextWithTwo() {
CompositeIterator compositeIterator = new CompositeIterator();
List list = createList(4);
int count = list.size();
compositeIterator.add(list.iterator());
list = createList(4);
count += list.size();
compositeIterator.add(list.iterator());
StringBuilder sb = new StringBuilder();
while (compositeIterator.hasNext()) {
sb.append(compositeIterator.next());
count--;
}
assertEquals(0, count);
assertEquals("01230123", sb.toString());
}
@Test
public void testRemoveWithTwo() {
List<Integer> list1 = createList(4);
List<Integer> list2 = createList(4);
int count = list1.size() + list2.size();
CompositeIterator compositeIterator = new CompositeIterator();
compositeIterator.add(list1.iterator());
compositeIterator.add(list2.iterator());
while (compositeIterator.hasNext()) {
compositeIterator.next();
compositeIterator.remove();
count--;
}
assertEquals(0, count);
assertEquals(0, list1.size());
assertEquals(0, list2.size());
}
@Test
public void testNextWithThree() {
List<Integer> list1 = createList(4);
List<Integer> list2 = createList(4);
List<Integer> list3 = createList(4);
int count = list1.size() + list2.size() + list3.size();
CompositeIterator<Integer> compositeIterator = new CompositeIterator<>();
compositeIterator.add(list1.iterator());
compositeIterator.add(list2.iterator());
compositeIterator.add(list3.iterator());
while (compositeIterator.hasNext()) {
compositeIterator.next();
count--;
}
assertEquals(0, count);
}
@Test
public void testRemoveWithThree() {
List<Integer> list1 = createList(4);
List<Integer> list2 = new ArrayList<>();
List<Integer> list3 = createList(4);
int count = list1.size() + list2.size() + list3.size();
CompositeIterator<Integer> compositeIterator = new CompositeIterator<>();
compositeIterator.add(list1.iterator());
compositeIterator.add(list2.iterator());
compositeIterator.add(list3.iterator());
while (compositeIterator.hasNext()) {
compositeIterator.next();
compositeIterator.remove();
count--;
}
assertEquals(0, count);
assertEquals(0, list1.size());
assertEquals(0, list2.size());
assertEquals(0, list3.size());
}
@Test
public void testRemoveFail() {
List<Integer> list1 = createList(4);
List<Integer> list2 = createList(4);
CompositeIterator<Integer> compositeIterator = new CompositeIterator<>();
compositeIterator.add(list1.iterator());
compositeIterator.add(list2.iterator());
try {
compositeIterator.remove();
fail();
} catch (Exception e) {
// ignore
}
}
@Test
public void testPartialIterationWithThree1() {
List<Integer> list1 = createList(4);
Iterator<Integer> it1 = list1.iterator();
List<Integer> list2 = createList(3);
Iterator<Integer> it2 = list2.iterator();
List<Integer> list3 = createList(2);
Iterator<Integer> it3 = list3.iterator();
it1.next();
it2.next();
it3.next();
CompositeIterator<Integer> compositeIterator = new CompositeIterator<>(it1, it2, it3);
int count = 0;
StringBuilder sb = new StringBuilder();
while (compositeIterator.hasNext()) {
Integer next = compositeIterator.next();
sb.append(next);
count++;
}
assertEquals(6, count);
assertEquals("123121", sb.toString());
}
@Test
public void testPartialIterationWithThree2() {
List<Integer> list1 = createList(4);
Iterator<Integer> it1 = list1.iterator();
List<Integer> list2 = createList(3);
Iterator<Integer> it2 = list2.iterator();
List<Integer> list3 = createList(2);
Iterator<Integer> it3 = list3.iterator();
it1.next();
it2.next(); it2.next(); it2.next();
it3.next();
CompositeIterator<Integer> compositeIterator = new CompositeIterator<>(it1, it2, it3);
int count = 0;
StringBuilder sb = new StringBuilder();
while (compositeIterator.hasNext()) {
Integer next = compositeIterator.next();
sb.append(next);
count++;
}
assertEquals(4, count);
assertEquals("1231", sb.toString());
}
// ---------------------------------------------------------------- util
private List<Integer> createList(int count) {
List<Integer> list = new ArrayList<>(count);
for (int i = 0; i < count; i++) {
list.add(Integer.valueOf(i));
}
return list;
}
}