/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.errorprone.bugpatterns.testdata;
import java.util.Iterator;
/**
* @author jsjeon@google.com (Jinseong Jeon)
*/
public class IterableAndIteratorNegativeCases {
/**
* Test Node
*/
public static class MyNode {
String tag;
MyNode next;
}
/**
* Test List that implements both Iterator and Iterable
*/
// BUG: Diagnostic contains: both
public static class MyBadList implements Iterator<MyNode>, Iterable<MyNode> {
private MyNode head;
public MyBadList() {
head = null;
}
@Override
public boolean hasNext() {
return head != null;
}
@Override
public MyNode next() {
if (hasNext()) {
MyNode ret = head;
head = head.next;
return ret;
}
return null;
}
@Override
public void remove() {
throw new UnsupportedOperationException("remove is not supported");
}
public void add(MyNode node) {
if (!hasNext()) {
head.next = node;
}
head = node;
}
@Override
public Iterator<MyNode> iterator() {
return this;
}
}
/**
* Test List that extends the above bad implementation
* Diagnostic should bypass this
*/
public static class MyBadListInherited extends MyBadList {
public MyBadListInherited() {}
}
/**
* Test List that implements only Iterator
*/
public static class MyGoodList implements Iterator<MyNode> {
private MyNode head;
public MyGoodList() {
head = null;
}
@Override
public boolean hasNext() {
return head != null;
}
@Override
public MyNode next() {
if (hasNext()) {
MyNode ret = head;
head = head.next;
return ret;
}
return null;
}
@Override
public void remove() {
throw new UnsupportedOperationException("remove is not supported");
}
public void add(MyNode node) {
if (!hasNext()) {
head.next = node;
}
head = node;
}
}
/**
* Test List that implicitly implements both interfaces
*/
// BUG: Diagnostic contains: both
public static class MyImplicitlyBadList extends MyGoodList implements Iterable<MyNode> {
public MyImplicitlyBadList() {}
@Override
public Iterator<MyNode> iterator() {
return this;
}
}
}