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// Copyright (C) 2016 The Android Open Source Project
//
// 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.gerrit.truth;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.truth.Truth.assertAbout;
import com.google.common.truth.FailureStrategy;
import com.google.common.truth.IterableSubject;
import com.google.common.truth.Subject;
import com.google.common.truth.SubjectFactory;
import java.util.List;
import java.util.function.Function;
public class ListSubject<S extends Subject<S, E>, E> extends IterableSubject {
private final Function<E, S> elementAssertThatFunction;
@SuppressWarnings("unchecked")
public static <S extends Subject<S, E>, E> ListSubject<S, E> assertThat(
List<E> list, Function<E, S> elementAssertThatFunction) {
// The ListSubjectFactory always returns ListSubjects.
// -> Casting is appropriate.
return (ListSubject<S, E>)
assertAbout(new ListSubjectFactory<>(elementAssertThatFunction)).that(list);
}
private ListSubject(
FailureStrategy failureStrategy, List<E> list, Function<E, S> elementAssertThatFunction) {
super(failureStrategy, list);
this.elementAssertThatFunction = elementAssertThatFunction;
}
public S element(int index) {
checkArgument(index >= 0, "index(%s) must be >= 0", index);
// The constructor only accepts lists.
// -> Casting is appropriate.
@SuppressWarnings("unchecked")
List<E> list = (List<E>) actual();
isNotNull();
if (index >= list.size()) {
fail("has an element at index " + index);
}
return elementAssertThatFunction.apply(list.get(index));
}
public S onlyElement() {
isNotNull();
hasSize(1);
return element(0);
}
@SuppressWarnings("unchecked")
@Override
public ListSubject<S, E> named(String s, Object... objects) {
// This object is returned which is of type ListSubject.
// -> Casting is appropriate.
return (ListSubject<S, E>) super.named(s, objects);
}
private static class ListSubjectFactory<S extends Subject<S, T>, T>
extends SubjectFactory<IterableSubject, Iterable<?>> {
private Function<T, S> elementAssertThatFunction;
ListSubjectFactory(Function<T, S> elementAssertThatFunction) {
this.elementAssertThatFunction = elementAssertThatFunction;
}
@SuppressWarnings("unchecked")
@Override
public ListSubject<S, T> getSubject(FailureStrategy failureStrategy, Iterable<?> objects) {
// The constructor of ListSubject only accepts lists.
// -> Casting is appropriate.
return new ListSubject<>(failureStrategy, (List<T>) objects, elementAssertThatFunction);
}
}
}
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