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/*
* Copyright (C) 2010 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 tests.util;
/**
* Pair of typed values.
*
* <p>Pairs are obtained using {@link #of(Object, Object) of}.
*
* @param <F> type of the first value.
* @param <S> type of the second value.
*/
public class Pair<F, S> {
private final F mFirst;
private final S mSecond;
private Pair(F first, S second) {
mFirst = first;
mSecond = second;
}
/**
* Gets the pair consisting of the two provided values.
*
* @param first first value or {@code null}.
* @param second second value or {@code null}.
*/
public static <F, S> Pair<F, S> of(F first, S second) {
return new Pair<F, S>(first, second);
}
/**
* Gets the first value from this pair.
*
* @return value or {@code null}.
*/
public F getFirst() {
return mFirst;
}
/**
* Gets the second value from this pair.
*
* @return value or {@code null}.
*/
public S getSecond() {
return mSecond;
}
@Override
public String toString() {
return "Pair[" + mFirst + ", " + mSecond + "]";
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((mFirst == null) ? 0 : mFirst.hashCode());
result = prime * result + ((mSecond == null) ? 0 : mSecond.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
@SuppressWarnings("rawtypes")
Pair other = (Pair) obj;
if (mFirst == null) {
if (other.mFirst != null) {
return false;
}
} else if (!mFirst.equals(other.mFirst)) {
return false;
}
if (mSecond == null) {
if (other.mSecond != null) {
return false;
}
} else if (!mSecond.equals(other.mSecond)) {
return false;
}
return true;
}
}
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