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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 com.android.util;
/**
* A Pair class is simply a 2-tuple for use in this package. We might want to
* think about adding something like this to a more central utility place, or
* replace it by a common tuple class if one exists, or even rewrite the layout
* classes using this Pair by a more dedicated data structure (so we don't have
* to pass around generic signatures as is currently done, though at least the
* construction is helped a bit by the {@link #of} factory method.
*
* @param <S> The type of the first value
* @param <T> The type of the second value
*/
public class Pair<S,T> {
private final S mFirst;
private final T mSecond;
// Use {@link Pair#of} factory instead since it infers generic types
private Pair(S first, T second) {
this.mFirst = first;
this.mSecond = second;
}
/**
* Return the first item in the pair
*
* @return the first item in the pair
*/
public S getFirst() {
return mFirst;
}
/**
* Return the second item in the pair
*
* @return the second item in the pair
*/
public T getSecond() {
return mSecond;
}
/**
* Constructs a new pair of the given two objects, inferring generic types.
*
* @param first the first item to store in the pair
* @param second the second item to store in the pair
* @param <S> the type of the first item
* @param <T> the type of the second item
* @return a new pair wrapping the two items
*/
public static <S,T> Pair<S,T> of(S first, T second) {
return new Pair<S,T>(first,second);
}
@Override
public String toString() {
return "Pair [first=" + mFirst + ", second=" + 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;
}
@SuppressWarnings("unchecked")
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
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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