108 lines
3.3 KiB
Java
108 lines
3.3 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.utils;
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/**
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* A Pair class is simply a 2-tuple for use in this package. We might want to
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* think about adding something like this to a more central utility place, or
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* replace it by a common tuple class if one exists, or even rewrite the layout
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* classes using this Pair by a more dedicated data structure (so we don't have
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* to pass around generic signatures as is currently done, though at least the
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* construction is helped a bit by the {@link #of} factory method.
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*
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* @param <S> The type of the first value
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* @param <T> The type of the second value
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*/
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public class Pair<S,T> {
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private final S mFirst;
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private final T mSecond;
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// Use {@link Pair#of} factory instead since it infers generic types
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private Pair(S first, T second) {
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this.mFirst = first;
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this.mSecond = second;
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}
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/**
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* Return the first item in the pair
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*
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* @return the first item in the pair
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*/
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public S getFirst() {
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return mFirst;
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}
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/**
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* Return the second item in the pair
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*
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* @return the second item in the pair
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*/
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public T getSecond() {
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return mSecond;
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}
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/**
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* Constructs a new pair of the given two objects, inferring generic types.
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*
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* @param first the first item to store in the pair
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* @param second the second item to store in the pair
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* @param <S> the type of the first item
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* @param <T> the type of the second item
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* @return a new pair wrapping the two items
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*/
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public static <S,T> Pair<S,T> of(S first, T second) {
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return new Pair<S,T>(first,second);
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}
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@Override
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public String toString() {
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return "Pair [first=" + mFirst + ", second=" + mSecond + "]";
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + ((mFirst == null) ? 0 : mFirst.hashCode());
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result = prime * result + ((mSecond == null) ? 0 : mSecond.hashCode());
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return result;
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}
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@SuppressWarnings("unchecked")
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@Override
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public boolean equals(Object obj) {
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if (this == obj)
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return true;
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if (obj == null)
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return false;
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if (getClass() != obj.getClass())
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return false;
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Pair other = (Pair) obj;
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if (mFirst == null) {
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if (other.mFirst != null)
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return false;
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} else if (!mFirst.equals(other.mFirst))
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return false;
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if (mSecond == null) {
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if (other.mSecond != null)
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return false;
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} else if (!mSecond.equals(other.mSecond))
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return false;
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return true;
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}
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}
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