Android Open Source - utexas-utilities My Pair

From Project

License

The source code is released under:

Apache License

If you think the Android project utexas-utilities listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

/*
 * Copyright (C) 2009 The Android Open Source Project
 */*  w w w.  j ava 2s .  com*/
 * 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.nasageek.utexasutilities;

import android.util.Pair;

import java.io.Serializable;

/**
 * Container to ease passing around a tuple of two objects. This object provides
 * a sensible implementation of equals(), returning true if equals() is true on
 * each of the contained objects.
 */
public class MyPair<F, S> implements Serializable {

    private static final long serialVersionUID = 1L;
    public final F first;
    public final S second;

    /**
     * Constructor for a Pair.
     * 
     * @param first the first object in the Pair
     * @param second the second object in the pair
     */
    public MyPair(F first, S second) {
        this.first = first;
        this.second = second;
    }

    /**
     * Checks the two objects for equality by delegating to their respective
     * {@link Object#equals(Object)} methods.
     * 
     * @param o the {@link Pair} to which this one is to be checked for equality
     * @return true if the underlying objects of the Pair are both considered
     *         equal
     */
    @Override
    public boolean equals(Object o) {
        if (!(o instanceof MyPair)) {
            return false;
        }
        MyPair<?, ?> p = (MyPair<?, ?>) o;
        return equals(p.first, first) && equals(p.second, second);
    }

    private boolean equals(Object a, Object b) {
        return (a == b) || (a != null && a.equals(b));
    }

    /**
     * Compute a hash code using the hash codes of the underlying objects
     * 
     * @return a hashcode of the Pair
     */
    @Override
    public int hashCode() {
        return (first == null ? 0 : first.hashCode()) ^ (second == null ? 0 : second.hashCode());
    }

    /**
     * Convenience method for creating an appropriately typed pair.
     * 
     * @param a the first object in the Pair
     * @param b the second object in the pair
     * @return a Pair that is templatized with the types of a and b
     */
    public static <A, B> MyPair<A, B> create(A a, B b) {
        return new MyPair<A, B>(a, b);
    }
}

Java Source Code List