• Home
• com.shapesecurity
• shape-functional-java
• 1.1.0
• source code
• Pair.java

×

Project download

Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance.
Project price only 1 $

You can buy this project and download/modify it how often you want.

com.shapesecurity.functional.Pair Maven / Gradle / Ivy

/*
 * Copyright 2014 Shape Security, Inc.
 *
 * 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.shapesecurity.functional;

import com.shapesecurity.functional.data.HashCodeBuilder;

import org.jetbrains.annotations.NotNull;

public final class Pair {
    public final A a;
    public final B b;

    /**
     * Constructor method to utilize type inference.
     * @param a first component
     * @param b second component
     * @param  type of the first component
     * @param  type of the second component
     * @return the pair
     */
    @NotNull
    public static  Pair make(A a, B b) {
        return new Pair<>(a, b);
    }

    public Pair(A a, B b) {
        super();
        this.a = a;
        this.b = b;
    }

    @NotNull
    public Pair swap() {
        return new Pair<>(this.b, this.a);
    }

    @NotNull
    public  Pair mapA(@NotNull F f) {
        return new Pair<>(f.apply(this.a), this.b);
    }

    @NotNull
    public  Pair mapB(@NotNull F f) {
        return new Pair<>(this.a, f.apply(this.b));
    }

    @SuppressWarnings("unchecked")
    @Override
    public boolean equals(Object obj) {
        return obj == this || obj instanceof Pair &&
                ((Pair) obj).a.equals(this.a) &&
                ((Pair) obj).b.equals(this.b);
    }

    @Override
    public int hashCode() {
        int hash = HashCodeBuilder.put(HashCodeBuilder.init(), "Tuple2");
        hash = HashCodeBuilder.put(hash, this.a);
        return HashCodeBuilder.put(hash, this.b);
    }
}