com.google.common.collect.Count.java Source code

Introduction

Here is the source code for com.google.common.collect.Count.java

Source

/*
 * Copyright (C) 2011 The Guava Authors
 *
 * 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.google.common.collect;

import com.google.common.annotations.GwtCompatible;

import java.io.Serializable;

import javax.annotation.Nullable;

/**
 * A mutable value of type {@code int}, for multisets to use in tracking counts of values.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
final class Count implements Serializable {
    private int value;

    Count(int value) {
        this.value = value;
    }

    public int get() {
        return value;
    }

    public int getAndAdd(int delta) {
        int result = value;
        value = result + delta;
        return result;
    }

    public int addAndGet(int delta) {
        return value += delta;
    }

    public void set(int newValue) {
        value = newValue;
    }

    public int getAndSet(int newValue) {
        int result = value;
        value = newValue;
        return result;
    }

    @Override
    public int hashCode() {
        return value;
    }

    @Override
    public boolean equals(@Nullable Object obj) {
        return obj instanceof Count && ((Count) obj).value == value;
    }

    @Override
    public String toString() {
        return Integer.toString(value);
    }
}