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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 hivemall.utils.lang.mutable;

import hivemall.utils.lang.Copyable;

import java.io.Serializable;

public final class MutableLong extends Number
        implements Copyable, Comparable, Serializable {
    private static final long serialVersionUID = 4215176730382645660L;

    private long value;

    public MutableLong() {
        super();
    }

    public MutableLong(long value) {
        super();
        this.value = value;
    }

    public MutableLong(Number value) {
        super();
        this.value = value.longValue();
    }

    public void addValue(long o) {
        value += o;
    }

    public long getValue() {
        return value;
    }

    public void setValue(long value) {
        this.value = value;
    }

    public void setValue(Number value) {
        this.value = value.longValue();
    }

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

    @Override
    public long longValue() {
        return value;
    }

    @Override
    public float floatValue() {
        return value;
    }

    @Override
    public double doubleValue() {
        return value;
    }

    @Override
    public void copyTo(MutableLong another) {
        another.setValue(value);
    }

    @Override
    public void copyFrom(MutableLong another) {
        this.value = another.value;
    }

    @Override
    public int compareTo(MutableLong other) {
        return compare(value, other.value);
    }

    private static int compare(final long x, final long y) {
        return (x < y) ? -1 : ((x == y) ? 0 : 1);
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof MutableLong) {
            return value == ((MutableLong) obj).longValue();
        }
        return false;
    }

    @Override
    public int hashCode() {
        return (int) (value ^ (value >>> 32));
    }

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

}