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/*-
 *  * Copyright 2016 Skymind, 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 org.datavec.api.writable;


import org.datavec.api.io.WritableComparable;
import org.datavec.api.io.WritableComparator;
import org.nd4j.shade.jackson.annotation.JsonProperty;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

/** A WritableComparable for longs. */
public class LongWritable implements WritableComparable {
    private long value;

    public LongWritable() {}

    public LongWritable(@JsonProperty("value") long value) {
        set(value);
    }

    /** Set the value of this LongWritable. */
    public void set(long value) {
        this.value = value;
    }

    /** Return the value of this LongWritable. */
    public long get() {
        return value;
    }

    public void readFields(DataInput in) throws IOException {
        value = in.readLong();
    }

    @Override
    public void writeType(DataOutput out) throws IOException {
        out.writeShort(WritableType.Long.typeIdx());
    }

    public void write(DataOutput out) throws IOException {
        out.writeLong(value);
    }

    /** Returns true iff o is a LongWritable with the same value. */
    public boolean equals(Object o) {
        if (!(o instanceof LongWritable))
            return false;
        LongWritable other = (LongWritable) o;
        return this.value == other.value;
    }

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

    /** Compares two LongWritables. */
    public int compareTo(Object o) {
        long thisValue = this.value;
        long thatValue = ((LongWritable) o).value;
        return (thisValue < thatValue ? -1 : (thisValue == thatValue ? 0 : 1));
    }

    public String toString() {
        return Long.toString(value);
    }

    /** A Comparator optimized for LongWritable. */
    public static class Comparator extends WritableComparator {
        public Comparator() {
            super(LongWritable.class);
        }

        public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) {
            long thisValue = readLong(b1, s1);
            long thatValue = readLong(b2, s2);
            return (thisValue < thatValue ? -1 : (thisValue == thatValue ? 0 : 1));
        }
    }

    /** A decreasing Comparator optimized for LongWritable. */
    public static class DecreasingComparator extends Comparator {
        public int compare(WritableComparable a, WritableComparable b) {
            return -super.compare(a, b);
        }

        public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) {
            return -super.compare(b1, s1, l1, b2, s2, l2);
        }
    }

    static { // register default comparator
        WritableComparator.define(LongWritable.class, new Comparator());
    }

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

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

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

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

    @Override
    public WritableType getType() {
        return WritableType.Long;
    }
}