/**
 * 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 org.apache.mrql;

import java.io.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.fs.*;


/** a container for long values */
final public class MR_long extends MRData {
    private long value;

    public MR_long () {}

    public MR_long ( long i ) { value = i; }

    public void materializeAll () {};

    public long get () { return value; }

    public void set ( long v ) { value = v; }

    final public void write ( DataOutput out ) throws IOException {
        out.writeByte(MRContainer.LONG);
        WritableUtils.writeVLong(out,value);
    }

    final public static MR_long read ( DataInput in ) throws IOException {
        return new MR_long(WritableUtils.readVLong(in));
    }

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

    private void writeObject ( ObjectOutputStream out ) throws IOException {
        writeData(out);
    }

    public void writeData ( ObjectOutputStream out ) throws IOException {
        WritableUtils.writeVLong(out,value);
    }

    private void readObject ( ObjectInputStream in ) throws IOException, ClassNotFoundException {
        readFields(in);
    }

    public int compareTo ( MRData x ) {
        assert(x instanceof MR_long);
        long v = ((MR_long) x).value;
        return (value == v) ? 0 : ((value > v) ? 1 : -1);
    }

    final public static int compare ( byte[] x, int xs, int xl, byte[] y, int ys, int yl, int[] size ) {
        try {
            size[0] = 1+WritableUtils.decodeVIntSize(x[xs]);
            long v = WritableComparator.readVLong(x,xs)-WritableComparator.readVLong(y,ys);
            return (v == 0) ? 0 : ((v > 0) ? 1 : -1);
        } catch (IOException e) {
            throw new Error(e);
        }
    }

    public boolean equals ( Object x ) {
        return x instanceof MR_long && ((MR_long)x).value==value;
    }

    public int hashCode () { return (int)Math.abs(value); }

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