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package edu.nps.moves.dis7;

import java.io.*;

/**
 * LSB is absolute or relative timestamp. Scale is 2^31 - 1 divided into one
 * hour.
 *
 * Copyright (c) 2008-2016, MOVES Institute, Naval Postgraduate School. All
 * rights reserved. This work is licensed under the BSD open source license,
 * available at https://www.movesinstitute.org/licenses/bsd.html
 *
 * @author DMcG
 */
public class Timestamp extends Object implements Serializable {

    /**
     * timestamp
     */
    protected long timestamp;

    /**
     * Constructor
     */
    public Timestamp() {
    }

    public int getMarshalledSize() {
        int marshalSize = 0;

        marshalSize = marshalSize + 4;  // timestamp

        return marshalSize;
    }

    public void setTimestamp(long pTimestamp) {
        timestamp = pTimestamp;
    }

    public long getTimestamp() {
        return timestamp;
    }

    /**
     * 0 relative timestamp, 1 host synchronized timestamp
     */
    public int getTimestamp_timestampType() {
        long val = (long) (this.timestamp & (long) 0x1);
        return (int) (val >> 0);
    }

    /**
     * 0 relative timestamp, 1 host synchronized timestamp
     */
    public void setTimestamp_timestampType(int val) {
        long aVal = 0;
        this.timestamp &= (long) (~0x1); // clear bits
        aVal = (long) (val << 0);
        this.timestamp = (long) (this.timestamp | aVal);
    }

    /**
     * 2^31-1 per hour time units
     */
    public int getTimestamp_timestampValue() {
        long val = timestamp & 0xFFFFFFFFL;
        return (int) (val >>> 1);
    }

    /**
     * 2^31-1 per hour time units
     */
    public void setTimestamp_timestampValue(int val) {
        long aVal = 0;
        this.timestamp &= (long) (~0xFE); // clear bits
        aVal = (long) (val << 1);
        this.timestamp = (long) (this.timestamp | aVal);
    }

    public void marshal(DataOutputStream dos) {
        try {
            dos.writeInt((int) timestamp);
        } // end try 
        catch (Exception e) {
            System.out.println(e);
        }
    } // end of marshal method

    public void unmarshal(DataInputStream dis) {
        try {
            timestamp = dis.readInt();
        } // end try 
        catch (Exception e) {
            System.out.println(e);
        }
    } // end of unmarshal method 

    /**
     * Packs a Pdu into the ByteBuffer.
     *
     * @throws java.nio.BufferOverflowException if buff is too small
     * @throws java.nio.ReadOnlyBufferException if buff is read only
     * @see java.nio.ByteBuffer
     * @param buff The ByteBuffer at the position to begin writing
     * @since ??
     */
    public void marshal(java.nio.ByteBuffer buff) {
        buff.putInt((int) timestamp);
    } // end of marshal method

    /**
     * Unpacks a Pdu from the underlying data.
     *
     * @throws java.nio.BufferUnderflowException if buff is too small
     * @see java.nio.ByteBuffer
     * @param buff The ByteBuffer at the position to begin reading
     * @since ??
     */
    public void unmarshal(java.nio.ByteBuffer buff) {
        timestamp = buff.getInt();
    } // end of unmarshal method 


    /*
  * The equals method doesn't always work--mostly it works only on classes that consist only of primitives. Be careful.
     */
    @Override
    public boolean equals(Object obj) {

        if (this == obj) {
            return true;
        }

        if (obj == null) {
            return false;
        }

        if (getClass() != obj.getClass()) {
            return false;
        }

        return equalsImpl(obj);
    }

    /**
     * Compare all fields that contribute to the state, ignoring transient and
     * static fields, for this and the supplied object
     *
     * @param obj the object to compare to
     * @return true if the objects are equal, false otherwise.
     */
    public boolean equalsImpl(Object obj) {
        boolean ivarsEqual = true;

        if (!(obj instanceof Timestamp)) {
            return false;
        }

        final Timestamp rhs = (Timestamp) obj;

        if (!(timestamp == rhs.timestamp)) {
            ivarsEqual = false;
        }

        return ivarsEqual;
    }
} // end of class