/*
File: DataPdu.java
CVS Info: $Id: DataPdu.java,v 1.3 1998/01/28 08:28:17 mcgredo Exp $
Compiler: jdk 1.3
*/
package mil.navy.nps.dis;
import java.util.*;
import java.io.*;
import mil.navy.nps.util.*;
import mil.navy.nps.disEnumerations.*;
/**
* Response to Data Query or Set Data PDU.
*
*@version 1.0
*@author Antonio Alexandre Rua (http://www.garfield.fe.up.pt/~alexrua)
*
*Location:
*Web:
* http://www.web3d.org/WorkingGroups/vrtp/mil/navy/nps/dis/DataPdu.java
*
*or locally:
* ~/mil/navy/nps/dis/DataPdu.java
*
*Hierarchy Diagram:
*
*
*Summary:
* Information issued in response to a Data Query PDU or Set Data PDU
* shall be communicated using a Data PDU.
*
*History:
* 16Sep97 /Antonio Alexandre Rua /New
* 8Dec97 /Ronan Fauglas /changes for documentation templates + complements in documentation
* 11Dec97 /Ronan Fauglas /changed access methods: thisVariable() --> getThisVariable()
* 24Jul00 /Mike Dickson /changed call to clone() in getDatumInformation()
*
*References:
* DIS Data Dictionary:
* Data PDU
* DIS-Java-VRML Working Group:
* http://www.web3d.org/WorkingGroups/vrtp/dis-java-vrml/
* DIS specification : IEEE 1278.1, Section 5.4.6.10, 4.4.5.4.10
*
*@see ProtocolDataUnit
*@see PduElement
*@see SerializationInterface
*@see CreateEntityPdu
*@see RemoveEntityPdu
*@see StartResumePdu
*@see StopFreezePdu
*@see AcknowledgePdu
*@see ActionRequestPdu
*@see ActionResponsePdu
*@see DataQueryPdu
*@see SetDataPdu
*@see DataPdu
*@see EventReportPdu
*@see CommentPdu
*/
public class DataPdu extends SimulationManagementFamily
{
/**
*Request ID - This field shall identify the matching response to a Data Query PDU
*or Set Data PDU made by the simulation manager.
*
*
*- Value:
*
- A 32-bit monotonically increasing integer identifier inserted by the Simulation Manager
* into all Simulation Manager PDUs.
*
- References:
*
- DIS Data Dictionary: Request ID Field
*
*/
protected UnsignedInt requestID;
/**
*Datum Information - This field shall specify the types of datum and their value to be communicated.
*/
protected DatumSpecification datumInformation;
/**
*Constant value--size of a Data PDU without headder(stands for RequestId and padding which is not represented).
*sizeOf = 8 bytes
*/
public static final int sizeOf = 8; // 8 bytes long (stands for RequestId and padding)
/**
*An "exemplar" object, which is filled out to the state that is needed most of the time.
*
*Explanation
*A brand new object has to have most of its values set,
* such as the forceID, protocol version, and so on. This lets the user fill
* out most of the values, save it in the class, then retrieve a copy of it
* as needed.
*/
static protected DataPdu exemplar;
/**
*Default constructor--fills with zeros for all values.
*/
public DataPdu() // default constructor
{
super.setPduType(PduTypeField.DATA);
requestID = new UnsignedInt();
datumInformation = new DatumSpecification();
return;
}
public String pduName()
{
return new String("Data PDU");
}
public void serialize(DataOutputStream outputStream)
{
/**
Serialize our data out to the stream. We first call the superclass,
so that all the data there is written out to the buffer first.
Then we serialize each of our ivars to the stream, being careful
about the order.
*/
//first serialize headers in superclasses
super.serialize(outputStream);
//ivars
requestID.serialize(outputStream);
// padding
try
{
outputStream.writeInt(0);
}
catch(Exception e) {trace("!!! " + e.getMessage());}
datumInformation.serialize(outputStream);
return;
}
public void deSerialize(DataInputStream inputStream)
{
/**
deserialize our data from the stream. We first call the superclass,
so that all the data there is read into the buffer first.
Then we deserialize each of our ivars to the stream, being careful
about the order.
*/
super.deSerialize(inputStream);
// Do our ivars
requestID.deSerialize(inputStream);
// padding
try
{
int i = inputStream.readInt();
}
catch(Exception e) {trace("!!! "+e.getMessage());}
datumInformation.deSerialize(inputStream);
return;
}
public Object clone()
{
/**
Clone the CommentPdu, being careful to not share any pointers between the
new object and the old object.
*/
DataPdu newPdu = (DataPdu)super.clone(); // new entity state pdu
newPdu.setRequestID(requestID.longValue());
newPdu.setDatumInformation(this.getDatumInformation());
return newPdu;
}
public int length()
{
/** calculate the length of the PDU on the fly. This should reflect the current length
of the PDU; if a variable datum is added, you have to call length() again
to find the current length. Note that this is the length of the PDU AS WRITTEN TO
THE WIRE.
*/
int currentLength = 0;
currentLength = super.length() + DataPdu.sizeOf +
datumInformation.length();
return currentLength;
}
public void printValues(int indentLevel, PrintStream printStream)
{
// print the values of the object out, with correct level of
// indentation on the page.
StringBuffer indent = ProtocolDataUnit.getPaddingOfLength(indentLevel);
int idx, superclassIndent = indentLevel;
printStream.println();
printStream.println("Data PDU");
// ugly wart: get the superclass over to the left a couple pixels, if we have any to spare,
// so the header info will be indented a bit less.
if(superclassIndent > 0)
superclassIndent -= 1;
super.printValues(superclassIndent, printStream);
// Yech. This fairly screams for a better way to handle ivars. p-list?
printStream.println(indent + "requestID: " + requestID.longValue() );
datumInformation.printValues(indentLevel,printStream);
return;
}
public DataPdu getExemplar()
{
return (DataPdu)exemplar.clone();
}
public void setExemplar(DataPdu newExemplar)
{
exemplar = newExemplar;
}
// Accessor methods
public UnsignedInt getRequestID()
{ return (UnsignedInt)requestID.clone();
}
public void setRequestID(long pRequestID )
{ requestID = new UnsignedInt(pRequestID);
}
//calls to clone() removed due to weird doubling of the datumSpecification variable vector
//problem needs to be fixed****************************************************************************
public DatumSpecification getDatumInformation()
{ //return (DatumSpecification)datumInformation.clone();
return datumInformation;
}
public void setDatumInformation(DatumSpecification pDatumSpecification)
{ datumInformation = pDatumSpecification;
}
}
*
*