/**
* @param list
* @exception IOException
* @exception DicomException
*/
public CEchoRequestCommandMessage(AttributeList list) throws DicomException, IOException {
groupLength = Attribute.getSingleIntegerValueOrDefault(list, groupLengthTag, 0xffff);
affectedSOPClassUID =
Attribute.getSingleStringValueOrNull(list, TagFromName.AffectedSOPClassUID);
commandField = Attribute.getSingleIntegerValueOrDefault(list, TagFromName.CommandField, 0xffff);
messageID = Attribute.getSingleIntegerValueOrDefault(list, TagFromName.MessageID, 0xffff);
}
/**
* @exception IOException
* @exception DicomException
*/
public CEchoRequestCommandMessage() throws DicomException, IOException {
commandField = MessageServiceElementCommand.C_ECHO_RQ;
messageID = super.getNextAvailableMessageID();
int dataSetType = 0x0101; // none
// NB. The Affected SOP Class UID should have no extra trailing padding, otherwise the
// SCP may fail and send an A-ABORT :) (Part 5 says one null (not space) is allowed)
// This is taken care of by the Attribute.write()
AttributeList list = new AttributeList();
{
AttributeTag t = groupLengthTag;
Attribute a = new UnsignedLongAttribute(t);
a.addValue(0);
list.put(t, a);
}
{
AttributeTag t = TagFromName.AffectedSOPClassUID;
Attribute a = new UniqueIdentifierAttribute(t);
a.addValue(SOPClass.Verification);
list.put(t, a);
}
{
AttributeTag t = TagFromName.CommandField;
Attribute a = new UnsignedShortAttribute(t);
a.addValue(commandField);
list.put(t, a);
}
{
AttributeTag t = TagFromName.MessageID;
Attribute a = new UnsignedShortAttribute(t);
a.addValue(messageID);
list.put(t, a);
}
{
AttributeTag t = TagFromName.CommandDataSetType;
Attribute a = new UnsignedShortAttribute(t);
a.addValue(dataSetType);
list.put(t, a);
}
ByteArrayOutputStream bout = new ByteArrayOutputStream();
DicomOutputStream dout =
new DicomOutputStream(
bout, null /* no meta-header */, TransferSyntax.ImplicitVRLittleEndian);
list.write(dout);
bytes = bout.toByteArray();
groupLength = bytes.length - 12;
bytes[8] = (byte) groupLength; // little endian
bytes[9] = (byte) (groupLength >> 8);
bytes[10] = (byte) (groupLength >> 16);
bytes[11] = (byte) (groupLength >> 24);
// System.err.println("CEchoRequestCommandMessage: bytes="+HexDump.dump(bytes));
}