/**
* Registers an object consisting of the set of attributes in <i>object</i>. The registration will
* be retained for <i>forHowLong</i> seconds.
*/
public void register(Attribute[] object, int forHowLong) throws Exception {
StringBuffer allAttributes = new StringBuffer();
String completeObject;
byte[][] messageBytes = {null, null};
for (int i = 0; i < object.length; i++)
allAttributes.append(object[i].name + ":" + object[i].value + "\t");
allAttributes.append("\t");
completeObject = allAttributes.toString();
messageBytes[0] = (new CString(completeObject)).toBytes();
messageBytes[1] = NwsMessage.toBytes(forHowLong);
messagePrelude();
NwsMessage.send(connection, NS_REGISTER, NwsMessage.concatenateBytes(messageBytes));
NwsMessage.receive(connection, this);
messagePostlude();
}
/**
* Returns the set of registered objects that match <i>filter</i>, an LDAP-style search filter.
* Each term in a search filter specifies, in parentheses, an attribute name and a value or value
* range which the retrieved objects must have. NWS name servers support the relational operators
* =, <=, and >=, and wild cards (*) can be included in the value of the = operator. Logical
* AND (&), OR (|) and NOT (!) operations may be used as prefix operators, surrounded by another
* set of parentheses, to combine filter terms into more complex filters. A typical filter:
* "(&(hostType=sensor)(|((port=8030))(!(port=80*))))" This would retrieve all sensor
* registrations that have a port attribute which is either equal to 8030 or does not begin with
* 80.
*/
public Attribute[][] search(String filter) throws Exception {
Vector allObjects;
int attributeEnd;
Vector attributes;
int objectEnd;
String object;
String results;
Attribute[][] returnValue;
messagePrelude();
NwsMessage.send(connection, NS_SEARCH, (new CString(filter)).toBytes());
results = (String) NwsMessage.receive(connection, this);
messagePostlude();
allObjects = new Vector();
while (!results.equals("")) {
objectEnd = results.indexOf("\t\t");
if (objectEnd == -1) break; /* Shouldn't happen. */
object = results.substring(0, objectEnd + 1);
results = results.substring(objectEnd + 2);
attributes = new Vector();
while (!object.equals("")) {
attributeEnd = object.indexOf("\t");
attributes.addElement(new Attribute(object.substring(0, attributeEnd)));
object = object.substring(attributeEnd + 1);
}
allObjects.addElement(attributes);
}
returnValue = new Attribute[allObjects.size()][];
for (int i = 0; i < returnValue.length; i++) {
returnValue[i] = new Attribute[((Vector) allObjects.elementAt(i)).size()];
for (int j = 0; j < returnValue[i].length; j++)
returnValue[i][j] = (Attribute) ((Vector) allObjects.elementAt(i)).elementAt(j);
}
return returnValue;
}
public void unregister(String filter) throws Exception {
messagePrelude();
NwsMessage.send(connection, NS_UNREGISTER, (new CString(filter)).toBytes());
NwsMessage.receive(connection, this);
messagePostlude();
}
