org.activemath.content.query
Class DBCaller

java.lang.Object
  org.activemath.content.query.DBCaller

Direct Known Subclasses:

MBaseCaller, UserModelCaller

public abstract class DBCaller
extends Object

Constructor Summary

DBCaller()

Method Summary

protected DBQuery	optimizeDBQuery(DBQuery query) Overide this method to offer a DB-specific optimization.
abstract List	queryAttr(String item, String attr)
abstract Set	queryClass(String item) Give back the set of the class labels of the given item.
abstract List	queryRelation(String item, String rel)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DBCaller

public DBCaller()

Method Detail

optimizeDBQuery

protected DBQuery optimizeDBQuery(DBQuery query)

Overide this method to offer a DB-specific optimization.

queryClass

public abstract Set queryClass(String item)
                        throws NoSuchItemException

Give back the set of the class labels of the given item. An empty set possible?

Parameters:

item - The target item.

Throws:

NoSuchItemException

queryRelation

public abstract List queryRelation(String item,
                                   String rel)
                            throws UnsupportedOntologyQueryException,
                                   NoSuchItemException

Throws:

UnsupportedOntologyQueryException

NoSuchItemException

queryAttr

public abstract List queryAttr(String item,
                               String attr)
                        throws UnsupportedOntologyQueryException,
                               NoSuchItemException

Throws:

UnsupportedOntologyQueryException

NoSuchItemException