javax.wbem.query
Class QueryExp

java.lang.Object
  |
  +--javax.wbem.query.QueryExp

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

AndQueryExp, BinaryRelQueryExp, NotQueryExp, OrQueryExp

public abstract class QueryExp

extends java.lang.Object

implements java.io.Serializable

The QueryExp class is an abstract class whose subclasses represent conditional expressions which return a boolean value when a particular 'row' is applied to them.

Since:

WBEM 1.0

Constructor Summary

QueryExp()
Constructor.

Method Summary

boolean	apply(CIMElement obj) When a 'row' is applied to this method it returns true or false depending on whether the row meets the conditions or not.
java.util.List	canonizeCOD() Canonize the expression into a Conjunction of Disjunctions form.
java.util.List	canonizeDOC() Canonize the expression into a Disjunction of Conjunctions form.

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryExp

public QueryExp()

Constructor.

Method Detail

apply

public boolean apply(CIMElement obj)
              throws CIMException

When a 'row' is applied to this method it returns true or false depending on whether the row meets the conditions or not.

Parameters:

obj - The 'row' which is being applied. The row in the case of WQL can be any CIMElement. Currently the only valid CIMElement is CIMInstance.

Returns:

boolean true if the 'row' meets the conditions, 'false' otherwise In the case of QueryExp it is always true.

See Also:

CIMInstance

canonizeDOC

public java.util.List canonizeDOC()

Canonize the expression into a Disjunction of Conjunctions form. (OR of ANDed comparison expressions). This enables handling of the expression as a List of Lists rather than a tree form, enabling ease of evaluation.

Returns:

a List of Lists. The sub-lists each contain comparison expressions (presently BinaryRelQueryExp) and represent the logical AND of these expressions. The parent List represents the logical OR of each of its sub-lists.

canonizeCOD

public java.util.List canonizeCOD()

Canonize the expression into a Conjunction of Disjunctions form. (AND of ORed comparison expressions). This enables handling of the expression as a List of Lists rather than a tree form, enabling ease of evaluation.

Returns:

a List of Lists. The sub-lists each contain comparison expressions (presently BinaryRelQueryExp) and represent the logical OR of these expressions. The parent List represents the logical AND of each of its sub-lists.