com.mobixess.jodb.core.query
Class QueryNode

java.lang.Object
  com.mobixess.jodb.core.query.QueryNode

All Implemented Interfaces:

Query

public class QueryNode
extends java.lang.Object
implements Query

Constructor Summary

QueryNode(java.lang.Object pattern, java.util.Collection defaultIgnoreValues, JODBSession session, QueryNode masterNode)

QueryNode(java.lang.String name, JODBSession session, QueryNode masterNode)

Method Summary

Constraint	constrain(java.lang.Object constraint) adds a constraint to this node.
Constraints	constraints() returns a Constraints object that holds an array of all constraints on this node.
Query	descend(java.lang.String fieldName) returns a reference to a descendant node in the query graph.
ObjectSet	execute() executes the Query.
com.mobixess.jodb.core.query.QueryNode.CONSTRAINT_EVALUATION_STATUS	getCumulativeStatus()
int	getNextMasterNodeSortCounter()
void	initSortDataCache(SortDataCache sortDataCache, java.lang.StringBuffer path)
void	markAsUnreachable()
Query	orderAscending() adds an ascending ordering criteria to this node of the query graph.
Query	orderDescending() adds a descending order criteria to this node of the query graph.
void	refillSortData(long objectID, SortDataCache sortDataCache, JODBOperationContext context)
void	resetStateOfConstraints()

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryNode

public QueryNode(java.lang.String name,
                 JODBSession session,
                 QueryNode masterNode)

QueryNode

public QueryNode(java.lang.Object pattern,
                 java.util.Collection defaultIgnoreValues,
                 JODBSession session,
                 QueryNode masterNode)

Method Detail

constrain

public Constraint constrain(java.lang.Object constraint)

Description copied from interface: Query

adds a constraint to this node.

If the constraint contains attributes that are not yet present in the query graph, the query graph is extended accordingly.

Special behaviour for:

• class Class: confine the result to objects of one class (if the Class object represents a class) or to objects implementing a specific interface (if the Class object represents an interface).
• interface Evaluation: run evaluation callbacks against all candidates.

Specified by:

constrain in interface Query

Parameters:

constraint - the constraint to be added to this Query.

Returns:

Constraint a new Constraint for this query node or null for objects implementing the Evaluation interface.

constraints

public Constraints constraints()

Description copied from interface: Query

returns a Constraints object that holds an array of all constraints on this node.

Specified by:

constraints in interface Query

Returns:

Constraints on this query node.

descend

public Query descend(java.lang.String fieldName)

Description copied from interface: Query

returns a reference to a descendant node in the query graph.

If the node does not exist, it will be created.

All classes represented in the query node are tested, whether they contain a field with the specified field name. The descendant Query node will be created from all possible candidate classes.

Specified by:

descend in interface Query

Returns:

descendant Query node

getNextMasterNodeSortCounter

public int getNextMasterNodeSortCounter()

execute

public ObjectSet execute()
                  throws java.io.IOException,
                         IllegalClassTypeException

Description copied from interface: Query

executes the Query.

Specified by:

execute in interface Query

Returns:

ObjectSet - the result of the Query.

Throws:

java.io.IOException

IllegalClassTypeException

getCumulativeStatus

public com.mobixess.jodb.core.query.QueryNode.CONSTRAINT_EVALUATION_STATUS getCumulativeStatus()

markAsUnreachable

public void markAsUnreachable()

orderAscending

public Query orderAscending()

Description copied from interface: Query

adds an ascending ordering criteria to this node of the query graph. Multiple ordering criteria will be applied in the order they were called.

Specified by:

orderAscending in interface Query

Returns:

this Query object to allow the chaining of method calls.

orderDescending

public Query orderDescending()

Description copied from interface: Query

adds a descending order criteria to this node of the query graph. Multiple ordering criteria will be applied in the order they were called.

Specified by:

orderDescending in interface Query

Returns:

this Query object to allow the chaining of method calls.

resetStateOfConstraints

public void resetStateOfConstraints()

refillSortData

public void refillSortData(long objectID,
                           SortDataCache sortDataCache,
                           JODBOperationContext context)
                    throws java.io.IOException

Throws:

java.io.IOException

initSortDataCache

public void initSortDataCache(SortDataCache sortDataCache,
                              java.lang.StringBuffer path)