com.espertech.esper.client.hook

Class VirtualDataWindowLookupContext

java.lang.Object

com.espertech.esper.client.hook.VirtualDataWindowLookupContext

Direct Known Subclasses:

VirtualDataWindowLookupContextSPI

public class VirtualDataWindowLookupContext
extends Object

Context passed to VirtualDataWindow upon obtaining a lookup strategy for use by an EPL statement that queries the virtual data window.

Represents an analysis of correlation information provided in the where-clause of the querying EPL statement (join, subquery etc.). Hash-fields are always operator-equals semantics. Btree fields require sorted access as the operator is always a range or relational(>, <, >=, <=) operator.

For example, the query "select * from MyVirtualDataWindow, MyTrigger where prop = trigger and prop2 between trigger1 and trigger2" indicates a single hash-field "prop" and a single btree field "prop2" with a range operator.

Constructor Summary

Constructors

Constructor and Description
VirtualDataWindowLookupContext(String statementName, int statementId, Annotation[] statementAnnotations, boolean fireAndForget, String namedWindowName, List<VirtualDataWindowLookupFieldDesc> hashFields, List<VirtualDataWindowLookupFieldDesc> btreeFields) Ctor.

Method Summary

Modifier and Type	Method and Description
List<VirtualDataWindowLookupFieldDesc>	getBtreeFields() Returns the list of btree field descriptors.
List<VirtualDataWindowLookupFieldDesc>	getHashFields() Returns the list of hash field descriptors.
String	getNamedWindowName() Returns the named window name.
Annotation[]	getStatementAnnotations() Returns the statement annotations of the statement to be performing the lookup, or null for fire-and-forget statements.
int	getStatementId() Returns the statement id of the statement to be performing the lookup, or -1 for fire-and-forget statements.
String	getStatementName() Returns the statement name of the statement to be performing the lookup, or null for fire-and-forget statements.
boolean	isFireAndForget() Returns true for fire-and-forget queries.

Methods inherited from class java.lang.Object

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

Constructor Detail

VirtualDataWindowLookupContext

public VirtualDataWindowLookupContext(String statementName,
                                      int statementId,
                                      Annotation[] statementAnnotations,
                                      boolean fireAndForget,
                                      String namedWindowName,
                                      List<VirtualDataWindowLookupFieldDesc> hashFields,
                                      List<VirtualDataWindowLookupFieldDesc> btreeFields)

Ctor.

Parameters:

hashFields - operator-equals semantics fields

btreeFields - sorted-access fields, check the VirtualDataWindowLookupOp operator for what range or relational-operator applies

namedWindowName - named window name

statementName - the statement name of the statement performing the lookup; Null for fire-and-forget queries

statementAnnotations - the statement annotations of the statement performing the lookup; Null for fire-and-forget queries

fireAndForget - true for fire-and-forget queries

statementId - statement id

Method Detail

getNamedWindowName

public String getNamedWindowName()

Returns the named window name.

Returns:

named window name

getHashFields

public List<VirtualDataWindowLookupFieldDesc> getHashFields()

Returns the list of hash field descriptors.

Returns:

hash fields

getBtreeFields

public List<VirtualDataWindowLookupFieldDesc> getBtreeFields()

Returns the list of btree field descriptors.

Returns:

btree fields

getStatementName

public String getStatementName()

Returns the statement name of the statement to be performing the lookup, or null for fire-and-forget statements.

Returns:

statement name

getStatementId

public int getStatementId()

Returns the statement id of the statement to be performing the lookup, or -1 for fire-and-forget statements.

Returns:

statement name

getStatementAnnotations

public Annotation[] getStatementAnnotations()

Returns the statement annotations of the statement to be performing the lookup, or null for fire-and-forget statements.

Returns:

statement name

isFireAndForget

public boolean isFireAndForget()

Returns true for fire-and-forget queries.

Returns:

indicator whether fire-and-forget query