net.esper.view
Class ViewCapPriorEventAccess

java.lang.Object
  extended by net.esper.view.ViewCapPriorEventAccess
All Implemented Interfaces:
ViewCapability

public class ViewCapPriorEventAccess
extends Object
implements ViewCapability

Describes that we need access to prior events (result events published by views), for use by the "prior" expression function.


Constructor Summary
ViewCapPriorEventAccess(Integer indexConstant)
          Ctor.
 
Method Summary
 Integer getIndexConstant()
          Index or the prior event we are asking for.
 boolean inspect(int streamNumber, List<ViewFactory> viewFactories, StatementContext statementContext)
          Inspect view factories returning false to indicate that view factories do not meet view resource requirements, or true to indicate view capability and view factories can be compatible.
 boolean requiresChildViews()
          Returns true to indicate that the capability requirs one or more child views, or can work without child views.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ViewCapPriorEventAccess

public ViewCapPriorEventAccess(Integer indexConstant)
Ctor.

Parameters:
indexConstant - is the index of the prior event, with zero being the current event.
Method Detail

getIndexConstant

public Integer getIndexConstant()
Index or the prior event we are asking for.

Returns:
prior event index constant

inspect

public boolean inspect(int streamNumber,
                       List<ViewFactory> viewFactories,
                       StatementContext statementContext)
Description copied from interface: ViewCapability
Inspect view factories returning false to indicate that view factories do not meet view resource requirements, or true to indicate view capability and view factories can be compatible.

Specified by:
inspect in interface ViewCapability
Parameters:
streamNumber - is the number of the stream
viewFactories - is a list of view factories that originate the final views
statementContext - is the statement-level services
Returns:
true to indicate inspection success, or false to indicate inspection failure

requiresChildViews

public boolean requiresChildViews()
Description copied from interface: ViewCapability
Returns true to indicate that the capability requirs one or more child views, or can work without child views.

Specified by:
requiresChildViews in interface ViewCapability
Returns:
true for child views required, false for not required

© 2007 EsperTech Inc.
All rights reserved.
Visit us at espertech.com