gov.nih.nci.cagrid.data.cql.cacore
Class SubclassCheckCache

java.lang.Object
  gov.nih.nci.cagrid.data.cql.cacore.SubclassCheckCache

public class SubclassCheckCache
extends java.lang.Object

SubclassCheckCache Checks that a given class has or does not have a class property in the caCORE backend data source. This property is only present for classes which have subclasses stored in the database as well.

Version:

$Id$

Author:

David W. Ervin

Field Summary

static java.lang.String	CABIO_URL
static java.lang.String	CLASS_PROPERTY_NOT_FOUND_ERROR

Constructor Summary

SubclassCheckCache()

Method Summary

static boolean

hasClassProperty(java.lang.String className, gov.nih.nci.system.applicationservice.ApplicationService queryService) Executes a test query against the application service to see if the specified type has a class discriminator parameter, which indicates that it has subclass instances available in the data source.

Methods inherited from class java.lang.Object

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

Field Detail

CABIO_URL

public static final java.lang.String CABIO_URL

See Also:

Constant Field Values

CLASS_PROPERTY_NOT_FOUND_ERROR

public static final java.lang.String CLASS_PROPERTY_NOT_FOUND_ERROR

See Also:

Constant Field Values

Constructor Detail

SubclassCheckCache

public SubclassCheckCache()

Method Detail

hasClassProperty

public static boolean hasClassProperty(java.lang.String className,
                                       gov.nih.nci.system.applicationservice.ApplicationService queryService)
                                throws QueryProcessingException

Executes a test query against the application service to see if the specified type has a class discriminator parameter, which indicates that it has subclass instances available in the data source. If an exception indicating the type has no class discriminator is thrown, this method returns false. If the query succedes, the method returns true. In this case, this is a somewhat expensive operation on the first call using that class name. All subsequent calls with the same class name are cached and return in order log(n) time, where n is the number of unique class names checked with this method.

Parameters:

className - The name of the class to test

queryService - The application service to submit the test query to

Returns:

True if the class discriminator is present, false otherwise

Throws:

QueryProcessingException