org.h2gis.api

Interface ScalarFunction

All Superinterfaces:

Function

All Known Implementing Classes:

DeterministicScalarFunction

public interface ScalarFunction
extends Function

Scalar function interface. Scalar function in H2 can be defined through CREATE ALIAS, but in an OSGi context the class java name is not sufficient. The full declaration of java name in H2 through osgi is BundleSymbolicName:BundleVersion:BinaryJavaName. Registering this interface as an OSGi service will add this function in H2GIS linked with a DataSource service.

Author:

Nicolas Fortin

Field Summary

Fields

Modifier and Type	Field and Description
static String	PROP_DETERMINISTIC Boolean, Deterministic functions must always return the same value for the same parameters.
static String	PROP_NOBUFFER Boolean, if nobuffer is true then this function will be called more often but will not cache the results in memory nor files

Fields inherited from interface org.h2gis.api.Function

PROP_NAME, PROP_REMARKS

Method Summary

Modifier and Type	Method and Description
String	getJavaStaticMethod() Returns Java name of static methods in this class to expose in database, theses methods are under the same alias but with different number of arguments.

Methods inherited from interface org.h2gis.api.Function

getProperty

Field Detail

PROP_DETERMINISTIC

static final String PROP_DETERMINISTIC

Boolean, Deterministic functions must always return the same value for the same parameters. The result of such functions is cached if possible.

See Also:

Constant Field Values

PROP_NOBUFFER

static final String PROP_NOBUFFER

Boolean, if nobuffer is true then this function will be called more often but will not cache the results in memory nor files

See Also:

Constant Field Values

Method Detail

getJavaStaticMethod

String getJavaStaticMethod()

Returns Java name of static methods in this class to expose in database, theses methods are under the same alias but with different number of arguments.

Returns:

The Java name of static methods or null if it has not be loaded