Apache Derby Database Engine and Embedded JDBC Driver 10.17.1.0 · org.apache.derby.impl.sql.compile.UserAggregateDefinition

Field Summary

Access	Constructor and Description
public	UserAggregateDefinition(AliasDescriptor alias) Conjure out of thin air.

Modifier and Type	Method and Description
private StandardException	aggregatorInstantiation(Throwable t) Make a "Could not instantiate aggregator" exception.
pack-priv final ValueNode	castInputValue(ValueNode inputValue, ContextManager cm) Wrap the input operand in an implicit CAST node as necessary in order to coerce it the correct type for the aggregator.
public final DataTypeDescriptor	Returns: the result type of the user-defined aggregator getAggregator(DataTypeDescriptor the input type inputType, StringBuffer (Output arg) the name of the Derby execution-time class which wraps the aggregate logic aggregatorClass) Implements org.apache.derby.impl.sql.compile.AggregateDefinition.getAggregator. Determines the result datatype and verifies that the input datatype is correct.
public AliasDescriptor	getAliasDescriptor() Get the wrapped alias descriptor
private Class<?>	getJavaClass(ClassFactory classFactory, DataTypeDescriptor dtd) Get the Java class corresponding to a Derby datatype.
private void	vetCompatibility(Class<?> actualClass, Class<?> expectedClass, String sqlState) Verify that an actual type is compatible with the expected type.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

_alias	back to summary
private AliasDescriptor _alias

AGGREGATOR_PARAM_COUNT	back to summary
private static final int AGGREGATOR_PARAM_COUNT

AGGREGATOR_TYPE	back to summary
private static final int AGGREGATOR_TYPE

DERBY_BYTE_ARRAY_NAME	back to summary
private static final String DERBY_BYTE_ARRAY_NAME

INPUT_TYPE	back to summary
private static final int INPUT_TYPE

RETURN_TYPE	back to summary
private static final int RETURN_TYPE

UserAggregateDefinition	back to summary
public UserAggregateDefinition(AliasDescriptor alias) Conjure out of thin air.

aggregatorInstantiation	back to summary
private StandardException aggregatorInstantiation(Throwable t) Make a "Could not instantiate aggregator" exception.

castInputValue	back to summary
pack-priv final ValueNode castInputValue(ValueNode inputValue, ContextManager cm) throws StandardException Wrap the input operand in an implicit CAST node as necessary in order to coerce it the correct type for the aggregator. Return null if no cast is necessary.

getAggregator	back to summary
public final DataTypeDescriptor getAggregator(DataTypeDescriptor inputType, StringBuffer aggregatorClass) throws StandardException Implements org.apache.derby.impl.sql.compile.AggregateDefinition.getAggregator. Determines the result datatype and verifies that the input datatype is correct. Parameters inputType:DataTypeDescriptor the input type aggregatorClass:StringBuffer (Output arg) the name of the Derby execution-time class which wraps the aggregate logic Returns:DataTypeDescriptor the result type of the user-defined aggregator

getAggregator

public final DataTypeDescriptor getAggregator(DataTypeDescriptor inputType, StringBuffer aggregatorClass) throws StandardException

Determines the result datatype and verifies that the input datatype is correct.

Parameters

inputType:DataTypeDescriptor: the input type
aggregatorClass:StringBuffer: (Output arg) the name of the Derby execution-time class which wraps the aggregate logic

the result type of the user-defined aggregator

getAliasDescriptor	back to summary
public AliasDescriptor getAliasDescriptor() Get the wrapped alias descriptor

getJavaClass	back to summary
private Class<?> getJavaClass(ClassFactory classFactory, DataTypeDescriptor dtd) throws StandardException, ClassNotFoundException Get the Java class corresponding to a Derby datatype.

vetCompatibility	back to summary
private void vetCompatibility(Class<?> actualClass, Class<?> expectedClass, String sqlState) throws StandardException Verify that an actual type is compatible with the expected type.