net.ontopia.persistence.query.sql
Class SQLFunction

java.lang.Object
  net.ontopia.persistence.query.sql.SQLFunction

All Implemented Interfaces:

SQLValueIF

public class SQLFunction
extends Object
implements SQLValueIF

INTERNAL: SQL condition: any function; fn(arg1, ... argN)

Field Summary

protected String	alias
protected SQLValueIF[]	args
protected static FieldHandlerIF	DEFAULT_FIELD_HANDLER
protected static Class	DEFAULT_VALUE_TYPE
protected FieldHandlerIF	fhandler
protected String	name
protected Class	vtype

Fields inherited from interface net.ontopia.persistence.query.sql.SQLValueIF

COLUMNS, FUNCTION, NULL, PARAMETER, PRIMITIVE, TUPLE, VERBATIM

Constructor Summary

SQLFunction(String name, SQLValueIF[] args)

Method Summary

String	getAlias() INTERNAL: The column alias to use if this value is included in the projection.
SQLValueIF[]	getArguments()
int	getArity() INTERNAL: Returns the [column] arity of the value.
FieldHandlerIF	getFieldHandler() INTERNAL: Returns the field handler for the columns.
String	getName()
SQLValueIF	getReference() INTERNAL: Returns the referenced value if one exists.
int	getType() INTERNAL: Returns the value class type.
int	getValueArity() INTERNAL: Returns the value arity of the value.
Class	getValueType() INTERNAL: Returns the value type.
boolean	isReference() INTERNAL: Returns true if this value is a reference to another.
void	setAlias(String alias) INTERNAL: Sets the column alias.
void	setArguments(SQLValueIF[] args)
void	setFieldHandler(FieldHandlerIF fhandler) INTERNAL: Sets the field handler for the value.
void	setValueType(Class vtype) INTERNAL: Sets the value type.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_VALUE_TYPE

protected static final Class DEFAULT_VALUE_TYPE

DEFAULT_FIELD_HANDLER

protected static final FieldHandlerIF DEFAULT_FIELD_HANDLER

name

protected String name

args

protected SQLValueIF[] args

alias

protected String alias

vtype

protected Class vtype

fhandler

protected FieldHandlerIF fhandler

Constructor Detail

SQLFunction

public SQLFunction(String name,
                   SQLValueIF[] args)

Method Detail

getType

public int getType()

Description copied from interface: SQLValueIF

INTERNAL: Returns the value class type. The type is represented by one of the constants in the SQLValueIF interface.

Specified by:

getType in interface SQLValueIF

getName

public String getName()

getArguments

public SQLValueIF[] getArguments()

setArguments

public void setArguments(SQLValueIF[] args)

getArity

public int getArity()

Description copied from interface: SQLValueIF

INTERNAL: Returns the [column] arity of the value. The number represents the number of "columns" the value spans, i.e. its composite width.

Specified by:

getArity in interface SQLValueIF

getValueArity

public int getValueArity()

Description copied from interface: SQLValueIF

INTERNAL: Returns the value arity of the value. This number refers to the number of nested values this value contains including itself. Most values therefore have a value arity of 1. Nested values may have an arity higher than 1. SQLTuple is currently the only nested value type.

Specified by:

getValueArity in interface SQLValueIF

getAlias

public String getAlias()

Description copied from interface: SQLValueIF

INTERNAL: The column alias to use if this value is included in the projection. The SQL select syntax is typically like "select value as from foo".

Specified by:

getAlias in interface SQLValueIF

setAlias

public void setAlias(String alias)

Description copied from interface: SQLValueIF

INTERNAL: Sets the column alias.

Specified by:

setAlias in interface SQLValueIF

isReference

public boolean isReference()

Description copied from interface: SQLValueIF

INTERNAL: Returns true if this value is a reference to another.

Specified by:

isReference in interface SQLValueIF

getReference

public SQLValueIF getReference()

Description copied from interface: SQLValueIF

INTERNAL: Returns the referenced value if one exists.

Specified by:

getReference in interface SQLValueIF

getValueType

public Class getValueType()

Description copied from interface: SQLValueIF

INTERNAL: Returns the value type.

Specified by:

getValueType in interface SQLValueIF

setValueType

public void setValueType(Class vtype)

Description copied from interface: SQLValueIF

INTERNAL: Sets the value type.

Specified by:

setValueType in interface SQLValueIF

getFieldHandler

public FieldHandlerIF getFieldHandler()

Description copied from interface: SQLValueIF

INTERNAL: Returns the field handler for the columns.

Specified by:

getFieldHandler in interface SQLValueIF

setFieldHandler

public void setFieldHandler(FieldHandlerIF fhandler)

Description copied from interface: SQLValueIF

INTERNAL: Sets the field handler for the value.

Specified by:

setFieldHandler in interface SQLValueIF

toString

public String toString()

Overrides:

toString in class Object