org.apache.openjpa.kernel.exps
Interface Value

All Superinterfaces:

Serializable

All Known Subinterfaces:

Arguments, Literal, Parameter, Path, Subquery, Val

All Known Implementing Classes:

Abs, Args, CandidatePath, Coalesce, CoalesceExpression, CollectionParam, Concat, DatastoreFunction, GeneralCaseExpression, IndexOf, Lit, MapEntry, MapKey, Math, Null, NullIf, NullIfExpression, Param, PCPath, SimpleCase, SimpleCaseExpression, Sqrt, StringLength, SubQ, Substring, ToLowerCase, ToUpperCase, Trim, TypeLit, Val

public interface Value
extends Serializable

Interface for any non-operator in a query filter, including constants, variables, and object fields.

Author:

Abe White

Method Summary

void	acceptVisit(ExpressionVisitor visitor) Accept a visit from a tree visitor.
String	getAlias() Return select item alias
ClassMetaData	getMetaData() Return any associated persistent type.
String	getName()
Path	getPath()
Value	getSelectAs() Return 'this' concrete class if alias is set, otherwise null
Class	getType() Return the expected type for this value, or Object if the type is unknown.
boolean	isAggregate() Return true if this value is an aggregate.
boolean	isVariable() Return true if this value is a variable.
boolean	isXPath() Return true if this value is an XML Path.
void	setAlias(String alias) Set select item alias
void	setImplicitType(Class type) Set the implicit type of the value, based on how it is used in the filter.
void	setMetaData(ClassMetaData meta) Associate a persistent type with this value.

Method Detail

getType

Class getType()

Return the expected type for this value, or Object if the type is unknown.

setImplicitType

void setImplicitType(Class type)

Set the implicit type of the value, based on how it is used in the filter. This method is only called on values who return Object from getType().

isVariable

boolean isVariable()

Return true if this value is a variable.

isAggregate

boolean isAggregate()

Return true if this value is an aggregate.

isXPath

boolean isXPath()

Return true if this value is an XML Path.

getMetaData

ClassMetaData getMetaData()

Return any associated persistent type.

setMetaData

void setMetaData(ClassMetaData meta)

Associate a persistent type with this value.

acceptVisit

void acceptVisit(ExpressionVisitor visitor)

Accept a visit from a tree visitor.

getAlias

String getAlias()

Return select item alias

setAlias

void setAlias(String alias)

Set select item alias

getSelectAs

Value getSelectAs()

Return 'this' concrete class if alias is set, otherwise null

getPath

Path getPath()

getName

String getName()