Value (OpenJPA Parent POM 4.0.0 API)

All Superinterfaces:

java.io.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, NullableAggregateUnaryOp, NullIf, NullIfExpression, Param, PCPath, SimpleCase, SimpleCaseExpression, Sqrt, StringLength, SubQ, Substring, ToLowerCase, ToUpperCase, Trim, TypeLit, Val
```
public interface Value
extends java.io.Serializable
```
Interface for any non-operator in a query filter, including constants, variables, and object fields.

Author:

Abe White

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`acceptVisit(ExpressionVisitor visitor)`	Accept a visit from a tree visitor.
`java.lang.String`	`getAlias()`	Return select item alias
`ClassMetaData`	`getMetaData()`	Return any associated persistent type.
`java.lang.String`	`getName()`
`Path`	`getPath()`
`Value`	`getSelectAs()`	Return 'this' concrete class if alias is set, otherwise null
`java.lang.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(java.lang.String alias)`	Set select item alias
`void`	`setImplicitType(java.lang.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
```
java.lang.Class getType()
```
    Return the expected type for this value, or Object if the type is unknown.
  - setImplicitType
```
void setImplicitType(java.lang.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
```
java.lang.String getAlias()
```
    Return select item alias
  - setAlias
```
void setAlias(java.lang.String alias)
```
    Set select item alias
  - getSelectAs
```
Value getSelectAs()
```
    Return 'this' concrete class if alias is set, otherwise null
  - getPath
```
Path getPath()
```
  - getName
```
java.lang.String getName()
```