ExpressionImpl (DataNucleus JDO API plugin 5.2.5-SNAPSHOT API)

java.lang.Object
- org.datanucleus.api.jdo.query.ExpressionImpl<T>

All Implemented Interfaces:

javax.jdo.query.Expression<T>

Direct Known Subclasses:

CollectionExpressionImpl, ComparableExpressionImpl, MapExpressionImpl, ObjectExpressionImpl, PersistableExpressionImpl
```
public class ExpressionImpl<T>
extends Object
implements javax.jdo.query.Expression<T>
```
Implementation of the methods for Expression, to be extended by the XXXExpressionImpl classes.

Field Summary

Fields
Modifier and Type	Field and Description
`protected ExpressionType`	`exprType` Type of this expression.
`protected org.datanucleus.query.expression.Expression`	`queryExpr` The generic query expression that represents this typesafe expression.

Constructor Summary

Constructors
Constructor and Description
`ExpressionImpl(Class cls, String name, ExpressionType type)` Constructor for a parameter or variable of this type.
`ExpressionImpl(org.datanucleus.query.expression.Expression queryExpr)` Constructor taking in the query expression being represented.
`ExpressionImpl(javax.jdo.query.PersistableExpression parent, String name)` Constructor, extending a parent, and accessing a member of that parent.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`javax.jdo.query.Expression<T>`	`as(String alias)`
`javax.jdo.query.Expression`	`cast(Class cls)`
`javax.jdo.query.NumericExpression<Long>`	`count()`
`javax.jdo.query.NumericExpression<Long>`	`countDistinct()`
`javax.jdo.query.BooleanExpression`	`eq(javax.jdo.query.Expression expr)`
`javax.jdo.query.BooleanExpression`	`eq(T t)`
`org.datanucleus.query.expression.Expression`	`getQueryExpression()` Accessor for the underlying (generic) query expression.
`javax.jdo.query.BooleanExpression`	`instanceOf(Class cls)`
`boolean`	`isParameter()`
`boolean`	`isVariable()`
`javax.jdo.query.BooleanExpression`	`ne(javax.jdo.query.Expression expr)`
`javax.jdo.query.BooleanExpression`	`ne(T t)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - queryExpr
```
protected org.datanucleus.query.expression.Expression queryExpr
```
    The generic query expression that represents this typesafe expression.
  - exprType
```
protected ExpressionType exprType
```
    Type of this expression.
- Constructor Detail
  - ExpressionImpl
```
public ExpressionImpl(javax.jdo.query.PersistableExpression parent,
                      String name)
```
    Constructor, extending a parent, and accessing a member of that parent.
    
    Parameters:
    
    parent - The parent expression (or null, if candidate)
    
    name - Name of the member to access
  - ExpressionImpl
```
public ExpressionImpl(Class cls,
                      String name,
                      ExpressionType type)
```
    Constructor for a parameter or variable of this type.
    
    Parameters:
    
    cls - The type of the parameter/variable
    
    name - Name of the member to access
    
    type - The type, whether parameter or variable
  - ExpressionImpl
```
public ExpressionImpl(org.datanucleus.query.expression.Expression queryExpr)
```
    Constructor taking in the query expression being represented.
    
    Parameters:
    
    queryExpr - The (generic) query expression
- Method Detail
  - as
```
public javax.jdo.query.Expression<T> as(String alias)
```
    Specified by:
    
    as in interface javax.jdo.query.Expression<T>
  - getQueryExpression
```
public org.datanucleus.query.expression.Expression getQueryExpression()
```
    Accessor for the underlying (generic) query expression.
    
    Returns:
    
    The query expression
  - isParameter
```
public boolean isParameter()
```
  - isVariable
```
public boolean isVariable()
```
  - eq
```
public javax.jdo.query.BooleanExpression eq(javax.jdo.query.Expression expr)
```
    Specified by:
    
    eq in interface javax.jdo.query.Expression<T>
  - eq
```
public javax.jdo.query.BooleanExpression eq(T t)
```
    Specified by:
    
    eq in interface javax.jdo.query.Expression<T>
  - ne
```
public javax.jdo.query.BooleanExpression ne(javax.jdo.query.Expression expr)
```
    Specified by:
    
    ne in interface javax.jdo.query.Expression<T>
  - ne
```
public javax.jdo.query.BooleanExpression ne(T t)
```
    Specified by:
    
    ne in interface javax.jdo.query.Expression<T>
  - instanceOf
```
public javax.jdo.query.BooleanExpression instanceOf(Class cls)
```
    Specified by:
    
    instanceOf in interface javax.jdo.query.Expression<T>
  - cast
```
public javax.jdo.query.Expression cast(Class cls)
```
    Specified by:
    
    cast in interface javax.jdo.query.Expression<T>
  - count
```
public javax.jdo.query.NumericExpression<Long> count()
```
    Specified by:
    
    count in interface javax.jdo.query.Expression<T>
  - countDistinct
```
public javax.jdo.query.NumericExpression<Long> countDistinct()
```
    Specified by:
    
    countDistinct in interface javax.jdo.query.Expression<T>

Class ExpressionImpl<T>

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

queryExpr

exprType

Constructor Detail

ExpressionImpl

ExpressionImpl

ExpressionImpl

Method Detail

as

getQueryExpression

isParameter

isVariable

eq

eq

ne

ne

instanceOf

cast

count

countDistinct