Package org.datanucleus.api.jdo.query

Class ExpressionImpl<T>

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	Description
protected ExpressionType	exprType	Type of this expression.
protected org.datanucleus.store.query.expression.Expression	queryExpr	The generic query expression that represents this typesafe expression.

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	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.store.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.store.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.store.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.store.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>