org.apache.openjpa.persistence.criteria
Class Expressions

java.lang.Object
  org.apache.openjpa.persistence.criteria.Expressions

 class Expressions
extends Object

Expressions according to JPA 2.0. A facade to OpenJPA kernel expressions to enforce stronger typing.

Since:

2.0.0

Author:

Pinaki Poddar, Fay Wang

Nested Class Summary

static class	Expressions.Abs<X>
static class	Expressions.All<X>
static class	Expressions.Any<X>
static class	Expressions.Avg
static class	Expressions.Between<Y extends Comparable<Y>>
static class	Expressions.BinarayFunctionalExpression<X> Binary Functional Expression applies a binary function on a pair of input Expression.
static class	Expressions.BinaryLogicalExpression Binary Logical Expression applies a function on a pair of input Expression to generate a Predicate i.e.
static class	Expressions.Case<T>
static class	Expressions.Cast<B>
static class	Expressions.CastAs<Y>
static class	Expressions.Coalesce<T>
static class	Expressions.Concat
static class	Expressions.Constant<X>
static class	Expressions.Count
static class	Expressions.CurrentDate
static class	Expressions.CurrentTime
static class	Expressions.CurrentTimestamp
static class	Expressions.DatabaseFunction<T>
static class	Expressions.Diff<N extends Number>
static class	Expressions.Equal
static class	Expressions.Exists<X>
static class	Expressions.FunctionalExpression<X> Functional Expression applies a function on a list of input Expressions.
static class	Expressions.GreaterThan
static class	Expressions.GreaterThanEqual
static class	Expressions.In<T>
static class	Expressions.Index
static class	Expressions.IsEmpty
static class	Expressions.IsMember<E>
static class	Expressions.IsNotEmpty
static class	Expressions.IsNotNull
static class	Expressions.IsNull
static class	Expressions.Length
static class	Expressions.LessThan
static class	Expressions.LessThanEqual
static class	Expressions.Like
static class	Expressions.ListArgument<T> An expression that is composed of one or more expressions.
static class	Expressions.Locate
static class	Expressions.Lower
static class	Expressions.Max<X>
static class	Expressions.Min<X>
static class	Expressions.Mod
static class	Expressions.Not
static class	Expressions.NotEqual
static class	Expressions.Nullif<T>
static class	Expressions.Product<N extends Number>
static class	Expressions.Quotient<N extends Number>
static class	Expressions.SimpleCase<C,R>
static class	Expressions.Size
static class	Expressions.Sqrt
static class	Expressions.SubqueryExpression<X>
static class	Expressions.SubqueryPredicate<X>
static class	Expressions.Substring
static class	Expressions.Sum<N extends Number>
static class	Expressions.Trim
static class	Expressions.Type<X extends Class>
static class	Expressions.UnaryFunctionalExpression<X> Unary Functional Expression applies a unary function on a input operand Expression.
static class	Expressions.Upper

Field Summary

(package private) static String	CLOSE_BRACE
(package private) static String	COMMA
(package private) static String	OPEN_BRACE

Constructor Summary

Expressions()

Method Summary

(package private) static void	acceptVisit(CriteriaExpressionVisitor visitor, CriteriaExpression parent, Expression<?>... exprs) Visits the given expression and the given children recursively.
(package private) static Expression	and(ExpressionFactory factory, Expression e1, Expression e2)
(package private) static StringBuilder	asValue(AliasContext q, Expression<?>[] exps, String connector) Renders the given expressions as a list of values separated by the given connector.
(package private) static StringBuilder	asValue(AliasContext q, Object... params) Renders the given arguments as a list of values separated by the given connector.
(package private) static <X> List<X>	returnCopy(List<X> list) Return a list that is either empty (if the given list is null) or a list whose mutation do not impact the original list.
(package private) static <X> Set<X>	returnCopy(Set<X> set) Return a set that is either empty (if the given set is null) or a set whose mutation do not impact the original list.
(package private) static void	setImplicitTypes(Value v1, Value v2, Class<?> expected, CriteriaQueryImpl<?> q)
(package private) static Value	toValue(ExpressionImpl<?> e, ExpressionFactory factory, CriteriaQueryImpl<?> q) Convert the given Criteria expression to a corresponding kernel value using the given ExpressionFactory.
(package private) static void	visitChildren(CriteriaExpressionVisitor visitor, Expression<?>... exprs)

Methods inherited from class java.lang.Object

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

Field Detail

OPEN_BRACE

static final String OPEN_BRACE

See Also:

Constant Field Values

CLOSE_BRACE

static final String CLOSE_BRACE

See Also:

Constant Field Values

COMMA

static final String COMMA

See Also:

Constant Field Values

Constructor Detail

Expressions

Expressions()

Method Detail

toValue

static Value toValue(ExpressionImpl<?> e,
                     ExpressionFactory factory,
                     CriteriaQueryImpl<?> q)

Convert the given Criteria expression to a corresponding kernel value using the given ExpressionFactory. Handles null expression.

setImplicitTypes

static void setImplicitTypes(Value v1,
                             Value v2,
                             Class<?> expected,
                             CriteriaQueryImpl<?> q)

acceptVisit

static void acceptVisit(CriteriaExpressionVisitor visitor,
                        CriteriaExpression parent,
                        Expression<?>... exprs)

Visits the given expression and the given children recursively. The order of traversal depends on the parent and is determined by the visitor.

visitChildren

static void visitChildren(CriteriaExpressionVisitor visitor,
                          Expression<?>... exprs)

asValue

static StringBuilder asValue(AliasContext q,
                             Expression<?>[] exps,
                             String connector)

Renders the given expressions as a list of values separated by the given connector.

asValue

static StringBuilder asValue(AliasContext q,
                             Object... params)

Renders the given arguments as a list of values separated by the given connector.

returnCopy

static <X> List<X> returnCopy(List<X> list)

Return a list that is either empty (if the given list is null) or a list whose mutation do not impact the original list.

returnCopy

static <X> Set<X> returnCopy(Set<X> set)

Return a set that is either empty (if the given set is null) or a set whose mutation do not impact the original list.

and

static Expression and(ExpressionFactory factory,
                      Expression e1,
                      Expression e2)