org.apache.openjpa.persistence.criteria
Class Expressions

java.lang.Object
  extended by 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)


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