org.apache.openjpa.persistence.query
Interface Expression

All Superinterfaces:
OrderByItem, PredicateOperand, SelectItem
All Known Subinterfaces:
Aggregate, DomainObject, PathExpression
All Known Implementing Classes:
AbsExpression, AbstractDomainObject, AbstractPath, AllExpression, AnyExpression, ArrayExpression, AverageExpression, BinaryOperatorExpression, ConcatExpression, ConstantExpression, CountExpression, CurrentTimeExpression, DistinctExpression, DividedByExpression, ElseExpression, EntryExpression, ExpressionImpl, FetchPath, IndexExpression, JoinPath, KeyExpression, LengthExpression, LiteralExpression, LocateExpression, LowerExpression, MaxExpression, MinExpression, MinusExpression, ModExpression, NavigationPath, OperatorPath, ParameterExpression, PlusExpression, QueryDefinitionImpl, QueryExpression, RangeExpression, RootPath, SizeExpression, SomeExpression, SquareRootExpression, SubStringExpression, SumExpression, TimesExpression, TrimExpression, TypeExpression, UnaryMinusExpression, UnaryOperatorExpression, UpperExpression, ValueExpression, VarArgsExpression

public interface Expression
extends SelectItem, PredicateOperand

Instances of this interface can be used either as select list items or as predicate operands.


Method Summary
 Expression abs()
          Absolute value.
 Expression concat(Expression... str)
          Concatenate a string with other string(s).
 Expression concat(String... str)
          Concatenate a string with other string(s).
 Expression dividedBy(Expression expr)
          Division.
 Expression dividedBy(Number num)
          Division.
 Predicate in(Class... classes)
          Create a predicate for testing whether the expression value is a member of the argument list.
 Predicate in(Enum<?>... enums)
          Create a predicate for testing whether the expression value is a member of the argument list.
 Predicate in(Expression... params)
          Create a predicate for testing whether the expression value is a member of the argument list.
 Predicate in(Number... nums)
          Create a predicate for testing whether the expression value is a member of the argument list.
 Predicate in(String... strings)
          Create a predicate for testing whether the expression value is a member of the argument list.
 Predicate in(Subquery subquery)
          Create a predicate for testing whether the expression value is a member of a subquery result.
 Predicate isNull()
          Create a predicate for testing whether the value of the expression is null.
 Expression length()
          String length This method must be invoked on an expression corresponding to a string.
 Expression locate(Expression str)
          Locate a string contained within the string corresponding to the expression on which the method was invoked.
 Expression locate(Expression str, Expression position)
          Locate a string contained within the string corresponding to the expression on which the method was invoked, starting at a specified search position.
 Expression locate(Expression str, int position)
          Locate a string contained within the string corresponding to the expression on which the method was invoked, starting at a specified search position.
 Expression locate(String str)
          Locate a string contained within the string corresponding to the expression on which the method was invoked.
 Expression locate(String str, Expression position)
          Locate a string contained within the string corresponding to the expression on which the method was invoked, starting at a specified search position.
 Expression locate(String str, int position)
          Locate a string contained within the string corresponding to the expression on which the method was invoked, starting at a specified search position.
 Expression lower()
          Convert string to lowercase.
 Predicate member(PathExpression arg)
          Create a predicate for testing whether the expression is a member of the association or element collection denoted by the path expression.
 Expression minus()
          Unary minus.
 Expression minus(Expression expr)
          Subtraction.
 Expression minus(Number num)
          Subtraction.
 Expression mod(Expression expr)
          Modulo operation.
 Expression mod(int num)
          Modulo operation.
 Expression plus(Expression expr)
          Addition.
 Expression plus(Number num)
          Addition.
 Expression sqrt()
          Square root.
 Expression substring(Expression start)
          Extract a substring starting at specified position through to the end of the string.
 Expression substring(Expression start, Expression len)
          Extract a substring.
 Expression substring(Expression start, int len)
          Extract a substring.
 Expression substring(int start)
          Extract a substring starting at specified position through to the end of the string.
 Expression substring(int start, Expression len)
          Extract a substring.
 Expression substring(int start, int len)
          Extract a substring.
 Expression times(Expression expr)
          Multiplication.
 Expression times(Number num)
          Multiplication.
 Expression trim()
          Trim leading and trailing blanks.
 Expression trim(char c)
          Trim leading and trailing occurrences of character from the string.
 Expression trim(char c, TrimSpec spec)
          Trim occurrences of the character from leading or trailing (or both) positions of the string, as specified by trim spec.
 Expression trim(Expression expr)
          Trim leading and trailing occurrences of character specified by the expression argument from the string.
 Expression trim(Expression expr, TrimSpec spec)
          Trim occurrences of the character specified by the expression argument from leading or trailing (or both) positions of the string, as specified by trim spec.
 Expression trim(TrimSpec spec)
          Trim leading, trailing blanks (or both) as specified by trim spec.
 Expression upper()
          Convert string to uppercase.
 
Methods inherited from interface org.apache.openjpa.persistence.query.SelectItem
asc, desc
 
Methods inherited from interface org.apache.openjpa.persistence.query.PredicateOperand
between, between, between, between, between, between, between, between, between, between, between, between, between, equal, equal, equal, equal, equal, equal, equal, equal, greaterEqual, greaterEqual, greaterEqual, greaterEqual, greaterEqual, greaterThan, greaterThan, greaterThan, greaterThan, greaterThan, lessEqual, lessEqual, lessEqual, lessEqual, lessEqual, lessThan, lessThan, lessThan, lessThan, lessThan, like, like, like, like, like, like, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual
 

Method Detail

member

Predicate member(PathExpression arg)
Create a predicate for testing whether the expression is a member of the association or element collection denoted by the path expression. The argument must correspond to a collection-valued association or element collection of like type.

Parameters:
arg - - a path expression that specifies a collection-valued association or an element collection
Returns:
conditional predicate

isNull

Predicate isNull()
Create a predicate for testing whether the value of the expression is null.

Returns:
conditional predicate

in

Predicate in(String... strings)
Create a predicate for testing whether the expression value is a member of the argument list.

Parameters:
strings -
Returns:
conditional predicate

in

Predicate in(Number... nums)
Create a predicate for testing whether the expression value is a member of the argument list.

Parameters:
nums -
Returns:
conditional predicate

in

Predicate in(Enum<?>... enums)
Create a predicate for testing whether the expression value is a member of the argument list.

Parameters:
enums -
Returns:
conditional predicate

in

Predicate in(Class... classes)
Create a predicate for testing whether the expression value is a member of the argument list.

Parameters:
classes -
Returns:
conditional predicate

in

Predicate in(Expression... params)
Create a predicate for testing whether the expression value is a member of the argument list.

Parameters:
params -
Returns:
conditional predicate

in

Predicate in(Subquery subquery)
Create a predicate for testing whether the expression value is a member of a subquery result.

Parameters:
subquery -
Returns:
conditional predicate

length

Expression length()
String length This method must be invoked on an expression corresponding to a string.

Returns:
expression denoting the length of the string.

concat

Expression concat(String... str)
Concatenate a string with other string(s). This method must be invoked on an expression corresponding to a string.

Parameters:
str - - string(s)
Returns:
expression denoting the concatenation of the strings, starting with the string corresponding to the expression on which the method was invoked.

concat

Expression concat(Expression... str)
Concatenate a string with other string(s). This method must be invoked on an expression corresponding to a string.

Parameters:
str - - expression(s) corresponding to string(s)
Returns:
expression denoting the concatenation of the strings, starting with the string corresponding to the expression on which the method was invoked.

substring

Expression substring(int start)
Extract a substring starting at specified position through to the end of the string. This method must be invoked on an expression corresponding to a string.

Parameters:
start - - start position (1 indicates first position)
Returns:
expression denoting the extracted substring

substring

Expression substring(Expression start)
Extract a substring starting at specified position through to the end of the string. This method must be invoked on an expression corresponding to a string.

Parameters:
start - - expression denoting start position (1 indicates first position)
Returns:
expression denoting the extracted substring

substring

Expression substring(int start,
                     int len)
Extract a substring. This method must be invoked on an expression corresponding to a string.

Parameters:
start - - start position (1 indicates first position)
len - - length of the substring to be returned
Returns:
expression denoting the extracted substring

substring

Expression substring(int start,
                     Expression len)
Extract a substring. This method must be invoked on an expression corresponding to a string.

Parameters:
start - - start position (1 indicates first position)
len - - expression denoting length of the substring to return
Returns:
expression denoting the extracted substring

substring

Expression substring(Expression start,
                     int len)
Extract a substring. This method must be invoked on an expression corresponding to a string.

Parameters:
start - - expression denoting start position (1 indicates first position)
len - - length of the substring to return
Returns:
expression denoting the extracted substring

substring

Expression substring(Expression start,
                     Expression len)
Extract a substring. This method must be invoked on an expression corresponding to a string.

Parameters:
start - - expression denoting start position (1 indicates first position)
len - - expression denoting length of the substring to return
Returns:
expression denoting the extracted substring

lower

Expression lower()
Convert string to lowercase. This method must be invoked on an expression corresponding to a string.

Returns:
expression denoting the string in lowercase

upper

Expression upper()
Convert string to uppercase. This method must be invoked on an expression corresponding to a string.

Returns:
expression denoting the string in uppercase

trim

Expression trim()
Trim leading and trailing blanks. This method must be invoked on an expression corresponding to a string.

Returns:
expression denoting trimmed string

trim

Expression trim(TrimSpec spec)
Trim leading, trailing blanks (or both) as specified by trim spec. This method must be invoked on an expression corresponding to a string.

Parameters:
spec - - trim specification
Returns:
expression denoting trimmed string

trim

Expression trim(char c)
Trim leading and trailing occurrences of character from the string. This method must be invoked on an expression corresponding to a string.

Parameters:
c - - character to be trimmed
Returns:
expression denoting trimmed string

trim

Expression trim(char c,
                TrimSpec spec)
Trim occurrences of the character from leading or trailing (or both) positions of the string, as specified by trim spec. This method must be invoked on an expression corresponding to a string.

Parameters:
c - - character to be trimmed
spec - - trim specification
Returns:
expression denoting trimmed string

trim

Expression trim(Expression expr)
Trim leading and trailing occurrences of character specified by the expression argument from the string. This method must be invoked on an expression corresponding to a string.

Parameters:
expr - - expression corresponding to the character to be trimmed
Returns:
expression denoting trimmed string

trim

Expression trim(Expression expr,
                TrimSpec spec)
Trim occurrences of the character specified by the expression argument from leading or trailing (or both) positions of the string, as specified by trim spec. This method must be invoked on an expression corresponding to a string.

Parameters:
expr - - expression corresponding to the character to be trimmed
spec - - trim specification
Returns:
expression denoting trimmed string

locate

Expression locate(String str)
Locate a string contained within the string corresponding to the expression on which the method was invoked. The search is started at position 1 (first string position). This method must be invoked on an expression corresponding to a string.

Parameters:
str - - string to be located
Returns:
expression denoting the first position at which the string was found or expression denoting 0 if the string was not found

locate

Expression locate(Expression str)
Locate a string contained within the string corresponding to the expression on which the method was invoked. The search is started at position 1 (first string position). This method must be invoked on an expression corresponding to a string.

Parameters:
str - - expression corresponding to the string to be located
Returns:
expression denoting the first position at which the string was found or expression denoting 0 if the string was not found

locate

Expression locate(String str,
                  int position)
Locate a string contained within the string corresponding to the expression on which the method was invoked, starting at a specified search position. This method must be invoked on an expression corresponding to a string.

Parameters:
str - - string to be located
position - - position at which to start the search
Returns:
expression denoting the first position at which the string was found or expression denoting 0 if the string was not found

locate

Expression locate(String str,
                  Expression position)
Locate a string contained within the string corresponding to the expression on which the method was invoked, starting at a specified search position. This method must be invoked on an expression corresponding to a string.

Parameters:
str - - string to be located
position - - expression corresponding to position at which to start the search
Returns:
expression denoting the first position at which the string was found or expression denoting 0 if the string was not found

locate

Expression locate(Expression str,
                  int position)
Locate a string contained within the string corresponding to the expression on which the method was invoked, starting at a specified search position. This method must be invoked on an expression corresponding to a string.

Parameters:
str - - expression corresponding to the string to be located
position - - position at which to start the search
Returns:
expression denoting the first position at which the string was found or expression denoting 0 if the string was not found

locate

Expression locate(Expression str,
                  Expression position)
Locate a string contained within the string corresponding to the expression on which the method was invoked, starting at a specified search position. This method must be invoked on an expression corresponding to a string.

Parameters:
str - - expression corresponding to the string to be located
position - - expression corresponding to position at which to start the search
Returns:
expression denoting the first position at which the string was found or expression denoting 0 if the string was not found

plus

Expression plus(Number num)
Addition. This method must be invoked on an expression corresponding to a number.

Parameters:
num - - number to be added
Returns:
expression denoting the sum

plus

Expression plus(Expression expr)
Addition. This method must be invoked on an expression corresponding to a number.

Parameters:
expr - - expression corresponding to number to be added
Returns:
expression denoting the sum

minus

Expression minus()
Unary minus. This method must be invoked on an expression corresponding to a number.

Returns:
expression denoting the unary minus of the expression

minus

Expression minus(Number num)
Subtraction. This method must be invoked on an expression corresponding to a number.

Parameters:
num - - subtrahend
Returns:
expression denoting the result of subtracting the argument from the number corresponding to the expression on which the method was invoked.

minus

Expression minus(Expression expr)
Subtraction. This method must be invoked on an expression corresponding to a number.

Parameters:
expr - - expression corresponding to subtrahend
Returns:
expression denoting the result of subtracting the number denoted by the argument from the number corresponding to the expression on which the method was invoked.

dividedBy

Expression dividedBy(Number num)
Division. This method must be invoked on an expression corresponding to a number.

Parameters:
num - - divisor
Returns:
expression denoting the result of dividing the number corresponding to the expression on which the method was invoked by the argument

dividedBy

Expression dividedBy(Expression expr)
Division. This method must be invoked on an expression corresponding to a number.

Parameters:
expr - - expression corresponding to the divisor
Returns:
expression denoting the result of dividing the number corresponding to the expression on which the method was invoked by the number denoted by the argument

times

Expression times(Number num)
Multiplication. This method must be invoked on an expression corresponding to a number.

Parameters:
num - - multiplier
Returns:
expression denoting the result of multiplying the argument with the number corresponding to the expression on which the method was invoked.

times

Expression times(Expression expr)
Multiplication. This method must be invoked on an expression corresponding to a number.

Parameters:
expr - - expression corresponding to the multiplier
Returns:
expression denoting the result of multiplying the number denoted by the argument with the number corresponding to the expression on which the method was invoked.

abs

Expression abs()
Absolute value. This method must be invoked on an expression corresponding to a number.

Returns:
expression corresponding to the absolute value

sqrt

Expression sqrt()
Square root. This method must be invoked on an expression corresponding to a number.

Returns:
expression corresponding to the square root

mod

Expression mod(int num)
Modulo operation. This must be invoked on an expression corresponding to an integer value

Parameters:
num - - integer divisor
Returns:
expression corresponding to the integer remainder of the division of the integer corresponding to the expression on which the method was invoked by the argument.

mod

Expression mod(Expression expr)
Modulo operation. This must be invoked on an expression corresponding to an integer value

Parameters:
expr - - expression corresponding to integer divisor
Returns:
expression corresponding to the integer remainder of the division of the integer corresponding to the expression on which the method was invoked by the argument.


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