org.apache.openjpa.persistence.query
Interface Expression

All Superinterfaces:

OrderByItem, PredicateOperand, SelectItem

All Known Subinterfaces:

Aggregate, DomainObject, PathExpression

All Known Implementing Classes:

AbsExpression, AbstractDomainObject, ArrayExpression, AverageExpression, BinaryOperatorExpression, ConcatExpression, CountExpression, CurrentTimeExpression, DistinctExpression, DividedByExpression, ElseExpression, EntryExpression, FetchPath, IndexExpression, JoinPath, KeyExpression, LengthExpression, LiteralExpression, LocateExpression, LowerExpression, MaxExpression, MinExpression, MinusExpression, OperatorPath, ParameterExpression, PlusExpression, QueryDefinitionImpl, RangeExpression, RootPath, SizeExpression, SquareRootExpression, SubStringExpression, SumExpression, TimesExpression, TrimExpression, TypeExpression, UnaryMinusExpression, 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.