Package net.obvj.jep.functions

Provides functions for the Java Expression Parser.

See: Description

Interface Summary

Interface	Description
MultiStrategyCommand	A common interface for objects that implement multiple strategies

Class Summary

Class	Description
Arabic	A function command that converts a Roman numeral to Arabic.
Average	This class implements a function that returns the average of collection of elements.
BasicAuthorizationHeader	This class implements a JEP function that generates a basic authorization header from given credentials (username and password).
BinaryBooleanFunction	An "abstract" function that accepts two parameters (of any type) and returns 1 (true) or 0 (false), depending on the target evaluation strategy.
BinaryDateFunction	An "abstract" function that receives two objects: a Date and an integer, and returns a Date, with concrete behavior defined by BinaryDateFunction.Strategy.
BinaryStringFunction	An "abstract" function that accepts two strings and returns an object.
Concat	This class implements a JEP function command that concatenates elements.
Count	This class implements a JEP function that counts elements.
DateAwareComparative	An extension of JEP's Comparative command that can also handle strings and dates.
DateFieldGetter	An "abstract" function that returns a field from a Date, depending on the assigned DateFieldGetter.DateField fetching strategy.
DateToString	A command that formats dates in a specified pattern
DaysBetween	A command that returns the number of days between two dates
Distinct	This class implements a function that returns a list consisting of distinct elements of a given collection.
Element	A command that returns elements from Java Lists and JSONArrays given the index.
EndOfMonth	A function that returns the date corresponding to the last day of the month given a source date
FormatString	A command that formats strings based on a pattern and variable arguments
Http	A function that invokes a method from a Web Server, given a method, a URL, a request body, and an optional headers, and returns a client response object.
HttpGet	A function that reads content from a Web Server, given a URL and an optional media type, and returns server response as string
HttpHeader	This class implements a JEP function that groups HTTP header values together into a Map os Strings for usage with the Http and HttpGet functions.
HttpResponseHandler	An "abstract" function that reads data from a WebServiceResponse object.
IsEmpty	A function that returns 1 if the given parameter is either an empty String, JSON or Collection, or 0 if not.
IsLeapYear	A function that returns 1 if the given parameter is either a leap year or a Date whose year is a leap year, or 0 if not.
JsonPath	This class implements a function that evaluates JSONPaths.
Max	This class implements a function that returns the highest element in a collection of elements using Java Expression Parser.
Min	This class implements a function that returns the lowest element in a collection of elements using Java Expression Parser.
NormalizeString	This class implements a JEP function that normalizes Unicode strings, replacing accents and other diacritics with ASCII characters.
Now	This class implements a function command that returns system's current date and time.
ReadFile	A function that reads the content a text file from the file system
Replace	An "abstract" function that replaces occurrences of a string with another string.
Roman	A function command that converts an Arabic numeral to Roman.
StringPaddingFunction	An "abstract" function for string padding, which accepts a variable number of arguments (either two or three parameters), and executes a particular strategy defined by StringPaddingFunction.Strategy.
StringToDate	A function that converts a string into a date.
TypeOf	A function that returns the Java type associated with the given parameter
UnaryBooleanFunction	An "abstract" function that accepts one object as argument and returns a boolean value, represented as 1 (true) or 0 (false).
UnaryEncryptionFunction	An "abstract" function that accepts one object as parameter and converts it into an encrypted string.
UnaryStringFunction	An "abstract" function that receives a string object and produces another string after processing the strategy defined by a delegating UnaryStringFunction.Strategy.
UnarySystemFunction	An "abstract" function that receives a single parameter and retrieves system data.
UUID	This class implements a JEP function that produces a UUID.
XPath	This class implements a function that evaluates XPaths.

Enum Summary

Enum	Description
BinaryBooleanFunction.Strategy	Defines particular strategies for the BinaryBooleanFunction.
BinaryDateFunction.Strategy	Defines particular strategies for the BinaryDateFunction.
BinaryStringFunction.Strategy	Defines particular concrete behaviors for the BinaryStringFunction.
DateFieldGetter.DateField	Defines particular field-fetching strategies for a given date.
HttpResponseHandler.Strategy	Defines particular data-fetch strategies for a given WebServiceResponse.
Replace.Strategy	Defines particular strategies for the Replace function.
StringPaddingFunction.Strategy	Defines particular string-padding behaviors, such as right-padding and left-padding.
UnaryBooleanFunction.Strategy	Defines particular object predicates for the UnaryBooleanFunction.
UnaryEncryptionFunction.EncryptionAlgorithm	Defines particular strategies for string encryption, such as the encryption algorithm.
UnaryStringFunction.Strategy	Defines the strategy to be executed for a string, such as trimming and conversion to lower/upper/camel-case.
UnarySystemFunction.Strategy	Defines particular strategies for the UnarySystemFunction.

Annotation Types Summary

Annotation Type	Description
Function	Indicates that an object is a custom function, and assigns names/aliases to it.

Package net.obvj.jep.functions Description

Provides functions for the Java Expression Parser.

A function is an object that extends JEP's PostfixMathCommand. This class uses a stack for passing the arguments via the run() method.

Each function can also receive a custom annotation @Function, which basically tells the JEPContextFactory the function name and alias to be registered.

Since:

1.0.0