Package org.jaxen.function
Class SubstringBeforeFunction
- java.lang.Object
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- org.jaxen.function.SubstringBeforeFunction
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- All Implemented Interfaces:
Function
public class SubstringBeforeFunction extends java.lang.Object implements Function
4.2
string substring-before(string,string)The substring-before function returns the substring of the first argument string that precedes the first occurrence of the second argument string in the first argument string, or the empty string if the first argument string does not contain the second argument string. For example, substring-before("1999/04/01","/") returns 1999.
- Author:
- bob mcwhirter (bob @ werken.com)
- See Also:
- Section 4.2 of the XPath Specification
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Constructor Summary
Constructors Constructor Description SubstringBeforeFunction()Create a newSubstringBeforeFunctionobject.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Objectcall(Context context, java.util.List args)Returns the part of the string-value of the first item inargsthat comes before the string-value of the second item inargs; or the empty string if the second string is not a substring of the first string.static java.lang.Stringevaluate(java.lang.Object strArg, java.lang.Object matchArg, Navigator nav)Returns the part ofstrArgthat precedes the first occurence ofmatchArg; or the empty string if thestrArgdoes not containmatchArg
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Method Detail
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call
public java.lang.Object call(Context context, java.util.List args) throws FunctionCallException
Returns the part of the string-value of the first item inargsthat comes before the string-value of the second item inargs; or the empty string if the second string is not a substring of the first string.- Specified by:
callin interfaceFunction- Parameters:
context- the context at the point in the expression when the function is calledargs- a list that contains two items- Returns:
- a
Stringcontaining that part of the string-value of the first item inargsthat comes before the string-value of the second item inargs - Throws:
FunctionCallException- ifargsdoes not have length two
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evaluate
public static java.lang.String evaluate(java.lang.Object strArg, java.lang.Object matchArg, Navigator nav)Returns the part ofstrArgthat precedes the first occurence ofmatchArg; or the empty string if thestrArgdoes not containmatchArg- Parameters:
strArg- the string from which the substring is extractedmatchArg- the string that marks the boundary of the substringnav- theNavigatorused to calculate the string-values of the first two arguments- Returns:
- a
Stringcontaining the part ofstrArgthat precedes the first occurence ofmatchArg
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