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| pr_methods:calculate [2023/04/04 07:17] – removed - external edit (Unknown date) 127.0.0.1 | pr_methods:calculate [2023/05/08 06:47] (current) – sean |
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| | {{tag>Index Programmers_Reference Methods IFunctionLibrary_Interface Calculate}} |
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| | ====calculate (String, Object [], INodeHelper)==== |
| | <code java>public Object calculate (String functionName, Object [] parameters, INodeHelper helper)</code> |
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| | This method is what the function is all about – it performs the required calculation and returns the result. |
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| | ===Parameters=== |
| | |''functionName''|the name of the function in the library that needs to be calculated| |
| | |''parameters''|the values of function parameters as specified in a rule where the function is used. The given array contains Java objects corresponding to different attribute types (''String'', ''Integer'', ''DateHolder'' etc – see a complete list in the [[docs:3500:appendix_a|Appendix A]])| |
| | |''helper''|a call-back interface. Should not be used by custom function libraries.| |
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| | ===Returns=== |
| | The result of the calculation as a Java object of the type corresponding to the attribute types – see [[docs:3500:appendix_a|Appendix A]]. If the function value cannot be calculated for whatever reason (for example, the number of parameters or their types are wrong), ''null'' should be returned. |
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