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Java Source Code / Java Documentation » Rule Engine » drolls Rule Engine » org.drools.lang 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.drools.lang.Expander

All known Subclasses:   org.drools.lang.MockExpander,  org.drools.lang.dsl.DefaultExpander,
Expander
public interface Expander (Code)
Expanders are extension points for expanding expressions in DRL at parse time. This is just-in-time translation, or macro expansion, or whatever you want. The important thing is that it happens at the last possible moment, so any errors in expansion are included in the parsers errors. Just-in-time expansions may include complex pre-compilers, or just macros, and everything in between. Expanders should ideally not make presumptions on any embedded semantic language. For instance, java aware pre processing should be done in drools-java semantic module, not in the parser itself. Expanders should be reusable across semantic languages.
author:
   Michael Neale




Method Summary
public  voidaddDSLMapping(DSLMapping mapping)
     Add the new mapping to this expander.
public  Stringexpand(Reader drl)
     Expands (process) the expression Just-In-Time for the parser.
public  Stringexpand(String source)
     Expands (process) the expression Just-In-Time for the parser.
public  ListgetErrors()
    
public  booleanhasErrors()
    



Method Detail
addDSLMapping
public void addDSLMapping(DSLMapping mapping)(Code)
Add the new mapping to this expander.
Parameters:
  mapping -



expand
public String expand(Reader drl) throws IOException(Code)
Expands (process) the expression Just-In-Time for the parser. If the source is not meant to be expanded, or if no appropriate match was found for expansion, it will echo back the same expression.
Parameters:
  drl - the source code to be pre-processed source code after running pre-processors



expand
public String expand(String source)(Code)
Expands (process) the expression Just-In-Time for the parser. If the source is not meant to be expanded, or if no appropriate match was found for expansion, it will echo back the same expression.
Parameters:
  source - the source code to be expanded source code after running pre-processors



getErrors
public List getErrors()(Code)
Returns the list of errors from the last expansion made A list of ExpanderException



hasErrors
public boolean hasErrors()(Code)
Returns true in case the last expansion had any errors



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