org.drools.lang.dsl
Class DefaultExpander

java.lang.Object
  org.drools.lang.dsl.DefaultExpander

All Implemented Interfaces:

Expander

public class DefaultExpander

extends java.lang.Object

implements Expander

The default expander uses String templates to provide pseudo natural language, as well as general DSLs. For most people, this should do the job just fine.

Constructor Summary

DefaultExpander(java.io.Reader reader)
Use {0} style notation to place "holes" where data will be parsed from the natural text input.

Method Summary

java.lang.String

expand(java.lang.String scope, java.lang.String pattern) The parser should call this on an expression/line that potentially needs expanding BEFORE it parses that line (as the line may change radically as the result of expansion).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DefaultExpander

public DefaultExpander(java.io.Reader reader)

Use {0} style notation to place "holes" where data will be parsed from the natural text input.

See Also:

for details.

Method Detail

expand

public java.lang.String expand(java.lang.String scope,
                               java.lang.String pattern)

Description copied from interface: Expander

The parser should call this on an expression/line that potentially needs expanding BEFORE it parses that line (as the line may change radically as the result of expansion). Expands the expression Just-In-Time for the parser. If the expression is not meant to be expanded, or if no appropriate expander is found, it will echo back the same expression.

Specified by:

expand in interface Expander

Parameters:

scope - The current scope of the expansion (eg "when" for LHS)

Returns:

A correct expression for the parser to reparse.