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JBoss RULES 3.0.6 API 英文版文档
NLExpressionCompiler - JBoss RULES 3.0.6 API 英文版文档
org.drools.lang.dsl.template
Class NLExpressionCompiler
java.lang.Object
org.drools.lang.dsl.template.NLExpressionCompiler
public class NLExpressionCompiler
- extends java.lang.Object
This is the utility class for compiling pseudo natural/DSL expression into the target
language, via the supplied mappings.
This version works off "string templates" rather then infix operators.
Note that this is not particularly efficient for large grammars - IN THEORY !
However, I have tested it with grammars of 200 000 terms, and it took less then a second per expression,
so its no slouch. This could be a problem for bulk compiling of large pkgs with thousands of conditions.
In general, grammars of < 1000 items should be fine. The cost is a parse time cost for Drools, which can be done
incrementally in a suitable environment ideally anyway.
It will go through each item in the grammar, trying to apply it regardless of if it is needed.
This may be improved by some early regex scanning, but most likely this will not really save much.
|
Method Summary |
java.lang.String |
compile(java.lang.String expression,
java.lang.String scope)
This will iterate through the grammar, trying to match any grammar templates with the expression. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
NLExpressionCompiler
public NLExpressionCompiler(NLGrammar grammar)
compile
public java.lang.String compile(java.lang.String expression,
java.lang.String scope)
- This will iterate through the grammar, trying to match any grammar templates with the expression.
When it can, it will pull the values out of the expression, put them in the target string, and then swap it out with
the original, and then move on to the next item from the grammar/dictionary.
scope is to indicate if it is expanding condition or consequence.
(null will only expand globals).
