/**
* Builds and returns an Eval Conditional Element
*
* @param context The current build context
* @param utils The current build utils instance
* @param patternBuilder not used by EvalBuilder
* @param descr The Eval Descriptor to build the eval conditional element from
* @return the Eval Conditional Element
*/
public RuleConditionElement build(
final RuleBuildContext context, final BaseDescr descr, final Pattern prefixPattern) {
// it must be an EvalDescr
final EvalDescr evalDescr = (EvalDescr) descr;
final String className = "eval" + context.getNextId();
evalDescr.setClassMethodName(className);
Map<String, Declaration> decls =
context.getDeclarationResolver().getDeclarations(context.getRule());
AnalysisResult analysis =
context
.getDialect()
.analyzeExpression(
context,
evalDescr,
evalDescr.getContent(),
new BoundIdentifiers(
context.getDeclarationResolver().getDeclarationClasses(decls),
context.getPackageBuilder().getGlobals()));
final BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();
final Declaration[] declarations = decls.values().toArray(new Declaration[decls.size()]);
Arrays.sort(declarations, SortDeclarations.instance);
final EvalCondition eval = new EvalCondition(declarations);
final Map map =
createVariableContext(
className,
(String) evalDescr.getContent(),
context,
declarations,
null,
usedIdentifiers.getGlobals(),
null);
generatTemplates("evalMethod", "evalInvoker", context, className, map, eval, descr);
return eval;
}
private Declaration[] getUsedDeclarations(
Map<String, Declaration> decls, AnalysisResult analysis) {
final BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();
List<Declaration> usedDeclarations = new ArrayList<Declaration>();
for (String id : usedIdentifiers.getDeclrClasses().keySet()) {
if (decls.containsKey(id)) {
usedDeclarations.add(decls.get(id));
}
}
if (!usedDeclarations.isEmpty()) {
Collections.sort(usedDeclarations, SortDeclarations.instance);
}
return usedDeclarations.toArray(new Declaration[usedDeclarations.size()]);
}
/**
* Builds and returns an Eval Conditional Element
*
* @param context The current build context
* @param utils The current build utils instance
* @param patternBuilder not used by EvalBuilder
* @param descr The Eval Descriptor to build the eval conditional element from
* @return the Eval Conditional Element
*/
public RuleConditionElement build(
final RuleBuildContext context, final BaseDescr descr, final Pattern prefixPattern) {
boolean typesafe = context.isTypesafe();
// it must be an EvalDescr
final EvalDescr evalDescr = (EvalDescr) descr;
try {
MVELDialect dialect = (MVELDialect) context.getDialect(context.getDialect().getId());
Map<String, Declaration> decls =
context.getDeclarationResolver().getDeclarations(context.getRule());
AnalysisResult analysis =
context
.getDialect()
.analyzeExpression(
context,
evalDescr,
evalDescr.getContent(),
new BoundIdentifiers(
context.getDeclarationResolver().getDeclarationClasses(decls),
context.getPackageBuilder().getGlobals()));
final BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();
int i = usedIdentifiers.getDeclrClasses().keySet().size();
Declaration[] previousDeclarations = new Declaration[i];
i = 0;
for (String id : usedIdentifiers.getDeclrClasses().keySet()) {
previousDeclarations[i++] = decls.get(id);
}
Arrays.sort(previousDeclarations, SortDeclarations.instance);
MVELCompilationUnit unit =
dialect.getMVELCompilationUnit(
(String) evalDescr.getContent(),
analysis,
previousDeclarations,
null,
null,
context,
"drools",
KnowledgeHelper.class,
false);
final EvalCondition eval = new EvalCondition(previousDeclarations);
MVELEvalExpression expr = new MVELEvalExpression(unit, dialect.getId());
eval.setEvalExpression(expr);
MVELDialectRuntimeData data =
(MVELDialectRuntimeData)
context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
data.addCompileable(eval, expr);
expr.compile(data);
return eval;
} catch (final Exception e) {
copyErrorLocation(e, evalDescr);
context.addError(
new DescrBuildError(
context.getParentDescr(),
evalDescr,
e,
"Unable to build expression for 'eval':"
+ e.getMessage()
+ " '"
+ evalDescr.getContent()
+ "'"));
return null;
} finally {
context.setTypesafe(typesafe);
}
}
