public void visitAccumulateDescr(final AccumulateDescr descr) { String tmpstr = new String(); tmpstr += this.template + " <from> <accumulate> "; if (descr.isSinglePattern()) { visitPatternDescr(descr.getInputPattern()); } else { this.patternContext = false; visit(descr.getInput()); } tmpstr += this.template; if (descr.isExternalFunction()) { AccumulateFunctionCallDescr func = descr.getFunctions().get(0); tmpstr += "<external-function evaluator=\"" + func.getFunction() + "\" expression=\"" + func.getParams()[0] + "\"/>"; } else tmpstr += "<init>" + descr.getInitCode() + "</init><action>" + descr.getActionCode() + "</action><result>" + descr.getResultCode() + "</result>"; this.template = tmpstr + " </accumulate> </from> "; }
@SuppressWarnings("unchecked") public RuleConditionElement build( final RuleBuildContext context, final BaseDescr descr, final Pattern prefixPattern) { boolean typesafe = context.isTypesafe(); try { final AccumulateDescr accumDescr = (AccumulateDescr) descr; if (!accumDescr.hasValidInput()) { return null; } final RuleConditionBuilder builder = (RuleConditionBuilder) context.getDialect().getBuilder(accumDescr.getInput().getClass()); // create source CE final RuleConditionElement source = builder.build(context, accumDescr.getInput()); if (source == null) { return null; } MVELDialect dialect = (MVELDialect) context.getDialect(); Map<String, Declaration> decls = context.getDeclarationResolver().getDeclarations(context.getRule()); Map<String, Declaration> sourceOuterDeclr = source.getOuterDeclarations(); Map<String, Declaration> mergedDecl = new HashMap(decls); mergedDecl.putAll(sourceOuterDeclr); Map<String, Class<?>> declarationClasses = DeclarationScopeResolver.getDeclarationClasses(decls); declarationClasses.putAll(DeclarationScopeResolver.getDeclarationClasses(sourceOuterDeclr)); BoundIdentifiers boundIds = new BoundIdentifiers(declarationClasses, context.getKnowledgeBuilder().getGlobals()); boundIds.setDeclarations(mergedDecl); Accumulator[] accumulators; final boolean readLocalsFromTuple = PackageBuilderUtil.isReadLocalsFromTuple(context, accumDescr, source); if (accumDescr.isExternalFunction()) { // uses accumulate functions accumulators = buildExternalFunctions( context, accumDescr, dialect, decls, sourceOuterDeclr, boundIds, readLocalsFromTuple); } else { // it is a custom accumulate accumulators = buildCustomAccumulate( context, accumDescr, dialect, decls, sourceOuterDeclr, boundIds, readLocalsFromTuple); } List<Declaration> requiredDeclarations = new ArrayList<Declaration>(); for (Accumulator acc : accumulators) { MvelAccumulator mvelAcc = (MvelAccumulator) acc; Collections.addAll(requiredDeclarations, mvelAcc.getRequiredDeclarations()); } MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel"); Accumulate accumulate; if (accumDescr.isMultiFunction()) { accumulate = new MultiAccumulate( source, requiredDeclarations.toArray(new Declaration[requiredDeclarations.size()]), accumulators); int index = 0; for (Accumulator accumulator : accumulators) { data.addCompileable( ((MultiAccumulate) accumulate).new Wirer(index++), (MVELCompileable) accumulator); ((MVELCompileable) accumulator).compile(data, context.getRule()); } } else { accumulate = new SingleAccumulate( source, requiredDeclarations.toArray(new Declaration[requiredDeclarations.size()]), accumulators[0]); data.addCompileable( ((SingleAccumulate) accumulate).new Wirer(), (MVELCompileable) accumulators[0]); ((MVELCompileable) accumulators[0]).compile(data, context.getRule()); } return accumulate; } catch (Exception e) { DialectUtil.copyErrorLocation(e, descr); context.addError( new DescrBuildError( context.getParentDescr(), descr, e, "Unable to build expression for 'accumulate' : " + e.getMessage())); return null; } finally { context.setTypesafe(typesafe); } }