public void execute(Map<String, Object> context, List<String[]> args) {
BuildContext buildContext = (BuildContext) context.get("BuildContext");
if (args.size() >= 1) {
// The first argument list is the node parameters
String[] a = args.get(0);
String name = a[0];
String leftInput = a[1];
String rightInput = a[2];
String sourceType = a[3];
String expr = a[4];
Class cls = null;
LeftTupleSource leftTupleSource;
if (leftInput.startsWith("mock")) {
leftTupleSource = new MockTupleSource(buildContext.getNextId());
} else {
leftTupleSource = (LeftTupleSource) context.get(leftInput);
}
ObjectSource rightObjectSource;
if (rightInput.startsWith("mock")) {
String type = rightInput.substring(5, rightInput.length() - 1);
try {
cls = reteTesterHelper.getTypeResolver().resolveType(type);
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
rightObjectSource = new MockObjectSource(buildContext.getNextId());
} else {
rightObjectSource = (ObjectSource) context.get(rightInput);
ObjectSource source = rightObjectSource;
while (!(source instanceof ObjectTypeNode)) {
source = source.getParentObjectSource();
}
cls = ((ClassObjectType) ((ObjectTypeNode) source).getObjectType()).getClassType();
}
Pattern sourcePattern;
Pattern resultPattern;
try {
sourcePattern = reteTesterHelper.getPattern(0, sourceType);
// we always use the accumulate function "sum", so return type is always Number
resultPattern =
reteTesterHelper.getPattern(buildContext.getNextId(), Number.class.getName());
} catch (Exception e) {
throw new IllegalArgumentException(
"Not possible to process arguments: " + Arrays.toString(a));
}
List<BetaNodeFieldConstraint> list = new ArrayList<BetaNodeFieldConstraint>();
AlphaNodeFieldConstraint[] alphaResultConstraint = new AlphaNodeFieldConstraint[0];
// the following arguments are constraints
for (int i = 1; i < args.size(); i++) {
a = args.get(i);
String type = a[0];
String fieldName = a[1];
String operator = a[2];
String val = a[3];
if ("source".equals(type)) {
Declaration declr = (Declaration) context.get(val);
try {
BetaNodeFieldConstraint sourceBetaConstraint =
this.reteTesterHelper.getBoundVariableConstraint(cls, fieldName, declr, operator);
list.add(sourceBetaConstraint);
} catch (IntrospectionException e) {
throw new IllegalArgumentException();
}
} else if ("result".equals(type)) {
alphaResultConstraint = new AlphaNodeFieldConstraint[1];
try {
alphaResultConstraint[0] =
this.reteTesterHelper.getLiteralConstraint(resultPattern, fieldName, operator, val);
} catch (IntrospectionException e) {
throw new IllegalArgumentException(
"Unable to configure alpha constraint: " + Arrays.toString(a), e);
}
}
}
BetaConstraints betaSourceConstraints;
switch (list.size()) {
case 0:
betaSourceConstraints = new EmptyBetaConstraints();
break;
case 1:
betaSourceConstraints =
new SingleBetaConstraints(
list.get(0), buildContext.getKnowledgeBase().getConfiguration());
break;
case 2:
betaSourceConstraints =
new DoubleBetaConstraints(
list.toArray(new BetaNodeFieldConstraint[2]),
buildContext.getKnowledgeBase().getConfiguration());
break;
case 3:
betaSourceConstraints =
new TripleBetaConstraints(
list.toArray(new BetaNodeFieldConstraint[2]),
buildContext.getKnowledgeBase().getConfiguration());
break;
case 4:
betaSourceConstraints =
new QuadroupleBetaConstraints(
list.toArray(new BetaNodeFieldConstraint[2]),
buildContext.getKnowledgeBase().getConfiguration());
break;
default:
betaSourceConstraints =
new DefaultBetaConstraints(
list.toArray(new BetaNodeFieldConstraint[2]),
buildContext.getKnowledgeBase().getConfiguration());
break;
}
MVELDialectRuntimeData data =
(MVELDialectRuntimeData)
buildContext
.getKnowledgeBase()
.getPackage(buildContext.getRule().getPackageName())
.getDialectRuntimeRegistry()
.getDialectData("mvel");
data.onAdd(null, buildContext.getKnowledgeBase().getRootClassLoader());
// MvelD data = (MVELDialectRuntimeData) buildContext.getRuleBase().getPackage(
// buildContext.getRule().getName() ).getDialectRuntimeRegistry().getDialectData( "mvel" );
NodeTestCase testCase = (NodeTestCase) context.get("TestCase");
try {
for (String imp : testCase.getImports()) {
if (imp.endsWith(".*")) {
data.addPackageImport(imp.substring(0, imp.lastIndexOf('.')));
} else {
// classImports.add( imp );
cls = data.getRootClassLoader().loadClass(imp);
data.addImport(cls.getSimpleName(), cls);
}
}
} catch (Exception e) {
throw new RuntimeException("Unable to load class", e);
}
Declaration decl = (Declaration) context.get(expr);
// build an external function executor
MVELCompilationUnit compilationUnit =
new MVELCompilationUnit(
name,
expr,
new String[] {}, // global identifiers
new EvaluatorWrapper[] {}, // operator identifiers
new Declaration[] {}, // previous declarations
new Declaration[] {decl}, // local declarations
new String[] {}, // other identifiers
new String[] {
"this", "drools", "kcontext", "rule", decl.getIdentifier()
}, // input identifiers
new String[] {
Object.class.getName(),
KnowledgeHelper.class.getName(),
KnowledgeHelper.class.getName(),
Rule.class.getName(),
decl.getValueType().getClassType().getName()
}, // input types
4,
false,
false);
AccumulateFunction accFunction = new SumAccumulateFunction();
Accumulator accumulator = new MVELAccumulatorFunctionExecutor(compilationUnit, accFunction);
((MVELCompileable) accumulator).compile(data);
Accumulate accumulate =
new SingleAccumulate(
sourcePattern,
new Declaration[] {}, // required declaration
accumulator);
AccumulateNode accNode =
new AccumulateNode(
buildContext.getNextId(),
leftTupleSource,
rightObjectSource,
alphaResultConstraint,
betaSourceConstraints,
new EmptyBetaConstraints(),
accumulate,
false,
buildContext);
accNode.attach(buildContext);
context.put(name, accNode);
} else {
StringBuilder msgBuilder = new StringBuilder();
msgBuilder.append("Can not parse AccumulateNode step arguments: \n");
for (String[] arg : args) {
msgBuilder.append(" ");
msgBuilder.append(Arrays.toString(arg));
msgBuilder.append("\n");
}
throw new IllegalArgumentException(msgBuilder.toString());
}
}
@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);
}
}