use of org.drools.javaparser.ast.expr.VariableDeclarationExpr in project drools by kiegroup.
the class ModelGenerator method processRule.
private static void processRule(KnowledgeBuilderImpl kbuilder, TypeResolver typeResolver, PackageModel packageModel, PackageDescr packageDescr, RuleDescr ruleDescr, boolean isPattern) {
RuleContext context = new RuleContext(kbuilder, packageModel, ruleDescr, typeResolver, isPattern);
for (Entry<String, Object> kv : ruleDescr.getNamedConsequences().entrySet()) {
context.addNamedConsequence(kv.getKey(), kv.getValue().toString());
}
new ModelGeneratorVisitor(context, packageModel).visit(getExtendedLhs(packageDescr, ruleDescr));
final String ruleMethodName = "rule_" + toId(ruleDescr.getName());
MethodDeclaration ruleMethod = new MethodDeclaration(EnumSet.of(Modifier.PUBLIC, Modifier.STATIC), RULE_TYPE, ruleMethodName);
ruleMethod.setJavadocComment(" Rule name: " + ruleDescr.getName() + " ");
VariableDeclarationExpr ruleVar = new VariableDeclarationExpr(RULE_TYPE, RULE_CALL);
MethodCallExpr ruleCall = new MethodCallExpr(null, RULE_CALL);
if (!ruleDescr.getNamespace().isEmpty()) {
ruleCall.addArgument(new StringLiteralExpr(ruleDescr.getNamespace()));
}
ruleCall.addArgument(new StringLiteralExpr(ruleDescr.getName()));
RuleUnitDescr ruleUnitDescr = context.getRuleUnitDescr();
MethodCallExpr buildCallScope = ruleUnitDescr != null ? new MethodCallExpr(ruleCall, UNIT_CALL).addArgument(new ClassExpr(classToReferenceType(ruleUnitDescr.getRuleUnitClass()))) : ruleCall;
for (MethodCallExpr attributeExpr : ruleAttributes(context, ruleDescr)) {
attributeExpr.setScope(buildCallScope);
buildCallScope = attributeExpr;
}
for (MethodCallExpr metaAttributeExpr : ruleMetaAttributes(context, ruleDescr)) {
metaAttributeExpr.setScope(buildCallScope);
buildCallScope = metaAttributeExpr;
}
MethodCallExpr buildCall = new MethodCallExpr(buildCallScope, BUILD_CALL, NodeList.nodeList(context.getExpressions()));
BlockStmt ruleVariablesBlock = new BlockStmt();
createUnitData(ruleUnitDescr, ruleVariablesBlock);
createVariables(kbuilder, ruleVariablesBlock, packageModel, context);
ruleMethod.setBody(ruleVariablesBlock);
MethodCallExpr executeCall = new Consequence(context).createCall(ruleDescr, ruleDescr.getConsequence().toString(), ruleVariablesBlock, false);
buildCall.addArgument(executeCall);
ruleVariablesBlock.addStatement(new AssignExpr(ruleVar, buildCall, AssignExpr.Operator.ASSIGN));
ruleVariablesBlock.addStatement(new ReturnStmt(RULE_CALL));
packageModel.putRuleMethod(ruleMethodName, ruleMethod);
}
use of org.drools.javaparser.ast.expr.VariableDeclarationExpr in project drools by kiegroup.
the class QueryGenerator method processQuery.
public static void processQuery(KnowledgeBuilderImpl kbuilder, PackageModel packageModel, QueryDescr queryDescr) {
String queryDefVariableName = toQueryDef(queryDescr.getName());
RuleContext context = packageModel.getQueryDefWithType().get(queryDefVariableName).getContext();
new ModelGeneratorVisitor(context, packageModel).visit(queryDescr.getLhs());
final Type queryType = JavaParser.parseType(Query.class.getCanonicalName());
MethodDeclaration queryMethod = new MethodDeclaration(EnumSet.of(Modifier.PRIVATE), queryType, "query_" + toId(queryDescr.getName()));
BlockStmt queryBody = new BlockStmt();
ModelGenerator.createVariables(kbuilder, queryBody, packageModel, context);
queryMethod.setBody(queryBody);
String queryBuildVarName = toId(queryDescr.getName()) + "_build";
VariableDeclarationExpr queryBuildVar = new VariableDeclarationExpr(queryType, queryBuildVarName);
MethodCallExpr buildCall = new MethodCallExpr(new NameExpr(queryDefVariableName), BUILD_CALL);
context.getExpressions().forEach(buildCall::addArgument);
AssignExpr queryBuildAssign = new AssignExpr(queryBuildVar, buildCall, AssignExpr.Operator.ASSIGN);
queryBody.addStatement(queryBuildAssign);
queryBody.addStatement(new ReturnStmt(queryBuildVarName));
packageModel.putQueryMethod(queryMethod);
}
use of org.drools.javaparser.ast.expr.VariableDeclarationExpr in project drools by kiegroup.
the class AccumulateVisitor method visitAccInlineCustomCode.
/**
* By design this legacy accumulate (with inline custome code) visitor supports only with 1-and-only binding in the accumulate code/expressions.
*/
protected void visitAccInlineCustomCode(RuleContext context2, AccumulateDescr descr, MethodCallExpr accumulateDSL, PatternDescr basePattern, PatternDescr inputDescr) {
context.pushExprPointer(accumulateDSL::addArgument);
final MethodCallExpr functionDSL = new MethodCallExpr(null, "accFunction");
String code = null;
try {
code = new String(IoUtils.readBytesFromInputStream(this.getClass().getResourceAsStream("/AccumulateInlineFunction.java")));
} catch (IOException e1) {
e1.printStackTrace();
throw new RuntimeException("Unable to locate template.");
}
String targetClassName = StringUtil.toId(context2.getRuleDescr().getName()) + "Accumulate" + descr.getLine();
code = code.replaceAll("AccumulateInlineFunction", targetClassName);
CompilationUnit templateCU = JavaParser.parse(code);
ClassOrInterfaceDeclaration templateClass = templateCU.getClassByName(targetClassName).orElseThrow(() -> new RuntimeException("Template did not contain expected type definition."));
ClassOrInterfaceDeclaration templateContextClass = templateClass.getMembers().stream().filter(m -> m instanceof ClassOrInterfaceDeclaration && ((ClassOrInterfaceDeclaration) m).getNameAsString().equals("ContextData")).map(ClassOrInterfaceDeclaration.class::cast).findFirst().orElseThrow(() -> new RuntimeException("Template did not contain expected type definition."));
List<String> contextFieldNames = new ArrayList<>();
MethodDeclaration initMethod = templateClass.getMethodsByName("init").get(0);
BlockStmt initBlock = JavaParser.parseBlock("{" + descr.getInitCode() + "}");
for (Statement stmt : initBlock.getStatements()) {
if (stmt instanceof ExpressionStmt && ((ExpressionStmt) stmt).getExpression() instanceof VariableDeclarationExpr) {
VariableDeclarationExpr vdExpr = (VariableDeclarationExpr) ((ExpressionStmt) stmt).getExpression();
for (VariableDeclarator vd : vdExpr.getVariables()) {
contextFieldNames.add(vd.getNameAsString());
templateContextClass.addField(vd.getType(), vd.getNameAsString(), Modifier.PUBLIC);
if (vd.getInitializer().isPresent()) {
Expression initializer = vd.getInitializer().get();
Expression target = new FieldAccessExpr(new NameExpr("data"), vd.getNameAsString());
Statement initStmt = new ExpressionStmt(new AssignExpr(target, initializer, AssignExpr.Operator.ASSIGN));
initMethod.getBody().get().addStatement(initStmt);
}
}
} else {
// add as-is.
initMethod.getBody().get().addStatement(stmt);
}
}
Type singleAccumulateType = JavaParser.parseType("java.lang.Object");
MethodDeclaration accumulateMethod = templateClass.getMethodsByName("accumulate").get(0);
BlockStmt actionBlock = JavaParser.parseBlock("{" + descr.getActionCode() + "}");
Collection<String> allNamesInActionBlock = collectNamesInBlock(context2, actionBlock);
if (allNamesInActionBlock.size() == 1) {
String nameExpr = allNamesInActionBlock.iterator().next();
accumulateMethod.getParameter(1).setName(nameExpr);
singleAccumulateType = context2.getDeclarationById(nameExpr).get().getType();
} else {
new LegacyAccumulate(context, descr, basePattern).build();
return;
}
writeAccumulateMethod(contextFieldNames, singleAccumulateType, accumulateMethod, actionBlock);
// <result expression>: this is a semantic expression in the selected dialect that is executed after all source objects are iterated.
MethodDeclaration resultMethod = templateClass.getMethodsByName("getResult").get(0);
Type returnExpressionType = JavaParser.parseType("java.lang.Object");
Expression returnExpression = JavaParser.parseExpression(descr.getResultCode());
if (returnExpression instanceof NameExpr) {
returnExpression = new EnclosedExpr(returnExpression);
}
rescopeNamesToNewScope(new NameExpr("data"), contextFieldNames, returnExpression);
resultMethod.getBody().get().addStatement(new ReturnStmt(returnExpression));
MethodDeclaration getResultTypeMethod = templateClass.getMethodsByName("getResultType").get(0);
getResultTypeMethod.getBody().get().addStatement(new ReturnStmt(new ClassExpr(returnExpressionType)));
if (descr.getReverseCode() != null) {
MethodDeclaration supportsReverseMethod = templateClass.getMethodsByName("supportsReverse").get(0);
supportsReverseMethod.getBody().get().addStatement(JavaParser.parseStatement("return true;"));
MethodDeclaration reverseMethod = templateClass.getMethodsByName("reverse").get(0);
BlockStmt reverseBlock = JavaParser.parseBlock("{" + descr.getReverseCode() + "}");
Collection<String> allNamesInReverseBlock = collectNamesInBlock(context2, reverseBlock);
if (allNamesInReverseBlock.size() == 1) {
reverseMethod.getParameter(1).setName(allNamesInReverseBlock.iterator().next());
} else {
new LegacyAccumulate(context, descr, basePattern).build();
return;
}
writeAccumulateMethod(contextFieldNames, singleAccumulateType, reverseMethod, reverseBlock);
} else {
MethodDeclaration supportsReverseMethod = templateClass.getMethodsByName("supportsReverse").get(0);
supportsReverseMethod.getBody().get().addStatement(JavaParser.parseStatement("return false;"));
MethodDeclaration reverseMethod = templateClass.getMethodsByName("reverse").get(0);
reverseMethod.getBody().get().addStatement(JavaParser.parseStatement("throw new UnsupportedOperationException(\"This function does not support reverse.\");"));
}
// add resulting accumulator class into the package model
this.packageModel.addGeneratedPOJO(templateClass);
functionDSL.addArgument(new ClassExpr(JavaParser.parseType(targetClassName)));
functionDSL.addArgument(new NameExpr(toVar(inputDescr.getIdentifier())));
final String bindingId = basePattern.getIdentifier();
final MethodCallExpr asDSL = new MethodCallExpr(functionDSL, "as");
asDSL.addArgument(new NameExpr(toVar(bindingId)));
accumulateDSL.addArgument(asDSL);
context.popExprPointer();
}
use of org.drools.javaparser.ast.expr.VariableDeclarationExpr in project drools by kiegroup.
the class Consequence method rewriteRHS.
private boolean rewriteRHS(BlockStmt ruleBlock, BlockStmt rhs) {
AtomicBoolean requireDrools = new AtomicBoolean(false);
List<MethodCallExpr> methodCallExprs = rhs.findAll(MethodCallExpr.class);
List<MethodCallExpr> updateExprs = new ArrayList<>();
for (MethodCallExpr methodCallExpr : methodCallExprs) {
if (isDroolsMethod(methodCallExpr)) {
if (!methodCallExpr.getScope().isPresent()) {
methodCallExpr.setScope(new NameExpr("drools"));
}
if (knowledgeHelperMethods.contains(methodCallExpr.getNameAsString())) {
methodCallExpr.setScope(asKnoledgeHelperExpression);
} else if (methodCallExpr.getNameAsString().equals("update")) {
updateExprs.add(methodCallExpr);
} else if (methodCallExpr.getNameAsString().equals("retract")) {
methodCallExpr.setName(new SimpleName("delete"));
}
requireDrools.set(true);
}
}
for (MethodCallExpr updateExpr : updateExprs) {
Expression argExpr = updateExpr.getArgument(0);
if (argExpr instanceof NameExpr) {
String updatedVar = ((NameExpr) argExpr).getNameAsString();
Class<?> updatedClass = context.getDeclarationById(updatedVar).map(DeclarationSpec::getDeclarationClass).orElseThrow(RuntimeException::new);
MethodCallExpr bitMaskCreation = new MethodCallExpr(new NameExpr(BitMask.class.getCanonicalName()), "getPatternMask");
bitMaskCreation.addArgument(new ClassExpr(JavaParser.parseClassOrInterfaceType(updatedClass.getCanonicalName())));
methodCallExprs.subList(0, methodCallExprs.indexOf(updateExpr)).stream().filter(mce -> mce.getScope().isPresent() && hasScope(mce, updatedVar)).map(mce -> ClassUtils.setter2property(mce.getNameAsString())).filter(Objects::nonNull).distinct().forEach(s -> bitMaskCreation.addArgument(new StringLiteralExpr(s)));
VariableDeclarationExpr bitMaskVar = new VariableDeclarationExpr(BITMASK_TYPE, "mask_" + updatedVar, Modifier.FINAL);
AssignExpr bitMaskAssign = new AssignExpr(bitMaskVar, bitMaskCreation, AssignExpr.Operator.ASSIGN);
ruleBlock.addStatement(bitMaskAssign);
updateExpr.addArgument("mask_" + updatedVar);
}
}
return requireDrools.get();
}
use of org.drools.javaparser.ast.expr.VariableDeclarationExpr in project drools by kiegroup.
the class ModelGenerator method addUnitData.
private static void addUnitData(String unitVar, Class<?> type, BlockStmt ruleBlock) {
Type declType = classToReferenceType(type);
ClassOrInterfaceType varType = JavaParser.parseClassOrInterfaceType(UnitData.class.getCanonicalName());
varType.setTypeArguments(declType);
VariableDeclarationExpr var_ = new VariableDeclarationExpr(varType, toVar(unitVar), Modifier.FINAL);
MethodCallExpr unitDataCall = new MethodCallExpr(null, UNIT_DATA_CALL);
unitDataCall.addArgument(new ClassExpr(declType));
unitDataCall.addArgument(new StringLiteralExpr(unitVar));
AssignExpr var_assign = new AssignExpr(var_, unitDataCall, AssignExpr.Operator.ASSIGN);
ruleBlock.addStatement(var_assign);
}
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