Examples with MethodDeclaration org.drools.javaparser.ast.body.MethodDeclaration used on opensource projects

Example 6 with MethodDeclaration

use of org.drools.javaparser.ast.body.MethodDeclaration 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();
}

Example 7 with MethodDeclaration

use of org.drools.javaparser.ast.body.MethodDeclaration in project drools by kiegroup.

the class PatternVisitor method visit.

public DSLNode visit(PatternDescr pattern) {
    String className = pattern.getObjectType();
    List<? extends BaseDescr> constraintDescrs = pattern.getConstraint().getDescrs();
    String queryName = "query_" + pattern.getObjectType();
    final MethodDeclaration queryMethod = packageModel.getQueryMethod(queryName);
    // Expression is a query, get bindings from query parameter type
    if (queryMethod != null) {
        return new Query(context, packageModel, pattern, constraintDescrs, queryName);
    }
    String queryDef = toQueryDef(pattern.getObjectType());
    if (packageModel.getQueryDefWithType().containsKey(queryDef)) {
        return new QueryCall(context, packageModel, pattern, queryDef);
    }
    if (pattern.getIdentifier() == null && pattern.getObjectType().equals("Object") && pattern.getSource() instanceof AccumulateDescr) {
        if (context.isPatternDSL()) {
            return new PatternAccumulateConstraint(context, packageModel, pattern, ((AccumulateDescr) pattern.getSource()), constraintDescrs);
        } else {
            return new FlowAccumulateConstraint(context, packageModel, pattern, ((AccumulateDescr) pattern.getSource()), constraintDescrs);
        }
    }
    final boolean allConstraintsPositional = areAllConstraintsPositional(constraintDescrs);
    final Class<?> patternType = getClassFromContext(context.getTypeResolver(), className);
    if (context.isPatternDSL()) {
        return new PatternDSLPattern(context, packageModel, pattern, constraintDescrs, patternType, allConstraintsPositional);
    } else {
        return new FlowDSLPattern(context, packageModel, pattern, constraintDescrs, patternType, allConstraintsPositional);
    }
}

Example 8 with MethodDeclaration

use of org.drools.javaparser.ast.body.MethodDeclaration in project drools by kiegroup.

the class PackageModel method getRulesSource.

public RuleSourceResult getRulesSource() {
    CompilationUnit cu = new CompilationUnit();
    cu.setPackageDeclaration(name);
    manageImportForCompilationUnit(cu);
    ClassOrInterfaceDeclaration rulesClass = cu.addClass(rulesFileName);
    rulesClass.addImplementedType(Model.class);
    BodyDeclaration<?> dateFormatter = JavaParser.parseBodyDeclaration("public final static DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(DateUtils.getDateFormatMask());\n");
    rulesClass.addMember(dateFormatter);
    BodyDeclaration<?> getNameMethod = JavaParser.parseBodyDeclaration("    @Override\n" + "        public String getName() {\n" + "        return \"" + name + "\";\n" + "    }\n");
    rulesClass.addMember(getNameMethod);
    BodyDeclaration<?> getRulesMethod = JavaParser.parseBodyDeclaration("    @Override\n" + "    public List<Rule> getRules() {\n" + "        return rules;\n" + "    }\n");
    rulesClass.addMember(getRulesMethod);
    StringBuilder sb = new StringBuilder("\n");
    sb.append("With the following expression ID:\n");
    sb.append(exprIdGenerator.toString());
    sb.append("\n");
    JavadocComment exprIdComment = new JavadocComment(sb.toString());
    getRulesMethod.setComment(exprIdComment);
    BodyDeclaration<?> getGlobalsMethod = JavaParser.parseBodyDeclaration("    @Override\n" + "    public List<Global> getGlobals() {\n" + "        return globals;\n" + "    }\n");
    rulesClass.addMember(getGlobalsMethod);
    BodyDeclaration<?> getQueriesMethod = JavaParser.parseBodyDeclaration("    @Override\n" + "    public List<Query> getQueries() {\n" + "        return queries;\n" + "    }\n");
    rulesClass.addMember(getQueriesMethod);
    BodyDeclaration<?> getTypeMetaDataMethod = JavaParser.parseBodyDeclaration("    @Override\n" + "    public List<TypeMetaData> getTypeMetaDatas() {\n" + "        return typeMetaDatas;\n" + "    }\n");
    rulesClass.addMember(getTypeMetaDataMethod);
    for (Map.Entry<String, MethodCallExpr> windowReference : windowReferences.entrySet()) {
        FieldDeclaration f = rulesClass.addField(WINDOW_REFERENCE_TYPE, windowReference.getKey(), Modifier.PUBLIC, Modifier.STATIC, Modifier.FINAL);
        f.getVariables().get(0).setInitializer(windowReference.getValue());
    }
    for (Map.Entry<String, Class<?>> g : getGlobals().entrySet()) {
        addGlobalField(rulesClass, getName(), g.getKey(), g.getValue());
    }
    for (Map.Entry<String, QueryGenerator.QueryDefWithType> queryDef : queryDefWithType.entrySet()) {
        FieldDeclaration field = rulesClass.addField(queryDef.getValue().getQueryType(), queryDef.getKey(), Modifier.PUBLIC, Modifier.STATIC, Modifier.FINAL);
        field.getVariables().get(0).setInitializer(queryDef.getValue().getMethodCallExpr());
    }
    for (Map.Entry<String, MethodDeclaration> methodName : queryMethods.entrySet()) {
        FieldDeclaration field = rulesClass.addField(methodName.getValue().getType(), methodName.getKey(), Modifier.FINAL);
        field.getVariables().get(0).setInitializer(new MethodCallExpr(null, methodName.getKey()));
    }
    // instance initializer block.
    // add to `rules` list the result of invoking each method for rule
    InitializerDeclaration rulesListInitializer = new InitializerDeclaration();
    BlockStmt rulesListInitializerBody = new BlockStmt();
    rulesListInitializer.setBody(rulesListInitializerBody);
    queryMethods.values().forEach(rulesClass::addMember);
    buildArtifactsDeclaration(queryMethods.keySet(), rulesClass, rulesListInitializerBody, "Query", "queries", false);
    buildArtifactsDeclaration(windowReferences.keySet(), rulesClass, rulesListInitializerBody, "WindowReference", "windowReferences", false);
    buildArtifactsDeclaration(getGlobals().keySet(), rulesClass, rulesListInitializerBody, "Global", "globals", true);
    if (!typeMetaDataExpressions.isEmpty()) {
        BodyDeclaration<?> typeMetaDatasList = JavaParser.parseBodyDeclaration("List<TypeMetaData> typeMetaDatas = new ArrayList<>();");
        rulesClass.addMember(typeMetaDatasList);
        for (Expression expr : typeMetaDataExpressions) {
            addInitStatement(rulesListInitializerBody, expr, "typeMetaDatas");
        }
    } else {
        BodyDeclaration<?> typeMetaDatasList = JavaParser.parseBodyDeclaration("List<TypeMetaData> typeMetaDatas = Collections.emptyList();");
        rulesClass.addMember(typeMetaDatasList);
    }
    functions.forEach(rulesClass::addMember);
    RuleSourceResult results = new RuleSourceResult(cu);
    int ruleCount = ruleMethods.size();
    boolean requiresMultipleRulesLists = ruleCount >= RULES_DECLARATION_PER_CLASS - 1;
    MethodCallExpr rules = buildRulesField(rulesClass);
    if (requiresMultipleRulesLists) {
        addRulesList(rulesListInitializerBody, "rulesList");
    }
    // each method per Drlx parser result
    int count = -1;
    Map<Integer, ClassOrInterfaceDeclaration> splitted = new LinkedHashMap<>();
    for (Entry<String, MethodDeclaration> ruleMethodKV : ruleMethods.entrySet()) {
        ClassOrInterfaceDeclaration rulesMethodClass = splitted.computeIfAbsent(++count / RULES_PER_CLASS, i -> {
            CompilationUnit cuRulesMethod = new CompilationUnit();
            results.with(cuRulesMethod);
            cuRulesMethod.setPackageDeclaration(name);
            manageImportForCompilationUnit(cuRulesMethod);
            cuRulesMethod.addImport(JavaParser.parseImport("import static " + name + "." + rulesFileName + ".*;"));
            String currentRulesMethodClassName = rulesFileName + "RuleMethods" + i;
            return cuRulesMethod.addClass(currentRulesMethodClassName);
        });
        rulesMethodClass.addMember(ruleMethodKV.getValue());
        if (count % RULES_DECLARATION_PER_CLASS == RULES_DECLARATION_PER_CLASS - 1) {
            int index = count / RULES_DECLARATION_PER_CLASS;
            rules = buildRulesField(results, index);
            addRulesList(rulesListInitializerBody, rulesFileName + "Rules" + index + ".rulesList");
        }
        // manage in main class init block:
        rules.addArgument(new MethodCallExpr(new NameExpr(rulesMethodClass.getNameAsString()), ruleMethodKV.getKey()));
    }
    BodyDeclaration<?> rulesList = requiresMultipleRulesLists ? JavaParser.parseBodyDeclaration("List<Rule> rules = new ArrayList<>(" + ruleCount + ");") : JavaParser.parseBodyDeclaration("List<Rule> rules = rulesList;");
    rulesClass.addMember(rulesList);
    if (!rulesListInitializer.getBody().getStatements().isEmpty()) {
        rulesClass.addMember(rulesListInitializer);
    }
    return results;
}

Example 9 with MethodDeclaration

use of org.drools.javaparser.ast.body.MethodDeclaration in project drools by kiegroup.

the class FunctionGenerator method toFunction.

public static MethodDeclaration toFunction(FunctionDescr desc) {
    List<Parameter> parameters = new ArrayList<>();
    List<String> parameterTypes = desc.getParameterTypes();
    for (int i = 0; i < parameterTypes.size(); i++) {
        String type = parameterTypes.get(i);
        String name = desc.getParameterNames().get(i);
        parameters.add(new Parameter(parseType(type), name));
    }
    EnumSet<Modifier> modifiers = EnumSet.of(Modifier.PUBLIC, Modifier.STATIC);
    MethodDeclaration methodDeclaration = new MethodDeclaration(modifiers, desc.getName(), parseType(desc.getReturnType()), nodeList(parameters));
    methodDeclaration.setBody(DrlxParseUtil.parseBlock(desc.getBody()));
    return methodDeclaration;
}

Example 10 with MethodDeclaration

use of org.drools.javaparser.ast.body.MethodDeclaration in project drools by kiegroup.

the class POJOGenerator method generateHashCodeMethod.

private static MethodDeclaration generateHashCodeMethod(List<Statement> hashCodeFieldStatement) {
    final Statement header = parseStatement("int result = super.hashCode();");
    NodeList<Statement> hashCodeStatements = nodeList(header);
    hashCodeStatements.addAll(hashCodeFieldStatement);
    hashCodeStatements.add(parseStatement("return result;"));
    final Type returnType = JavaParser.parseType(int.class.getSimpleName());
    final MethodDeclaration equals = new MethodDeclaration(EnumSet.of(Modifier.PUBLIC), returnType, HASH_CODE);
    equals.addAnnotation("Override");
    equals.setBody(new BlockStmt(hashCodeStatements));
    return equals;
}