@SuppressWarnings("unchecked")
  public RuleConditionElement build(
      final RuleBuildContext context, final BaseDescr descr, final Pattern prefixPattern) {
    try {
      final AccumulateDescr accumDescr = (AccumulateDescr) descr;

      if (!accumDescr.hasValidInput()) {
        return null;
      }

      final RuleConditionBuilder builder =
          (RuleConditionBuilder) context.getDialect().getBuilder(accumDescr.getInput().getClass());

      Declaration[] previousDeclarations =
          (Declaration[])
              context
                  .getDeclarationResolver()
                  .getDeclarations(context.getRule())
                  .values()
                  .toArray(
                      new Declaration
                          [context
                              .getDeclarationResolver()
                              .getDeclarations(context.getRule())
                              .size()]);

      // create source CE
      final RuleConditionElement source = builder.build(context, accumDescr.getInput());

      if (source == null) {
        return null;
      }

      MVELDialect dialect = (MVELDialect) context.getDialect();

      final Declaration[] sourceDeclArr =
          (Declaration[])
              source
                  .getOuterDeclarations()
                  .values()
                  .toArray(new Declaration[source.getOuterDeclarations().size()]);

      Accumulator accumulator = null;
      Declaration[] declarations = null;

      if (accumDescr.isExternalFunction()) {
        // build an external function executor
        AccumulateFunction function =
            context.getConfiguration().getAccumulateFunction(accumDescr.getFunctionIdentifier());

        if (function == null) {
          context
              .getErrors()
              .add(
                  new DescrBuildError(
                      accumDescr,
                      context.getRuleDescr(),
                      null,
                      "Unknown accumulate function: '"
                          + accumDescr.getFunctionIdentifier()
                          + "' on rule '"
                          + context.getRuleDescr().getName()
                          + "'. All accumulate functions must be registered before building a resource."));
          return null;
        }

        Map<String, Class<?>> declarationsMap =
            context.getDeclarationResolver().getDeclarationClasses(context.getRule());
        final Dialect.AnalysisResult analysis =
            dialect.analyzeExpression(
                context,
                accumDescr,
                accumDescr.getExpression(),
                new Map[] {declarationsMap, context.getPackageBuilder().getGlobals()});

        MVELCompilationUnit unit =
            dialect.getMVELCompilationUnit(
                (String) accumDescr.getExpression(),
                analysis,
                previousDeclarations,
                (Declaration[])
                    source
                        .getOuterDeclarations()
                        .values()
                        .toArray(new Declaration[source.getOuterDeclarations().size()]),
                null,
                context);

        accumulator = new MVELAccumulatorFunctionExecutor(unit, function);
      } else {
        // it is a custom accumulate
        Map<String, Class<?>> declarationsMap =
            context.getDeclarationResolver().getDeclarationClasses(context.getRule());
        final MVELAnalysisResult initCodeAnalysis =
            (MVELAnalysisResult)
                dialect.analyzeBlock(
                    context,
                    accumDescr,
                    accumDescr.getInitCode(),
                    new Map[] {declarationsMap, context.getPackageBuilder().getGlobals()});

        final MVELAnalysisResult actionCodeAnalysis =
            (MVELAnalysisResult)
                dialect.analyzeBlock(
                    context,
                    accumDescr,
                    null,
                    accumDescr.getActionCode(),
                    new Map[] {declarationsMap, context.getPackageBuilder().getGlobals()},
                    initCodeAnalysis.getMvelVariables());

        final MVELAnalysisResult resultCodeAnalysis =
            (MVELAnalysisResult)
                dialect.analyzeExpression(
                    context,
                    accumDescr,
                    accumDescr.getResultCode(),
                    new Map[] {declarationsMap, context.getPackageBuilder().getGlobals()},
                    initCodeAnalysis.getMvelVariables());

        Dialect.AnalysisResult reverseCodeAnalysis = null;
        if (accumDescr.getReverseCode() != null) {
          reverseCodeAnalysis =
              dialect.analyzeBlock(
                  context,
                  accumDescr,
                  null,
                  accumDescr.getActionCode(),
                  new Map[] {declarationsMap, context.getPackageBuilder().getGlobals()},
                  initCodeAnalysis.getMvelVariables());
        }

        MVELCompilationUnit initUnit =
            dialect.getMVELCompilationUnit(
                (String) accumDescr.getInitCode(),
                initCodeAnalysis,
                previousDeclarations,
                (Declaration[])
                    source
                        .getOuterDeclarations()
                        .values()
                        .toArray(new Declaration[source.getOuterDeclarations().size()]),
                null,
                context);

        MVELCompilationUnit actionUnit =
            dialect.getMVELCompilationUnit(
                (String) accumDescr.getActionCode(),
                actionCodeAnalysis,
                previousDeclarations,
                (Declaration[])
                    source
                        .getOuterDeclarations()
                        .values()
                        .toArray(new Declaration[source.getOuterDeclarations().size()]),
                initCodeAnalysis.getMvelVariables(),
                context);

        MVELCompilationUnit reverseUnit = null;
        if (accumDescr.getReverseCode() != null) {
          reverseUnit =
              dialect.getMVELCompilationUnit(
                  (String) accumDescr.getReverseCode(),
                  reverseCodeAnalysis,
                  previousDeclarations,
                  (Declaration[])
                      source
                          .getOuterDeclarations()
                          .values()
                          .toArray(new Declaration[source.getOuterDeclarations().size()]),
                  initCodeAnalysis.getMvelVariables(),
                  context);
        }

        MVELCompilationUnit resultUnit =
            dialect.getMVELCompilationUnit(
                (String) accumDescr.getResultCode(),
                resultCodeAnalysis,
                previousDeclarations,
                (Declaration[])
                    source
                        .getOuterDeclarations()
                        .values()
                        .toArray(new Declaration[source.getOuterDeclarations().size()]),
                initCodeAnalysis.getMvelVariables(),
                context);

        if (reverseUnit != null) {
          Set<String> shadow = new HashSet<String>(source.getOuterDeclarations().keySet());
          shadow.retainAll(reverseCodeAnalysis.getNotBoundedIdentifiers());
          shadow.addAll(reverseCodeAnalysis.getBoundIdentifiers()[0]);

          String[] shadowVars = (String[]) shadow.toArray(new String[shadow.size()]);

          actionUnit.setShadowIdentifiers(shadowVars);
          reverseUnit.setShadowIdentifiers(shadowVars);
        }

        accumulator = new MVELAccumulator(initUnit, actionUnit, reverseUnit, resultUnit);
      }

      final Accumulate accumulate =
          new Accumulate(source, declarations, sourceDeclArr, new Accumulator[] {accumulator});

      MVELDialectRuntimeData data =
          (MVELDialectRuntimeData)
              context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
      data.addCompileable(accumulate, (MVELCompileable) accumulator);

      ((MVELCompileable) accumulator).compile(context.getPackageBuilder().getRootClassLoader());

      return accumulate;
    } catch (Exception e) {
      context
          .getErrors()
          .add(
              new DescrBuildError(
                  context.getParentDescr(),
                  descr,
                  e,
                  "Unable to build expression for 'accumulate' : " + e.getMessage()));
      return null;
    }
  }
  public RuleConditionElement build(
      final RuleBuildContext context, final BaseDescr descr, final Pattern prefixPattern) {

    final AccumulateDescr accumDescr = (AccumulateDescr) descr;

    if (!accumDescr.hasValidInput()) {
      return null;
    }

    final RuleConditionBuilder builder =
        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();

    final Declaration[] sourceDeclArr =
        (Declaration[]) source.getOuterDeclarations().values().toArray(new Declaration[0]);

    Accumulator accumulator = null;
    Declaration[] declarations = null;

    if (accumDescr.isExternalFunction()) {
      // build an external function executor
      final Dialect.AnalysisResult analysis =
          dialect.analyzeExpression(
              context,
              accumDescr,
              accumDescr.getExpression(),
              new Set[] {
                context.getDeclarationResolver().getDeclarations().keySet(),
                context.getPkg().getGlobals().keySet()
              });

      int size = analysis.getBoundIdentifiers()[0].size();
      declarations = new Declaration[size];
      for (int i = 0; i < size; i++) {
        declarations[i] =
            context
                .getDeclarationResolver()
                .getDeclaration((String) analysis.getBoundIdentifiers()[0].get(i));
      }

      final Serializable expression =
          dialect.compile(
              (String) accumDescr.getExpression(),
              analysis,
              null,
              source.getOuterDeclarations(),
              null,
              context);

      AccumulateFunction function =
          context.getConfiguration().getAccumulateFunction(accumDescr.getFunctionIdentifier());

      final DroolsMVELFactory factory =
          new DroolsMVELFactory(
              context.getDeclarationResolver().getDeclarations(),
              source.getOuterDeclarations(),
              context.getPkg().getGlobals());

      MVELDialectRuntimeData data =
          (MVELDialectRuntimeData)
              context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
      factory.setNextFactory(data.getFunctionFactory());

      accumulator = new MVELAccumulatorFunctionExecutor(factory, expression, function);
    } else {
      // it is a custom accumulate
      final MVELAnalysisResult initCodeAnalysis =
          (MVELAnalysisResult)
              dialect.analyzeBlock(
                  context,
                  accumDescr,
                  accumDescr.getInitCode(),
                  new Set[] {
                    context.getDeclarationResolver().getDeclarations().keySet(),
                    context.getPkg().getGlobals().keySet()
                  });

      final MVELAnalysisResult actionCodeAnalysis =
          (MVELAnalysisResult)
              dialect.analyzeBlock(
                  context,
                  accumDescr,
                  null,
                  accumDescr.getActionCode(),
                  new Set[] {
                    context.getDeclarationResolver().getDeclarations().keySet(),
                    context.getPkg().getGlobals().keySet()
                  },
                  initCodeAnalysis.getMvelVariables());
      // actionCodeAnalysis.setMvelVariables( initCodeAnalysis.getMvelVariables() );
      final MVELAnalysisResult resultCodeAnalysis =
          (MVELAnalysisResult)
              dialect.analyzeExpression(
                  context,
                  accumDescr,
                  accumDescr.getResultCode(),
                  new Set[] {
                    context.getDeclarationResolver().getDeclarations().keySet(),
                    context.getPkg().getGlobals().keySet()
                  },
                  initCodeAnalysis.getMvelVariables());
      // resultCodeAnalysis.setMvelVariables( initCodeAnalysis.getMvelVariables() );

      final List requiredDeclarations = new ArrayList(initCodeAnalysis.getBoundIdentifiers()[0]);
      requiredDeclarations.addAll(actionCodeAnalysis.getBoundIdentifiers()[0]);
      requiredDeclarations.addAll(resultCodeAnalysis.getBoundIdentifiers()[0]);

      Dialect.AnalysisResult reverseCodeAnalysis = null;
      if (accumDescr.getReverseCode() != null) {
        reverseCodeAnalysis =
            context
                .getDialect()
                .analyzeBlock(
                    context,
                    accumDescr,
                    accumDescr.getActionCode(),
                    new Set[] {
                      context.getDeclarationResolver().getDeclarations().keySet(),
                      context.getPkg().getGlobals().keySet()
                    });
        requiredDeclarations.addAll(reverseCodeAnalysis.getBoundIdentifiers()[0]);
      }

      declarations = new Declaration[requiredDeclarations.size()];
      for (int i = 0, size = requiredDeclarations.size(); i < size; i++) {
        declarations[i] =
            context.getDeclarationResolver().getDeclaration((String) requiredDeclarations.get(i));
      }

      final Serializable init =
          dialect.compile(
              (String) accumDescr.getInitCode(),
              initCodeAnalysis,
              null,
              source.getOuterDeclarations(),
              null,
              context);
      final Serializable action =
          dialect.compile(
              (String) accumDescr.getActionCode(),
              actionCodeAnalysis,
              null,
              source.getOuterDeclarations(),
              initCodeAnalysis.getMvelVariables(),
              context);

      Serializable reverse = null;
      if (accumDescr.getReverseCode() != null) {
        reverse =
            dialect.compile(
                (String) accumDescr.getReverseCode(),
                resultCodeAnalysis,
                null,
                source.getOuterDeclarations(),
                initCodeAnalysis.getMvelVariables(),
                context);
      }

      final Serializable result =
          dialect.compile(
              (String) accumDescr.getResultCode(),
              resultCodeAnalysis,
              null,
              source.getOuterDeclarations(),
              initCodeAnalysis.getMvelVariables(),
              context);

      DroolsMVELFactory factory = null;
      if (reverse == null) {
        // does not support reverse, so create a regular factory
        factory =
            new DroolsMVELFactory(
                context.getDeclarationResolver().getDeclarations(),
                source.getOuterDeclarations(),
                context.getPkg().getGlobals());
      } else {
        Set<String> shadow = new HashSet<String>(source.getOuterDeclarations().keySet());
        shadow.retainAll(reverseCodeAnalysis.getNotBoundedIdentifiers());
        shadow.addAll(reverseCodeAnalysis.getBoundIdentifiers()[0]);

        // supports reverse, so create a shadowing factory
        factory =
            new DroolsMVELShadowFactory(
                context.getDeclarationResolver().getDeclarations(),
                source.getOuterDeclarations(),
                context.getPkg().getGlobals(),
                shadow);
      }

      MVELDialectRuntimeData data =
          (MVELDialectRuntimeData)
              context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
      factory.setNextFactory(data.getFunctionFactory());

      accumulator = new MVELAccumulator(factory, init, action, reverse, result);
    }

    final Accumulate accumulate = new Accumulate(source, declarations, sourceDeclArr, accumulator);
    return accumulate;
  }
Exemplo n.º 3
0
  @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 =
          context.getDeclarationResolver().getDeclarationClasses(decls);
      declarationClasses.putAll(
          context.getDeclarationResolver().getDeclarationClasses(sourceOuterDeclr));

      BoundIdentifiers boundIds =
          new BoundIdentifiers(declarationClasses, context.getPackageBuilder().getGlobals());
      boundIds.setDeclarations(mergedDecl);

      Accumulator[] accumulators = null;

      final boolean readLocalsFromTuple =
          PackageBuilderUtil.isReadLocalsFromTuple(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,
                source,
                dialect,
                decls,
                sourceOuterDeclr,
                boundIds,
                readLocalsFromTuple);
      }

      final Accumulate accumulate =
          new Accumulate(source, null, accumulators, accumDescr.isMultiFunction());

      MVELDialectRuntimeData data =
          (MVELDialectRuntimeData)
              context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
      int index = 0;
      for (Accumulator accumulator : accumulators) {
        data.addCompileable(accumulate.new Wirer(index++), (MVELCompileable) accumulator);
        ((MVELCompileable) accumulator).compile(data);
      }

      return accumulate;
    } catch (Exception e) {
      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);
    }
  }