Examples with MVELCompilationUnit org.drools.core.base.mvel.MVELCompilationUnit used on opensource projects

Example 16 with MVELCompilationUnit

use of org.drools.core.base.mvel.MVELCompilationUnit in project drools by kiegroup.

the class MVELEnabledBuilder method build.

public void build(RuleBuildContext context) {
    // pushing consequence LHS into the stack for variable resolution
    context.getDeclarationResolver().pushOnBuildStack(context.getRule().getLhs());
    try {
        // This builder is re-usable in other dialects, so specify by name
        MVELDialect dialect = (MVELDialect) context.getDialect("mvel");
        Map<String, Class<?>> otherVars = new HashMap<String, Class<?>>();
        otherVars.put("rule", RuleImpl.class);
        Map<String, Declaration> declrs = context.getDeclarationResolver().getDeclarations(context.getRule());
        AnalysisResult analysis = dialect.analyzeExpression(context, context.getRuleDescr(), context.getRuleDescr().getEnabled(), new BoundIdentifiers(DeclarationScopeResolver.getDeclarationClasses(declrs), context), otherVars);
        final BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();
        int i = usedIdentifiers.getDeclrClasses().keySet().size();
        Declaration[] previousDeclarations = new Declaration[i];
        i = 0;
        for (String id : usedIdentifiers.getDeclrClasses().keySet()) {
            previousDeclarations[i++] = declrs.get(id);
        }
        Arrays.sort(previousDeclarations, SortDeclarations.instance);
        String exprStr = context.getRuleDescr().getEnabled();
        exprStr = exprStr.substring(1, exprStr.length() - 1) + " ";
        MVELCompilationUnit unit = dialect.getMVELCompilationUnit(exprStr, analysis, previousDeclarations, null, otherVars, context, "drools", KnowledgeHelper.class, false, MVELCompilationUnit.Scope.EXPRESSION);
        MVELEnabledExpression expr = new MVELEnabledExpression(unit, dialect.getId());
        context.getRule().setEnabled(KiePolicyHelper.isPolicyEnabled() ? new SafeEnabled(expr) : expr);
        MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
        data.addCompileable(context.getRule(), expr);
        expr.compile(data, context.getRule());
    } catch (final Exception e) {
        DialectUtil.copyErrorLocation(e, context.getRuleDescr());
        context.addError(new DescrBuildError(context.getParentDescr(), context.getRuleDescr(), null, "Unable to build expression for 'enabled' : " + e.getMessage() + " '" + context.getRuleDescr().getEnabled() + "'"));
    }
}

Example 17 with MVELCompilationUnit

use of org.drools.core.base.mvel.MVELCompilationUnit in project drools by kiegroup.

the class MVELObjectExpressionBuilder method build.

public static MVELObjectExpression build(String expression, RuleBuildContext context) {
    boolean typesafe = context.isTypesafe();
    // pushing consequence LHS into the stack for variable resolution
    context.getDeclarationResolver().pushOnBuildStack(context.getRule().getLhs());
    try {
        // This builder is re-usable in other dialects, so specify by name
        MVELDialect dialect = (MVELDialect) context.getDialect("mvel");
        Map<String, Declaration> decls = context.getDeclarationResolver().getDeclarations(context.getRule());
        MVELAnalysisResult analysis = (MVELAnalysisResult) dialect.analyzeExpression(context, context.getRuleDescr(), expression, new BoundIdentifiers(DeclarationScopeResolver.getDeclarationClasses(decls), context));
        context.setTypesafe(analysis.isTypesafe());
        final BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();
        int i = usedIdentifiers.getDeclrClasses().keySet().size();
        Declaration[] previousDeclarations = new Declaration[i];
        i = 0;
        for (String id : usedIdentifiers.getDeclrClasses().keySet()) {
            previousDeclarations[i++] = decls.get(id);
        }
        Arrays.sort(previousDeclarations, RuleTerminalNode.SortDeclarations.instance);
        MVELCompilationUnit unit = dialect.getMVELCompilationUnit(expression, analysis, previousDeclarations, null, null, context, "drools", KnowledgeHelper.class, false, MVELCompilationUnit.Scope.EXPRESSION);
        MVELObjectExpression expr = new MVELObjectExpression(unit, dialect.getId());
        MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
        data.addCompileable(context.getRule(), expr);
        expr.compile(data);
        return expr;
    } catch (final Exception e) {
        DialectUtil.copyErrorLocation(e, context.getRuleDescr());
        context.addError(new DescrBuildError(context.getParentDescr(), context.getRuleDescr(), null, "Unable to build expression : " + e.getMessage() + "'" + expression + "'"));
        return null;
    } finally {
        context.setTypesafe(typesafe);
    }
}