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Example 1 with CompiledExpression

use of org.apache.nifi.attribute.expression.language.CompiledExpression in project nifi by apache.

the class ExpressionCompiler method compile.

public CompiledExpression compile(final String expression) {
    try {
        final CharStream input = new ANTLRStringStream(expression);
        final AttributeExpressionLexer lexer = new AttributeExpressionLexer(input);
        final CommonTokenStream lexerTokenStream = new CommonTokenStream(lexer);
        final AttributeExpressionParser parser = new AttributeExpressionParser(lexerTokenStream);
        final Tree ast = (Tree) parser.query().getTree();
        final Tree tree = ast.getChild(0);
        final Evaluator<?> evaluator = buildEvaluator(tree);
        verifyMappingEvaluatorReduced(evaluator);
        final Set<Evaluator<?>> allEvaluators = new HashSet<>(evaluators);
        this.evaluators.clear();
        return new CompiledExpression(expression, evaluator, tree, allEvaluators);
    } catch (final AttributeExpressionLanguageParsingException e) {
        throw e;
    } catch (final Exception e) {
        throw new AttributeExpressionLanguageParsingException(e);
    }
}
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Aggregations

UnknownHostException (java.net.UnknownHostException)1 HashSet (java.util.HashSet)1 ANTLRStringStream (org.antlr.runtime.ANTLRStringStream)1 CharStream (org.antlr.runtime.CharStream)1 CommonTokenStream (org.antlr.runtime.CommonTokenStream)1 Tree (org.antlr.runtime.tree.Tree)1 CompiledExpression (org.apache.nifi.attribute.expression.language.CompiledExpression)1 AttributeExpressionLexer (org.apache.nifi.attribute.expression.language.antlr.AttributeExpressionLexer)1 AttributeExpressionParser (org.apache.nifi.attribute.expression.language.antlr.AttributeExpressionParser)1 BooleanEvaluator (org.apache.nifi.attribute.expression.language.evaluation.BooleanEvaluator)1 DateEvaluator (org.apache.nifi.attribute.expression.language.evaluation.DateEvaluator)1 Evaluator (org.apache.nifi.attribute.expression.language.evaluation.Evaluator)1 StringEvaluator (org.apache.nifi.attribute.expression.language.evaluation.StringEvaluator)1 BooleanCastEvaluator (org.apache.nifi.attribute.expression.language.evaluation.cast.BooleanCastEvaluator)1 DateCastEvaluator (org.apache.nifi.attribute.expression.language.evaluation.cast.DateCastEvaluator)1 DecimalCastEvaluator (org.apache.nifi.attribute.expression.language.evaluation.cast.DecimalCastEvaluator)1 NumberCastEvaluator (org.apache.nifi.attribute.expression.language.evaluation.cast.NumberCastEvaluator)1 StringCastEvaluator (org.apache.nifi.attribute.expression.language.evaluation.cast.StringCastEvaluator)1 WholeNumberCastEvaluator (org.apache.nifi.attribute.expression.language.evaluation.cast.WholeNumberCastEvaluator)1 AndEvaluator (org.apache.nifi.attribute.expression.language.evaluation.functions.AndEvaluator)1