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Example 1 with AppendEvaluator

use of org.apache.nifi.attribute.expression.language.evaluation.functions.AppendEvaluator in project nifi by apache.

the class ExpressionCompiler method newStringLiteralEvaluator.

private Evaluator<String> newStringLiteralEvaluator(final String literalValue) {
    if (literalValue == null || literalValue.length() < 2) {
        return addToken(new StringLiteralEvaluator(literalValue), literalValue);
    }
    final List<Range> ranges = Query.extractExpressionRanges(literalValue);
    if (ranges.isEmpty()) {
        return addToken(new StringLiteralEvaluator(literalValue), literalValue);
    }
    final List<Evaluator<?>> evaluators = new ArrayList<>();
    int lastIndex = 0;
    for (final Range range : ranges) {
        if (range.getStart() > lastIndex) {
            evaluators.add(newStringLiteralEvaluator(literalValue.substring(lastIndex, range.getStart())));
        }
        final String treeText = literalValue.substring(range.getStart(), range.getEnd() + 1);
        evaluators.add(buildEvaluator(compileTree(treeText)));
        lastIndex = range.getEnd() + 1;
    }
    final Range lastRange = ranges.get(ranges.size() - 1);
    if (lastRange.getEnd() + 1 < literalValue.length()) {
        final String treeText = literalValue.substring(lastRange.getEnd() + 1);
        evaluators.add(newStringLiteralEvaluator(treeText));
    }
    if (evaluators.size() == 1) {
        return toStringEvaluator(evaluators.get(0));
    }
    Evaluator<String> lastEvaluator = toStringEvaluator(evaluators.get(0));
    for (int i = 1; i < evaluators.size(); i++) {
        lastEvaluator = new AppendEvaluator(lastEvaluator, toStringEvaluator(evaluators.get(i)));
    }
    this.evaluators.addAll(evaluators);
    return lastEvaluator;
}
Also used : StringLiteralEvaluator(org.apache.nifi.attribute.expression.language.evaluation.literals.StringLiteralEvaluator) ArrayList(java.util.ArrayList) AppendEvaluator(org.apache.nifi.attribute.expression.language.evaluation.functions.AppendEvaluator) Range(org.apache.nifi.attribute.expression.language.Query.Range) IfElseEvaluator(org.apache.nifi.attribute.expression.language.evaluation.functions.IfElseEvaluator) OrEvaluator(org.apache.nifi.attribute.expression.language.evaluation.functions.OrEvaluator) GreaterThanEvaluator(org.apache.nifi.attribute.expression.language.evaluation.functions.GreaterThanEvaluator) LastIndexOfEvaluator(org.apache.nifi.attribute.expression.language.evaluation.functions.LastIndexOfEvaluator) UrlEncodeEvaluator(org.apache.nifi.attribute.expression.language.evaluation.functions.UrlEncodeEvaluator) IteratingEvaluator(org.apache.nifi.attribute.expression.language.evaluation.selection.IteratingEvaluator) 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Aggregations

ArrayList (java.util.ArrayList)1 Range (org.apache.nifi.attribute.expression.language.Query.Range)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 AppendEvaluator (org.apache.nifi.attribute.expression.language.evaluation.functions.AppendEvaluator)1 Base64DecodeEvaluator (org.apache.nifi.attribute.expression.language.evaluation.functions.Base64DecodeEvaluator)1 Base64EncodeEvaluator (org.apache.nifi.attribute.expression.language.evaluation.functions.Base64EncodeEvaluator)1 CharSequenceTranslatorEvaluator (org.apache.nifi.attribute.expression.language.evaluation.functions.CharSequenceTranslatorEvaluator)1 ContainsEvaluator (org.apache.nifi.attribute.expression.language.evaluation.functions.ContainsEvaluator)1 DivideEvaluator (org.apache.nifi.attribute.expression.language.evaluation.functions.DivideEvaluator)1 EndsWithEvaluator (org.apache.nifi.attribute.expression.language.evaluation.functions.EndsWithEvaluator)1