/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.nifi.attribute.expression.language.evaluation.cast;
import org.apache.nifi.attribute.expression.language.evaluation.DateQueryResult;
import org.apache.nifi.attribute.expression.language.evaluation.DecimalEvaluator;
import org.apache.nifi.attribute.expression.language.evaluation.DecimalQueryResult;
import org.apache.nifi.attribute.expression.language.evaluation.Evaluator;
import org.apache.nifi.attribute.expression.language.evaluation.NumberQueryResult;
import org.apache.nifi.attribute.expression.language.evaluation.QueryResult;
import org.apache.nifi.attribute.expression.language.evaluation.StringQueryResult;
import org.apache.nifi.attribute.expression.language.evaluation.WholeNumberQueryResult;
import org.apache.nifi.attribute.expression.language.evaluation.util.NumberParsing;
import org.apache.nifi.attribute.expression.language.exception.AttributeExpressionLanguageParsingException;
import org.apache.nifi.expression.AttributeExpression.ResultType;
import java.util.Map;
public class DecimalCastEvaluator extends DecimalEvaluator {
private final Evaluator<?> subjectEvaluator;
public DecimalCastEvaluator(final Evaluator<?> subjectEvaluator) {
if (subjectEvaluator.getResultType() == ResultType.BOOLEAN) {
throw new AttributeExpressionLanguageParsingException("Cannot implicitly convert Data Type " + subjectEvaluator.getResultType() + " to " + ResultType.DECIMAL);
}
this.subjectEvaluator = subjectEvaluator;
}
@Override
public QueryResult<Double> evaluate(final Map<String, String> attributes) {
final QueryResult<?> result = subjectEvaluator.evaluate(attributes);
if (result.getValue() == null) {
return new DecimalQueryResult(null);
}
switch (result.getResultType()) {
case DECIMAL:
return (DecimalQueryResult) result;
case STRING:
final String trimmed = ((StringQueryResult) result).getValue().trim();
NumberParsing.ParseResultType parseType = NumberParsing.parse(trimmed);
switch (parseType){
case DECIMAL:
return new DecimalQueryResult(Double.valueOf(trimmed));
case WHOLE_NUMBER:
Long resultValue;
try {
resultValue = Long.valueOf(trimmed);
} catch (NumberFormatException e){
// Will only occur if trimmed is a hex number
resultValue = Long.decode(trimmed);
}
return new DecimalQueryResult(resultValue.doubleValue());
case NOT_NUMBER:
default:
return new DecimalQueryResult(null);
}
case DATE:
Long timestamp = ((DateQueryResult) result).getValue().getTime();
return new DecimalQueryResult(timestamp.doubleValue());
case WHOLE_NUMBER:
final Long resultValue = ((WholeNumberQueryResult) result).getValue();
return new DecimalQueryResult(resultValue.doubleValue());
case NUMBER:
final Number numberValue = ((NumberQueryResult) result).getValue();
return new DecimalQueryResult(numberValue.doubleValue());
default:
return new DecimalQueryResult(null);
}
}
@Override
public Evaluator<?> getSubjectEvaluator() {
return subjectEvaluator;
}
}