/*
* 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.hl7.query.evaluator.comparison;
import java.util.regex.Pattern;
import org.apache.nifi.hl7.query.evaluator.Evaluator;
public abstract class AbstractNumericComparison extends AbstractComparisonEvaluator {
private static final Pattern NUMERIC_PATTERN = Pattern.compile("\\d+(\\.\\d+)?");
public AbstractNumericComparison(final Evaluator<?> lhs, final Evaluator<?> rhs) {
super(lhs, rhs);
}
@Override
protected final boolean compare(final Object lhs, final Object rhs) {
final Double lhsDouble = toDouble(lhs);
if (lhsDouble == null) {
return false;
}
final Double rhsDouble = toDouble(rhs);
if (rhsDouble == null) {
return false;
}
return compareNumbers(lhsDouble, rhsDouble);
}
private Double toDouble(final Object value) {
if (value == null) {
return null;
}
if (value instanceof Double) {
return (Double) value;
}
if (value instanceof Number) {
return ((Number) value).doubleValue();
}
if (value instanceof String) {
if (NUMERIC_PATTERN.matcher((String) value).matches()) {
return Double.parseDouble((String) value);
}
}
return null;
}
protected abstract boolean compareNumbers(final Double lhs, final Double rhs);
}