/*
* 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.message;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.apache.nifi.hl7.model.HL7Field;
import org.apache.nifi.hl7.model.HL7Segment;
import org.apache.nifi.hl7.query.evaluator.Evaluator;
import org.apache.nifi.hl7.query.evaluator.IntegerEvaluator;
@SuppressWarnings("rawtypes")
public class FieldEvaluator implements Evaluator<List> {
private final SegmentEvaluator segmentEvaluator;
private final IntegerEvaluator indexEvaluator;
public FieldEvaluator(final SegmentEvaluator segmentEvaluator, final IntegerEvaluator indexEvaluator) {
this.segmentEvaluator = segmentEvaluator;
this.indexEvaluator = indexEvaluator;
}
public List<HL7Field> evaluate(final Map<String, Object> objectMap) {
final List<HL7Segment> segments = segmentEvaluator.evaluate(objectMap);
if (segments == null) {
return Collections.emptyList();
}
final Integer index = indexEvaluator.evaluate(objectMap);
if (index == null) {
return Collections.emptyList();
}
final List<HL7Field> fields = new ArrayList<>();
for (final HL7Segment segment : segments) {
final List<HL7Field> segmentFields = segment.getFields();
if (segmentFields.size() <= index) {
continue;
}
fields.add(segmentFields.get(index));
}
return fields;
}
public Class<? extends List> getType() {
return List.class;
}
}