/*
* 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.Collection;
import java.util.List;
import java.util.Map;
import org.apache.nifi.hl7.model.HL7Component;
import org.apache.nifi.hl7.model.HL7Message;
import org.apache.nifi.hl7.model.HL7Segment;
import org.apache.nifi.hl7.query.evaluator.Evaluator;
import org.apache.nifi.hl7.query.evaluator.IntegerEvaluator;
public class DotEvaluator implements Evaluator<Object> {
private final Evaluator<?> lhs;
private final IntegerEvaluator rhs;
public DotEvaluator(final Evaluator<?> lhs, final IntegerEvaluator rhs) {
this.lhs = lhs;
this.rhs = rhs;
}
@Override
public Object evaluate(final Map<String, Object> objectMap) {
final Object lhsValue = this.lhs.evaluate(objectMap);
final Integer rhsValue = this.rhs.evaluate(objectMap);
if (lhsValue == null || rhsValue == null) {
return null;
}
final List<Object> results = new ArrayList<>();
if (lhsValue instanceof Collection) {
final Collection<?> lhsCollection = (Collection<?>) lhsValue;
for (final Object obj : lhsCollection) {
final Object val = getValue(obj, rhsValue);
results.add(val);
}
} else {
final Object val = getValue(lhsValue, rhsValue);
return val;
}
return results;
}
private Object getValue(final Object lhsValue, final int rhsValue) {
final List<?> list;
if (lhsValue instanceof HL7Message) {
list = ((HL7Message) lhsValue).getSegments();
} else if (lhsValue instanceof HL7Segment) {
list = ((HL7Segment) lhsValue).getFields();
} else if (lhsValue instanceof HL7Component) {
list = ((HL7Component) lhsValue).getComponents();
} else {
return null;
}
if (rhsValue > list.size()) {
return null;
}
// convert from 0-based to 1-based
return list.get(rhsValue - 1);
}
@Override
public Class<? extends Object> getType() {
return Object.class;
}
}