HapiMessage.java

/*
 * 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.hapi;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.nifi.hl7.model.HL7Message;
import org.apache.nifi.hl7.model.HL7Segment;

import ca.uhn.hl7v2.HL7Exception;
import ca.uhn.hl7v2.model.Group;
import ca.uhn.hl7v2.model.Message;
import ca.uhn.hl7v2.model.Segment;
import ca.uhn.hl7v2.model.Structure;

public class HapiMessage implements HL7Message {

    private final Message message;
    private final List<HL7Segment> allSegments;
    private final Map<String, List<HL7Segment>> segmentMap;

    public HapiMessage(final Message message) throws HL7Exception {
        this.message = message;

        allSegments = new ArrayList<>();
        populateSegments(message, allSegments);

        segmentMap = new HashMap<>();
        for (final HL7Segment segment : allSegments) {
            final String segmentName = segment.getName();
            List<HL7Segment> segmentList = segmentMap.get(segmentName);
            if (segmentList == null) {
                segmentList = new ArrayList<>();
                segmentMap.put(segmentName, segmentList);
            }

            segmentList.add(segment);
        }
    }

    private void populateSegments(final Group group, final List<HL7Segment> segments) throws HL7Exception {
        for (final String structureName : group.getNames()) {
            final Structure[] structures = group.getAll(structureName);
            if (group.isGroup(structureName)) {
                for (final Structure structure : structures) {
                    populateSegments((Group) structure, segments);
                }
            } else {
                for (final Structure structure : structures) {
                    final Segment segment = (Segment) structure;
                    final HapiSegment hapiSegment = new HapiSegment(segment);
                    segments.add(hapiSegment);
                }
            }
        }
    }

    @Override
    public List<HL7Segment> getSegments() {
        return Collections.unmodifiableList(allSegments);
    }

    @Override
    public List<HL7Segment> getSegments(final String segmentType) {
        final List<HL7Segment> segments = segmentMap.get(segmentType);
        if (segments == null) {
            return Collections.emptyList();
        }

        return Collections.unmodifiableList(segments);
    }

    @Override
    public String toString() {
        return message.toString();
    }
}