com.pronoia.hapi.hamcrest.terser.AbstractTerserSpecificationValueMatcher Maven / Gradle / Ivy

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/**
 * 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 com.pronoia.hapi.hamcrest.terser;

import ca.uhn.hl7v2.DefaultHapiContext;
import ca.uhn.hl7v2.HL7Exception;
import ca.uhn.hl7v2.model.GenericMessage;
import ca.uhn.hl7v2.model.Message;
import ca.uhn.hl7v2.util.Terser;

import com.pronoia.hapi.HapiTestException;

import org.hamcrest.Description;
import org.hamcrest.TypeSafeDiagnosingMatcher;

import static com.pronoia.hapi.HapiTestUtil.createGenericHapiContext;
import static com.pronoia.hapi.HapiTestUtil.encode;


public abstract class AbstractTerserSpecificationValueMatcher extends TypeSafeDiagnosingMatcher {
    static final DefaultHapiContext GENERIC_HAPI_CONTEXT = createGenericHapiContext();

    final boolean useGenericMessage;
    final String expected;
    final String spec;

    public AbstractTerserSpecificationValueMatcher(String spec, boolean useGenericMessage, String expected) {
        this.useGenericMessage = useGenericMessage;
        this.expected = expected;
        this.spec = spec;
    }

    public AbstractTerserSpecificationValueMatcher(String spec, boolean useGenericMessage, Terser expectedTerser) {
        this.useGenericMessage = useGenericMessage;
        this.spec = spec;
        try {
            this.expected = convert(expectedTerser).get(spec);
        } catch (HL7Exception hapiEx) {
            try {
                Message message = expectedTerser.getSegment("MSH").getMessage();
                throw new HapiTestException("Exception encountered extracting expected value for spec '" + spec + "' from Terser(" + message.getClass().getName() + ")", hapiEx);
            } catch (HL7Exception determineMessageEx) {
                throw new HapiTestException("Exception encountered extracting expected value for spec '" + spec + "' from Terser", hapiEx);
            }
        }
    }

    protected abstract boolean doMatches(String actual);

    @Override
    protected boolean matchesSafely(Terser actualTerser, Description mismatchDescription) {
        String actual = null;
        try {
            actual = convert(actualTerser).get(spec);
            if (!doMatches(actual)) {
                mismatchDescription.appendText(spec)
                    .appendText(" = ")
                    .appendValue(actual);
                return false;
            }
        } catch (HL7Exception hapiEx) {
            mismatchDescription
                .appendText("Exception encountered extracting value for '")
                .appendText(spec)
                .appendText("' spec from Terser");
            try {
                Message message = actualTerser.getSegment("MSH").getMessage();
                mismatchDescription.appendText("(")
                    .appendText(message.getClass().getName())
                    .appendText(")");
            } catch (HL7Exception determineMessageEx) {
                // eat this
            }
            mismatchDescription.appendText(" ")
                .appendValue(hapiEx);
            return false;
        }

        return true;
    }

    Terser convert(Terser terser) {
        try {
            if (useGenericMessage) {
                Message expectedMessage = terser.getSegment("MSH").getMessage();
                if (!(expectedMessage instanceof GenericMessage)) {
                    Message genericMessage = GENERIC_HAPI_CONTEXT.getPipeParser().parse(encode(expectedMessage));
                    return new Terser(genericMessage);
                }
            }
        } catch (HL7Exception hapiEx) {
            throw new HapiTestException("HAPI Exception encountered converting to GenericMessage", hapiEx);
        }

        return terser;
    }
}