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1   /*
2    * Copyright 2014 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.openehealth.ipf.platform.camel.hl7;
18  
19  import ca.uhn.hl7v2.HL7Exception;
20  import ca.uhn.hl7v2.model.Message;
21  import org.apache.camel.Exchange;
22  import org.apache.camel.Expression;
23  import org.openehealth.ipf.modules.hl7.HL7v2Exception;
24  
25  /**
26   * Expression that returns a predefined response parsed with the current message's {@link ca.uhn.hl7v2.HapiContext}
27   */
28  class StaticResponseExpression implements Expression {
29  
30      private final String message;
31  
32      public StaticResponseExpression(String message) {
33          this.message = message;
34      }
35  
36      @Override
37      public <T> T evaluate(Exchange exchange, Class<T> type) {
38          try {
39              Message msg = HL7v2.bodyMessage(exchange);
40              Message result = msg.getParser().parse(message);
41              return type.cast(result);
42          } catch (HL7Exception e) {
43              throw new HL7v2Exception(e);
44          }
45  
46      }
47  }