1 /*
2 * Copyright 2008 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 package org.openehealth.ipf.platform.camel.core.adapter;
17
18 import org.apache.camel.Exchange;
19 import org.apache.camel.Expression;
20 import org.apache.camel.Processor;
21
22 /**
23 * Abstract base class for classes that adapt <i>transform support library</i>
24 * interfaces to Apache Camel's {@link Processor}.
25 *
26 * @author Martin Krasser
27 */
28 public abstract class ProcessorAdapter extends AdapterSupport implements Processor {
29
30 @Override // make use of co-variant return types to support DSL
31 public ProcessorAdapter input(Expression inputExpression) {
32 return (ProcessorAdapter)super.input(inputExpression);
33 }
34
35 @Override // make use of co-variant return types to support DSL
36 public ProcessorAdapter params(Expression paramsExpression) {
37 return (ProcessorAdapter)super.params(paramsExpression);
38 }
39
40 @Override // make use of co-variant return types to support DSL
41 public ProcessorAdapter staticParams(Object... params) {
42 return (ProcessorAdapter)super.staticParams(params);
43 }
44
45 /**
46 * Dispatches the <code>exchange</code> to
47 * {@link #doProcess(Exchange, Object, Object...)} implementations.
48 *
49 * @see #input(Expression)
50 * @see #params(Expression)
51 * @see #staticParams(Object...)
52 */
53 @Override
54 public void process(Exchange exchange) throws Exception {
55 Object input = adaptInput(exchange);
56 Object params = adaptParams(exchange);
57 if (params == null) {
58 doProcess(exchange, input, (Object[])null);
59 } else if (params.getClass().isArray()) {
60 doProcess(exchange, input, (Object[])params);
61 } else {
62 doProcess(exchange, input, params);
63 }
64 }
65
66 /**
67 * Processes input data and populates the output exchange.
68 *
69 * @param exchange
70 * message exchange where to write processing results.
71 * @param inputData
72 * input data.
73 * @param inputParams
74 * input parameters.
75 * @throws Exception
76 * if a processing error occurs.
77 */
78 protected abstract void doProcess(Exchange exchange, Object inputData,
79 Object... inputParams) throws Exception;
80
81 }