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 static org.openehealth.ipf.platform.camel.core.util.Exchanges.prepareResult;
19
20 import java.io.InputStream;
21 import java.io.Reader;
22
23 import javax.xml.transform.Source;
24
25 import org.apache.camel.Exchange;
26 import org.openehealth.ipf.commons.core.modules.api.Renderer;
27
28 /**
29 * Adapts a {@link Renderer}.
30 *
31 * @author Martin Krasser
32 */
33 public class RendererAdapter extends ProcessorAdapter {
34
35 private final Renderer renderer;
36
37 /**
38 * Creates a new {@link RendererAdapter} and sets the delegate
39 * {@link Renderer}.
40 *
41 * @param renderer
42 * a renderer.
43 */
44 public RendererAdapter(Renderer renderer) {
45 this.renderer = renderer;
46 }
47
48 /**
49 * Delegates processing of input data and input parameters to a
50 * {@link Renderer} object. The rendering result is written to body of the
51 * message returned by
52 * {@link org.openehealth.ipf.platform.camel.core.util.Exchanges#prepareResult(Exchange)}.
53 *
54 * @param exchange
55 * message exchange where to write processing results.
56 * @param inputData
57 * input data.
58 * @param inputParams
59 * input parameters.
60 * @throws Exception
61 * if a processing error occurs.
62 */
63 @Override
64 protected void doProcess(Exchange exchange, Object inputData,
65 Object... inputParams) throws Exception {
66
67 if (inputData instanceof InputStream) {
68 throw new IllegalArgumentException(errorMessage(inputData));
69 } else if (inputData instanceof Reader) {
70 throw new IllegalArgumentException(errorMessage(inputData));
71 } else if (inputData instanceof Source) {
72 throw new IllegalArgumentException(errorMessage(inputData));
73 } else {
74 prepareResult(exchange).setBody(renderer.render(inputData, inputParams));
75 }
76
77 }
78
79 private static String errorMessage(Object inputData) {
80 return "invalid input data type for renderer: " + inputData.getClass()
81 + ". Use a parser or converter instead.";
82 }
83
84 }