1 package org.codehaus.plexus.metadata.merge;
2
3 /*
4 * The MIT License
5 *
6 * Copyright (c) 2006, The Codehaus
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
9 * associated documentation files (the "Software"), to deal in the Software without restriction,
10 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
11 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in all copies or
15 * substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
18 * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24 import java.io.File;
25 import java.io.FileOutputStream;
26 import java.io.IOException;
27 import java.io.OutputStreamWriter;
28 import java.io.Writer;
29 import java.util.List;
30
31 import org.codehaus.plexus.util.IOUtil;
32 import org.jdom2.Document;
33 import org.jdom2.JDOMException;
34 import org.jdom2.input.SAXBuilder;
35 import org.jdom2.input.sax.XMLReaderSAX2Factory;
36 import org.jdom2.output.XMLOutputter;
37
38 /**
39 * Base class for common mergers.
40 *
41 * @author <a href="mailto:brett@codehaus.org">Brett Porter</a>
42 */
43 public abstract class AbstractMerger implements Merger {
44 /**
45 * @see org.codehaus.plexus.metadata.merge.Merger#writeMergedDocument(org.jdom2.Document,
46 * java.io.File)
47 */
48 public void writeMergedDocument(Document mergedDocument, File file) throws IOException {
49 if (!file.getParentFile().exists()) {
50 file.getParentFile().mkdirs();
51 }
52
53 XMLOutputter out = new XMLOutputter();
54 Writer fw = null;
55 try {
56 fw = new OutputStreamWriter(new FileOutputStream(file), "UTF-8");
57 out.output(mergedDocument, fw);
58 } finally {
59 IOUtil.close(fw);
60 }
61 }
62
63 public void mergeDescriptors(File outputDescriptor, List<File> descriptors) throws IOException {
64 SAXBuilder builder = new SAXBuilder(new XMLReaderSAX2Factory(false, Driver.class.getName()));
65
66 Document finalDoc = null;
67
68 for (File f : descriptors) {
69 try {
70 Document doc = builder.build(f);
71
72 if (finalDoc != null) {
73 // Last specified has dominance
74 finalDoc = merge(doc, finalDoc);
75 } else {
76 finalDoc = doc;
77 }
78 } catch (JDOMException e) {
79 throw new IOException("Invalid input descriptor for merge: " + f + " --> " + e.getMessage());
80 } catch (MergeException e) {
81 throw new IOException("Error merging descriptor: " + f + " --> " + e.getMessage());
82 }
83 }
84
85 if (finalDoc != null) {
86 try {
87 writeMergedDocument(finalDoc, outputDescriptor);
88 } catch (IOException e) {
89 throw new IOException("Error writing merged descriptor: " + outputDescriptor);
90 }
91 }
92 }
93 }