1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.maven.internal.impl.model.rootlocator;
20
21 import javax.xml.stream.XMLInputFactory;
22 import javax.xml.stream.XMLStreamException;
23 import javax.xml.stream.XMLStreamReader;
24
25 import java.io.IOException;
26 import java.io.InputStream;
27 import java.nio.file.Files;
28 import java.nio.file.Path;
29
30 import org.apache.maven.api.di.Named;
31 import org.apache.maven.api.services.model.RootDetector;
32
33 @Named
34 public class PomXmlRootDetector implements RootDetector {
35 @Override
36 public boolean isRootDirectory(Path dir) {
37 // we're too early to use the modelProcessor ...
38 Path pom = dir.resolve("pom.xml");
39 try (InputStream is = Files.newInputStream(pom)) {
40 XMLStreamReader parser = XMLInputFactory.newFactory().createXMLStreamReader(is);
41 if (parser.nextTag() == XMLStreamReader.START_ELEMENT
42 && parser.getLocalName().equals("project")) {
43 for (int i = 0; i < parser.getAttributeCount(); i++) {
44 if ("root".equals(parser.getAttributeLocalName(i))) {
45 return Boolean.parseBoolean(parser.getAttributeValue(i));
46 }
47 }
48 }
49 } catch (IOException | XMLStreamException e) {
50 // The root locator can be used very early during the setup of Maven,
51 // even before the arguments from the command line are parsed. Any exception
52 // that would happen here should cause the build to fail at a later stage
53 // (when actually parsing the POM) and will lead to a better exception being
54 // displayed to the user, so just bail out and return false.
55 }
56 return false;
57 }
58 }