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;
20
21 import javax.xml.stream.XMLStreamException;
22 import javax.xml.stream.XMLStreamReader;
23
24 import java.io.IOException;
25 import java.io.InputStream;
26 import java.nio.file.Files;
27 import java.nio.file.Path;
28
29 import com.ctc.wstx.stax.WstxInputFactory;
30 import org.apache.maven.api.di.Named;
31 import org.apache.maven.api.services.model.*;
32
33 @Named
34 public class DefaultRootLocator implements RootLocator {
35
36 public boolean isRootDirectory(Path dir) {
37 if (Files.isDirectory(dir.resolve(".mvn"))) {
38 return true;
39 }
40 // we're too early to use the modelProcessor ...
41 Path pom = dir.resolve("pom.xml");
42 try (InputStream is = Files.newInputStream(pom)) {
43 XMLStreamReader parser = new WstxInputFactory().createXMLStreamReader(is);
44 if (parser.nextTag() == XMLStreamReader.START_ELEMENT
45 && parser.getLocalName().equals("project")) {
46 for (int i = 0; i < parser.getAttributeCount(); i++) {
47 if ("root".equals(parser.getAttributeLocalName(i))) {
48 return Boolean.parseBoolean(parser.getAttributeValue(i));
49 }
50 }
51 }
52 } catch (IOException | XMLStreamException e) {
53 // The root locator can be used very early during the setup of Maven,
54 // even before the arguments from the command line are parsed. Any exception
55 // that would happen here should cause the build to fail at a later stage
56 // (when actually parsing the POM) and will lead to a better exception being
57 // displayed to the user, so just bail out and return false.
58 }
59 return false;
60 }
61 }