| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.maven.project; |
| |
| import javax.xml.stream.XMLStreamException; |
| import javax.xml.stream.XMLStreamReader; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.file.Files; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.jar.JarFile; |
| import java.util.zip.ZipEntry; |
| |
| import com.ctc.wstx.stax.WstxInputFactory; |
| import org.apache.maven.api.xml.XmlNode; |
| import org.apache.maven.internal.xml.XmlNodeStaxBuilder; |
| |
| /** |
| * Creates an extension descriptor from some XML stream. |
| * |
| */ |
| public class ExtensionDescriptorBuilder { |
| |
| /** |
| * @since 3.3.0 |
| */ |
| public String getExtensionDescriptorLocation() { |
| return "META-INF/maven/extension.xml"; |
| } |
| |
| /** |
| * Extracts the extension descriptor (if any) from the specified JAR file. |
| * |
| * @param extensionJar The JAR file or directory to extract the descriptor from, must not be {@code null}. |
| * @return The extracted descriptor or {@code null} if no descriptor was found. |
| * @throws IOException If the descriptor is present but could not be parsed. |
| */ |
| public ExtensionDescriptor build(File extensionJar) throws IOException { |
| ExtensionDescriptor extensionDescriptor = null; |
| |
| if (extensionJar.isFile()) { |
| try (JarFile pluginJar = new JarFile(extensionJar, false)) { |
| ZipEntry pluginDescriptorEntry = pluginJar.getEntry(getExtensionDescriptorLocation()); |
| |
| if (pluginDescriptorEntry != null) { |
| try (InputStream is = pluginJar.getInputStream(pluginDescriptorEntry)) { |
| extensionDescriptor = build(is); |
| } |
| } |
| } |
| } else { |
| File pluginXml = new File(extensionJar, getExtensionDescriptorLocation()); |
| |
| if (pluginXml.canRead()) { |
| try (InputStream is = Files.newInputStream(pluginXml.toPath())) { |
| extensionDescriptor = build(is); |
| } |
| } |
| } |
| |
| return extensionDescriptor; |
| } |
| |
| /** |
| * @since 3.3.0 |
| */ |
| public ExtensionDescriptor build(InputStream is) throws IOException { |
| ExtensionDescriptor extensionDescriptor = new ExtensionDescriptor(); |
| |
| XmlNode dom; |
| try { |
| XMLStreamReader reader = WstxInputFactory.newFactory().createXMLStreamReader(is); |
| dom = XmlNodeStaxBuilder.build(reader); |
| } catch (XMLStreamException e) { |
| throw new IOException(e.getMessage(), e); |
| } |
| |
| if (!"extension".equals(dom.getName())) { |
| throw new IOException("Unexpected root element \"" + dom.getName() + "\", expected \"extension\""); |
| } |
| |
| extensionDescriptor.setExportedPackages(parseStrings(dom.getChild("exportedPackages"))); |
| |
| extensionDescriptor.setExportedArtifacts(parseStrings(dom.getChild("exportedArtifacts"))); |
| |
| return extensionDescriptor; |
| } |
| |
| private List<String> parseStrings(XmlNode dom) { |
| List<String> strings = null; |
| |
| if (dom != null) { |
| strings = new ArrayList<>(); |
| |
| for (XmlNode child : dom.getChildren()) { |
| String string = child.getValue(); |
| if (string != null) { |
| string = string.trim(); |
| if (!string.isEmpty()) { |
| strings.add(string); |
| } |
| } |
| } |
| } |
| |
| return strings; |
| } |
| } |