Java tutorial
/*************************GO-LICENSE-START********************************* * Copyright 2014 ThoughtWorks, Inc. * * Licensed 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. *************************GO-LICENSE-END***********************************/ package com.thoughtworks.go.plugin.infra.plugininfo; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.util.Arrays; import java.util.jar.JarFile; import java.util.zip.ZipEntry; import com.thoughtworks.go.util.FileUtil; import com.thoughtworks.go.util.SystemEnvironment; import org.apache.commons.io.IOUtils; import org.apache.log4j.Logger; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import static com.thoughtworks.go.util.SystemEnvironment.PLUGIN_BUNDLE_PATH; import static org.apache.commons.io.IOUtils.closeQuietly; @Component public class GoPluginDescriptorBuilder { private static final Logger LOGGER = Logger.getLogger(GoPluginDescriptorBuilder.class); private static final String PLUGIN_XML = "plugin.xml"; private SystemEnvironment systemEnvironment; private File bundlePathLocation; protected GoPluginDescriptorBuilder() { this.systemEnvironment = new SystemEnvironment(); bundlePathLocation = bundlePath(); } @Autowired public GoPluginDescriptorBuilder(SystemEnvironment systemEnvironment) { this.systemEnvironment = systemEnvironment; bundlePathLocation = bundlePath(); } public GoPluginDescriptor build(File pluginJarFile, boolean isBundledPlugin) { if (!pluginJarFile.exists()) { throw new RuntimeException( String.format("Plugin jar does not exist: %s", pluginJarFile.getAbsoluteFile())); } InputStream pluginXMLStream = null; JarFile jarFile = null; try { jarFile = new JarFile(pluginJarFile); ZipEntry entry = jarFile.getEntry(PLUGIN_XML); if (entry == null) { return GoPluginDescriptor.usingId(pluginJarFile.getName(), pluginJarFile.getAbsolutePath(), getBundleLocation(bundlePathLocation, pluginJarFile.getName()), isBundledPlugin); } pluginXMLStream = jarFile.getInputStream(entry); return GoPluginDescriptorParser.parseXML(pluginXMLStream, pluginJarFile.getAbsolutePath(), getBundleLocation(bundlePathLocation, pluginJarFile.getName()), isBundledPlugin); } catch (Exception e) { LOGGER.warn("Could not load plugin with jar filename:" + pluginJarFile.getName(), e); String cause = e.getCause() != null ? String.format("%s. Cause: %s", e.getMessage(), e.getCause().getMessage()) : e.getMessage(); return GoPluginDescriptor .usingId(pluginJarFile.getName(), pluginJarFile.getAbsolutePath(), getBundleLocation(bundlePathLocation, pluginJarFile.getName()), isBundledPlugin) .markAsInvalid(Arrays.asList( String.format("Plugin with ID (%s) is not valid: %s", pluginJarFile.getName(), cause)), e); } finally { IOUtils.closeQuietly(pluginXMLStream); closeQuietly(jarFile); } } private void closeQuietly(JarFile jarFile) { if (jarFile != null) { try { jarFile.close(); } catch (IOException e) { //ignore } } } private File getBundleLocation(File bundleDirectory, String name) { return new File(bundleDirectory, name); } File bundlePath() { File bundleDir = new File(systemEnvironment.get(PLUGIN_BUNDLE_PATH)); FileUtil.validateAndCreateDirectory(bundleDir); return bundleDir; } }