Java tutorial
/* * Atricore IDBus * * Copyright (c) 2009, Atricore Inc. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ package org.atricore.idbus.kernel.planning.jbpm; import org.springframework.beans.factory.xml.DefaultNamespaceHandlerResolver; import org.springframework.context.ApplicationContext; import org.springframework.core.io.Resource; import org.springframework.core.io.UrlResource; import org.springframework.core.io.ClassPathResource; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.osgi.context.support.OsgiBundleXmlApplicationContext; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.xbean.spring.context.ClassPathXmlApplicationContext; import org.osgi.framework.BundleContext; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.URL; import java.net.MalformedURLException; import java.util.ArrayList; import java.util.List; import java.util.Collections; import java.util.logging.Level; /** * * @author <a href="mailto:gbrigandi@atricore.org">Gianluca Brigandi</a> * @version $Rev: 252 $ $Date: 2008-12-22 18:24:21 -0200 (Mon, 22 Dec 2008) $ */ public class OsgiProcessFragmentRegistryApplicationContext extends OsgiBundleXmlApplicationContext { private static final String DEFAULT_PROCESS_DESCRIPTOR_FILE = "jpdl-process-descriptor.xml"; private static final String DEFAULT_JBPM_FRAGMENT_CFG_FILE = "META-INF/jbpm/jbpm-process-fragment-default.xml"; private static final String DEFAULT_JBPM_EXT_FRAGMENT_CFG_FILE = "classpath*:META-INF/jbpm/jbpm.fragment"; protected final transient Log logger = LogFactory.getLog(getClass()); private DefaultNamespaceHandlerResolver nsHandlerResolver; private String[] cfgFiles; private URL[] cfgFileURLs; public OsgiProcessFragmentRegistryApplicationContext(String cf, BundleContext bundleContext) { this(cf, null, bundleContext); } public OsgiProcessFragmentRegistryApplicationContext(String[] cfs, BundleContext bundleContext) { this(cfs, null, bundleContext); } public OsgiProcessFragmentRegistryApplicationContext(URL url, BundleContext bundleContext) { this(url, null, bundleContext); } public OsgiProcessFragmentRegistryApplicationContext(String cf, ApplicationContext parent, BundleContext bundleContext) { this(new String[] { cf }, parent, bundleContext); } public OsgiProcessFragmentRegistryApplicationContext(URL url, ApplicationContext parent, BundleContext bundleContext) { this(new URL[] { url }, parent, bundleContext); } public OsgiProcessFragmentRegistryApplicationContext(String[] cf, ApplicationContext parent, BundleContext bundleContext) { super(new String[0], parent); cfgFiles = cf; setBundleContext(bundleContext); refresh(); } public OsgiProcessFragmentRegistryApplicationContext(URL[] url, ApplicationContext parent, BundleContext bundleContext) { super(new String[0], parent); cfgFileURLs = url; setBundleContext(bundleContext); refresh(); } protected Resource[] getConfigResources() { List<Resource> resources = new ArrayList<Resource>(); try { PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver( Thread.currentThread().getContextClassLoader()); Collections.addAll(resources, resolver.getResources(DEFAULT_JBPM_FRAGMENT_CFG_FILE)); Resource[] exts = resolver.getResources(DEFAULT_JBPM_EXT_FRAGMENT_CFG_FILE); for (Resource r : exts) { InputStream is = r.getInputStream(); BufferedReader rd = new BufferedReader(new InputStreamReader(is, "UTF-8")); String line = rd.readLine(); while (line != null) { if (!"".equals(line)) { resources.add(resolver.getResource(line)); } line = rd.readLine(); } is.close(); } } catch (IOException ex) { // ignore } if (null == cfgFiles) { cfgFiles = new String[] { DEFAULT_PROCESS_DESCRIPTOR_FILE }; } for (String cfgFile : cfgFiles) { boolean found = false; Resource cpr = new ClassPathResource(cfgFile); if (!cpr.exists()) { try { //see if it's a URL URL url = new URL(cfgFile); cpr = new UrlResource(url); if (cpr.exists()) { resources.add(cpr); found = true; } } catch (MalformedURLException e) { //ignore } if (!found) { //try loading it our way URL url = getResource(cfgFile, this.getClass()); if (url != null) { cpr = new UrlResource(url); if (cpr.exists()) { resources.add(cpr); found = true; } } } } else { resources.add(cpr); found = true; } if (!found) { logger.warn("No Process Descriptor found: " + cfgFile); } } if (null != cfgFileURLs) { for (URL cfgFileURL : cfgFileURLs) { UrlResource ur = new UrlResource(cfgFileURL); if (ur.exists()) { resources.add(ur); } else { logger.warn("No Process Descriptor found: " + cfgFileURL); } } } logger.info("Creating application context with resources: " + resources); if (0 == resources.size()) { return null; } Resource[] res = new Resource[resources.size()]; res = resources.toArray(res); return res; } /** * Load a given resource. <p/> This method will try to load the resource * using the following methods (in order): * <ul> * <li>From Thread.currentThread().getContextClassLoader() * <li>From ClassLoaderUtil.class.getClassLoader() * <li>callingClass.getClassLoader() * </ul> * * @param resourceName The name of the resource to load * @param callingClass The Class object of the calling object */ private URL getResource(String resourceName, Class callingClass) { URL url = Thread.currentThread().getContextClassLoader().getResource(resourceName); if (url == null && resourceName.startsWith("/")) { //certain classloaders need it without the leading / url = Thread.currentThread().getContextClassLoader().getResource(resourceName.substring(1)); } if (url == null) { ClassLoader cl = callingClass.getClassLoader(); if (cl != null) { url = cl.getResource(resourceName); } } if (url == null) { url = callingClass.getResource(resourceName); } if ((url == null) && (resourceName != null) && (resourceName.charAt(0) != '/')) { return getResource('/' + resourceName, callingClass); } return url; } }