diff options
Diffstat (limited to 'java/sca/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ContributionClassLoader.java')
-rw-r--r-- | java/sca/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ContributionClassLoader.java | 386 |
1 files changed, 0 insertions, 386 deletions
diff --git a/java/sca/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ContributionClassLoader.java b/java/sca/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ContributionClassLoader.java deleted file mode 100644 index 25b3eae350..0000000000 --- a/java/sca/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ContributionClassLoader.java +++ /dev/null @@ -1,386 +0,0 @@ -/* - * 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.tuscany.sca.contribution.java.impl; - -import java.io.IOException; -import java.net.MalformedURLException; -import java.net.URL; -import java.net.URLClassLoader; -import java.util.Collection; -import java.util.Collections; -import java.util.Enumeration; -import java.util.HashSet; - -import org.apache.tuscany.sca.contribution.Contribution; -import org.apache.tuscany.sca.contribution.Export; -import org.apache.tuscany.sca.contribution.Import; -import org.apache.tuscany.sca.contribution.java.JavaImport; - - -public class ContributionClassLoader extends URLClassLoader { -// public class ContributionClassLoader { - - private Contribution contribution; - // private b urlClassLoader; - - /** - * Constructor for contribution ClassLoader - * - * @param contribution - * @param parent - * @throws MalformedURLException - */ - public ContributionClassLoader(Contribution contribution, final ClassLoader parent) { - super(new URL[0], parent); - // Note that privileged use of getContextClassLoader have been promoted to callers. - // super(new URL[0], parent == null?Thread.currentThread().getContextClassLoader(): null); - this.contribution = contribution; - if (contribution.getLocation() != null) { - try { - this.addURL(new URL(contribution.getLocation())); - for (URL url : ContributionHelper.getNestedJarUrls(contribution)) { - this.addURL(url); - } - } catch (IOException e) { - throw new RuntimeException(e); - } - } - } - - /* - * Return the ClassLoader corresponding to a contribution providing an export - * Create a new ClassLoader for the contribution if one does not exist - */ - private ClassLoader getExportClassLoader(Contribution exportingContribution) { - ClassLoader cl = exportingContribution.getClassLoader(); - if (!(cl instanceof ContributionClassLoader)) { - if (cl == null) { - cl = getParent(); - } - - cl = new ContributionClassLoader(exportingContribution, cl); - exportingContribution.setClassLoader(cl); - } - return cl; - } - - /* (non-Javadoc) - * @see java.net.URLClassLoader#findClass(java.lang.String) - * - * Search path for class: - * This contribution - * Imported contributions - */ - @Override - protected Class<?> findClass(String className) throws ClassNotFoundException { - - Class<?> clazz = null; - try { - clazz = findClassFromContribution(className); - } catch (ClassNotFoundException e) { - - for (Import import_ : this.contribution.getImports()) { - if (classNameMatchesImport(className, import_)) { - // Delegate the resolution to the imported contribution - for (Contribution exportingContribution : ((JavaImportModelResolver)import_.getModelResolver()).getExportContributions()) { - - ClassLoader exportClassLoader = getExportClassLoader(exportingContribution); - if (exportClassLoader instanceof ContributionClassLoader) { - - for (Export export : exportingContribution.getExports()) { - try { - if (import_.match(export)) { - clazz = ((ContributionClassLoader)exportClassLoader).findClassFromContribution(className); - break; - } - } catch (ClassNotFoundException e1) { - continue; - } - - } - if (clazz != null) break; - } - } - if (clazz != null) break; - } - } - - if (clazz == null) throw e; - } - return clazz; - } - - - /* (non-Javadoc) - * @see java.lang.ClassLoader#loadClass(java.lang.String, boolean) - * - * Search path for class: - * Parent ClassLoader - * This contribution - * Imported contributions - * - */ - @Override - protected synchronized Class<?> loadClass(String className, boolean resolveClass) - throws ClassNotFoundException { - - Class<?> clazz = null; - try { - - if (this.getParent() != null) - clazz = this.getParent().loadClass(className); - - } catch (ClassNotFoundException e) { - } - - if (clazz == null) - clazz = findClass(className); - - - if (resolveClass) - this.resolveClass(clazz); - return clazz; - - } - - - - /* - * (non-Javadoc) - * - * @see java.net.URLClassLoader#findResource(java.lang.String) - */ - @Override - public URL findResource(String name) { - - URL url = findResourceFromContribution(name); - - if (url == null) { - for (Import import_ : this.contribution.getImports()) { - if (resourceNameMatchesImport(name, import_)) { - // Delegate the resolution to the imported contribution - for (Contribution exportingContribution : ((JavaImportModelResolver)import_.getModelResolver()).getExportContributions()) { - - ClassLoader exportClassLoader = getExportClassLoader(exportingContribution); - if (exportClassLoader instanceof ContributionClassLoader) { - - for (Export export : exportingContribution.getExports()) { - if (import_.match(export)) { - url = ((ContributionClassLoader)exportClassLoader).findResourceFromContribution(name); - if (url != null) break; - } - } - if (url != null) break; - } - } - if (url != null) break; - } - } - - } - return url; - } - - - /* (non-Javadoc) - * @see java.net.URLClassLoader#findResources(java.lang.String) - */ - @Override - public Enumeration<URL> findResources(String name) throws IOException { - - return Collections.enumeration(findResourceSet(name)); - } - - - - - /* (non-Javadoc) - * @see java.lang.ClassLoader#getResource(java.lang.String) - * - * Find a resource. - * Search path for resource: - * Parent ClassLoader - * This contribution - * Imported contributions - */ - @Override - public URL getResource(String resName) { - - URL resource = null; - - if (this.getParent() != null) { - resource = this.getParent().getResource(resName); - } - if (resource == null) - resource = findResource(resName); - - return resource; - } - - - - /* (non-Javadoc) - * @see java.lang.ClassLoader#getResources(java.lang.String) - * - * Return list of resources from this contribution, resources - * imported through imported contributions and resources from parent - * ClassLoader. - */ - @Override - public Enumeration<URL> getResources(String resName) throws IOException { - - HashSet<URL> resourceSet = findResourceSet(resName); - addEnumerationToCollection(resourceSet, super.getResources(resName)); - - return Collections.enumeration(resourceSet); - } - - - /* - * Find set of resources - */ - private HashSet<URL> findResourceSet(String name) throws IOException { - - HashSet<URL> resources = new HashSet<URL>(); - - addEnumerationToCollection(resources, super.findResources(name)); - - for (Import import_ : this.contribution.getImports()) { - if (!(import_ instanceof JavaImport)) { - continue; - } - if (resourceNameMatchesImport(name, import_)) { - // Delegate the resolution to the imported contribution - for (Contribution exportingContribution : ((JavaImportModelResolver)import_.getModelResolver()).getExportContributions()) { - - ClassLoader exportClassLoader = getExportClassLoader(exportingContribution); - if (exportClassLoader instanceof ContributionClassLoader) { - - for (Export export : exportingContribution.getExports()) { - if (import_.match(export)) { - addEnumerationToCollection(resources, - ((ContributionClassLoader)exportClassLoader).findResources(name)); - } - } - } - } - } - } - - return resources; - } - - - /* - * Find class from contribution. If class has already been loaded, return loaded class. - */ - private Class<?> findClassFromContribution(String className) throws ClassNotFoundException { - - Class<?> clazz = findLoadedClass(className); - if (clazz == null) - clazz = super.findClass(className); - return clazz; - - } - - /* - * Find resource from contribution. - */ - private URL findResourceFromContribution(String name) { - - return super.findResource(name); - } - - /** - * Check if a class name matches an import statement. - * Class matches if the package name used in <import.java/> matches - * - * @param name Name of class - * @param import_ SCA contribution import - * @return true if this is a matching import - */ - private boolean classNameMatchesImport(String name, Import import_) { - - if (import_ instanceof JavaImport && name != null && name.lastIndexOf('.') > 0) { - JavaImport javaImport = (JavaImport) import_; - - String packageName = name.substring(0, name.lastIndexOf('.')); - if (javaImport.getPackage().endsWith(".*")) { - String prefix = javaImport.getPackage().substring(0, javaImport.getPackage().length() -1); - if (packageName.startsWith(prefix)) { - return true; - } - } else { - return packageName.equals(javaImport.getPackage()); - } - } - - return false; - } - - /** - * Check if a resource name matches an import statement. - * Resource matches if package/namespace match the directory of resource. - * - * @param name Name of resource - * @param import_ SCA contribution import - * @return true if this is a matching import - */ - private boolean resourceNameMatchesImport(String name, Import import_) { - - - if (name == null || name.lastIndexOf('/') <= 0) - return false; - else if (import_ instanceof JavaImport) { - JavaImport javaImport = (JavaImport) import_; - - if (javaImport.getPackage().endsWith(".*")) { - String packageName = name.substring(0, name.lastIndexOf('/')).replace('/', '.'); - String prefix = javaImport.getPackage().substring(0, javaImport.getPackage().length() -1); - if (packageName.startsWith(prefix)) { - return true; - } - } else { - // 'name' is a resource : contains "/" as separators - // Get package name from resource name - String packageName = name.substring(0, name.lastIndexOf('/')); - return packageName.equals(javaImport.getPackage().replaceAll("\\.", "/")); - } - } - return false; - } - - /* - * Add an enumeration to a Collection - */ - private <T extends Object> void addEnumerationToCollection(Collection<T> collection, Enumeration<T> enumeration) { - - while (enumeration.hasMoreElements()) - collection.add(enumeration.nextElement()); - } - - - @Override - public String toString() { - return "SCA Contribution ClassLoader location: " + contribution.getLocation() + " parent ClassLoader: " + getParent(); - } - - -} |