| /* |
| * 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.axiom.core; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationTargetException; |
| import java.nio.charset.StandardCharsets; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.axiom.core.util.EdgeRelation; |
| import org.apache.axiom.core.util.TopologicalSort; |
| |
| public abstract class NodeFactoryImpl implements NodeFactory { |
| private final NodeFactory2 factory2; |
| private final Map<Class<?>, Constructor<?>> constructorMap; |
| |
| public NodeFactoryImpl(ClassLoader cl, String factory2ClassName, String... packages) { |
| try { |
| factory2 = |
| (NodeFactory2) |
| cl.loadClass(factory2ClassName).getDeclaredField("INSTANCE").get(null); |
| } catch (ReflectiveOperationException ex) { |
| throw new NodeFactoryException("Failed to instantiate NodeFactory2 implementation", ex); |
| } |
| List<Class<?>> implementations = new ArrayList<Class<?>>(); |
| for (String pkg : packages) { |
| try { |
| BufferedReader in = |
| new BufferedReader( |
| new InputStreamReader( |
| cl.getResourceAsStream( |
| pkg.replace('.', '/') + "/nodetypes.index"), |
| StandardCharsets.UTF_8)); |
| try { |
| String line; |
| while ((line = in.readLine()) != null) { |
| if (line.startsWith("#")) { |
| continue; |
| } |
| String className = pkg + "." + line; |
| try { |
| implementations.add(cl.loadClass(className)); |
| } catch (ClassNotFoundException ex) { |
| throw new NodeFactoryException("Failed to load class " + className, ex); |
| } |
| } |
| } finally { |
| in.close(); |
| } |
| } catch (IOException ex) { |
| throw new NodeFactoryException( |
| "Failed to load node type index for package " + pkg, ex); |
| } |
| } |
| implementations = |
| TopologicalSort.sort( |
| implementations, |
| new EdgeRelation<Class<?>>() { |
| @Override |
| public boolean isEdge(Class<?> from, Class<?> to) { |
| return to.isAssignableFrom(from); |
| } |
| }); |
| Map<Class<?>, Class<?>> interfaceToImplementationMap = new HashMap<Class<?>, Class<?>>(); |
| Map<Class<?>, Constructor<?>> implementationToConstructorMap = |
| new HashMap<Class<?>, Constructor<?>>(); |
| Set<Class<?>> ambiguousInterfaces = new HashSet<Class<?>>(); |
| for (Class<?> implementation : implementations) { |
| Set<Class<?>> interfaces = new HashSet<Class<?>>(); |
| collectInterfaces(implementation, interfaces); |
| for (Class<?> iface : interfaces) { |
| if (!ambiguousInterfaces.contains(iface)) { |
| Class<?> clazz = interfaceToImplementationMap.get(iface); |
| if (clazz == null || implementation.isAssignableFrom(clazz)) { |
| interfaceToImplementationMap.put(iface, implementation); |
| } else if (!clazz.isAssignableFrom(implementation)) { |
| interfaceToImplementationMap.remove(iface); |
| ambiguousInterfaces.add(iface); |
| } |
| } |
| } |
| try { |
| implementationToConstructorMap.put(implementation, implementation.getConstructor()); |
| } catch (NoSuchMethodException ex) { |
| throw new NodeFactoryException( |
| "Failed to get constructor for " + implementation.getName(), ex); |
| } |
| } |
| constructorMap = new HashMap<Class<?>, Constructor<?>>(); |
| for (Map.Entry<Class<?>, Class<?>> entry : interfaceToImplementationMap.entrySet()) { |
| constructorMap.put( |
| entry.getKey(), implementationToConstructorMap.get(entry.getValue())); |
| } |
| // TODO: this should eventually go away |
| constructorMap.putAll(implementationToConstructorMap); |
| } |
| |
| private static void collectInterfaces(Class<?> clazz, Set<Class<?>> interfaces) { |
| for (Class<?> iface : clazz.getInterfaces()) { |
| if (interfaces.add(iface)) { |
| collectInterfaces(iface, interfaces); |
| } |
| } |
| Class<?> superclass = clazz.getSuperclass(); |
| if (superclass != null) { |
| collectInterfaces(superclass, interfaces); |
| } |
| } |
| |
| @Override |
| public NodeFactory2 getFactory2() { |
| return factory2; |
| } |
| |
| @Override |
| public final <T extends CoreNode> T createNode(Class<T> type) { |
| Constructor<?> constructor = constructorMap.get(type); |
| if (constructor == null) { |
| throw new NodeFactoryException("Unknown node type " + type.getName()); |
| } else { |
| try { |
| return type.cast(constructor.newInstance()); |
| } catch (InvocationTargetException ex) { |
| throw new NodeFactoryException( |
| "Caught exception thrown by constructor", ex.getCause()); |
| } catch (InstantiationException ex) { |
| throw new NodeFactoryException("Failed to invoke constructor", ex); |
| } catch (IllegalAccessException ex) { |
| throw new NodeFactoryException("Failed to invoke constructor", ex); |
| } |
| } |
| } |
| } |