| /* |
| * 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.felix.ipojo.api; |
| |
| import java.util.ArrayList; |
| import java.util.Dictionary; |
| import java.util.List; |
| import java.util.Properties; |
| |
| import org.apache.felix.ipojo.ComponentInstance; |
| import org.apache.felix.ipojo.ConfigurationException; |
| import org.apache.felix.ipojo.Factory; |
| import org.apache.felix.ipojo.MissingHandlerException; |
| import org.apache.felix.ipojo.UnacceptableConfiguration; |
| |
| |
| /** |
| * The component type class allows specifying a new component type |
| * and its attached factory. It also allows creating instances form |
| * the specified component type. |
| * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| */ |
| public abstract class ComponentType { |
| |
| /** |
| * The list of instances created from the |
| * current component type. |
| */ |
| private List m_instances = new ArrayList(); |
| |
| |
| /** |
| * Gets the factory attached to the current |
| * component type. |
| * @return the factory |
| */ |
| public abstract Factory getFactory(); |
| |
| /** |
| * Starts the factory attached to this |
| * component type. Once started a factory |
| * and its attached component type |
| * cannot be modified. |
| */ |
| public abstract void start(); |
| |
| /** |
| * Stops the factory attached to this |
| * component type. |
| */ |
| public abstract void stop(); |
| |
| |
| /** |
| * Creates a component instance from the current type |
| * with an empty configuration. |
| * @return the component instance object. |
| * @throws UnacceptableConfiguration the configuration is not acceptable |
| * @throws MissingHandlerException the factory in invalid |
| * @throws ConfigurationException the instance configuration failed |
| */ |
| public ComponentInstance createInstance() throws UnacceptableConfiguration, MissingHandlerException, ConfigurationException { |
| ComponentInstance ci = ensureAndGetFactory().createComponentInstance(null); |
| m_instances.add(ci); |
| return ci; |
| } |
| |
| /** |
| * Creates a component instance from the current type |
| * with the given name. |
| * @param name the instance name |
| * @return the component instance object. |
| * @throws UnacceptableConfiguration the configuration is not acceptable |
| * @throws MissingHandlerException the factory in invalid |
| * @throws ConfigurationException the instance configuration failed |
| */ |
| public ComponentInstance createInstance(String name) throws UnacceptableConfiguration, MissingHandlerException, ConfigurationException { |
| Dictionary dict = null; |
| if (name != null) { |
| dict = new Properties(); |
| dict.put("instance.name", name); |
| } |
| ComponentInstance ci = ensureAndGetFactory().createComponentInstance(dict); |
| m_instances.add(ci); |
| return ci; |
| } |
| |
| /** |
| * Creates a component instance from the current type |
| * with the given configuration. |
| * @param conf the configuration |
| * @return the component instance object. |
| * @throws UnacceptableConfiguration the configuration is not acceptable |
| * @throws MissingHandlerException the factory in invalid |
| * @throws ConfigurationException the instance configuration failed |
| */ |
| public ComponentInstance createInstance(Dictionary conf) throws UnacceptableConfiguration, MissingHandlerException, ConfigurationException { |
| ComponentInstance ci = ensureAndGetFactory().createComponentInstance(conf); |
| m_instances.add(ci); |
| return ci; |
| } |
| |
| /** |
| * Disposes the given name. The instance must be created from this |
| * component type. |
| * @param ci the component instance to delete |
| * @return <code>true</code> if the instance was |
| * successfully disposed. |
| */ |
| public boolean disposeInstance(ComponentInstance ci) { |
| if (m_instances.remove(ci)) { |
| ci.dispose(); |
| return true; |
| } else { |
| System.err.println("The instance was not created from this component type"); |
| return false; |
| } |
| } |
| |
| /** |
| * Gets the component instance created from this component type. |
| * with the given name. |
| * @param name the instance name. |
| * @return the component instance with the given name and created |
| * from the current component type factory. <code>null</code> if |
| * the instance cannot be found. |
| */ |
| public ComponentInstance getInstanceByName(String name) { |
| for (int i = 0; i < m_instances.size(); i++) { |
| ComponentInstance ci = (ComponentInstance) m_instances.get(i); |
| if (ci.getInstanceName().equals(name)) { |
| return ci; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Disposes the instance created with this component type which |
| * has the given name. |
| * @param name the name of the instance to delete. |
| * @return <code>true</code> is the instance is successfully disposed. |
| */ |
| public boolean disposeInstance(String name) { |
| ComponentInstance ci = getInstanceByName(name); |
| if (ci == null) { |
| System.err.println("The instance was not found in this component type"); |
| return false; |
| } else { |
| return disposeInstance(ci); |
| } |
| } |
| |
| /** |
| * Returns the attached factory. |
| * Before returning the factory, the consistency of the |
| * factory is checked. |
| * @return the attached factory to the current component type |
| */ |
| private Factory ensureAndGetFactory() { |
| ensureFactory(); |
| return getFactory(); |
| } |
| |
| /** |
| * Checks if the factory is already created. |
| */ |
| private void ensureFactory() { |
| if (getFactory() == null) { |
| throw new IllegalStateException("The factory associated with the component type is not created"); |
| } else { |
| if (getFactory().getState() == Factory.INVALID) { |
| throw new IllegalStateException("The factory associated with the component type is invalid (not started or missing handlers)"); |
| } |
| } |
| } |
| |
| |
| } |