| /* |
| * Copyright 2006 The Apache Software Foundation |
| * |
| * 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. |
| * |
| */ |
| package org.apache.felix.examples.spellcheckclient; |
| |
| |
| import java.io.BufferedReader; |
| import java.io.InputStreamReader; |
| |
| import org.apache.felix.examples.spellcheckservice.SpellCheckService; |
| import org.osgi.framework.BundleActivator; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.ServiceEvent; |
| import org.osgi.framework.ServiceListener; |
| import org.osgi.framework.ServiceReference; |
| |
| |
| /** |
| * |
| * |
| * @author <a href="mailto:felix-dev@incubator.apache.org">Felix Project Team</a> |
| */ |
| public class Activator implements BundleActivator, ServiceListener |
| { |
| // Bundle's context. |
| private BundleContext m_context = null; |
| |
| // The service reference being used. |
| private ServiceReference m_ref = null; |
| |
| // The service object being used. |
| private SpellCheckService m_checker = null; |
| |
| |
| /** |
| * Implements BundleActivator.start(). Adds itself as a listener for service |
| * events, then queries for all available spell check services. If none are |
| * found it goes into its normal "passage checking loop" and waits for a |
| * spell check service to arrive. Once it has a spell check service it reads |
| * passages from standard input and checks their spelling using the spell |
| * check service. (NOTE: It is very bad practice to use the calling thread |
| * to perform a lengthy process like this; this is only done for the purpose |
| * of the tutorial.) |
| * |
| * @param context the framework context for the bundle. |
| */ |
| public void start( BundleContext context ) throws Exception |
| { |
| m_context = context; |
| |
| // Listen for events pertaining to dictionary services. |
| m_context.addServiceListener( this, "(objectClass=" + SpellCheckService.class.getName() + ")" ); |
| |
| // Query for a spell check service. |
| m_ref = m_context.getServiceReference( SpellCheckService.class.getName() ); |
| |
| // If we found a spell check service, then get |
| // a reference so we can use it. |
| if ( m_ref != null ) |
| { |
| m_checker = ( SpellCheckService ) m_context.getService( m_ref ); |
| } |
| |
| try |
| { |
| System.out.println( "Enter a blank line to exit." ); |
| String passage = ""; |
| BufferedReader in = new BufferedReader( new InputStreamReader( System.in ) ); |
| |
| // Loop endlessly. |
| while ( true ) |
| { |
| // Ask the user to enter a passage. |
| System.out.print( "Enter passage: " ); |
| passage = in.readLine(); |
| |
| // If the user entered a blank line, then |
| // exit the loop. |
| if ( passage.length() == 0 ) |
| { |
| break; |
| } |
| // If there is no spell checker, then say so. |
| else if ( m_checker == null ) |
| { |
| System.out.println( "No spell checker available." ); |
| } |
| // Otherwise check passage and print misspelled words. |
| else |
| { |
| String[] errors = m_checker.check( passage ); |
| |
| if ( errors == null ) |
| { |
| System.out.println( "Passage is correct." ); |
| } |
| else |
| { |
| System.out.println( "Incorrect word(s):" ); |
| for ( int i = 0; i < errors.length; i++ ) |
| { |
| System.out.println( " " + errors[i] ); |
| } |
| } |
| } |
| } |
| } |
| catch ( Exception ex ) |
| { |
| } |
| } |
| |
| |
| /** |
| * Implements BundleActivator.stop(). Does nothing since the framework will |
| * automatically unget any used services. |
| * |
| * @param context the framework context for the bundle. |
| */ |
| public void stop( BundleContext context ) |
| { |
| // NOTE: The service is automatically released. |
| } |
| |
| |
| /** |
| * Implements ServiceListener.serviceChanged(). Checks to see if the service |
| * we are using is leaving or tries to get a service if we need one. |
| * |
| * @param event the fired service event. |
| */ |
| public void serviceChanged( ServiceEvent event ) |
| { |
| // If a spell check service was registered, see if we |
| // need one. If so, get a reference to it. |
| if ( event.getType() == ServiceEvent.REGISTERED ) |
| { |
| if ( m_ref == null ) |
| { |
| // Get a reference to the service object. |
| m_ref = event.getServiceReference(); |
| m_checker = ( SpellCheckService ) m_context.getService( m_ref ); |
| } |
| } |
| // If a spell check service was unregistered, see if it |
| // was the one we were using. If so, unget the service |
| // and try to query to get another one. |
| else if ( event.getType() == ServiceEvent.UNREGISTERING ) |
| { |
| if ( event.getServiceReference() == m_ref ) |
| { |
| // Unget service object and null references. |
| m_context.ungetService( m_ref ); |
| m_ref = null; |
| m_checker = null; |
| |
| // Query to see if we can get another service. |
| m_ref = m_context.getServiceReference( SpellCheckService.class.getName() ); |
| if ( m_ref != null ) |
| { |
| // Get a reference to the service object. |
| m_checker = ( SpellCheckService ) m_context.getService( m_ref ); |
| } |
| } |
| } |
| } |
| } |