| /* |
| * 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.dictionaryclient; |
| |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| |
| import org.apache.felix.examples.dictionaryservice.DictionaryService; |
| |
| import org.osgi.framework.BundleActivator; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.ServiceReference; |
| |
| |
| /** |
| * This class implements a bundle that uses a dictionary service to check for |
| * the proper spelling of a word by check for its existence in the dictionary. |
| * This bundle uses the first service that it finds and does not monitor the |
| * dynamic availability of the service (i.e., it does not listen for the arrival |
| * or departure of dictionary services). When starting this bundle, the thread |
| * calling the start() method is used to read words from standard input. You can |
| * stop checking words by entering an empty line, but to start checking words |
| * again you must stop and then restart the bundle. |
| * |
| * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| */ |
| public class Activator implements BundleActivator |
| { |
| /** |
| * Implements BundleActivator.start(). Queries for all available dictionary |
| * services. If none are found it simply prints a message and returns, |
| * otherwise it reads words from standard input and checks for their |
| * existence from the first dictionary that it finds. (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 |
| { |
| // Query for all service references matching any language. |
| ServiceReference[] refs = context.getServiceReferences( DictionaryService.class.getName(), "(Language=*)" ); |
| |
| if ( refs != null ) |
| { |
| try |
| { |
| System.out.println( "Enter a blank line to exit." ); |
| BufferedReader in = new BufferedReader( new InputStreamReader( System.in ) ); |
| String word = ""; |
| |
| // Loop endlessly. |
| while ( true ) |
| { |
| // Ask the user to enter a word. |
| System.out.print( "Enter word: " ); |
| word = in.readLine(); |
| |
| // If the user entered a blank line, then |
| // exit the loop. |
| if ( word.length() == 0 ) |
| { |
| break; |
| } |
| |
| // First, get a dictionary service and then check |
| // if the word is correct. |
| DictionaryService dictionary = ( DictionaryService ) context.getService( refs[0] ); |
| if ( dictionary.checkWord( word ) ) |
| { |
| System.out.println( "Correct." ); |
| } |
| else |
| { |
| System.out.println( "Incorrect." ); |
| } |
| |
| // Unget the dictionary service. |
| context.ungetService( refs[0] ); |
| } |
| } |
| catch ( IOException ex ) |
| { |
| } |
| } |
| else |
| { |
| System.out.println( "Couldn't find any dictionary service..." ); |
| } |
| } |
| |
| |
| /** |
| * 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. |
| } |
| } |