| /** |
| * 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.netbeans.modules.tasklist.impl; |
| |
| import java.beans.PropertyChangeListener; |
| import java.beans.PropertyChangeSupport; |
| import java.util.ArrayList; |
| import java.util.List; |
| import org.netbeans.modules.tasklist.filter.TaskFilter; |
| import org.netbeans.spi.tasklist.FileTaskScanner; |
| import org.netbeans.spi.tasklist.PushTaskScanner; |
| import org.openide.util.Lookup; |
| import org.openide.util.LookupEvent; |
| import org.openide.util.LookupListener; |
| import org.openide.util.lookup.Lookups; |
| |
| /** |
| * |
| * @author S. Aubrecht |
| */ |
| public final class ScannerList <T> { |
| |
| public static final String PROP_TASK_SCANNERS = "TaskScannerList"; //NOI18N |
| |
| private static final String SCANNER_LIST_PATH = "TaskList/Scanners"; //NOI18N |
| |
| private static ScannerList<FileTaskScanner> fileInstance; |
| private static ScannerList<PushTaskScanner> pushInstance; |
| |
| private PropertyChangeSupport propertySupport; |
| |
| private Lookup.Result<T> lkpResult; |
| |
| private List<T> scanners; |
| private Class<T> clazz; |
| |
| /** Creates a new instance of ProviderList */ |
| private ScannerList( Class<T> clazz ) { |
| this.clazz = clazz; |
| } |
| |
| public static ScannerList<FileTaskScanner> getFileScannerList() { |
| if( null == fileInstance ) { |
| fileInstance = new ScannerList<FileTaskScanner>( FileTaskScanner.class ); |
| } |
| return fileInstance; |
| } |
| |
| public static List<FileTaskScanner> getFileScanners(TaskFilter filter) { |
| if( null == fileInstance ) { |
| fileInstance = new ScannerList<FileTaskScanner>( FileTaskScanner.class ); |
| } |
| if(fileInstance.scanners == null){ |
| fileInstance.init(); |
| } |
| ArrayList<FileTaskScanner> result = new ArrayList<FileTaskScanner>(fileInstance.scanners.size()); |
| for( FileTaskScanner scanner : fileInstance.getScanners() ) { |
| if( filter.isEnabled(scanner) ) { |
| result.add( scanner ); |
| } |
| } |
| return result; |
| } |
| |
| public static ScannerList<PushTaskScanner> getPushScannerList() { |
| if( null == pushInstance ) { |
| pushInstance = new ScannerList<PushTaskScanner>( PushTaskScanner.class ); |
| } |
| return pushInstance; |
| } |
| |
| public List<? extends T> getScanners() { |
| init(); |
| return scanners; |
| } |
| |
| // private Class<? extends T> getCheckedClass() { |
| // return T.class; |
| // } |
| |
| private void init() { |
| if( null == scanners ) { |
| if( null == lkpResult ) { |
| lkpResult = initLookup(); |
| lkpResult.addLookupListener( new LookupListener() { |
| public void resultChanged(LookupEvent ev) { |
| scanners = null; |
| firePropertyChange(); |
| } |
| }); |
| } |
| scanners = new ArrayList<T>( lkpResult.allInstances() ); |
| } |
| } |
| |
| public void addPropertyChangeListener( PropertyChangeListener pcl ) { |
| if( null == propertySupport ) |
| propertySupport = new PropertyChangeSupport( this ); |
| propertySupport.addPropertyChangeListener( pcl ); |
| } |
| |
| public void removePropertyChangeListener( PropertyChangeListener pcl ) { |
| if( null != propertySupport ) |
| propertySupport.removePropertyChangeListener( pcl ); |
| } |
| |
| private void firePropertyChange() { |
| if( null != propertySupport ) { |
| propertySupport.firePropertyChange( PROP_TASK_SCANNERS, null, getScanners() ); |
| } |
| } |
| |
| private Lookup.Result<T> initLookup() { |
| Lookup lkp = Lookups.forPath( SCANNER_LIST_PATH ); |
| |
| Lookup.Template<T> template = new Lookup.Template<T>( clazz ); |
| Lookup.Result<T> res = lkp.lookup( template ); |
| return res; |
| } |
| } |