/*
* Copyright 2011 Google Inc.
*
* 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 com.google.android.apps.mytracks.content;
import android.util.Log;
import java.util.EnumMap;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
/**
* Manages register/unregister {@link TrackDataListener} and keeping the state
* for each registered listener.
*
* @author Rodrigo Damazio
*/
public class TrackDataManager {
private static final String TAG = TrackDataManager.class.getSimpleName();
// Map of listener to its track data types
private final Map<TrackDataListener, EnumSet<TrackDataType>>
listenerToTypesMap = new HashMap<TrackDataListener, EnumSet<TrackDataType>>();
// Map of track data type to listeners
private final Map<TrackDataType, Set<TrackDataListener>>
typeToListenersMap = new EnumMap<TrackDataType, Set<TrackDataListener>>(TrackDataType.class);
public TrackDataManager() {
for (TrackDataType trackDataType : TrackDataType.values()) {
typeToListenersMap.put(trackDataType, new LinkedHashSet<TrackDataListener>());
}
}
/**
* Registers a listener.
*
* @param listener the listener
* @param trackDataTypes the track data types the listener is interested
*/
public void registerListener(
TrackDataListener listener, EnumSet<TrackDataType> trackDataTypes) {
if (listenerToTypesMap.containsKey(listener)) {
Log.w(TAG, "Tried to register a listener that is already registered. Ignore.");
return;
}
listenerToTypesMap.put(listener, trackDataTypes);
for (TrackDataType trackDataType : trackDataTypes) {
typeToListenersMap.get(trackDataType).add(listener);
}
}
/**
* Unregisters a listener.
*
* @param listener the listener
*/
public void unregisterListener(TrackDataListener listener) {
EnumSet<TrackDataType> removedTypes = listenerToTypesMap.remove(listener);
if (removedTypes == null) {
Log.w(TAG, "Tried to unregister a listener that is not registered. Ignore.");
return;
}
// Remove the listener from the typeToListenersMap
for (TrackDataType trackDataType : removedTypes) {
typeToListenersMap.get(trackDataType).remove(listener);
}
}
/**
* Gets the number of {@link TrackDataListener}.
*/
public int getNumberOfListeners() {
return listenerToTypesMap.size();
}
/**
* Gets the track data types for a listener.
*
* @param listener the listener
*/
public EnumSet<TrackDataType> getTrackDataTypes(TrackDataListener listener) {
return listenerToTypesMap.get(listener);
}
/**
* Gets the listeners for a {@link TrackDataType}.
*
* @param type the type
*/
public Set<TrackDataListener> getListeners(TrackDataType type) {
return typeToListenersMap.get(type);
}
/**
* Gets all the registered {@link TrackDataType}.
*/
public EnumSet<TrackDataType> getRegisteredTrackDataTypes() {
EnumSet<TrackDataType> types = EnumSet.noneOf(TrackDataType.class);
for (EnumSet<TrackDataType> value : listenerToTypesMap.values()) {
types.addAll(value);
}
return types;
}
}