/*
* Copyright (c) 2012,2013 Big Switch Networks, Inc.
*
* Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/legal/epl-v10.html
*
* 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.
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Originally created by David Erickson, Stanford University
*
* 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.sdnplatform.devicemanager.internal;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.sdnplatform.devicemanager.IDeviceService.DeviceField;
import org.sdnplatform.util.IterableIterator;
/**
* An index that maps key fields of an entity to device keys, with multiple
* device keys allowed per entity
*/
public class DeviceMultiIndex extends DeviceIndex {
/**
* The index
*/
private ConcurrentHashMap<IndexedEntity, Collection<Long>> index;
/**
* @param keyFields
*/
public DeviceMultiIndex(EnumSet<DeviceField> keyFields) {
super(keyFields);
index = new ConcurrentHashMap<IndexedEntity, Collection<Long>>();
}
// ***********
// DeviceIndex
// ***********
@Override
public Iterator<Long> queryByEntity(Entity entity) {
IndexedEntity ie = new IndexedEntity(keyFields, entity);
Collection<Long> devices = index.get(ie);
if (devices != null)
return devices.iterator();
return Collections.<Long>emptySet().iterator();
}
@Override
public Iterator<Long> getAll() {
Iterator<Collection<Long>> iter = index.values().iterator();
return new IterableIterator<Long>(iter);
}
@Override
public boolean updateIndex(Device device, Long deviceKey) {
for (Entity e : device.entities) {
updateIndex(e, deviceKey);
}
return true;
}
@Override
public void updateIndex(Entity entity, Long deviceKey) {
Collection<Long> devices = null;
IndexedEntity ie = new IndexedEntity(keyFields, entity);
if (!ie.hasNonNullKeys()) return;
devices = index.get(ie);
if (devices == null) {
Map<Long,Boolean> chm = new ConcurrentHashMap<Long,Boolean>();
devices = Collections.newSetFromMap(chm);
Collection<Long> r = index.putIfAbsent(ie, devices);
if (r != null)
devices = r;
}
devices.add(deviceKey);
}
@Override
public void removeEntity(Entity entity) {
IndexedEntity ie = new IndexedEntity(keyFields, entity);
index.remove(ie);
}
@Override
public void removeEntity(Entity entity, Long deviceKey) {
IndexedEntity ie = new IndexedEntity(keyFields, entity);
Collection<Long> devices = index.get(ie);
if (devices != null)
devices.remove(deviceKey);
}
}