/*
* Copyright 2013 MovingBlocks
*
* 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.terasology.entitySystem.entity.internal;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import gnu.trove.iterator.TIntIterator;
import gnu.trove.iterator.TIntObjectIterator;
import gnu.trove.map.TIntObjectMap;
import gnu.trove.map.hash.TIntObjectHashMap;
import gnu.trove.set.TIntSet;
import gnu.trove.set.hash.TIntHashSet;
import org.terasology.entitySystem.Component;
import java.util.List;
import java.util.Map;
/**
* A table for storing entities and components. Focused on allowing iteration across a components of a given type
*
* @author Immortius <immortius@gmail.com>
*/
class ComponentTable {
private Map<Class, TIntObjectMap<Component>> store = Maps.newConcurrentMap();
public <T extends Component> T get(int entityId, Class<T> componentClass) {
TIntObjectMap<Component> entityMap = store.get(componentClass);
if (entityMap != null) {
return componentClass.cast(entityMap.get(entityId));
}
return null;
}
public Component put(int entityId, Component component) {
TIntObjectMap<Component> entityMap = store.get(component.getClass());
if (entityMap == null) {
entityMap = new TIntObjectHashMap<Component>();
store.put(component.getClass(), entityMap);
}
return entityMap.put(entityId, component);
}
public <T extends Component> Component remove(int entityId, Class<T> componentClass) {
TIntObjectMap<Component> entityMap = store.get(componentClass);
if (entityMap != null) {
return entityMap.remove(entityId);
}
return null;
}
public void remove(int entityId) {
for (TIntObjectMap<Component> entityMap : store.values()) {
entityMap.remove(entityId);
}
}
public void clear() {
store.clear();
}
public int getComponentCount(Class<? extends Component> componentClass) {
TIntObjectMap<Component> map = store.get(componentClass);
return (map == null) ? 0 : map.size();
}
public Iterable<Component> iterateComponents(int entityId) {
List<Component> components = Lists.newArrayList();
for (TIntObjectMap<Component> componentMap : store.values()) {
Component comp = componentMap.get(entityId);
if (comp != null) {
components.add(comp);
}
}
return components;
}
public <T extends Component> TIntObjectIterator<T> componentIterator(Class<T> componentClass) {
TIntObjectMap<T> entityMap = (TIntObjectMap<T>) store.get(componentClass);
if (entityMap != null) {
return entityMap.iterator();
}
return null;
}
/**
* Produces an iterator for iterating over all entities
* <p/>
* This is not designed to be performant, and in general usage entities should not be iterated over.
*
* @return An iterator over all entity ids.
*/
public TIntIterator entityIdIterator() {
TIntSet idSet = new TIntHashSet();
for (TIntObjectMap<Component> componentMap : store.values()) {
idSet.addAll(componentMap.keys());
}
return idSet.iterator();
}
public int numEntities() {
TIntSet idSet = new TIntHashSet();
for (TIntObjectMap<Component> componentMap : store.values()) {
idSet.addAll(componentMap.keys());
}
return idSet.size();
}
}