/*
* Copyright (c) 2008-2013, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.query.impl;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.query.IndexAwarePredicate;
import com.hazelcast.query.Predicate;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicReference;
public class IndexService {
private final ConcurrentMap<String, Index> mapIndexes = new ConcurrentHashMap<String, Index>(3);
private final AtomicReference<Index[]> indexes = new AtomicReference<Index[]>();
private volatile boolean hasIndex = false;
public synchronized Index destroyIndex(String attribute) {
return mapIndexes.remove(attribute);
}
public synchronized Index addOrGetIndex(String attribute, boolean ordered) {
Index index = mapIndexes.get(attribute);
if (index != null) return index;
index = new IndexImpl(attribute, ordered);
mapIndexes.put(attribute, index);
Object[] indexObjects = mapIndexes.values().toArray();
Index[] newIndexes = new Index[indexObjects.length];
for (int i = 0; i < indexObjects.length; i++) {
newIndexes[i] = (Index) indexObjects[i];
}
indexes.set(newIndexes);
hasIndex = true;
return index;
}
public Index[] getIndexes() {
return indexes.get();
}
public void removeEntryIndex(Data indexKey) throws QueryException {
for (Index index : indexes.get()) {
index.removeEntryIndex(indexKey);
}
}
public boolean hasIndex() {
return hasIndex;
}
public void saveEntryIndex(QueryableEntry queryableEntry) throws QueryException {
for (Index index : indexes.get()) {
index.saveEntryIndex(queryableEntry);
}
}
Index getIndex(String attribute) {
return mapIndexes.get(attribute);
}
public Set<QueryableEntry> query(Predicate predicate) {
if (hasIndex) {
QueryContext queryContext = new QueryContext(this);
if (predicate instanceof IndexAwarePredicate) {
IndexAwarePredicate iap = (IndexAwarePredicate) predicate;
if (iap.isIndexed(queryContext)) {
return iap.filter(queryContext);
}
}
}
return null;
}
}