/*
*
* * Copyright 2014 Orient Technologies LTD (info(at)orientechnologies.com)
* *
* * 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.
* *
* * For more information: http://www.orientechnologies.com
*
*/
package com.orientechnologies.orient.core.index;
import com.orientechnologies.orient.core.db.record.OIdentifiable;
import com.orientechnologies.orient.core.record.ORecord;
import com.orientechnologies.orient.core.record.impl.ODocument;
import com.orientechnologies.orient.core.storage.ORecordDuplicatedException;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
/**
* Index implementation that allows only one value for a key.
*
* @author Luca Garulli
*
*/
public class OIndexUnique extends OIndexOneValue {
public OIndexUnique(String typeId, String algorithm, OIndexEngine<OIdentifiable> engine, String valueContainerAlgorithm,
ODocument metadata) {
super(typeId, algorithm, engine, valueContainerAlgorithm, metadata);
}
@Override
public OIndexOneValue put(Object key, final OIdentifiable iSingleValue) {
checkForRebuild();
key = getCollatingValue(key);
modificationLock.requestModificationLock();
try {
checkForKeyType(key);
acquireExclusiveLock();
try {
final OIdentifiable value = indexEngine.get(key);
if (value != null) {
// CHECK IF THE ID IS THE SAME OF CURRENT: THIS IS THE UPDATE CASE
if (!value.equals(iSingleValue)) {
final Boolean mergeSameKey = metadata != null ? (Boolean) metadata.field(OIndex.MERGE_KEYS) : Boolean.FALSE;
if (mergeSameKey != null && mergeSameKey)
// IGNORE IT, THE EXISTENT KEY HAS BEEN MERGED
;
else
throw new ORecordDuplicatedException(String.format(
"Cannot index record %s: found duplicated key '%s' in index '%s' previously assigned to the record %s",
iSingleValue.getIdentity(), key, getName(), value.getIdentity()), value.getIdentity());
} else
return this;
}
if (!iSingleValue.getIdentity().isPersistent())
((ORecord) iSingleValue.getRecord()).save();
markStorageDirty();
indexEngine.put(key, iSingleValue.getIdentity());
return this;
} finally {
releaseExclusiveLock();
}
} finally {
modificationLock.releaseModificationLock();
}
}
@Override
public boolean canBeUsedInEqualityOperators() {
return true;
}
@Override
public boolean supportsOrderedIterations() {
return indexEngine.hasRangeQuerySupport();
}
@Override
protected void putInSnapshot(Object key, OIdentifiable value, Map<Object, Object> snapshot) {
key = getCollatingValue(key);
Object snapshotValue = snapshot.get(key);
if (snapshotValue == null) {
final OIdentifiable storedValue = indexEngine.get(key);
final Set<OIdentifiable> values = new LinkedHashSet<OIdentifiable>();
if (storedValue != null)
values.add(storedValue.getIdentity());
values.add(value.getIdentity());
snapshot.put(key, values);
} else if (snapshotValue instanceof Set) {
final Set<OIdentifiable> values = (Set<OIdentifiable>) snapshotValue;
values.add(value.getIdentity());
} else {
final Set<OIdentifiable> values = new LinkedHashSet<OIdentifiable>();
values.add(value);
snapshot.put(key, values);
}
}
@Override
protected void removeFromSnapshot(Object key, OIdentifiable value, Map<Object, Object> snapshot) {
key = getCollatingValue(key);
Object snapshotValue = snapshot.get(key);
if (snapshotValue instanceof Set) {
final Set<OIdentifiable> values = (Set<OIdentifiable>) snapshotValue;
if (values.isEmpty())
snapshot.put(key, RemovedValue.INSTANCE);
else
values.remove(value);
} else
snapshot.put(key, RemovedValue.INSTANCE);
}
@Override
protected void commitSnapshot(Map<Object, Object> snapshot) {
for (Map.Entry<Object, Object> snapshotEntry : snapshot.entrySet()) {
Object key = snapshotEntry.getKey();
checkForKeyType(key);
Object snapshotValue = snapshotEntry.getValue();
if (snapshotValue instanceof Set) {
Set<OIdentifiable> values = (Set<OIdentifiable>) snapshotValue;
if (values.isEmpty())
continue;
final Iterator<OIdentifiable> valuesIterator = values.iterator();
if (values.size() > 1) {
final OIdentifiable valueOne = valuesIterator.next();
final OIdentifiable valueTwo = valuesIterator.next();
throw new ORecordDuplicatedException(String.format(
"Cannot index record %s: found duplicated key '%s' in index '%s' previously assigned to the record %s",
valueTwo.getIdentity(), key, getName(), valueOne.getIdentity()), valueOne.getIdentity());
}
final OIdentifiable value = valuesIterator.next();
indexEngine.put(key, value.getIdentity());
} else if (snapshotValue.equals(RemovedValue.INSTANCE))
indexEngine.remove(key);
else
assert false : "Provided value can not be committed";
}
}
}