/*
*
* * 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.sql;
import java.util.Map;
import com.orientechnologies.orient.core.command.OCommandDistributedReplicateRequest;
import com.orientechnologies.orient.core.command.OCommandRequest;
import com.orientechnologies.orient.core.command.OCommandRequestText;
import com.orientechnologies.orient.core.db.record.ODatabaseRecord;
import com.orientechnologies.orient.core.db.record.ODatabaseRecordInternal;
import com.orientechnologies.orient.core.exception.OCommandExecutionException;
import com.orientechnologies.orient.core.metadata.schema.OClass;
/**
* SQL DROP CLUSTER command: Drop a cluster from the database
*
* @author Luca Garulli
*
*/
@SuppressWarnings("unchecked")
public class OCommandExecutorSQLDropCluster extends OCommandExecutorSQLAbstract implements OCommandDistributedReplicateRequest {
public static final String KEYWORD_DROP = "DROP";
public static final String KEYWORD_CLUSTER = "CLUSTER";
private String clusterName;
public OCommandExecutorSQLDropCluster parse(final OCommandRequest iRequest) {
init((OCommandRequestText) iRequest);
final StringBuilder word = new StringBuilder();
int oldPos = 0;
int pos = nextWord(parserText, parserTextUpperCase, oldPos, word, true);
if (pos == -1 || !word.toString().equals(KEYWORD_DROP))
throw new OCommandSQLParsingException("Keyword " + KEYWORD_DROP + " not found. Use " + getSyntax(), parserText, oldPos);
pos = nextWord(parserText, parserTextUpperCase, pos, word, true);
if (pos == -1 || !word.toString().equals(KEYWORD_CLUSTER))
throw new OCommandSQLParsingException("Keyword " + KEYWORD_CLUSTER + " not found. Use " + getSyntax(), parserText, oldPos);
pos = nextWord(parserText, parserTextUpperCase, pos, word, false);
if (pos == -1)
throw new OCommandSQLParsingException("Expected <cluster>. Use " + getSyntax(), parserText, pos);
clusterName = word.toString();
if (clusterName == null)
throw new OCommandSQLParsingException("Cluster is null. Use " + getSyntax(), parserText, pos);
return this;
}
/**
* Execute the DROP CLUSTER.
*/
public Object execute(final Map<Object, Object> iArgs) {
if (clusterName == null)
throw new OCommandExecutionException("Cannot execute the command because it has not been parsed yet");
final ODatabaseRecordInternal database = getDatabase();
// CHECK IF ANY CLASS IS USING IT
final int clusterId = database.getStorage().getClusterIdByName(clusterName);
for (OClass iClass : database.getMetadata().getSchema().getClasses()) {
for (int i : iClass.getClusterIds()) {
if (i == clusterId)
// IN USE
return false;
}
}
database.dropCluster(clusterId, true);
return true;
}
protected boolean isClusterDeletable(int clusterId) {
final ODatabaseRecord database = getDatabase();
for (OClass iClass : database.getMetadata().getSchema().getClasses()) {
for (int i : iClass.getClusterIds()) {
if (i == clusterId)
return false;
}
}
return true;
}
@Override
public String getSyntax() {
return "DROP CLUSTER <cluster>";
}
}