/*
*
* * 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.common.log.OLogManager;
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.exception.OCommandExecutionException;
import com.orientechnologies.orient.core.index.OIndex;
import com.orientechnologies.orient.core.index.OIndexManagerProxy;
import com.orientechnologies.orient.core.metadata.schema.OClass;
import com.orientechnologies.orient.core.metadata.schema.OSchemaProxy;
import com.orientechnologies.orient.core.storage.OCluster;
/**
* SQL DROP CLASS command: Drops a class from the database. Cluster associated are removed too if are used exclusively by the
* deleting class.
*
* @author Luca Garulli
*
*/
@SuppressWarnings("unchecked")
public class OCommandExecutorSQLDropClass extends OCommandExecutorSQLAbstract implements OCommandDistributedReplicateRequest {
public static final String KEYWORD_DROP = "DROP";
public static final String KEYWORD_CLASS = "CLASS";
private String className;
public OCommandExecutorSQLDropClass 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_CLASS))
throw new OCommandSQLParsingException("Keyword " + KEYWORD_CLASS + " not found. Use " + getSyntax(), parserText, oldPos);
pos = nextWord(parserText, parserTextUpperCase, pos, word, false);
if (pos == -1)
throw new OCommandSQLParsingException("Expected <class>. Use " + getSyntax(), parserText, pos);
className = word.toString();
return this;
}
/**
* Execute the DROP CLASS.
*/
public Object execute(final Map<Object, Object> iArgs) {
if (className == null)
throw new OCommandExecutionException("Cannot execute the command because it has not been parsed yet");
final ODatabaseRecord database = getDatabase();
final OClass oClass = database.getMetadata().getSchema().getClass(className);
if (oClass == null)
return null;
database.getMetadata().getSchema().dropClass(className);
return true;
}
@Override
public String getSyntax() {
return "DROP CLASS <class>";
}
}