/*
*
* * 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.io.IOException;
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.exception.OCommandExecutionException;
import com.orientechnologies.orient.core.metadata.schema.OClass;
/**
* SQL TRUNCATE CLASS command: Truncates an entire class deleting all configured clusters where the class relies on.
*
* @author Luca Garulli
*
*/
public class OCommandExecutorSQLTruncateClass extends OCommandExecutorSQLAbstract implements OCommandDistributedReplicateRequest {
public static final String KEYWORD_TRUNCATE = "TRUNCATE";
public static final String KEYWORD_CLASS = "CLASS";
private OClass schemaClass;
@SuppressWarnings("unchecked")
public OCommandExecutorSQLTruncateClass parse(final OCommandRequest iRequest) {
final ODatabaseRecord database = getDatabase();
init((OCommandRequestText) iRequest);
StringBuilder word = new StringBuilder();
int oldPos = 0;
int pos = nextWord(parserText, parserTextUpperCase, oldPos, word, true);
if (pos == -1 || !word.toString().equals(KEYWORD_TRUNCATE))
throw new OCommandSQLParsingException("Keyword " + KEYWORD_TRUNCATE + " not found. Use " + getSyntax(), parserText, oldPos);
oldPos = pos;
pos = nextWord(parserText, parserTextUpperCase, oldPos, word, true);
if (pos == -1 || !word.toString().equals(KEYWORD_CLASS))
throw new OCommandSQLParsingException("Keyword " + KEYWORD_CLASS + " not found. Use " + getSyntax(), parserText, oldPos);
oldPos = pos;
pos = nextWord(parserText, parserText, oldPos, word, true);
if (pos == -1)
throw new OCommandSQLParsingException("Expected class name. Use " + getSyntax(), parserText, oldPos);
final String className = word.toString();
schemaClass = database.getMetadata().getSchema().getClass(className);
if (schemaClass == null)
throw new OCommandSQLParsingException("Class '" + className + "' not found", parserText, oldPos);
return this;
}
/**
* Execute the command.
*/
public Object execute(final Map<Object, Object> iArgs) {
if (schemaClass == null)
throw new OCommandExecutionException("Cannot execute the command because it has not been parsed yet");
final long recs = schemaClass.count();
try {
schemaClass.truncate();
} catch (IOException e) {
throw new OCommandExecutionException("Error on executing command", e);
}
return recs;
}
@Override
public String getSyntax() {
return "TRUNCATE CLASS <class-name>";
}
}