/*
* Copyright 1999-2010 Luca Garulli (l.garulli--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.
*/
package com.orientechnologies.orient.core.sql;
import java.util.Arrays;
import java.util.Map;
import com.orientechnologies.orient.core.command.OCommandRequestText;
import com.orientechnologies.orient.core.exception.OCommandExecutionException;
import com.orientechnologies.orient.core.metadata.schema.OClass;
import com.orientechnologies.orient.core.metadata.schema.OClass.ATTRIBUTES;
import com.orientechnologies.orient.core.metadata.schema.OClassImpl;
import com.orientechnologies.orient.core.metadata.security.ODatabaseSecurityResources;
import com.orientechnologies.orient.core.metadata.security.ORole;
/**
* SQL ALTER PROPERTY command: Changes an attribute of an existent property in the target class.
*
* @author Luca Garulli
*
*/
@SuppressWarnings("unchecked")
public class OCommandExecutorSQLAlterClass extends OCommandExecutorSQLPermissionAbstract {
public static final String KEYWORD_ALTER = "ALTER";
public static final String KEYWORD_CLASS = "CLASS";
private String className;
private ATTRIBUTES attribute;
private String value;
public OCommandExecutorSQLAlterClass parse(final OCommandRequestText iRequest) {
iRequest.getDatabase().checkSecurity(ODatabaseSecurityResources.COMMAND, ORole.PERMISSION_UPDATE);
init(iRequest.getDatabase(), iRequest.getText());
StringBuilder word = new StringBuilder();
int oldPos = 0;
int pos = OSQLHelper.nextWord(text, textUpperCase, oldPos, word, true);
if (pos == -1 || !word.toString().equals(KEYWORD_ALTER))
throw new OCommandSQLParsingException("Keyword " + KEYWORD_ALTER + " not found", text, oldPos);
oldPos = pos;
pos = OSQLHelper.nextWord(text, textUpperCase, oldPos, word, true);
if (pos == -1 || !word.toString().equals(KEYWORD_CLASS))
throw new OCommandSQLParsingException("Keyword " + KEYWORD_CLASS + " not found", text, oldPos);
oldPos = pos;
pos = OSQLHelper.nextWord(text, textUpperCase, oldPos, word, false);
if (pos == -1)
throw new OCommandSQLParsingException("Expected <class>", text, oldPos);
className = word.toString();
oldPos = pos;
pos = OSQLHelper.nextWord(text, textUpperCase, oldPos, word, true);
if (pos == -1)
throw new OCommandSQLParsingException("Missed the class's attribute to change", text, oldPos);
final String attributeAsString = word.toString();
try {
attribute = OClass.ATTRIBUTES.valueOf(attributeAsString.toUpperCase());
} catch (IllegalArgumentException e) {
throw new OCommandSQLParsingException("Unknown class's attribute '" + attributeAsString + "'. Supported attributes are: "
+ Arrays.toString(OClass.ATTRIBUTES.values()), text, oldPos);
}
value = text.substring(pos + 1).trim();
if (value.length() == 0)
throw new OCommandSQLParsingException("Missed the property's value to change for attribute '" + attribute + "'", text, oldPos);
return this;
}
/**
* Execute the ALTER CLASS.
*/
public Object execute(final Map<Object, Object> iArgs) {
if (attribute == null)
throw new OCommandExecutionException("Can't execute the command because it hasn't been parsed yet");
final OClassImpl cls = (OClassImpl) database.getMetadata().getSchema().getClass(className);
if (cls == null)
throw new OCommandExecutionException("Source class '" + className + "' not found");
cls.setInternalAndSave(attribute, value);
renameCluster();
return null;
}
private void renameCluster() {
if (attribute.equals(OClass.ATTRIBUTES.NAME) && checkClusterRenameOk(database.getStorage().getClusterIdByName(value))) {
database.command(new OCommandSQL("alter cluster " + className + " name " + value)).execute();
}
}
private boolean checkClusterRenameOk(int clusterId) {
for (OClass clazz : database.getMetadata().getSchema().getClasses()) {
if (clazz.getName().equals(value))
continue;
else if (clazz.getDefaultClusterId() == clusterId || Arrays.asList(clazz.getClusterIds()).contains(clusterId))
return false;
}
return true;
}
}