/*
*
* * 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.Arrays;
import java.util.Locale;
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.exception.OCommandExecutionException;
import com.orientechnologies.orient.core.metadata.schema.OClassImpl;
import com.orientechnologies.orient.core.metadata.schema.OProperty;
import com.orientechnologies.orient.core.metadata.schema.OProperty.ATTRIBUTES;
import com.orientechnologies.orient.core.metadata.schema.OPropertyImpl;
/**
* SQL ALTER PROPERTY command: Changes an attribute of an existent property in the target class.
*
* @author Luca Garulli
*
*/
@SuppressWarnings("unchecked")
public class OCommandExecutorSQLAlterProperty extends OCommandExecutorSQLAbstract implements OCommandDistributedReplicateRequest {
public static final String KEYWORD_ALTER = "ALTER";
public static final String KEYWORD_PROPERTY = "PROPERTY";
private String className;
private String fieldName;
private ATTRIBUTES attribute;
private String value;
public OCommandExecutorSQLAlterProperty parse(final OCommandRequest iRequest) {
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_ALTER))
throw new OCommandSQLParsingException("Keyword " + KEYWORD_ALTER + " not found. Use " + getSyntax(), parserText, oldPos);
oldPos = pos;
pos = nextWord(parserText, parserTextUpperCase, oldPos, word, true);
if (pos == -1 || !word.toString().equals(KEYWORD_PROPERTY))
throw new OCommandSQLParsingException("Keyword " + KEYWORD_PROPERTY + " not found. Use " + getSyntax(), parserText, oldPos);
oldPos = pos;
pos = nextWord(parserText, parserTextUpperCase, oldPos, word, false);
if (pos == -1)
throw new OCommandSQLParsingException("Expected <class>.<property>. Use " + getSyntax(), parserText, oldPos);
String[] parts = word.toString().split("\\.");
if (parts.length != 2)
throw new OCommandSQLParsingException("Expected <class>.<property>. Use " + getSyntax(), parserText, oldPos);
className = parts[0];
if (className == null)
throw new OCommandSQLParsingException("Class not found", parserText, oldPos);
fieldName = parts[1];
oldPos = pos;
pos = nextWord(parserText, parserTextUpperCase, oldPos, word, true);
if (pos == -1)
throw new OCommandSQLParsingException("Missing property attribute to change. Use " + getSyntax(), parserText, oldPos);
final String attributeAsString = word.toString();
try {
attribute = OProperty.ATTRIBUTES.valueOf(attributeAsString.toUpperCase(Locale.ENGLISH));
} catch (IllegalArgumentException e) {
throw new OCommandSQLParsingException("Unknown property attribute '" + attributeAsString + "'. Supported attributes are: "
+ Arrays.toString(OProperty.ATTRIBUTES.values()), parserText, oldPos);
}
value = parserText.substring(pos + 1).trim();
if (value.length() == 0)
throw new OCommandSQLParsingException("Missing property value to change for attribute '" + attribute + "'. Use "
+ getSyntax(), parserText, oldPos);
if (value.equalsIgnoreCase("null"))
value = null;
return this;
}
/**
* Execute the ALTER PROPERTY.
*/
public Object execute(final Map<Object, Object> iArgs) {
if (attribute == null)
throw new OCommandExecutionException("Cannot execute the command because it has not yet been parsed");
final OClassImpl sourceClass = (OClassImpl) getDatabase().getMetadata().getSchema().getClass(className);
if (sourceClass == null)
throw new OCommandExecutionException("Source class '" + className + "' not found");
final OPropertyImpl prop = (OPropertyImpl) sourceClass.getProperty(fieldName);
if (prop == null)
throw new OCommandExecutionException("Property '" + className + "." + fieldName + "' not exists");
prop.set(attribute, value);
return null;
}
public String getSyntax() {
return "ALTER PROPERTY <class>.<property> <attribute-name> <attribute-value>";
}
}