Package com.orientechnologies.orient.core.sql

Source Code of com.orientechnologies.orient.core.sql.OCommandExecutorSQLAlterDatabase

/*
* 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.db.ODatabase;
import com.orientechnologies.orient.core.db.ODatabaseComplex;
import com.orientechnologies.orient.core.exception.OCommandExecutionException;
import com.orientechnologies.orient.core.metadata.schema.OClass;
import com.orientechnologies.orient.core.metadata.security.ODatabaseSecurityResources;
import com.orientechnologies.orient.core.metadata.security.ORole;

/**
* SQL ALTER DATABASE command: Changes an attribute of the current database.
*
* @author Luca Garulli
*
*/
@SuppressWarnings("unchecked")
public class OCommandExecutorSQLAlterDatabase extends OCommandExecutorSQLPermissionAbstract {
  public static final String    KEYWORD_ALTER      = "ALTER";
  public static final String    KEYWORD_DATABASE  = "DATABASE";

  private ODatabase.ATTRIBUTES  attribute;
  private String                value;

  public OCommandExecutorSQLAlterDatabase 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_DATABASE))
      throw new OCommandSQLParsingException("Keyword " + KEYWORD_DATABASE + " not found", text, oldPos);

    oldPos = pos;
    pos = OSQLHelper.nextWord(text, textUpperCase, oldPos, word, true);
    if (pos == -1)
      throw new OCommandSQLParsingException("Missed the database's attribute to change", text, oldPos);

    final String attributeAsString = word.toString();

    try {
      attribute = ODatabase.ATTRIBUTES.valueOf(attributeAsString.toUpperCase());
    } catch (IllegalArgumentException e) {
      throw new OCommandSQLParsingException("Unknown database'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 database's value to change for attribute '" + attribute + "'", text, oldPos);

    return this;
  }

  /**
   * Execute the ALTER DATABASE.
   */
  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");

    database.checkSecurity(ODatabaseSecurityResources.DATABASE, ORole.PERMISSION_UPDATE);

    ((ODatabaseComplex<?>) database).setInternal(attribute, value);
    return null;
  }
}
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