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/* 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 org.activiti.engine.impl.cfg;

import org.activiti.engine.delegate.DelegateHelper;

public enum DelegateExpressionFieldInjectionMode {

  /**
   * This is the pre version 5.21 mode: field expressions are allowed and the
   * only way to inject values.
   * 
   * Using the
   * {@link DelegateHelper#getField(org.activiti.engine.delegate.DelegateExecution, String)}
   * method is not possible when using this mode, unless the Expressions are still defined
   * as members of the delegate (otherwise an exception will be thrown). In that case, they
   * should not be used, but rather the DelegateHelper methods should be used.
   */
  COMPATIBILITY,

  /**
   * Allows injection when using delegateExpressions but will not throw an exception
   * when the fields are not defined on the delegate. This allows for mixed behaviours
   * where some delegates have injection (for example because they are not singletons)
   * and some don't.
   */
  MIXED,

  /**
   * (Advised mode, as it is the safest) 
   * 
   * Disables field injection when using delegateExpressions, no field injection will happen.
   */
  DISABLED

}