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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.parse;

import java.util.Collection;

import org.activiti.bpmn.model.BaseElement;
import org.activiti.engine.impl.bpmn.parser.BpmnParse;
import org.activiti.engine.impl.bpmn.parser.handler.AbstractBpmnParseHandler;
import org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl;

/**
 * Allows to hook into the parsing of one or more elements during the parsing of a BPMN 2.0 process.
 * For more details, see the userguide section on bpmn parse handlers.
 * 
 * Instances of this class can be injected into the {@link ProcessEngineConfigurationImpl}.
 * The handler will then be called whenever a BPMN 2.0 element is parsed that matches
 * the types returned by the {@link #getHandledTypes()} method.
 * 
 * @see AbstractBpmnParseHandler
 * 
 * @author Joram Barrez
 */
public interface BpmnParseHandler {
  
  /**
   * The types for which this handler must be calleding during process parsing.
   */
  Collection> getHandledTypes();
  
  /**
   * The actual delegation method. The parser will calls this method on a
   * match with the {@link #getHandledTypes()} return value.
   * @param bpmnParse The {@link BpmnParse} instance that acts as container
   *                  for all things produced during the parsing.
   */
  void parse(BpmnParse bpmnParse, BaseElement element);

}