package org.apache.lucene.queryparser.flexible.aqp.config;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

import java.util.ArrayList;
import java.util.List;

import org.apache.lucene.queryparser.flexible.core.nodes.QueryNode;
import org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessor;
import org.apache.lucene.util.AttributeImpl;
import org.apache.lucene.util.AttributeReflector;
import org.apache.lucene.queryparser.flexible.aqp.config.AqpFeedbackEventHandler.ACTION;

public class AqpFeedbackImpl extends AttributeImpl implements AqpFeedback {

  private static final long serialVersionUID = 5178148416076100953L;

  private List<AqpFeedbackEvent> events = new ArrayList<AqpFeedbackEvent>();
  private List<AqpFeedbackEventHandler> handlers = new ArrayList<AqpFeedbackEventHandler>();

  @Override
  public void clear() {
    events.clear();
  }

  @Override
  public void copyTo(AttributeImpl target) {
    throw new UnsupportedOperationException();
  }

  public void registerEventHandler(AqpFeedbackEventHandler handler) {
    handlers.add(handler);
  }

  public AqpFeedbackEvent createEvent(TYPE level,
      Class<? extends QueryNodeProcessor> qnClass, QueryNode node, String msg,
      Object... args) {
    return new AqpFeedbackEventImpl(level, qnClass, node, msg, args);
  }

  public void sendEvent(AqpFeedbackEvent event) {
    for (AqpFeedbackEventHandler handler : handlers) {
      ACTION r = handler.handle(event);
      if (r == ACTION.STOP) {
        return;
      } else if (r == ACTION.SAVE_EVENT) {
        if (!events.contains(event)) {
          events.add(event);
        }
      }
    }
  }

  @Override
  public void reflectWith(AttributeReflector reflector) {
    for (AqpFeedbackEvent ev: events) {
      reflector.reflect(AqpFeedback.class, "feedback", ev.getType());
    };
  }

}