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/*
 * 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.
 */

package org.apache.zeppelin.display;

import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

/**
 *
 *
 */
public class AngularObjectRegistry {
  Map registry = new HashMap();
  private AngularObjectRegistryListener listener;
  private String interpreterId;

  AngularObjectListener angularObjectListener;

  public AngularObjectRegistry(final String interpreterId,
      final AngularObjectRegistryListener listener) {
    this.interpreterId = interpreterId;
    this.listener = listener;
    angularObjectListener = new AngularObjectListener() {
      @Override
      public void updated(AngularObject updatedObject) {
        if (listener != null) {
          listener.onUpdate(interpreterId, updatedObject);
        }
      }
    };
  }

  public AngularObjectRegistryListener getListener() {
    return listener;
  }

  public AngularObject add(String name, Object o) {
    return add(name, o, true);
  }

  public AngularObject add(String name, Object o, boolean emit) {
    AngularObject ao = createNewAngularObject(name, o);

    synchronized (registry) {
      registry.put(name, ao);
      if (listener != null && emit) {
        listener.onAdd(interpreterId, ao);
      }
    }

    return ao;
  }

  protected AngularObject createNewAngularObject(String name, Object o) {
    return new AngularObject(name, o, angularObjectListener);
  }

  protected AngularObjectListener getAngularObjectListener() {
    return angularObjectListener;
  }

  public AngularObject remove(String name) {
    synchronized (registry) {
      AngularObject o = registry.remove(name);
      if (listener != null) {
        listener.onRemove(interpreterId, o);;
      }
      return o;
    }
  }

  public AngularObject get(String name) {
    synchronized (registry) {
      return registry.get(name);
    }
  }

  public List getAll() {
    List all = new LinkedList();
    synchronized (registry) {
      all.addAll(registry.values());
    }
    return all;
  }

  public String getInterpreterGroupId() {
    return interpreterId;
  }
}