org.kurento.tree.server.kms.Element Maven / Gradle / Ivy

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/*
 * (C) Copyright 2016 Kurento (http://kurento.org/)
 *
 * 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.kurento.tree.server.kms;

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

public abstract class Element extends KurentoObj {

  private Pipeline pipeline;
  private List sinks = new ArrayList<>();
  private Element source;

  public Element(Pipeline pipeline) {
    this.pipeline = pipeline;
  }

  public void connect(Element element) {

    checkReleased();

    if (this.getPipeline() != element.getPipeline()) {
      throw new RuntimeException("Elements from different pipelines can not be connected");
    }

    this.sinks.add(element);
    element.setSource(this);
  }

  public void disconnect() {

    checkReleased();

    if (source != null) {
      this.source.sinks.remove(this);
    }
    this.source = null;
  }

  void setSource(Element source) {
    checkReleased();
    this.source = source;
  }

  public List getSinks() {
    checkReleased();
    return sinks;
  }

  public Pipeline getPipeline() {
    checkReleased();
    return pipeline;
  }

  public Element getSource() {
    checkReleased();
    return source;
  }

  public void release() {
    disconnect();
    for (Element element : new ArrayList<>(getSinks())) { // To avoid
      // concurrent
      // modification
      // exception
      element.disconnect();
    }
    pipeline.removeElement(this);
    super.release();
  }

  public String getId() {
    return getLabel();
  }

}