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package com.cedarsoft.utils;

import org.jetbrains.annotations.NotNull;

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

/**
 * Abstract base class for child detectors
 */
public abstract class AbstractChildDetector implements ChildDetector {
  @NotNull
  private final List> listeners = new ArrayList>();

  /**
   * Notifies the listeners that the children have been changed for the given parent
   *
   * @param parent the parent
   */
  protected void notifyChildrenChangedFor( @NotNull P parent ) {
    for ( ChildChangeListener listener : new ArrayList>( listeners ) ) {
      listener.notifyChildrenChangedFor( parent );
    }
  }

  public void addChangeListener( @NotNull ChildChangeListener
 changeListener ) {
    listeners.add( changeListener );
  }

  public void removeChangeListener( @NotNull ChildChangeListener changeListener ) {
    listeners.remove( changeListener );
  }
}