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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
   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
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   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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  package org.apache.cayenne.commitlog;
  
  import org.apache.cayenne.ObjectId;
  import org.apache.cayenne.graph.ArcId;
  import org.apache.cayenne.graph.GraphChangeHandler;
  import org.apache.cayenne.commitlog.meta.CommitLogEntity;
  import org.apache.cayenne.commitlog.meta.CommitLogEntityFactory;
  
  /**
   * Filters changes passing only auditable object changes to the underlying
   * delegate.
   */
  class DiffFilter implements GraphChangeHandler {
  
  	private CommitLogEntityFactory entityFactory;
  	private GraphChangeHandler delegate;
  
  	DiffFilter(CommitLogEntityFactory entityFactory, GraphChangeHandler delegate) {
  		this.entityFactory = entityFactory;
  		this.delegate = delegate;
  	}
  
  	@Override
  	public void nodeIdChanged(Object nodeId, Object newId) {
  		if (entityFactory.getEntity((ObjectId) nodeId).isIncluded()) {
  			delegate.nodeIdChanged(nodeId, newId);
  		}
  	}
  
  	@Override
  	public void nodeCreated(Object nodeId) {
  		if (entityFactory.getEntity((ObjectId) nodeId).isIncluded()) {
  			delegate.nodeCreated(nodeId);
  		}
  	}
  
  	@Override
  	public void nodeRemoved(Object nodeId) {
  		if (entityFactory.getEntity((ObjectId) nodeId).isIncluded()) {
  			delegate.nodeRemoved(nodeId);
  		}
  	}
  
  	@Override
  	public void nodePropertyChanged(Object nodeId, String property, Object oldValue, Object newValue) {
  		CommitLogEntity entity = entityFactory.getEntity((ObjectId) nodeId);
  		if (entity.isIncluded(property)) {
  
  			if (entity.isConfidential(property)) {
  				oldValue = Confidential.getInstance();
  				newValue = Confidential.getInstance();
  			}
  
  			delegate.nodePropertyChanged(nodeId, property, oldValue, newValue);
  		}
  	}
  
  	@Override
  	public void arcCreated(Object nodeId, Object targetNodeId, ArcId arcId) {
  		if (entityFactory.getEntity((ObjectId) nodeId).isIncluded(arcId.toString())) {
  			delegate.arcCreated(nodeId, targetNodeId, arcId);
  		}
  	}
  
  	@Override
  	public void arcDeleted(Object nodeId, Object targetNodeId, ArcId arcId) {
  		if (entityFactory.getEntity((ObjectId) nodeId).isIncluded(arcId.toString())) {
  			delegate.arcDeleted(nodeId, targetNodeId, arcId);
  		}
  	}
  }
  