org.bimserver.ifc.TracingGarbageCollector Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of shared Show documentation
Shared libraries, common parent for both BIMserver and BimServerClientLib
There is a newer version: 2.0.0
package org.bimserver.ifc;

/******************************************************************************
 * Copyright (C) 2009-2016  BIMserver.org
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see {@literal}.
 *****************************************************************************/

import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.bimserver.emf.IdEObject;
import org.eclipse.emf.ecore.EReference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import nl.tue.buildingsmart.schema.Attribute;
import nl.tue.buildingsmart.schema.EntityDefinition;
import nl.tue.buildingsmart.schema.InverseAttribute;
import nl.tue.buildingsmart.schema.SchemaDefinition;

public class TracingGarbageCollector {
	private static final Logger LOGGER = LoggerFactory.getLogger(TracingGarbageCollector.class);
	private final IfcModel ifcModel;
	private final Set referencedObjects = new HashSet();

	public TracingGarbageCollector(IfcModel ifcModel) {
		this.ifcModel = ifcModel;
	}

	@SuppressWarnings("rawtypes")
	public void mark(Set rootObjects) {
		referencedObjects.addAll(rootObjects);
		SchemaDefinition schema = ifcModel.getPackageMetaData().getSchemaDefinition();
		for (IdEObject rootObject : rootObjects) {
			for (EReference eReference : rootObject.eClass().getEAllReferences()) {
				Attribute attributeBNWithSuper = null;
				if (schema != null) {
					EntityDefinition entityBN = schema.getEntityBN(rootObject.eClass().getName());
					if (entityBN == null) {
						LOGGER.info(rootObject.eClass().getName() + " not found");
					} else {
						attributeBNWithSuper = entityBN.getAttributeBNWithSuper(eReference.getName());
						if (attributeBNWithSuper == null) {
							LOGGER.info(eReference.getName() + " not found");
						}
					}
				}
				if (schema == null || !(attributeBNWithSuper instanceof InverseAttribute)) {
					Object referredObject = rootObject.eGet(eReference);
					if (eReference.isMany()) {
						List list = (List) referredObject;
						for (Object o : list) {
							if (!referencedObjects.contains(o)) {
								mark(makeSet((IdEObject) o));
							}
						}
					} else {
						IdEObject referredIdEObject = (IdEObject) referredObject;
						if (referredIdEObject != null) {
							if (!referencedObjects.contains(referredObject)) {
								mark(makeSet(referredIdEObject));
							}
						}
					}
				}
			}
		}
	}

	private Set makeSet(IdEObject idEObject) {
		Set set = new HashSet();
		set.add(idEObject);
		return set;
	}
	
	public void sweep() {
		Map objects = ifcModel.getObjects();
		Iterator iterator = objects.keySet().iterator();
		while (iterator.hasNext()) {
			Long next = iterator.next();
			IdEObject idEObject = objects.get(next);
			if (!referencedObjects.contains(idEObject)) {
				iterator.remove();
			}
		}
	}
}