1 /*******************************************************************************
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2 * Copyright (c) 2010, 2011 Association for Decentralized Information Management in
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.browsing.ui.model.children;
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14 import java.util.Collection;
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16 import org.simantics.db.ReadGraph;
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17 import org.simantics.db.exception.DatabaseException;
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20 * A child rule is a part of child contribution that tells how the child nodes are found.
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21 * @author Hannu Niemistö
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23 public interface ChildRule {
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25 * Checks if the child rule is compatible with the content type.
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26 * Because this check is made when contribution is created,
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27 * the type of the parent content is not checked anymore in getChildren.
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29 boolean isCompatible(Class<?> contentType);
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32 * Given parent content produces child contents.
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34 Collection<?> getChildren(ReadGraph graph, Object parent) throws DatabaseException;
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37 * Given child content produces possible parent contents.
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39 Collection<?> getParents(ReadGraph graph, Object child) throws DatabaseException;
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