X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;ds=sidebyside;f=bundles%2Forg.simantics.browsing.ui.model%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fmodel%2Fchildren%2FChildRule.java;fp=bundles%2Forg.simantics.browsing.ui.model%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fmodel%2Fchildren%2FChildRule.java;h=6cb8b03258e4f46b279194e3b1e467fecd983067;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/children/ChildRule.java b/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/children/ChildRule.java
new file mode 100644
index 000000000..6cb8b0325
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+++ b/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/children/ChildRule.java
@@ -0,0 +1,40 @@
+/*******************************************************************************
+ * Copyright (c) 2010, 2011 Association for Decentralized Information Management in
+ * Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.browsing.ui.model.children;
+
+import java.util.Collection;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.exception.DatabaseException;
+
+/**
+ * A child rule is a part of child contribution that tells how the child nodes are found.
+ * @author Hannu Niemistö
+ */
+public interface ChildRule {
+    /**
+     * Checks if the child rule is compatible with the content type.
+     * Because this check is made when contribution is created, 
+     * the type of the parent content is not checked anymore in getChildren.
+     */
+    boolean isCompatible(Class<?> contentType);
+    
+    /**
+     * Given parent content produces child contents.
+     */
+    Collection<?> getChildren(ReadGraph graph, Object parent) throws DatabaseException;
+    
+    /**
+     * Given child content produces possible parent contents.
+     */
+    Collection<?> getParents(ReadGraph graph, Object child) throws DatabaseException;
+}