X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.db.layer0%2Fsrc%2Forg%2Fsimantics%2Fdb%2Flayer0%2Futil%2FGraphAccessorUtils.java;fp=bundles%2Forg.simantics.db.layer0%2Fsrc%2Forg%2Fsimantics%2Fdb%2Flayer0%2Futil%2FGraphAccessorUtils.java;h=54cedf088edbfdf0c963ad27c73aaaa5f345c5b3;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/util/GraphAccessorUtils.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/util/GraphAccessorUtils.java
new file mode 100644
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+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/util/GraphAccessorUtils.java
@@ -0,0 +1,220 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 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.db.layer0.util;
+
+import java.util.Collection;
+
+import org.simantics.databoard.Accessors;
+import org.simantics.databoard.accessor.Accessor;
+import org.simantics.databoard.accessor.error.AccessorConstructionException;
+import org.simantics.databoard.accessor.error.AccessorException;
+import org.simantics.databoard.accessor.event.Event;
+import org.simantics.databoard.accessor.interestset.InterestSet;
+import org.simantics.databoard.binding.Binding;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.RequestProcessor;
+import org.simantics.db.Resource;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.common.request.WriteRequest;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.procedure.Listener;
+import org.simantics.db.request.Read;
+
+public class GraphAccessorUtils {
+
+	static private class ValueReadRequest implements Read<Object> {
+		Resource resource;
+		Binding binding;
+		
+		public ValueReadRequest(Resource resource, Binding binding) {
+			this.resource = resource;
+			this.binding = binding;
+		}
+
+		@Override
+		public Object perform(ReadGraph graph) throws DatabaseException {
+			return graph.getValue(resource, binding);
+		}
+	}
+	
+
+	static private class ValueReadRequest2 implements Read<Object> {
+		Resource resource;
+		Resource relation;
+		Object defaultValue;
+		Binding binding;
+		
+		public ValueReadRequest2(Resource resource, Resource relation, Object defaultValue, Binding binding) {
+			this.resource = resource;
+			this.relation = relation;
+			this.defaultValue = defaultValue;
+			this.binding = binding;
+		}
+
+		@Override
+		public Object perform(ReadGraph graph) throws DatabaseException {
+			Object value = graph.getPossibleRelatedValue(resource, relation, binding);
+			if(value != null)
+				return value;
+			else
+				return defaultValue;
+		}
+	}
+		
+	static private class ValueReadListener implements Listener<Object> {
+
+		Binding binding;
+		Accessor accessor;		
+		
+		public ValueReadListener(Binding binding) {
+			this.binding = binding;
+		}
+
+		@Override
+		public void exception(Throwable t) {
+		}
+
+		@Override
+		public void execute(Object result) {
+			if(accessor == null)
+				try {
+					accessor = Accessors.getAccessor(binding, result);					
+				} catch (AccessorConstructionException e) {
+					e.printStackTrace();
+				}
+			else
+				try {
+					if(!binding.equals(accessor.getValue(binding), result))
+						accessor.setValue(binding, result);
+				} catch (AccessorException e) {
+					e.printStackTrace();
+				}			
+		}
+
+		@Override
+		public boolean isDisposed() {
+			// TODO Auto-generated method stub
+			return false;
+		}
+		
+	}
+	
+	static private class AccessorListener implements Accessor.Listener {
+
+		Accessor accessor;
+		RequestProcessor rp;
+		Resource resource;
+		Binding binding;
+		
+		public AccessorListener(Accessor accessor, RequestProcessor rp,
+				Resource resource, Binding binding) {
+			this.accessor = accessor;
+			this.rp = rp;
+			this.resource = resource;
+			this.binding = binding;
+		}
+
+		@Override
+		public void onEvents(Collection<Event> event) {
+			rp.asyncRequest(new WriteRequest() {				
+				@Override
+				public void perform(WriteGraph graph) throws DatabaseException {
+					try {
+						Object a = accessor.getValue(binding);
+						Object b = graph.getValue(resource, binding);
+						if(!binding.equals(a, b))
+							graph.claimValue(resource, a, binding);
+					} catch (AccessorException e) {
+						throw new DatabaseException(e);
+					}
+				}
+			});
+		}
+		
+	}
+	
+	static private class AccessorListener2 implements Accessor.Listener {
+
+		Accessor accessor;
+		RequestProcessor rp;
+		Resource resource;
+		Resource relation;
+		Binding binding;
+		
+		public AccessorListener2(Accessor accessor, RequestProcessor rp,
+				Resource resource, Resource relation, Binding binding) {
+			this.accessor = accessor;
+			this.rp = rp;
+			this.resource = resource;
+			this.relation = relation;
+			this.binding = binding;
+		}
+
+		@Override
+		public void onEvents(Collection<Event> event) {
+			rp.asyncRequest(new WriteRequest() {				
+				@Override
+				public void perform(WriteGraph graph) throws DatabaseException {
+					try {
+						Object a = accessor.getValue(binding);
+						
+						Resource valueResource = graph.getPossibleObject(resource, relation);
+						if(valueResource == null) {
+							valueResource = graph.newResource(); 
+							graph.claim(resource, relation, valueResource);
+							graph.claimValue(valueResource, a, binding);
+						}
+						else {
+							Object b = graph.getValue(valueResource, binding);
+							if(!binding.equals(a, b))
+								graph.claimLiteral(resource, relation, a, binding);
+						}
+					} catch (AccessorException e) {
+						throw new DatabaseException(e);
+					}
+				}
+			});
+		}
+		
+	}
+	
+	public static Accessor create(RequestProcessor rp, Resource resource, Binding binding) throws DatabaseException {
+		ValueReadRequest request = new ValueReadRequest(resource, binding);
+		ValueReadListener listener = new ValueReadListener(binding);
+		rp.syncRequest(request, listener);
+		try {
+			listener.accessor.addListener(
+				new AccessorListener(listener.accessor, rp, resource, binding), 
+				InterestSet.newInterestSet(listener.accessor.type(), true, false, true),
+				null, null);
+		} catch (AccessorException e) {
+			e.printStackTrace();
+		}
+		return listener.accessor;		
+	}
+	
+	public static Accessor create(RequestProcessor rp, Resource resource, Resource relation, Object defaultValue, Binding binding) throws DatabaseException {
+		ValueReadRequest2 request = new ValueReadRequest2(resource, relation, defaultValue, binding);
+		ValueReadListener listener = new ValueReadListener(binding);
+		rp.syncRequest(request, listener);
+		try {
+			listener.accessor.addListener(
+				new AccessorListener2(listener.accessor, rp, resource, relation, binding), 
+				InterestSet.newInterestSet(listener.accessor.type(), true, false, true),
+				null, null);
+		} catch (AccessorException e) {
+			e.printStackTrace();
+		}
+		return listener.accessor;		
+	}
+	
+}