--- /dev/null
+package org.simantics.db.common;\r
+\r
+import java.util.HashSet;\r
+import java.util.Set;\r
+\r
+import org.simantics.databoard.adapter.AdaptException;\r
+import org.simantics.databoard.binding.Binding;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.graph.representation.TransferableGraph1;\r
+import org.simantics.graph.representation.TransferableGraphUtils;\r
+import org.simantics.graph.representation.Value;\r
+import org.simantics.layer0.Layer0;\r
+\r
+public class TransferableGraphRequests {\r
+ \r
+ private TransferableGraph1 tg;\r
+ private ReadGraph graph;\r
+ \r
+ public TransferableGraphRequests(TransferableGraph1 tg, ReadGraph graph) {\r
+ this.tg = tg;\r
+ this.graph = graph;\r
+ }\r
+\r
+ public Resource getExternal(int id) throws DatabaseException {\r
+ String uri = TransferableGraphUtils.getURI(tg, id);\r
+ return graph.getPossibleResource(uri);\r
+ }\r
+ \r
+ public Set<Integer> getObjects(int subject, Resource relation) throws DatabaseException {\r
+\r
+ Set<Integer> result = new HashSet<Integer>();\r
+ for(int i=0;i<tg.statements.length;i+=4) {\r
+ if(tg.statements[i] == subject) {\r
+ Resource predicate = getExternal(tg.statements[i+1]);\r
+ if(predicate != null)\r
+ if(graph.isSubrelationOf(predicate, relation)) result.add(tg.statements[i+3]); \r
+ }\r
+ }\r
+ return result;\r
+ \r
+ }\r
+\r
+ public Set<Integer> getSubjects(int object, Resource inverseRelation) throws DatabaseException {\r
+\r
+ Set<Integer> result = new HashSet<Integer>();\r
+ for(int i=0;i<tg.statements.length;i+=4) {\r
+ if(tg.statements[i+3] == object) {\r
+ Resource predicate = getExternal(tg.statements[i+2]);\r
+ if(predicate != null)\r
+ if(graph.isSubrelationOf(predicate, inverseRelation)) result.add(tg.statements[i]); \r
+ }\r
+ }\r
+ return result;\r
+ \r
+ }\r
+\r
+ public int getPossibleObject(int subject, Resource relation) throws DatabaseException {\r
+ Set<Integer> objects = getObjects(subject, relation);\r
+ if(objects.size() == 1) return objects.iterator().next();\r
+ return -1;\r
+ }\r
+\r
+ public int getSingleObject(int subject, Resource relation) throws DatabaseException {\r
+\r
+ Set<Integer> objects = getObjects(subject, relation);\r
+ if(objects.size() == 1) return objects.iterator().next();\r
+ else if (objects.size() == 0) throw new DatabaseException("No objects for subject " + subject + " and relation " + graph.getURI(relation));\r
+ else throw new DatabaseException("Multiple (" + objects.size() + ") objects for subject " + subject + " and relation " + graph.getURI(relation));\r
+ \r
+ }\r
+\r
+ public int getPossibleSubject(int object, Resource inverseRelation) throws DatabaseException {\r
+ Set<Integer> subjects = getSubjects(object, inverseRelation);\r
+ if(subjects.size() == 1) return subjects.iterator().next();\r
+ return -1;\r
+ }\r
+\r
+ public int getSingleSubject(int object, Resource inverseRelation) throws DatabaseException {\r
+\r
+ Set<Integer> subjects = getObjects(object, inverseRelation);\r
+ if(subjects.size() == 1) return subjects.iterator().next();\r
+ else if (subjects.size() == 0) throw new DatabaseException("No subjects for object " + object + " and relation " + graph.getURI(inverseRelation));\r
+ else throw new DatabaseException("Multiple (" + subjects.size() + ") subjects for object " + object + " and relation " + graph.getURI(inverseRelation));\r
+ \r
+ }\r
+\r
+ public <T> T getRelatedValue(int subject, Resource relation, Binding binding) throws DatabaseException {\r
+ \r
+ int object = getSingleObject(subject, relation);\r
+ return getValue(object, binding);\r
+ \r
+ }\r
+\r
+ public <T> T getPossibleRelatedValue(int subject, Resource relation, Binding binding) throws DatabaseException {\r
+ int object = getPossibleObject(subject, relation);\r
+ if (object == -1)\r
+ return null;\r
+ return getPossibleValue(object, binding);\r
+ }\r
+\r
+ @SuppressWarnings("unchecked")\r
+ public <T> T getValue(int subject, Binding binding) throws DatabaseException {\r
+\r
+ Value value = TransferableGraphUtils.findValue(tg, subject);\r
+ if(value == null) throw new DatabaseException("No value for subject " + subject);\r
+ try {\r
+ return (T)value.value.getValue(binding);\r
+ } catch (AdaptException e) {\r
+ throw new DatabaseException(e);\r
+ }\r
+ \r
+ }\r
+\r
+ @SuppressWarnings("unchecked")\r
+ public <T> T getPossibleValue(int subject, Binding binding) {\r
+ Value value = TransferableGraphUtils.findValue(tg, subject);\r
+ if(value == null) return null;\r
+ try {\r
+ return (T)value.value.getValue(binding);\r
+ } catch (AdaptException e) {\r
+ return null;\r
+ }\r
+ }\r
+\r
+ public boolean isInstanceOf(int subject, Resource type) throws DatabaseException {\r
+\r
+ Layer0 L0 = Layer0.getInstance(graph);\r
+ for(int t : getObjects(subject, L0.InstanceOf)) {\r
+ Resource tr = getExternal(t);\r
+ if(tr != null)\r
+ if(graph.isInheritedFrom(tr, type)) return true;\r
+ }\r
+ \r
+ return false;\r
+ \r
+ }\r
+ \r
+\r
+ public String formatResource(int r) throws DatabaseException {\r
+ \r
+ String result = "" + r;\r
+ String uri = TransferableGraphUtils.getURI(tg, r);\r
+ if(!uri.isEmpty()) result = uri;\r
+ \r
+ Value value = TransferableGraphUtils.findValue(tg, r);\r
+ if(value != null) result += " (value " + value.value + ")";\r
+ \r
+ return result;\r
+ \r
+ }\r
+ \r
+ public String listStatements() throws DatabaseException {\r
+ \r
+ StringBuilder b = new StringBuilder();\r
+ for(int i=0;i<tg.statements.length;i+=4) {\r
+ int subject = tg.statements[i];\r
+ int predicate = tg.statements[i+1];\r
+ int object = tg.statements[i+3];\r
+ b.append(formatResource(subject) + " " + formatResource(predicate) + " " + formatResource(object) + "\n");\r
+ }\r
+ return b.toString();\r
+ \r
+ }\r
+ \r
+ public ReadGraph getGraph() {\r
+ return graph;\r
+ }\r
+ \r
+}\r
Code Review / simantics / platform.git / blobdiff