bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/util/ExtendedUris.java

   1 package org.simantics.db.layer0.util;
   2
   3 import java.util.Collection;
   4
   5 import org.simantics.databoard.util.URIStringUtils;
   6 import org.simantics.db.ReadGraph;
   7 import org.simantics.db.Resource;
   8 import org.simantics.db.Statement;
   9 import org.simantics.db.common.request.FunctionalStatementMapOfResource;
  10 import org.simantics.db.common.uri.UnescapedChildMapOfResource;
  11 import org.simantics.db.exception.DatabaseException;
  12 import org.simantics.layer0.Layer0;
  13 import org.simantics.scl.runtime.tuple.Tuple2;
  14
  15 public class ExtendedUris {
  16
  17     public static Resource resolveAbsoluteUri(ReadGraph graph, String uri) throws DatabaseException {
  18         if(!uri.startsWith("http:/"))
  19             throw new IllegalArgumentException("Invalid absolute URI '" + uri + "'.");
  20         return resolveRelativeUri(graph, graph.getRootLibrary(), uri.substring(6));
  21     }
  22
  23     public static Resource resolveRelativeUri(ReadGraph graph, Resource parent, String uri) throws DatabaseException {
  24         int beginPos = 0;
  25         while(beginPos < uri.length()) {
  26             int endPos;
  27             for(endPos = beginPos+1; endPos < uri.length(); ++endPos) {
  28                 char c = uri.charAt(endPos);
  29                 if(c == '/' || c == '#')
  30                     break;
  31             }
  32
  33             char c = uri.charAt(beginPos);
  34             if(c == '/') {
  35                 String escapedName = uri.substring(beginPos+1, endPos);
  36                 String name = URIStringUtils.unescape(escapedName);
  37                 parent = graph.syncRequest(new UnescapedChildMapOfResource(parent)).get(name);
  38                 if(parent == null)
  39                     throw new DatabaseException("Didn't find a child " + name + " for " + uri.substring(0, beginPos));
  40             }
  41             else if(c == '#') {
  42                 String escapedName = uri.substring(beginPos+1, endPos);
  43                 String name = URIStringUtils.unescape(escapedName);
  44                 parent = graph.syncRequest(new FunctionalStatementMapOfResource(parent)).get(name);
  45                 if(parent == null)
  46                     throw new DatabaseException("Didn't find a property " + name);
  47             }
  48             else
  49                 throw new IllegalArgumentException("Invalid relative URI '" + uri + "'.");
  50             beginPos = endPos;
  51         }
  52         return parent;
  53     }
  54
  55     private static boolean initialized = false;
  56     private static Resource ElementToComponent;
  57     private static void initialize(ReadGraph graph) throws DatabaseException {
  58         ElementToComponent = graph.getResource("http://www.simantics.org/Modeling-1.2/ElementToComponent");
  59         initialized = true;
  60     }
  61
  62     public static Tuple2 getPrimaryFunctionalReference(ReadGraph graph, Resource r) throws DatabaseException {
  63         if(!initialized)
  64             initialize(graph);
  65         Statement stat = graph.getPossibleStatement(r, ElementToComponent);
  66         if(stat != null)
  67             return statementToResult(graph, stat);
  68         return null;
  69     }
  70
  71     public static Tuple2 getSecondaryFunctionalReference(ReadGraph graph, Resource r) throws DatabaseException {
  72         Layer0 L0 = Layer0.getInstance(graph);
  73         Collection<Statement> statements = graph.getStatements(r, L0.PropertyOf);
  74         if(statements.size() == 1)
  75             for(Statement stat : statements)
  76                 return statementToResult(graph, stat);
  77         return null;
  78     }
  79
  80     private static Tuple2 statementToResult(ReadGraph graph, Statement stat) throws DatabaseException {
  81         return new Tuple2(stat.getObject(), graph.getInverse(stat.getPredicate()));
  82     }
  83
  84 }