bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/variable/AbstractChildVariable.java

   1 package org.simantics.db.layer0.variable;
   2
   3 import java.util.Collection;
   4 import java.util.Collections;
   5 import java.util.Map;
   6 import java.util.Set;
   7
   8 import org.simantics.databoard.binding.Binding;
   9 import org.simantics.db.ReadGraph;
  10 import org.simantics.db.Resource;
  11 import org.simantics.db.WriteGraph;
  12 import org.simantics.db.common.uri.UnescapedChildMapOfResource;
  13 import org.simantics.db.exception.DatabaseException;
  14 import org.simantics.db.layer0.exception.MissingVariableValueException;
  15 import org.simantics.db.layer0.variable.RVI.RVIPart;
  16 import org.simantics.db.layer0.variable.RVI.StringRVIPart;
  17 import org.simantics.db.layer0.variable.Variables.Role;
  18
  19 public abstract class AbstractChildVariable extends AbstractVariable {
  20
  21         public AbstractChildVariable() {
  22                 this(null);
  23         }
  24
  25         public AbstractChildVariable(VariableNode node) {
  26                 super(node);
  27         }
  28
  29     @Override
  30     public Role getRole(ReadGraph graph) throws DatabaseException {
  31         return Role.CHILD;
  32     }
  33
  34     @Override
  35     public <T> T getValue(ReadGraph graph) throws DatabaseException {
  36         throw new MissingVariableValueException("No value in child variable.");
  37     }
  38
  39     @Override
  40     public <T> T getValue(ReadGraph graph, Binding binding) throws DatabaseException {
  41         throw new MissingVariableValueException("No value in child variable.");
  42     }
  43
  44     @Override
  45     public void setValue(WriteGraph graph, Object value, Binding binding)
  46             throws DatabaseException {
  47         throw new DatabaseException("Cannot write value to a child variable.");
  48     }
  49
  50
  51     @Override
  52     public Resource getRepresents(ReadGraph graph) throws DatabaseException {
  53         Variable parent = getParent(graph);
  54         if(!(parent instanceof AbstractChildVariable))
  55             return null;
  56         Resource parentRepresents =
  57             ((AbstractChildVariable)parent).getRepresentsForBrowsingChildResources(graph);
  58         if(parentRepresents == null)
  59             return null;
  60         Resource result = graph.syncRequest(new UnescapedChildMapOfResource(parentRepresents))
  61                 .get(getName(graph));
  62 //      System.err.println("getRepresents " + getURI(graph) + " -> parent " + parentRepresents + " " + this + " => " + result + " " + getName(graph));
  63         return result;
  64     }
  65
  66     public Resource getRepresentsForBrowsingChildResources(ReadGraph graph) throws DatabaseException {
  67         return getRepresents(graph);
  68     }
  69
  70     @Override
  71     public Variable getPossibleExtraProperty(ReadGraph graph, String name) throws DatabaseException {
  72         return null;
  73     }
  74
  75     @Override
  76     public void collectExtraProperties(ReadGraph graph, Map<String, Variable> properties) throws DatabaseException {
  77     }
  78
  79     @Override
  80     protected Variable getPossibleDomainProperty(ReadGraph graph, String name) throws DatabaseException {
  81         return null;
  82     }
  83
  84     @Override
  85     public Variable getPossibleChild(ReadGraph graph, String name) throws DatabaseException {
  86         return null;
  87     }
  88
  89     @Override
  90     public Map<String, Variable> collectDomainProperties(ReadGraph graph, Map<String, Variable> map) throws DatabaseException {
  91         return map;
  92     }
  93
  94     @Override
  95     public Collection<Variable> getChildren(ReadGraph graph) throws DatabaseException {
  96         return Collections.emptyList();
  97     }
  98
  99     @Override
 100     public RVIPart getRVIPart(ReadGraph graph) throws DatabaseException {
 101         return new StringRVIPart(Role.CHILD, getName(graph));
 102     }
 103
 104     @Override
 105     public Set<String> getClassifications(ReadGraph graph) throws DatabaseException {
 106         return Collections.emptySet();
 107     }
 108
 109 }