gerrit.simantics Code Review - simantics/platform.git/blob

   1 /*******************************************************************************
   2  * Copyright (c) 2010, 2011 Association for Decentralized Information Management in
   3  * Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.browsing.ui.model.children;
  13
  14 import java.util.ArrayList;
  15 import java.util.Collection;
  16 import java.util.Collections;
  17
  18 import org.simantics.browsing.ui.BuiltinKeys;
  19 import org.simantics.browsing.ui.NodeContext;
  20 import org.simantics.browsing.ui.model.InvalidContribution;
  21 import org.simantics.browsing.ui.model.nodetypes.NodeType;
  22 import org.simantics.databoard.Bindings;
  23 import org.simantics.db.ReadGraph;
  24 import org.simantics.db.Resource;
  25 import org.simantics.db.common.utils.NameUtils;
  26 import org.simantics.db.exception.DatabaseException;
  27 import org.simantics.db.layer0.exception.PendingVariableException;
  28 import org.simantics.viewpoint.ontology.ViewpointResource;
  29
  30 /**
  31  * A child contribution adds child nodes to the instances of a specific node type.
  32  * @author Hannu Niemistö
  33  */
  34 public class ChildContribution {
  35
  36         double priority;
  37         String identifier;
  38     NodeType parentNodeType;
  39     NodeType childNodeType;
  40     ChildRule childRule;
  41
  42     public ChildContribution(String identifier, double priority, NodeType parentNodeType, NodeType childNodeType,
  43             ChildRule childRule) throws InvalidContribution {
  44         if(!childRule.isCompatible(
  45                 parentNodeType.getContentType()
  46                 ))
  47             throw new InvalidContribution("Child rule is not compatible with the parent content type.");
  48         this.parentNodeType = parentNodeType;
  49         this.childNodeType = childNodeType;
  50         this.childRule = childRule;
  51         this.identifier = identifier;
  52         this.priority = priority;
  53     }
  54
  55     public static ChildContribution create(ReadGraph g, Resource childContributionResource) throws DatabaseException, InvalidContribution {
  56         ViewpointResource vr = ViewpointResource.getInstance(g);
  57
  58         Resource parentNodeTypeResource = g.getSingleObject(childContributionResource, vr.ChildContribution_HasParentNodeType);
  59         NodeType parentNodeType = g.adapt(parentNodeTypeResource, NodeType.class);
  60
  61         Resource childNodeTypeResource = g.getSingleObject(childContributionResource, vr.ChildContribution_HasChildNodeType);
  62         NodeType childNodeType = g.adapt(childNodeTypeResource, NodeType.class);
  63
  64         Resource childRuleResource = g.getSingleObject(childContributionResource, vr.ChildContribution_HasRule);
  65         ChildRule childRule = g.adapt(childRuleResource, ChildRule.class);
  66
  67         String identifier = g.getPossibleRelatedValue(childContributionResource, vr.ChildContribution_identifier, Bindings.STRING);
  68         if(identifier == null) identifier = "";
  69         if("".equals(identifier)) {
  70                 identifier = g.getPossibleURI(childContributionResource);
  71             if(identifier == null) identifier = NameUtils.getSafeName(g, childContributionResource, true);
  72         }
  73
  74         Double priority = g.getPossibleRelatedValue(childContributionResource, vr.ChildContribution_priority, Bindings.DOUBLE);
  75         if(priority == null) priority = 0.0;
  76
  77         return new ChildContribution(identifier, priority, parentNodeType, childNodeType, childRule);
  78
  79     }
  80
  81     public NodeType getParentNodeType() {
  82         return parentNodeType;
  83     }
  84
  85     public NodeType getChildNodeType() {
  86         return childNodeType;
  87     }
  88
  89     public String getIdentifier() {
  90         return identifier;
  91     }
  92
  93     public double getPriority() {
  94         return priority;
  95     }
  96
  97     /**
  98      * Given a parent node context returns a child node contexts contributed by
  99      * this contribution.
 100      */
 101     public Collection<NodeContext> getChildren(ReadGraph graph, NodeContext parent) {
 102         try {
 103             Object parentContent = parent.getConstant(BuiltinKeys.INPUT);
 104             Collection<?> childContents = childRule.getChildren(graph, parentContent);
 105             if(childContents.isEmpty())
 106                 return Collections.emptyList();
 107             ArrayList<NodeContext> children = new ArrayList<NodeContext>(childContents.size());
 108             for(Object childContent : childContents) {
 109                 NodeContext child = childNodeType.createNodeContext(graph, childContent);
 110                 if(child != null)
 111                     children.add(child);
 112             }
 113             return children;
 114         } catch(PendingVariableException e) {
 115             return Collections.emptyList();
 116         } catch(DatabaseException e) {
 117             e.printStackTrace();
 118             // TODO return some kind of error node
 119             return Collections.emptyList();
 120         }
 121     }
 122
 123     /**
 124      * Given a child node context returns a collection of possible parent node contexts.
 125      */
 126     public Collection<NodeContext> getParents(ReadGraph graph, NodeContext child) {
 127         try {
 128             Object childContent = child.getConstant(BuiltinKeys.INPUT);
 129             Collection<?> parentContents = childRule.getParents(graph, childContent);
 130             if(parentContents.isEmpty())
 131                 return Collections.emptyList();
 132             ArrayList<NodeContext> parents = new ArrayList<NodeContext>(parentContents.size());
 133             for(Object parentContent : parentContents) {
 134                 NodeContext parent = parentNodeType.createNodeContext(graph, parentContent);
 135                 if(parent != null)
 136                     parents.add(parent);
 137             }
 138             return parents;
 139         } catch(DatabaseException e) {
 140             e.printStackTrace();
 141             return Collections.emptyList();
 142         }
 143     }
 144
 145     public boolean hasChildren(ReadGraph graph, NodeContext parent) {
 146         try {
 147             Object parentContent = parent.getConstant(BuiltinKeys.INPUT);
 148             Collection<?> childContents = childRule.getChildren(graph, parentContent);
 149             if(childContents.isEmpty())
 150                 return false;
 151             for(Object childContent : childContents) {
 152                 NodeContext child = childNodeType.createNodeContext(graph, childContent);
 153                 if(child != null)
 154                     return true;
 155             }
 156         } catch(DatabaseException e) {
 157             e.printStackTrace();
 158         }
 159         return false;
 160     }
 161
 162     @Override
 163     public String toString() {
 164         return identifier;
 165     }
 166
 167 }