scilab/modules/xcos/src/java/org/scilab/modules/xcos/io/sax/LinkHandler.java

   1 /*
   2  * Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
   3  * Copyright (C) 2015-2015 - Scilab Enterprises - Clement DAVID
   4  *
   5  * This file must be used under the terms of the CeCILL.
   6  * This source file is licensed as described in the file COPYING, which
   7  * you should have received as part of this distribution.  The terms
   8  * are also available at
   9  * http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
  10  *
  11  */
  12
  13 package org.scilab.modules.xcos.io.sax;
  14
  15 import java.util.ArrayList;
  16
  17 import org.scilab.modules.xcos.Kind;
  18 import org.scilab.modules.xcos.ObjectProperties;
  19 import org.scilab.modules.xcos.graph.model.ScicosObjectOwner;
  20 import org.scilab.modules.xcos.io.HandledElement;
  21 import org.scilab.modules.xcos.io.sax.XcosSAXHandler.UnresolvedReference;
  22 import org.scilab.modules.xcos.link.BasicLink;
  23 import org.scilab.modules.xcos.link.CommandControlLink;
  24 import org.scilab.modules.xcos.link.ExplicitLink;
  25 import org.scilab.modules.xcos.link.ImplicitLink;
  26 import org.xml.sax.Attributes;
  27 import org.xml.sax.SAXParseException;
  28
  29 class LinkHandler implements ScilabHandler {
  30
  31     private final XcosSAXHandler saxHandler;
  32
  33     /**
  34      * Default constructor
  35      *
  36      * @param saxHandler
  37      *            the shared sax handler
  38      */
  39     LinkHandler(XcosSAXHandler saxHandler) {
  40         this.saxHandler = saxHandler;
  41     }
  42
  43     @Override
  44     public BasicLink startElement(HandledElement found, Attributes atts) {
  45         String v;
  46         BasicLink link;
  47         int linkKind;
  48         final long uid = saxHandler.controller.createObject(Kind.LINK);
  49
  50         switch (found) {
  51             case CommandControlLink:
  52                 link = new CommandControlLink(uid);
  53                 linkKind = -1;
  54                 break;
  55             case ExplicitLink:
  56                 link = new ExplicitLink(uid);
  57                 linkKind = 1;
  58                 break;
  59             case ImplicitLink:
  60                 link = new ImplicitLink(uid);
  61                 linkKind = 2;
  62                 break;
  63             default:
  64                 throw new IllegalArgumentException();
  65         }
  66
  67         /*
  68          * Set the attributes
  69          */
  70         v = atts.getValue("id");
  71         if (v != null) {
  72             link.setId(v);
  73             saxHandler.allChildren.peek().put(v, uid);
  74         }
  75
  76         saxHandler.controller.setObjectProperty(uid, Kind.LINK, ObjectProperties.KIND, linkKind);
  77
  78         v = atts.getValue("source");
  79         if (v != null) {
  80             Long src = saxHandler.allChildren.peek().get(v);
  81             if (src != null) {
  82                 // if the attribute is present then the connected port is already
  83                 // decoded and present in the map
  84                 saxHandler.controller.setObjectProperty(uid, Kind.LINK, ObjectProperties.SOURCE_PORT, src.longValue());
  85                 saxHandler.controller.setObjectProperty(src.longValue(), Kind.PORT, ObjectProperties.CONNECTED_SIGNALS, uid);
  86             } else {
  87                 // if not present then it will be resolved later
  88                 ArrayList<UnresolvedReference> refList = saxHandler.unresolvedReferences.get(v);
  89                 if (refList == null) {
  90                     refList = new ArrayList<>();
  91                     saxHandler.unresolvedReferences.put(v, refList);
  92                 }
  93                 refList.add(new UnresolvedReference(new ScicosObjectOwner(uid, Kind.LINK), ObjectProperties.SOURCE_PORT, ObjectProperties.CONNECTED_SIGNALS, 0));
  94             }
  95         }
  96
  97         v = atts.getValue("target");
  98         if (v != null) {
  99             Long dst = saxHandler.allChildren.peek().get(v);
 100             if (dst != null) {
 101                 // if the attribute is present then the connected port is already
 102                 // decoded and present in the map
 103                 saxHandler.controller.setObjectProperty(uid, Kind.LINK, ObjectProperties.DESTINATION_PORT, dst.longValue());
 104                 saxHandler.controller.setObjectProperty(dst.longValue(), Kind.PORT, ObjectProperties.CONNECTED_SIGNALS, uid);
 105             } else {
 106                 // if not present then it will be resolved later
 107                 ArrayList<UnresolvedReference> refList = saxHandler.unresolvedReferences.get(v);
 108                 if (refList == null) {
 109                     refList = new ArrayList<>();
 110                     saxHandler.unresolvedReferences.put(v, refList);
 111                 }
 112                 refList.add(new UnresolvedReference(new ScicosObjectOwner(uid, Kind.LINK), ObjectProperties.DESTINATION_PORT, ObjectProperties.CONNECTED_SIGNALS, 0));
 113             }
 114         }
 115
 116         v = atts.getValue("style");
 117         if (v != null) {
 118             saxHandler.controller.setObjectProperty(uid, Kind.LINK, ObjectProperties.STYLE, v);
 119         }
 120
 121         v = atts.getValue("value");
 122         if (v != null) {
 123             saxHandler.controller.setObjectProperty(uid, Kind.LINK, ObjectProperties.LABEL, v);
 124         }
 125
 126         saxHandler.insertChild(link);
 127         return link;
 128     }
 129
 130     @Override
 131     public void endElement(HandledElement found) {
 132     }
 133 }