Neo4j Movie-Actor example

xholonWorkbook.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--Xholon Workbook http://www.primordion.com/Xholon/gwt/ MIT License, Copyright (C) Ken Webb, Sat Apr 26 2014 21:43:52 GMT-0400 (EDT)-->
<XholonWorkbook>

<Notes><![CDATA[
Xholon
------
Title: Neo4j Movie-Actor example
Description: 
Url: http://www.primordion.com/Xholon/gwt/
InternalName: 11286090
Keywords: 

My Notes
--------
This workbook explores a simple Neo4j[2] example, and various issues that it raises:
- how to represent this as a Xholon app using a XholonWorkbook in a gist
- what it looks like using the Xholon D3 Circle Pack GUI
- how to deal with the many-to-many relationships between actors and movies
  - Xholon currently doesn't handle arrays of ports with a fieldName other than "port"
- can I represent this as a Petri Net
  - but then I have to deal with the Petri Net arcs in the composite structure hierarchy
- how to represent node properties with arbitrary names (ex: year)
- how to deal with relationship properties
  - use a Xholon IPort
  - use an intermediate Role or MovieRole node
- how to show only the roleName for movie and actor nodes, with clsc and d3cp GUI ???
  - be able to set a default getName() template
  - this isn't necessary to do

I'm manually converting the Neo4j nodes, relationships and properties to Xholon XML format.
I want to be able to do this automatically for any Neo4j content.

Quick notes as I work through how to do this:
- convert Neo4j/Cypher ' to Xholon/XML "
  - with Xholon/XML it's better to use " because there may be an embedded XPath expression that requires '
- convert Neo4j/Cypher principle naming property to Xholon roleName
- for ports, I'll use the approach I use with state machines, where ports are specified in ClassDetails,
and each port specification includes an initial step to identify the source node

Graph Setup[1] using the Cypher[3] language:
    CREATE
    
    // Movie nodes
    (matrix1:Movie { id : '603', title : 'The Matrix', year : '1999-03-31' }),
    (matrix2:Movie { id : '604', title : 'The Matrix Reloaded', year : '2003-05-07' }),
    (matrix3:Movie { id : '605', title : 'The Matrix Revolutions', year : '2003-10-27' }),
    
    // Actor nodes
    (neo:Actor { name:'Keanu Reeves' }),
    (morpheus:Actor { name:'Laurence Fishburne' }),
    (trinity:Actor { name:'Carrie-Anne Moss' }),
    
    // relationships
    (matrix1)<-[:ACTS_IN { role : 'Neo' }]-(neo),
    (matrix2)<-[:ACTS_IN { role : 'Neo' }]-(neo),
    (matrix3)<-[:ACTS_IN { role : 'Neo' }]-(neo),
    (matrix1)<-[:ACTS_IN { role : 'Morpheus' }]-(morpheus),
    (matrix2)<-[:ACTS_IN { role : 'Morpheus' }]-(morpheus),
    (matrix3)<-[:ACTS_IN { role : 'Morpheus' }]-(morpheus),
    (matrix1)<-[:ACTS_IN { role : 'Trinity' }]-(trinity),
    (matrix2)<-[:ACTS_IN { role : 'Trinity' }]-(trinity),
    (matrix3)<-[:ACTS_IN { role : 'Trinity' }]-(trinity)

Query[1]:
    MATCH (a:Actor { name:"Keanu Reeves" })
    RETURN a

References
----------
(1) http://www.neo4j.org/console?id=cineasts
(2) http://www.neo4j.org/
(3) http://docs.neo4j.org/chunked/milestone/cypher-query-lang.html

]]></Notes> 

<_-.XholonClass>

  <!-- domain objects -->
  <MovieActorSystem/>
  <Movie/>
  <Actor/>
  
</_-.XholonClass>

<xholonClassDetails>
  <Actor xhType="XhtypePureActiveObject">
    <port name="port" index="0" connector=".[@roleName='Keanu Reeves']/../Movie[@roleName='The Matrix']"/>
    <port name="port" index="1" connector=".[@roleName='Keanu Reeves']/../Movie[@roleName='The Matrix Reloaded']"/>
    <port name="port" index="2" connector=".[@roleName='Keanu Reeves']/../Movie[@roleName='The Matrix Revolutions']"/>
    
    <port name="port" index="0" connector=".[@roleName='Laurence Fishburne']/../Movie[@roleName='The Matrix']"/>
    <port name="port" index="1" connector=".[@roleName='Laurence Fishburne']/../Movie[@roleName='The Matrix Reloaded']"/>
    <port name="port" index="2" connector=".[@roleName='Laurence Fishburne']/../Movie[@roleName='The Matrix Revolutions']"/>
    
    <port name="port" index="0" connector=".[@roleName='Carrie-Anne Moss']/../Movie[@roleName='The Matrix']"/>
    <port name="port" index="1" connector=".[@roleName='Carrie-Anne Moss']/../Movie[@roleName='The Matrix Reloaded']"/>
    <port name="port" index="2" connector=".[@roleName='Carrie-Anne Moss']/../Movie[@roleName='The Matrix Revolutions']"/>
  </Actor>
</xholonClassDetails>

<MovieActorSystem>
  <Movie roleName="The Matrix" year="1999-03-31"/>
  <Movie roleName="The Matrix Reloaded" year="2003-05-07"/>
  <Movie roleName="The Matrix Revolutions" year="2003-10-27"/>
  
  <Actor roleName="Keanu Reeves"/>
  <Actor roleName="Laurence Fishburne"/>
  <Actor roleName="Carrie-Anne Moss"/>
</MovieActorSystem>

<MovieActorSystembehavior implName="org.primordion.xholon.base.Behavior_gwtjs"><![CDATA[
  var beh = {
    postConfigure: function() {
      //$wnd.xh.param("MaxPorts", "3");
      this.writeCypher();
      this.cnode.remove();
    },
    
    // write out the Xholon app in a Neo4j Cypher format, similar to the original
    writeCypher: function() {
      var node = this.cnode.parent().first();
      var relationships = "";
      while (node) {
        if (node.xhc().name() == "Movie") {
          // (matrix1:Movie { id : '603', title : 'The Matrix', year : '1999-03-31' }),
          node.println("(node" + node.id() + ":Movie { title : '" + node.role() + "', year : '" + node.year + "' }),");
        }
        else if (node.xhc().name() == "Actor") {
          // (neo:Actor { name:'Keanu Reeves' }),
          node.println("(node" + node.id() + ":Actor { name : '" + node.role() + "' }),");
          // (matrix1)<-[:ACTS_IN { role : 'Neo' }]-(neo),
          var i = 0;
          var movie = node.port(i++);
          while (movie) {
            relationships = relationships + "(node" + movie.id() + ")<-[:ACTS_IN]-(node" + node.id() + "),\n";
            movie = node.port(i++);
          }
        }
        node = node.next();
      }
      this.cnode.parent().println(relationships);
    }
  }
]]></MovieActorSystembehavior>

<SvgClient><Attribute_String roleName="svgUri"><![CDATA[data:image/svg+xml,
<svg width="100" height="50" xmlns="http://www.w3.org/2000/svg">
  <g>
    <title>Movie</title>
    <rect id="MovieActorSystem/Movie" fill="#98FB98" height="50" width="50" x="25" y="0"/>
  </g>
</svg>
]]></Attribute_String><Attribute_String roleName="setup">${MODELNAME_DEFAULT},${SVGURI_DEFAULT}</Attribute_String></SvgClient>

</XholonWorkbook>