Histograph Neo4j plugin

Unmanaged Extension for Neo4j v2.2.2. Uses Neo4j's Traversal Framework Java API to compute Histograph concepts, and their outgoing relations. These outgoing relations will make all concepts nice and hairy.

Installation

First, add the following line to neo4j-server.properties:

org.neo4j.server.thirdparty_jaxrs_classes=org.waag.histograph.plugins=/histograph

Afterwards, clone this repository:

git clone https://github.com/histograph/neo4j-plugin.git

Go to directory:

cd neo4j-plugin

And build the plugin using Maven:

mvn package

Then, copy JAR file to Neo4j's plugin directory!

(Or just run install.sh (currently only works under MacOS with Neo4j installed by Homebrew).)

Alternatively, you can directy dowload a compiled JAR from GitHub.

Ping

To test if plugin is properly installed and loaded by Neo4j, run:

curl http://localhost:7474/histograph/ping

The plugin should respond with:

pong

Usage

curl -s -X POST http://localhost:7474/histograph/expand \
  -H "Content-Type: application/json" \
  -d '{"equivalence":"hg:sameHgConcept", "hairs":["hg:liesIn"], "ids": ["urn:hg:geonames:2759794", "urn:hg:geonames:2753637", "urn:hg:geonames:2753639", "urn:hg:geonames:2753638", "urn:hg:geonames:2753640", "urn:hg:tgn:7264696", "urn:hg:tgn:term:1001511217", "urn:hg:geonames:2753636", "urn:hg:tgn:7264697", "urn:hg:tgn:7264700", "urn:hg:tgn:term:1001493884"]}' \
| python -mjson.tool | pygmentize -l js

The plugin exposes a single endpoint - /histograph/expand - and expects a POST request with a JSON body of the following form:

{
  "equivalence": "hg:sameHgConcept",
  "hairs": [
    "hg:liesIn"
  ],
  "ids": [
    "urn:hg:geonames:2759794",
    "urn:hg:geonames:2753637",
    "..."
  ]
}

Output

Example output of a single street in lovely Bussum. Response is an array of Histograph concepts, each concept contains an array of PITs:

[
  [
    {
      "hairs": [],
      "pit": {
        "data": {
          "gme_id": 381,
          "gme_naam": "Bussum",
          "wpsnaamnen": "BUSSUM",
          "wvk_ids": [
            278353046,
            278353106,
            278354021,
            278354047
          ]
        },
        "geometry": {
          "coordinates": [
            [
              [
                5.158458167008441,
                52.28061009371572
              ],
              [
                5.15888270877095,
                52.27956954753817
              ]
            ],
            [
              [
                5.15888270877095,
                52.27956954753817
              ],
              [
                5.159036946991636,
                52.2792532154488
              ]
            ],
            [
              [
                5.158210740054656,
                52.281287156905684
              ],
              [
                5.158145997725702,
                52.28147231411347
              ],
              [
                5.158130279481965,
                52.28167900202832
              ],
              [
                5.158144146936424,
                52.28183182070672
              ],
              [
                5.158172668630267,
                52.28198466775494
              ],
              [
                5.158267660671528,
                52.2821293477672
              ]
            ],
            [
              [
                5.158267660671528,
                52.2821293477672
              ],
              [
                5.158342184175749,
                52.28227628896101
              ],
              [
                5.158443925510478,
                52.28238823949631
              ],
              [
                5.158671010293007,
                52.28255945475333
              ],
              [
                5.158765053654402,
                52.28271820733365
              ]
            ]
          ],
          "type": "MultiLineString"
        },
        "id": "urn:hgid:nwb/bussum-albrechtlaan",
        "name": "Albrechtlaan",
        "type": "hg:Street"
      },
      "relations": []
    },
    {
      "hairs": [
        {
          "id": "urn:hgid:bag/1331",
          "name": "Bussum",
          "type": "hg:Place"
        }
      ],
      "pit": {
        "data": {
          "woonplaatscode": 1331,
          "woonplaatsnaam": "Bussum"
        },
        "id": "urn:hgid:bag/381300000100009",
        "name": "Albrechtlaan",
        "type": "hg:Street"
      },
      "relations": [
        {
          "to": "urn:hgid:bag/1331",
          "type": "hg:liesIn"
        },
        {
          "to": "urn:hgid:nwb/bussum-albrechtlaan",
          "type": "hg:sameHgConcept"
        }
      ]
    }
  ]
]

Copyright (C) 2015 Waag Society.