Origo Config Layer Extractor

Summary

Extracts detailed layer information from an Origo-map configuration JSON file. This transformer is specifically designed to handle Origo's non-standard JSON format, which may include single-line (//) and multi-line (/* ... */) comments, before parsing the layer definitions.

GitHub

https://github.com/origo-map

Detailed Description

Origo map configurations are stored in JSON files that define groups, layers, sources, styles, and more. This transformer simplifies the process of reading these configurations by targeting the layer definitions directly.

A key feature of this transformer is its ability to parse JSON files containing comments. Standard JSON parsers will fail on files with // or /* ... */ comments, a common practice in Origo configurations. This transformer pre-processes the file to strip out comments, ensuring robust and error-free parsing.

It iterates through all layers defined in the configuration and outputs a separate feature for each one, with attributes containing key details like layer name, title, abstract, source URL, style, and a list of its attributes.

Input Ports

Port

Description

INPUT

Receives URL- or filepath to trigger the reading and processing of the Origo config file.

Output Ports

Port

Description

LAYER

Outputs one feature for each layer found in the configuration file. Each feature will have attributes containing the extracted layer details.

JSON

Outputs a single feature containing the original and the cleaned (comment-free) JSON content.

REJECTED

Outputs the original input feature if the specified JSON file cannot be found, is malformed (beyond comment handling).

Output Attributes

LAYER Port Attributes

Each feature exiting the LAYER port will have the following attributes populated from the config file:

Attribute

Description

layerName

The unique identifier or name of the layer (e.g., my_wms_layer).

layerTitle

The human-readable title for the layer (e.g., My Awesome WMS Layer).

layerAbstract

The descriptive text or abstract for the layer.

layerSource

The name of the source this layer is connected to.

sourceUrl

The full URL for the layer's data source (e.g., WMS/WFS GetMap/GetFeature URL).

layerAttributes

A list attribute containing the configured attributes (infoclick attributes) for the layer. This includes elements like layerAttributes{}.name and layerAttributes{}.title.

layerStyle

The name of the style applied to the layer.

...and more

Additional attributes such as projection, type, queryable, visible, etc., may be exposed depending on what is defined for the layer in the configuration file.

JSON Port Attributes

The feature exiting the JSON port will have the following attributes:

Attribute

Description

originalConfigJson

The raw, unmodified content of the Origo configuration file, including all original comments.

cleanedConfigJson

The JSON content of the configuration file after all single-line (//) and multi-line (/* ... */) comments have been removed.