Simple path implementation for JSON data extraction

[lemnik]

Goal

Enable the next phase of our remote SDK configuration with a simple data extractor.

Design

The new JsonCollectionPath class implements the parsing of the path into nodes, and encapsulates the data extraction.

Calling JsonCollectionPath.fromString splits the string on the dot ('.') character and then builds a chain of PathNode objects based on each unit of the path:

• '*' becomes a WildcardNode and matches all elements in an array, and all values in an object
• Positive integers become PositiveIndex objects and attempt to match the numbered element of an array. If asked to match against an object (Map) the index is treated as a property name
• Negative integers become NegativeIndex objects and attempt to match an element from the end of an array (-1 is the last element, -2 is the second-from-last, and so-on). If asked to match against an object (Map) the index is treated as a property name (verbatim)
• All other strings are treated as a property name for a JSON object (Map) and will not match anything else.

Testing

New unit tests introduced.

[bugsnagbot]

Android notifier sizes

Format	Size impact of Bugsnag (kB)	Size impact of Bugsnag when Minified (kB)
APK	1837.34	1602.98
arm64_v8a	647.43	409.86
armeabi_v7a	590.09	352.52
x86	717.04	483.57
x86_64	692.47	454.9

Generated by 🚫 Danger

[yousif-bugsnag]

LGTM