Initial TCA commit into DCAEGEN2

Change-Id: I5f7f8af2a00419854cafc34b79277df60d1af095
Issue-ID: DCAEGEN2-53
Signed-off-by: an4828 <nekrassov@att.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/dcae-analytics-cdap-plugins/docs/JsonPathFilter-transform.md b/dcae-analytics-cdap-plugins/docs/JsonPathFilter-transform.md
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+# JSON Path Filter
+
+## Description
+
+Filters incoming JSON based on given filter mappings.
+
+The mappings in the plugin will be:
+
+    +================================================+
+    |   JSON Path Expression    |   Expected Values  |
+    |---------------------------|--------------------|
+    |$.employee.name.first      |    rajiv;manjesh   |
+    |$.employee.name.last       |   singla;gowda     |
+    |$.employee.email           |   johndoe@xyz.com  |
+    +================================================+
+    
+The above filter mappings will inside json path $.employee.name.first and check if value matches rajiv or manjesh. 
+Only if path does exist and matches any of the expected values rajiv or manjesh then first filter mapping will be true.
+
+If multiple mappings are provided all mapping must be true for result to be matched.
+
+If incoming json is null or empty then output result will be null as no matching is possible.
+
+### Expression
+
+The "root member object" for parsing any JSON is referred to as ```$```, regardless of
+whether it's an array or an object. It also uses either dot notation or bracket notation for
+defining the levels of parsing. For example: ```$.employee.name``` or ```$[employee][name]```.
+
+#### Supported Operators
+
+These operators are supported:
+
+    +========================================================================+
+    | Operator          | Description                                        |
+    |-------------------|----------------------------------------------------|
+    | $                 | The root element of the query                      |
+    | *                 | Wildcard                                           |
+    | ..                | Deep scan                                          |
+    | .<name>           | Dot notation representing child                    |
+    | [?(<expression>)] | Filter expression, should be boolean result always |
+    +========================================================================+