README

README for the yaml parser.

Change-Id: Id94ec7bf4ba27ccffb31765b279e1ba3b8b50cd1
Issue-ID: SDC-2094
Signed-off-by: Tomasz Golabek <tomasz.golabek@nokia.com>

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+## Library for parsing yaml files
+
+###### Requirements specified under the SDC jira ticket: [SDC-2094](https://jira.onap.org/browse/SDC-2094) - R4 5G U/C SDC: FM Meta Data GUI Display from PNF Onboarded Package
+
+#### GAB Controller
+
+##### Introduction
+GABController is a tool for searching inside the [Yaml](https://yaml.org/) file content. At this moment is completely independent from any ONAPs component and can be used in any case where searching full json-path format keywords is needed. To use it, two things are required from the user: yaml document and list of fields to filter the results and nothing more. 
+
+##### Usage
+GABController is provided as a standard JAVA archive and can be imported in any application by adding its JAR name into the classpath or using maven dependency management:
+```
+<dependency>
+        <groupId>org.onap.sdc.common</groupId>
+        <artifactId>onap-generic-artifact-browser-service</artifactId>
+        <version>${project.version}</version>
+        <scope>compile</scope>
+</dependency>
+```
+The most usable class is GABServiceImpl implements GABService and expose single method for searching paths inside the [Yaml](https://yaml.org/) file.
+
+GABService operates on 2 different types: GABQuery as an input and GABResults as an output model.
+###### Example 1 - searching for multiple keywords:
+```
+/* First You need to create GABService */
+GABService gabService = new GABServiceImpl();
+
+/* Next step is to prepare your query model.
+ *  In this example we will use file: 
+ *      '/root/test.yml' 
+ *  and will search for keywords: 
+ *      'event.structure.commonEventHeader' and 'event.presence' 
+ */
+GABQuery gabQuery = new GABQuery(Arrays.asList(
+  "event.structure.commonEventHeader","event.presence"), "/root/test.yml", GABQueryType.PATH);    
+
+/* And at last ask for the results */
+GABResults gabResults = gabService.searchFor(gabQuery); 
+
+/* And thats it. Please notice that IOException can be thrown in some cases.
+ * For more info please follow specification inside the JavaDocs. 
+ */    
+``` 
+
+##### Dependencies
+
+###### Runtime:
+- lombok: 1.16.16 - [Doc](https://projectlombok.org/features/all)
+- snakeyaml: 1.21 - [Doc](https://bitbucket.org/asomov/snakeyaml)
+- gson: 2.8.5 - [Doc](https://github.com/google/gson)
+- jsurfer: 1.4.3 - [Doc](https://github.com/jsurfer/JsonSurfer)
+- guava: 18.0 - [Doc](https://github.com/google/guava/wiki/Release18)
+- commons-io: 2.6 - [Doc](https://commons.apache.org/proper/commons-io/)
+
+###### Testing:    
+- junit: 5.4.0 - [Doc](https://junit.org/junit5/docs/current/api/)
+
+#### Tests structure
+Generic Artifact Browser has got two independent layers of tests:
+1. Unit testing using JUnit 5 (integrated in every component)
+2. Component testing using Cucumber 2.3 (component-tests module) 
+
+All layers are currently executed during the maven build of the main project.
+
+##### Dependencies
+
+###### Util:
+- guava: 18.0 - [Doc](https://github.com/google/guava/wiki/Release18)
+
+###### Testing:    
+- junit: 5.4.0 - [Doc](https://junit.org/junit5/docs/current/api/)
+- cucumber: 2.3.1 - [Doc](https://docs.cucumber.io/)
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