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YANG Tools is a infrastructure project aiming to develop necessary toolingtool chain and libraries providing support of NETCONF and YANG for Java(JVM-language based) projects and applications.

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In ONOS, YANG is being used as a general purpose modeling language.

There are four entities which drive this:

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Base Models will be used by different YANG components. It includes following:

DataNode: Provides a basis for holding information in a tree whose structure corresponds to a set of YANG models (base & augmentations).

• Is immutable.
• Provides a mechanism for mutation (Builder pattern, etc.)
• Understands the schema that was used to construct it.
• Store will be based on DataNode.
  

      Data node is categorized in two sub-type:

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Various components of YANG compiler which helps yang compiler to compiles YANG files and generates the required code with serialized metadata.

Parser

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Parse the input YANG file and produces DataModel. It compiles Yang files against the YANG grammar version 1.0 using ANTLR tool and updates the data model tree.

DataModel

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Abstract representation of YANG in JAVA tree format, it is later serialized and used by YANG runtime to understand the schema information.

Linker

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Links the various Intra File/Inter-File/ Inter-JAR YANG constructs dependencies. For ex: grouping and uses linking, typedef and type linking. Import, imclude depencency.

Translator

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Generates java code corresponding to Data model.

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