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ojai-generics\n\n[![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.github.anicolaspp/ojai-scala-generics_2.11/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.github.anicolaspp/ojai-scala-generics_2.11)\n\nThin, generic, scala idiomatic layer on top of MapR OJAI\n\n`ojai-generics` presents a very thin layer on top of OJAI that easies working with OJAI from Scala by adding idiomatic \nScala constructs. \n\n## QueryConditions Add-Ons\n\nThe OJAI API is written in Java and functions around `QueryCondition` use method overriding for different data types. In other words, \nin order to build a query, we need to know the exact type we are using at compile time, and while this seems like a good idea,\nit is far from convient in most occations.\n\nLet's look at some examples to show our case.\n\n## Using `ojai-generics`\n\nWe can use `ojai-generics` to reduce the boilerplate code we are forced to write when using OJAI Java like API by using \ngenerics and idiomatic Scala.\n\nLet's build an example from scratch so show in more details the advantages of using `ojai-generics`.\n\nSuppose we want to create a `QueryCondition` for a value coming from a Spark DataFrame, normally coming as `Any`.\n\n```scala\n\ndef buildEqualToCondition(field: String, value: Any)(implicit connection: Connection): QueryCondition = any match {\n  case _: Int    =\u003e connection.newCondition().is(field, Op.EQUAL, value.asInstanceOf[Int]).build()\n  case _: Double =\u003e connection.newCondition().is(field, Op.EQUAL, value.asInstanceOf[Double]).build()\n  ....\n}\n\ndef buildLessThanCondition(field: String, value: Any)(implicit connection: Connection): QueryCondition = any match {\n  case _: Int    =\u003e connection.newCondition().is(field, Op.LESS_THAN, value.asInstanceOf[Int]).build()\n  case _: Double =\u003e connection.newCondition().is(field, Op.LESS_THAN, value.asInstanceOf[Double]).build()\n  ....\n}\n```\n\nThat really is a problem if we have many types and many operations, since the same we are doing for all types have to be done \nfor all operations we have. \n\nUsing `ojai-generics` we can do this as follow.\n\n```scala\n\ndef buildEqualToCondition(field: String, value: Any)(implicit connection: Connection): QueryCondition = \n  connection.newCondition().field(field) === value\n  \ndef buildLessThanCondition(field: String, value: Any)(implicit connection: Connection): QueryCondition =\n  connection.newCondition().field(field) \u003c value\n\n```\n\nNotice that we have reduced the priously shown code by removing the pattern matching on the type. That means, we are using a\ngeneric API that is able to accept all possible types. Also, `ojai-genercis` takes care of the castings and convertions for us. In addition, it adds operators so we can think about these operations in a very natural way. \n\nIf we prefer a more Java like API, we can still do the following without loosing type safty and generics. \n\n```scala\ndef buildEqualToCondition(field: String, value: Any)(implicit connection: Connection): QueryCondition = \n  connection.newCondition().equalTo(field, value)\n  \ndef buildLessThanCondition(field: String, value: Any)(implicit connection: Connection): QueryCondition =\n  connection.newCondition().lessThan(field, value)\n```\n\nThese options are aliases that produce the same results as before just using a more verbose API. \n\n## Linking\n\n### Maven\n\n```xml\n\u003cdependency\u003e\n  \u003cgroupId\u003ecom.github.anicolaspp\u003c/groupId\u003e\n  \u003cartifactId\u003eojai-scala-generics_2.11\u003c/artifactId\u003e\n  \u003cversion\u003e1.0.0\u003c/version\u003e\n\u003c/dependency\u003e\n```\n\n### SBT\n\n```sbt\nlibraryDependencies += \"com.github.anicolaspp\" % \"ojai-scala-generics_2.11\" % \"1.0.0\"\n```\n\n## Important Notice\n\nIt is very important to notice, that we are only adding a thin layer on top of the existing OJAI API. Everything that works there will work while using our library. We only add extended functionality. We don't modify existing functionality in any way.\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fanicolaspp%2Fojai-generics","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fanicolaspp%2Fojai-generics","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fanicolaspp%2Fojai-generics/lists"}