Schema validator (#50)

* Adds the schema provider and schema validator

* Improves the schema provider and validator

* Adds tests for the schema provider and validator

build.sbt

@@ -13,7 +13,7 @@ lazy val commonDependencies: Seq[ModuleID] = Seq(
   %("cassandra-driver-core"),
   %("cassandra-driver-mapping"),
   %("cassandra-driver-extras"),
-  "org.scala-lang.modules" %% "scala-parser-combinators" % "1.0.6"
+  "io.github.cassandra-scala" %% "troy-schema" % "0.4.0"
 )
 
 lazy val testDependencies: Seq[ModuleID] =
@@ -35,5 +35,6 @@ lazy val core = project
   .in(file("core"))
   .settings(moduleName := "freestyle-cassandra-core")
   .settings(scalaMetaSettings)
+  .settings(resolvers += Resolver.bintrayRepo("tabdulradi", "maven"))
   .settings(libraryDependencies ++= commonDependencies)
   .settings(libraryDependencies ++= testDependencies)

core/src/main/scala/schema/package.scala

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2017 47 Degrees, LLC. <http://www.47deg.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package freestyle.cassandra
+
+import troy.cql.ast.{DataDefinition, DataManipulation}
+
+package object schema {
+
+  sealed abstract class SchemaError(msg: String, maybeCause: Option[Throwable] = None)
+      extends RuntimeException(msg) {
+    maybeCause foreach initCause
+  }
+
+  case class SchemaDefinitionProviderError(msg: String, maybeCause: Option[Throwable] = None)
+      extends SchemaError(msg, maybeCause)
+
+  case class SchemaValidatorError(msg: String, maybeCause: Option[Throwable] = None)
+      extends SchemaError(msg, maybeCause)
+
+  type SchemaDefinition = Seq[DataDefinition]
+  type Statement        = DataManipulation
+
+}

core/src/main/scala/schema/provider/TroySchemaProvider.scala

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2017 47 Degrees, LLC. <http://www.47deg.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package freestyle.cassandra
+package schema.provider
+
+import freestyle.cassandra.schema._
+import troy.cql.ast.CqlParser
+
+class TroySchemaProvider(cql: String) extends SchemaDefinitionProvider {
+
+  override def schemaDefinition: Either[SchemaDefinitionProviderError, SchemaDefinition] =
+    CqlParser.parseSchema(cql) match {
+      case CqlParser.Success(res, _) => Right(res)
+      case CqlParser.Failure(msg, next) =>
+        Left(
+          SchemaDefinitionProviderError(
+            s"Parse Failure: $msg, line = ${next.pos.line}, column = ${next.pos.column}"))
+      case CqlParser.Error(msg, _) => Left(SchemaDefinitionProviderError(msg))
+    }
+}

core/src/main/scala/schema/provider/package.scala

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2017 47 Degrees, LLC. <http://www.47deg.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package freestyle.cassandra
+package schema
+
+package object provider {
+
+  trait SchemaDefinitionProvider {
+    def schemaDefinition: Either[SchemaDefinitionProviderError, SchemaDefinition]
+  }
+
+}