com.dimajix.flowman.spec.catalog.CatalogSpec.scala Maven / Gradle / Ivy

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A Spark based ETL tool

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/*
 * Copyright 2018-2020 Kaya Kupferschmidt
 *
 * 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 com.dimajix.flowman.spec.catalog

import com.fasterxml.jackson.annotation.JsonSubTypes
import com.fasterxml.jackson.annotation.JsonTypeInfo

import com.dimajix.common.TypeRegistry
import com.dimajix.flowman.annotation.TemplateObject
import com.dimajix.flowman.catalog.ExternalCatalog
import com.dimajix.flowman.execution.Context
import com.dimajix.flowman.spec.Spec
import com.dimajix.flowman.spec.annotation.CatalogType
import com.dimajix.flowman.spi.ClassAnnotationHandler
import com.dimajix.flowman.templating.Velocity


object CatalogSpec extends TypeRegistry[CatalogSpec] {
}


@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "kind")
@JsonSubTypes(value = Array())
abstract class CatalogSpec extends Spec[ExternalCatalog] {
    def instantiate(context:Context) : ExternalCatalog
}


class CatalogSpecAnnotationHandler extends ClassAnnotationHandler {
    override def annotation: Class[_] = classOf[CatalogType]

    override def register(clazz: Class[_]): Unit =
        CatalogSpec.register(clazz.getAnnotation(classOf[CatalogType]).kind(), clazz.asInstanceOf[Class[_ <: CatalogSpec]])
}