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/*
* Copyright (c) 2017, Salesforce.com, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.salesforce.op.readers
import org.apache.avro.generic.GenericRecord
import org.apache.hadoop.fs.Path
import scala.reflect.ClassTag
import scala.reflect.runtime.universe.WeakTypeTag
/**
* Just a handy factory for streaming readers
*/
object StreamingReaders {
/**
* Simple streaming reader factory
*/
object Simple {
private[readers] def defaultPathFiler(p: Path) = Seq(".", "_").forall(!p.getName.startsWith(_))
/**
* Creates [[FileStreamingAvroReader]]
*
* @param key function for extracting key from avro record
* @param filter Function to filter paths to process
* @param newFilesOnly Should process only new files and ignore existing files in the directory
*/
def avro[T <: GenericRecord : ClassTag : WeakTypeTag](
key: T => String = ReaderKey.randomKey _,
filter: Path => Boolean = defaultPathFiler,
newFilesOnly: Boolean = false
): FileStreamingAvroReader[T] = new FileStreamingAvroReader[T](key, filter, newFilesOnly)
}
}