/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.wayang.apps.simwords

import java.lang.Iterable
import java.util

import org.apache.wayang.core.function.ExecutionContext
import org.apache.wayang.core.function.FunctionDescriptor.ExtendedSerializableFunction

/**
  * UDF to split text lines and scrub the tokens.
  */
class ScrubFunction extends ExtendedSerializableFunction[String, java.lang.Iterable[String]] {

  lazy val textScrubber = new TextScrubber

  override def open(ctx: ExecutionContext): Unit = {}

  override def apply(line: String): Iterable[String] = {
    val result = new util.LinkedList[String]()
    textScrubber.splitAndScrub(line, result)
    result
  }

}