solr/solrj/src/java/org/apache/solr/client/solrj/io/stream/TsvStream.java

/*
 * 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.solr.client.solrj.io.stream;

import java.io.IOException;

import org.apache.solr.client.solrj.io.stream.expr.Explanation;
import org.apache.solr.client.solrj.io.stream.expr.Explanation.ExpressionType;
import org.apache.solr.client.solrj.io.stream.expr.Expressible;
import org.apache.solr.client.solrj.io.stream.expr.StreamExplanation;
import org.apache.solr.client.solrj.io.stream.expr.StreamExpression;
import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;

public class TsvStream extends CsvStream implements Expressible {

  private static final long serialVersionUID = 1;

  public TsvStream(StreamExpression expression,StreamFactory factory) throws IOException {
    super(expression, factory);
  }


  @Override
  public StreamExpression toExpression(StreamFactory factory) throws IOException{
    return toExpression(factory, true);
  }

  private StreamExpression toExpression(StreamFactory factory, boolean includeStreams) throws IOException {
    // function name
    StreamExpression expression = new StreamExpression(factory.getFunctionName(this.getClass()));

    if(includeStreams){
      // streams
      if(originalStream instanceof Expressible){
        expression.addParameter(((Expressible)originalStream).toExpression(factory));
      }
      else{
        throw new IOException("This TsvStream contains a non-expressible TupleStream - it cannot be converted to an expression");
      }
    }
    else{
      expression.addParameter("<stream>");
    }

    return expression;
  }

  @Override
  public Explanation toExplanation(StreamFactory factory) throws IOException {

    return new StreamExplanation(getStreamNodeId().toString())
        .withChildren(new Explanation[] {
            originalStream.toExplanation(factory)
            // we're not including that this is wrapped with a ReducerStream stream because that's just an implementation detail
        })
        .withFunctionName(factory.getFunctionName(this.getClass()))
        .withImplementingClass(this.getClass().getName())
        .withExpressionType(ExpressionType.STREAM_DECORATOR)
        .withExpression(toExpression(factory, false).toString());
  }

  protected String[] split(String line) {
    String[] parts = line.split("\\t", -1);
    return parts;
  }

}