TableInput.java

package com.splout.db.hadoop;

/*
 * #%L
 * Splout SQL Hadoop library
 * %%
 * Copyright (C) 2012 Datasalt Systems S.L.
 * %%
 * 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.
 * #L%
 */

import com.datasalt.pangool.io.ITuple;
import com.datasalt.pangool.io.Schema;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.InputFormat;

import java.util.Map;

/**
 * A file (represented by a Hadoop Path) associated with an Pangool's InputFormat. TableFiles are used by {@link Table} instances
 * to represent a mapping between files and Tables.
 */
public class TableInput {

  private final InputFormat<ITuple, NullWritable> format;
  private final Path[] paths;
  private final Schema fileSchema;
  private final RecordProcessor recordProcessor;
  private final Map<String, String> specificHadoopInputFormatContext;

  TableInput(InputFormat<ITuple, NullWritable> format, Map<String, String> specificHadoopInputFormatContext, Schema fileSchema, RecordProcessor recordProcessor, Path... paths) {
    if (format == null) {
      throw new IllegalArgumentException("Input format can't be null");
    }
    if (fileSchema == null) {
      throw new IllegalArgumentException("File schema can't be null");
    }
    if (recordProcessor == null) {
      throw new IllegalArgumentException("Record processor can't be null. Use new IdentityRecordProcessor() for using the default one.");
    }
    if (paths == null) {
      throw new IllegalArgumentException("Input paths can't be null");
    }
    this.format = format;
    this.fileSchema = fileSchema;
    this.recordProcessor = recordProcessor;
    this.paths = paths;
    this.specificHadoopInputFormatContext = specificHadoopInputFormatContext;
  }

  public InputFormat<ITuple, NullWritable> getFormat() {
    return format;
  }

  public Path[] getPaths() {
    return paths;
  }

  public Schema getFileSchema() {
    return fileSchema;
  }

  public RecordProcessor getRecordProcessor() {
    return recordProcessor;
  }

  public Map<String, String> getSpecificHadoopInputFormatContext() {
    return specificHadoopInputFormatContext;
  }
}