TupleConverter.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 parquet.cascading.convert;

import cascading.tuple.Tuple;

import parquet.io.ParquetDecodingException;
import parquet.io.api.Binary;
import parquet.io.api.Converter;
import parquet.io.api.GroupConverter;
import parquet.io.api.PrimitiveConverter;
import parquet.pig.TupleConversionException;
import parquet.schema.GroupType;
import parquet.schema.OriginalType;
import parquet.schema.PrimitiveType;
import parquet.schema.Type;
import parquet.schema.Type.Repetition;

public class TupleConverter extends GroupConverter {

  protected Tuple currentTuple;
  private final Converter[] converters;

  public TupleConverter(GroupType parquetSchema) {
    int schemaSize = parquetSchema.getFieldCount();

    this.converters = new Converter[schemaSize];
    for (int i = 0; i < schemaSize; i++) {
      Type type = parquetSchema.getType(i);
      converters[i] = newConverter(type, i);
    }
  }

  private Converter newConverter(Type type, int i) {
    if(!type.isPrimitive()) {
      throw new IllegalArgumentException("cascading can only build tuples from primitive types");
    } else {
      return new TuplePrimitiveConverter(this, i);
    }
  }

  @Override
  public Converter getConverter(int fieldIndex) {
    return converters[fieldIndex];
  }

  @Override
  final public void start() {
    currentTuple = Tuple.size(converters.length);
  }

  @Override
  public void end() {
  }

  final public Tuple getCurrentTuple() {
    return currentTuple;
  }

  static final class TuplePrimitiveConverter extends PrimitiveConverter {
    private final TupleConverter parent;
    private final int index;

    public TuplePrimitiveConverter(TupleConverter parent, int index) {
      this.parent = parent;
      this.index = index;
    }

    @Override
    public void addBinary(Binary value) {
      parent.getCurrentTuple().setString(index, value.toStringUsingUTF8());
    }

    @Override
    public void addBoolean(boolean value) {
      parent.getCurrentTuple().setBoolean(index, value);
    }

    @Override
    public void addDouble(double value) {
      parent.getCurrentTuple().setDouble(index, value);
    }

    @Override
    public void addFloat(float value) {
      parent.getCurrentTuple().setFloat(index, value);
    }

    @Override
    public void addInt(int value) {
      parent.getCurrentTuple().setInteger(index, value);
    }

    @Override
    public void addLong(long value) {
      parent.getCurrentTuple().setLong(index, value);
    }
  }
}