/**
 * 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.hive.hcatalog.data;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.hive.hcatalog.common.HCatException;
import org.apache.hive.hcatalog.data.schema.HCatSchema;

public class DefaultHCatRecord extends HCatRecord {

  private List<Object> contents;

  public DefaultHCatRecord() {
    contents = new ArrayList<Object>();
  }

  public DefaultHCatRecord(int size) {
    contents = new ArrayList<Object>(size);
    for (int i = 0; i < size; i++) {
      contents.add(null);
    }
  }

  @Override
  public void remove(int idx) throws HCatException {
    contents.remove(idx);
  }

  public DefaultHCatRecord(List<Object> list) {
    contents = list;
  }

  @Override
  public Object get(int fieldNum) {
    return contents.get(fieldNum);
  }

  @Override
  public List<Object> getAll() {
    return contents;
  }

  @Override
  public void set(int fieldNum, Object val) {
    contents.set(fieldNum, val);
  }

  @Override
  public int size() {
    return contents.size();
  }

  @Override
  public void readFields(DataInput in) throws IOException {

    contents.clear();
    int len = in.readInt();
    for (int i = 0; i < len; i++) {
      contents.add(ReaderWriter.readDatum(in));
    }
  }

  @Override
  public void write(DataOutput out) throws IOException {
    int sz = size();
    out.writeInt(sz);
    for (int i = 0; i < sz; i++) {
      ReaderWriter.writeDatum(out, contents.get(i));
    }

  }

  @Override
  public int hashCode() {
    int hash = 1;
    for (Object o : contents) {
      if (o != null) {
        hash = 31 * hash + o.hashCode();
      }
    }
    return hash;
  }

  @Override
  public String toString() {

    StringBuilder sb = new StringBuilder();
    for (Object o : contents) {
      sb.append(o + "\t");
    }
    return sb.toString();
  }

  @Override
  public Object get(String fieldName, HCatSchema recordSchema) throws HCatException {
    return get(recordSchema.getPosition(fieldName));
  }

  @Override
  public void set(String fieldName, HCatSchema recordSchema, Object value) throws HCatException {
    set(recordSchema.getPosition(fieldName), value);
  }

  @Override
  public void copy(HCatRecord r) throws HCatException {
    this.contents = r.getAll();
  }

}