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/**
 * 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.crunch;

import java.util.Arrays;

import org.apache.commons.lang.builder.HashCodeBuilder;

/**
 * A {@link Tuple} instance for an arbitrary number of values.
 */
public class TupleN implements Tuple {

  private final Object[] values;

  public static TupleN of(Object... values) {
    return new TupleN(values);
  }

  public TupleN(Object... values) {
    this.values = new Object[values.length];
    System.arraycopy(values, 0, this.values, 0, values.length);
  }

  public Object[] getValues() { return values; }

  @Override
  public Object get(int index) {
    return values[index];
  }

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

  @Override
  public int hashCode() {
    HashCodeBuilder hcb = new HashCodeBuilder();
    for (Object v : values) {
      hcb.append(v);
    }
    return hcb.toHashCode();
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    TupleN other = (TupleN) obj;
    return Arrays.equals(this.values, other.values);
  }

  @Override
  public String toString() {
    return Arrays.toString(values);
  }
}