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Tiny framework for using tuples as first-class citizens in Java.

There is a newer version: 1.1.2

package com.mmnaseri.utils.tuples.impl;

import com.mmnaseri.utils.tuples.Tuple;
import com.mmnaseri.utils.tuples.utils.FluentList;

import java.util.List;
import java.util.Objects;

import static com.mmnaseri.utils.tuples.utils.TupleUtils.checkIndex;
import static java.util.stream.Collectors.joining;

/**
 * The base class for the tuples. This class caches the list value for the tuple and uses that to
 * calculate the hash code and string representation of the tuple.
 */
public abstract class AbstractTuple implements Tuple {

  private static final String STRING_FORMAT = "<%s>";
  private final String string;
  private final int hashCode;
  private final FluentList values;

  protected AbstractTuple(List values) {
    this.values = FluentList.of(values);
    string = String.format(STRING_FORMAT, stream().map(Objects::toString).collect(joining(", ")));
    hashCode = Objects.hashCode(asList());
  }

  @Override
  public FluentList asList() {
    return values;
  }

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

  @Override
  public Z get(final int i) {
    checkIndex(i, size());
    return values.get(i);
  }

  @Override
  public String toString() {
    return string;
  }

  @Override
  public boolean equals(final Object obj) {
    return obj instanceof Tuple && Objects.equals(asList(), ((Tuple) obj).asList());
  }

  @Override
  public int hashCode() {
    return hashCode;
  }
}