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package edu.isi.nlp.files;

import com.google.common.base.Optional;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableSet;
import java.io.IOException;
import javax.annotation.Nonnull;

/**
 * Provides an implementation of {@link KeyValueSource#getRequired(Object)} for convenience.
 *
 * See {@link KeyValueSource} for general documentation of the key-value classes.
 *
 * @author Constantine Lignos, Ryan Gabbard
 */
public abstract class AbstractKeyValueSource implements KeyValueSource {

  @Override
  @Nonnull
  public V getRequired(final K key) throws IOException {
    final Optional value = get(key);
    if (value.isPresent()) {
      return value.get();
    } else {
      throw new NoSuchKeyException("No such key: " + key.toString());
    }
  }

  @Override
  @Nonnull
  public ImmutableSet keySet() throws IOException {
    return FluentIterable.from(keys()).toSet();
  }
}