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package edu.isi.nlp;

import com.google.common.base.Equivalence;
import com.google.common.base.Equivalence.Wrapper;
import com.google.common.base.Function;

/**
 * Utilities for Guava {@link Equivalence}s.
 *
 * @author Ryan Gabbard
 */
public final class EquivalenceUtils {

  private EquivalenceUtils() {
    throw new UnsupportedOperationException();
  }

  public static  Function> wrapFunction(
      final Equivalence equivalence) {
    return new Function>() {
      @Override
      public Equivalence.Wrapper apply(final T item) {
        return equivalence.wrap(item);
      }
    };
  }

  public static  Function, T> unwrapFunction() {
    return new Function, T>() {
      @Override
      public T apply(final Equivalence.Wrapper x) {
        return x.get();
      }
    };
  }

  public static  Function, String> toStringThroughWrapperFunction() {
    return new Function, String>() {
      @Override
      public String apply(final Wrapper wrapped) {
        return wrapped.get().toString();
      }
    };
  }
}