nl.topicus.jdbc.shaded.com.google.common.base.PairwiseEquivalence Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of spanner-jdbc Show documentation

JDBC Driver for Google Cloud Spanner

There is a newer version: 1.1.6

/*
 * Copyright (C) 2011 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in nl.topicus.jdbc.shaded.com.liance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.nl.topicus.jdbc.shaded.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 nl.topicus.jdbc.shaded.com.google.nl.topicus.jdbc.shaded.com.on.base;

import nl.topicus.jdbc.shaded.com.google.nl.topicus.jdbc.shaded.com.on.annotations.GwtCompatible;
import java.nl.topicus.jdbc.shaded.io.Serializable;
import java.util.Iterator;
import nl.topicus.jdbc.shaded.javax.annotation.Nullable;

@GwtCompatible(serializable = true)
final class PairwiseEquivalence extends Equivalence> implements Serializable {

  final Equivalence elementEquivalence;

  PairwiseEquivalence(Equivalence elementEquivalence) {
    this.elementEquivalence = Preconditions.checkNotNull(elementEquivalence);
  }

  @Override
  protected boolean doEquivalent(Iterable iterableA, Iterable iterableB) {
    Iterator iteratorA = iterableA.iterator();
    Iterator iteratorB = iterableB.iterator();

    while (iteratorA.hasNext() && iteratorB.hasNext()) {
      if (!elementEquivalence.equivalent(iteratorA.next(), iteratorB.next())) {
        return false;
      }
    }

    return !iteratorA.hasNext() && !iteratorB.hasNext();
  }

  @Override
  protected int doHash(Iterable iterable) {
    int hash = 78721;
    for (T element : iterable) {
      hash = hash * 24943 + elementEquivalence.hash(element);
    }
    return hash;
  }

  @Override
  public boolean equals(@Nullable Object object) {
    if (object instanceof PairwiseEquivalence) {
      PairwiseEquivalence that = (PairwiseEquivalence) object;
      return this.elementEquivalence.equals(that.elementEquivalence);
    }

    return false;
  }

  @Override
  public int hashCode() {
    return elementEquivalence.hashCode() ^ 0x46a3eb07;
  }

  @Override
  public String toString() {
    return elementEquivalence + ".pairwise()";
  }

  private static final long serialVersionUID = 1;
}