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Zeus Core

There is a newer version: 2.29.0

package io.contek.zeus;

import com.google.common.hash.HashFunction;
import com.google.common.hash.Hashing;

import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;

import static java.nio.charset.StandardCharsets.UTF_8;

@Immutable
public abstract class StringKey {

  private static final HashFunction HASH_FUNCTION = Hashing.murmur3_128();

  private final String stringValue;
  private int hashCode;

  protected StringKey(String stringValue) {
    this.stringValue = stringValue;
  }

  public final String getStringValue() {
    return stringValue;
  }

  @Override
  public final boolean equals(@Nullable Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    StringKey that = (StringKey) o;
    return stringValue.equals(that.stringValue);
  }

  @Override
  public final int hashCode() {
    if (hashCode == 0) {
      hashCode = HASH_FUNCTION.hashString(stringValue, UTF_8).asInt();
    }
    return hashCode;
  }

  @Override
  public final String toString() {
    return stringValue;
  }
}