/*
    * Copyright (C) 2009 The Guava Authors
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.apache.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 com.google.common.collect;
  
  import com.google.common.annotations.GwtCompatible;
  
  import java.io.Serializable;
  import java.util.Arrays;
  
  /**
   * A class that implements {@code Comparable} without generics, such as those
   * found in libraries that support Java 1.4 and before. Our library needs to
   * do the bare minimum to accommodate such types, though their use may still
   * require an explicit type parameter and/or warning suppression.
   *
   * @author Kevin Bourrillion
   */
  @GwtCompatible
  class LegacyComparable implements Comparable, Serializable {
    static final LegacyComparable X = new LegacyComparable("x");
    static final LegacyComparable Y = new LegacyComparable("y");
    static final LegacyComparable Z = new LegacyComparable("z");
  
    static final Iterable<LegacyComparable> VALUES_FORWARD
        = Arrays.asList(X, Y, Z);
    static final Iterable<LegacyComparable> VALUES_BACKWARD
        = Arrays.asList(Z, Y, X);
  
    private final String value;
  
    LegacyComparable(String value) {
      this.value = value;
    }
  
    @Override
    public int compareTo(Object object) {
      // This method is spec'd to throw CCE if object is of the wrong type
      LegacyComparable that = (LegacyComparable) object;
      return this.value.compareTo(that.value);
    }
  
    @Override public boolean equals(Object object) {
      if (object instanceof LegacyComparable) {
        LegacyComparable that = (LegacyComparable) object;
        return this.value.equals(that.value);
      }
      return false;
    }
  
    @Override public int hashCode() {
      return value.hashCode();
    }
  
    private static final long serialVersionUID = 0;
  }