ClassKey.java

/*
 * Copyright 2016 Square Inc.
 *
 * 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 flow;

/**
 * Convenience base class for keys. All instances of a given subclass are equal.
 */
public abstract class ClassKey {

  @Override public boolean equals(Object o) {
    return this == o || (o != null && getClass() == o.getClass());
  }

  @Override public int hashCode() {
    return getClass().hashCode();
  }
}