content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to you 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 org.apache.calcite.schema.impl;
  
  import org.apache.calcite.schema.SchemaVersion;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /** Implementation of SchemaVersion that uses a long value as representation. */
  public class LongSchemaVersion implements SchemaVersion {
    private final long value;
  
    public LongSchemaVersion(long value) {
      this.value = value;
    }
  
    @Override public boolean isBefore(SchemaVersion other) {
      if (!(other instanceof LongSchemaVersion)) {
        throw new IllegalArgumentException(
            "Cannot compare a LongSchemaVersion object with a "
            + other.getClass() + " object.");
      }
  
      return this.value < ((LongSchemaVersion) other).value;
    }
  
    @Override public boolean equals(@Nullable Object obj) {
      if (this == obj) {
        return true;
      }
  
      if (!(obj instanceof LongSchemaVersion)) {
        return false;
      }
  
      return this.value == ((LongSchemaVersion) obj).value;
    }
  
    @Override public int hashCode() {
      return Long.valueOf(value).hashCode();
    }
  
    @Override public String toString() {
      return String.valueOf(value);
    }
  }
  