com.hazelcast.org.apache.calcite.schema.SchemaVersion Maven / Gradle / Ivy
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* 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 com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.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.hazelcast.org.apache.calcite.schema;
/**
* An interface to represent a version ID that can be used to create a
* read-consistent view of a Schema. This interface assumes a strict
* partial ordering contract that is:
*
* - irreflexive: !a.isBefore(a), which means a cannot happen before itself;
*
- transitive: if a.isBefore(b) and b.isBefore(c) then a.isBefore(c);
*
- antisymmetric: if a.isBefore(b) then !b.isBefore(a).
*
* Implementation classes of this interface must also override equals(Object),
* hashCode() and toString().
*
* @see Schema#snapshot(SchemaVersion)
*/
public interface SchemaVersion {
/**
* Returns if this Version happens before the other Version.
* @param other the other Version object
*/
boolean isBefore(SchemaVersion other);
}