org.apache.hadoop.hive.llap.SchemaAwareCacheKey Maven / Gradle / Ivy
/*
* 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.hadoop.hive.llap;
import java.util.Objects;
/**
* Cache key that stores schema hash. Useful caching serdes that do not have a self-describing schema built in.
*/
public class SchemaAwareCacheKey {
public static final int NO_SCHEMA_HASH = -1;
private final Object fileId;
private final int schemaHash;
private SchemaAwareCacheKey(Object fileId, int schemaHash) {
this.fileId = fileId;
this.schemaHash = schemaHash;
}
public static Object buildCacheKey(Object fileId, int schemaHash) {
if (schemaHash == NO_SCHEMA_HASH) {
return fileId;
} else {
return new SchemaAwareCacheKey(fileId, schemaHash);
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
SchemaAwareCacheKey that = (SchemaAwareCacheKey) o;
return schemaHash == that.schemaHash && Objects.equals(fileId, that.fileId);
}
@Override
public int hashCode() {
return Objects.hash(fileId, schemaHash);
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("{fileId=").append(fileId).append(", schemaHash=").append(schemaHash).append('}');
return sb.toString();
}
}