org.apache.inlong.sort.filesystem.shaded.software.amazon.ion.impl.PrivateSymtabExtendsCache Maven / Gradle / Ivy
/*
* Copyright 2015-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at:
*
* http://aws.amazon.com/apache2.0/
*
* or in the "license" file accompanying this file. This file 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 software.amazon.ion.impl;
import static software.amazon.ion.impl.PrivateUtils.symtabExtends;
import software.amazon.ion.SymbolTable;
/**
* Cache to reduce unnecessary calls to
* {@link PrivateUtils#symtabExtends(SymbolTable, SymbolTable)}. This is
* only used if the writer is stream copy optimized.
* @deprecated This is an internal API that is subject to change without notice.
*/
@Deprecated
public final class PrivateSymtabExtendsCache
{
private SymbolTable myWriterSymtab;
private SymbolTable myReaderSymtab;
private int myWriterSymtabMaxId;
private int myReaderSymtabMaxId;
private boolean myResult;
public boolean symtabsCompat(SymbolTable writerSymtab,
SymbolTable readerSymtab)
{
// If the refs. of both writer's and reader's symtab match and are
// not modified, skip expensive symtab extends check and return
// cached result.
assert writerSymtab != null && readerSymtab != null:
"writer's and reader's current symtab cannot be null";
if (myWriterSymtab == writerSymtab &&
myReaderSymtab == readerSymtab &&
myWriterSymtabMaxId == writerSymtab.getMaxId() &&
myReaderSymtabMaxId == readerSymtab.getMaxId())
{
// Not modified, return cached result
return myResult;
}
myResult = symtabExtends(writerSymtab, readerSymtab);
// Track refs.
myWriterSymtab = writerSymtab;
myReaderSymtab = readerSymtab;
// Track modification
myWriterSymtabMaxId = writerSymtab.getMaxId();
myReaderSymtabMaxId = readerSymtab.getMaxId();
return myResult;
}
}