com.scurrilous.circe.checksum.Crc32cSse42Provider 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 com.scurrilous.circe.checksum;
import com.scurrilous.circe.Hash;
import com.scurrilous.circe.HashParameters;
import com.scurrilous.circe.HashSupport;
import com.scurrilous.circe.StatelessHash;
import com.scurrilous.circe.crc.Sse42Crc32C;
import com.scurrilous.circe.impl.AbstractHashProvider;
import com.scurrilous.circe.params.CrcParameters;
import java.util.EnumSet;
public final class Crc32cSse42Provider extends AbstractHashProvider {
// Default chunks of 32 KB, then 4 KB, then 512 bytes
private static final int[] DEFAULT_CHUNK = new int[] { 4096, 512, 64 };
public Crc32cSse42Provider() {
super(HashParameters.class);
}
@Override
protected EnumSet querySupportTyped(HashParameters params) {
if (isCrc32C(params) && Sse42Crc32C.isSupported())
return EnumSet.allOf(HashSupport.class);
return EnumSet.noneOf(HashSupport.class);
}
@Override
protected Hash get(HashParameters params, EnumSet required) {
if (isCrc32C(params) && Sse42Crc32C.isSupported())
return getCacheable(params, required);
throw new UnsupportedOperationException();
}
private static boolean isCrc32C(HashParameters params) {
return params.equals(CrcParameters.CRC32C);
}
@Override
protected StatelessHash createCacheable(HashParameters params, EnumSet required) {
return new Sse42Crc32C(DEFAULT_CHUNK);
}
}