| /* |
| * 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.flink.api.common.typeutils.base; |
| |
| import java.io.IOException; |
| |
| import org.apache.flink.annotation.Internal; |
| import org.apache.flink.core.memory.DataInputView; |
| import org.apache.flink.core.memory.MemorySegment; |
| |
| @Internal |
| public final class ByteComparator extends BasicTypeComparator<Byte> { |
| |
| private static final long serialVersionUID = 1L; |
| |
| |
| public ByteComparator(boolean ascending) { |
| super(ascending); |
| } |
| |
| @Override |
| public int compareSerialized(DataInputView firstSource, DataInputView secondSource) throws IOException { |
| byte b1 = firstSource.readByte(); |
| byte b2 = secondSource.readByte(); |
| int comp = (b1 < b2 ? -1 : (b1 == b2 ? 0 : 1)); |
| return ascendingComparison ? comp : -comp; |
| } |
| |
| |
| @Override |
| public boolean supportsNormalizedKey() { |
| return true; |
| } |
| |
| @Override |
| public int getNormalizeKeyLen() { |
| return 1; |
| } |
| |
| @Override |
| public boolean isNormalizedKeyPrefixOnly(int keyBytes) { |
| return keyBytes < 1; |
| } |
| |
| @Override |
| public void putNormalizedKey(Byte value, MemorySegment target, int offset, int numBytes) { |
| if (numBytes == 1) { |
| // default case, full normalized key. need to explicitly convert to int to |
| // avoid false results due to implicit type conversion to int when subtracting |
| // the min byte value |
| int highByte = value & 0xff; |
| highByte -= Byte.MIN_VALUE; |
| target.put(offset, (byte) highByte); |
| } |
| else if (numBytes <= 0) { |
| } |
| else { |
| int highByte = value & 0xff; |
| highByte -= Byte.MIN_VALUE; |
| target.put(offset, (byte) highByte); |
| for (int i = 1; i < numBytes; i++) { |
| target.put(offset + i, (byte) 0); |
| } |
| } |
| } |
| |
| @Override |
| public ByteComparator duplicate() { |
| return new ByteComparator(ascendingComparison); |
| } |
| } |