| /* |
| * 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 org.apache.flink.annotation.Internal; |
| import org.apache.flink.api.common.typeutils.TypeComparator; |
| import org.apache.flink.core.memory.DataInputView; |
| import org.apache.flink.core.memory.DataOutputView; |
| import org.apache.flink.core.memory.MemorySegment; |
| import org.apache.flink.types.NormalizableKey; |
| import org.apache.flink.types.NullValue; |
| |
| import java.io.IOException; |
| |
| /** |
| * Specialized comparator for NullValue based on CopyableValueComparator. |
| */ |
| @Internal |
| public class NullValueComparator extends TypeComparator<NullValue> { |
| |
| private static final long serialVersionUID = 1L; |
| |
| private final TypeComparator<?>[] comparators = new TypeComparator[] {this}; |
| |
| private final static NullValueComparator INSTANCE = new NullValueComparator(); |
| |
| public static NullValueComparator getInstance() { |
| return INSTANCE; |
| } |
| |
| private NullValueComparator() {} |
| |
| @Override |
| public int hash(NullValue record) { |
| return record.hashCode(); |
| } |
| |
| @Override |
| public void setReference(NullValue toCompare) {} |
| |
| @Override |
| public boolean equalToReference(NullValue candidate) { |
| return true; |
| } |
| |
| @Override |
| public int compareToReference(TypeComparator<NullValue> referencedComparator) { |
| return 0; |
| } |
| |
| @Override |
| public int compare(NullValue first, NullValue second) { |
| return 0; |
| } |
| |
| @Override |
| public int compareSerialized(DataInputView firstSource, DataInputView secondSource) throws IOException { |
| return 0; |
| } |
| |
| @Override |
| public boolean supportsNormalizedKey() { |
| return NormalizableKey.class.isAssignableFrom(NullValue.class); |
| } |
| |
| @Override |
| public int getNormalizeKeyLen() { |
| return NullValue.getInstance().getMaxNormalizedKeyLen(); |
| } |
| |
| @Override |
| public boolean isNormalizedKeyPrefixOnly(int keyBytes) { |
| return keyBytes < getNormalizeKeyLen(); |
| } |
| |
| @Override |
| public void putNormalizedKey(NullValue record, MemorySegment target, int offset, int numBytes) { |
| record.copyNormalizedKey(target, offset, numBytes); |
| } |
| |
| @Override |
| public boolean invertNormalizedKey() { |
| return false; |
| } |
| |
| @Override |
| public TypeComparator<NullValue> duplicate() { |
| return NullValueComparator.getInstance(); |
| } |
| |
| @Override |
| public int extractKeys(Object record, Object[] target, int index) { |
| target[index] = record; |
| return 1; |
| } |
| |
| @Override |
| public TypeComparator<?>[] getFlatComparators() { |
| return comparators; |
| } |
| |
| // -------------------------------------------------------------------------------------------- |
| // unsupported normalization |
| // -------------------------------------------------------------------------------------------- |
| |
| @Override |
| public boolean supportsSerializationWithKeyNormalization() { |
| return false; |
| } |
| |
| @Override |
| public void writeWithKeyNormalization(NullValue record, DataOutputView target) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public NullValue readWithKeyDenormalization(NullValue reuse, DataInputView source) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| } |