/*
* 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.java.typeutils.runtime;
import com.esotericsoftware.kryo.Kryo;
import java.io.IOException;
import org.apache.flink.api.common.typeutils.TypeComparator;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.common.typeutils.TypeSerializerFactory;
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.util.InstantiationUtil;
/**
* TypeComparator for all types that extend Comparable.
*/
public class GenericTypeComparator<T extends Comparable<T>> extends TypeComparator<T> {
private static final long serialVersionUID = 1L;
private final boolean ascending;
private final Class<T> type;
private final TypeSerializerFactory<T> serializerFactory;
private transient TypeSerializer<T> serializer;
private transient T reference;
private transient T tmpReference;
private transient Kryo kryo;
@SuppressWarnings("rawtypes")
private final TypeComparator[] comparators = new TypeComparator[] {this};
// ------------------------------------------------------------------------
public GenericTypeComparator(boolean ascending, TypeSerializer<T> serializer, Class<T> type) {
this.ascending = ascending;
this.serializer = serializer;
this.type = type;
this.serializerFactory = this.serializer.isStateful()
? new RuntimeStatefulSerializerFactory<T>(this.serializer, this.type)
: new RuntimeStatelessSerializerFactory<T>(this.serializer, this.type);
}
private GenericTypeComparator(GenericTypeComparator<T> toClone) {
this.ascending = toClone.ascending;
this.serializerFactory = toClone.serializerFactory;
this.type = toClone.type;
}
@Override
public int hash(T record) {
return record.hashCode();
}
@Override
public void setReference(T toCompare) {
checkKryoInitialized();
this.reference = this.kryo.copy(toCompare);
}
@Override
public boolean equalToReference(T candidate) {
return candidate.equals(this.reference);
}
@Override
public int compareToReference(TypeComparator<T> referencedComparator) {
T otherRef = ((GenericTypeComparator<T>) referencedComparator).reference;
int cmp = otherRef.compareTo(this.reference);
return this.ascending ? cmp : -cmp;
}
@Override
public int compare(T first, T second) {
return first.compareTo(second);
}
@Override
public int compareSerialized(final DataInputView firstSource, final DataInputView secondSource) throws IOException {
if (this.serializer == null) {
this.serializer = this.serializerFactory.getSerializer();
}
if (this.reference == null) {
this.reference = this.serializer.createInstance();
}
if (this.tmpReference == null) {
this.tmpReference = this.serializer.createInstance();
}
this.reference = this.serializer.deserialize(this.reference, firstSource);
this.tmpReference = this.serializer.deserialize(this.tmpReference, secondSource);
int cmp = this.reference.compareTo(this.tmpReference);
return this.ascending ? cmp : -cmp;
}
@Override
public boolean supportsNormalizedKey() {
return NormalizableKey.class.isAssignableFrom(this.type);
}
@Override
public int getNormalizeKeyLen() {
if (this.reference == null) {
this.reference = InstantiationUtil.instantiate(this.type);
}
NormalizableKey<?> key = (NormalizableKey<?>) this.reference;
return key.getMaxNormalizedKeyLen();
}
@Override
public boolean isNormalizedKeyPrefixOnly(int keyBytes) {
return keyBytes < getNormalizeKeyLen();
}
@Override
public void putNormalizedKey(T record, MemorySegment target, int offset, int numBytes) {
NormalizableKey<?> key = (NormalizableKey<?>) record;
key.copyNormalizedKey(target, offset, numBytes);
}
@Override
public boolean invertNormalizedKey() {
return !ascending;
}
@Override
public TypeComparator<T> duplicate() {
return new GenericTypeComparator<T>(this);
}
private void checkKryoInitialized() {
if (this.kryo == null) {
this.kryo = new Kryo();
this.kryo.setAsmEnabled(true);
this.kryo.register(this.type);
}
}
@Override
public int extractKeys(Object record, Object[] target, int index) {
target[index] = record;
return 1;
}
@SuppressWarnings("rawtypes")
@Override
public TypeComparator[] getFlatComparators() {
return comparators;
}
// ------------------------------------------------------------------------
@Override
public boolean supportsSerializationWithKeyNormalization() {
return false;
}
@Override
public void writeWithKeyNormalization(T record, DataOutputView target) throws IOException {
throw new UnsupportedOperationException();
}
@Override
public T readWithKeyDenormalization(T reuse, DataInputView source) throws IOException {
throw new UnsupportedOperationException();
}
}