| /* |
| * 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.core.memory.DataInputView; |
| import org.apache.flink.core.memory.DataOutputView; |
| |
| import java.io.IOException; |
| import java.math.BigInteger; |
| |
| /** |
| * Serializer for serializing/deserializing BigInteger values including null values. |
| */ |
| @Internal |
| public final class BigIntSerializer extends TypeSerializerSingleton<BigInteger> { |
| |
| private static final long serialVersionUID = 1L; |
| |
| public static final BigIntSerializer INSTANCE = new BigIntSerializer(); |
| |
| @Override |
| public boolean isImmutableType() { |
| return true; |
| } |
| |
| @Override |
| public BigInteger createInstance() { |
| return BigInteger.ZERO; |
| } |
| |
| @Override |
| public BigInteger copy(BigInteger from) { |
| return from; |
| } |
| |
| @Override |
| public BigInteger copy(BigInteger from, BigInteger reuse) { |
| return from; |
| } |
| |
| @Override |
| public int getLength() { |
| return -1; |
| } |
| |
| @Override |
| public void serialize(BigInteger record, DataOutputView target) throws IOException { |
| writeBigInteger(record, target); |
| } |
| |
| @Override |
| public BigInteger deserialize(DataInputView source) throws IOException { |
| return readBigInteger(source); |
| } |
| |
| @Override |
| public BigInteger deserialize(BigInteger reuse, DataInputView source) throws IOException { |
| return readBigInteger(source); |
| } |
| |
| @Override |
| public void copy(DataInputView source, DataOutputView target) throws IOException { |
| copyBigInteger(source, target); |
| } |
| |
| @Override |
| public boolean canEqual(Object obj) { |
| return obj instanceof BigIntSerializer; |
| } |
| |
| // -------------------------------------------------------------------------------------------- |
| // Static Helpers for BigInteger Serialization |
| // -------------------------------------------------------------------------------------------- |
| |
| public static void writeBigInteger(BigInteger record, DataOutputView target) throws IOException { |
| // null value support |
| if (record == null) { |
| target.writeInt(0); |
| return; |
| } |
| // fast paths for 0, 1, 10 |
| // only reference equality is checked because equals would be too expensive |
| else if (record == BigInteger.ZERO) { |
| target.writeInt(1); |
| return; |
| } |
| else if (record == BigInteger.ONE) { |
| target.writeInt(2); |
| return; |
| } |
| else if (record == BigInteger.TEN) { |
| target.writeInt(3); |
| return; |
| } |
| // default |
| final byte[] bytes = record.toByteArray(); |
| // the length we write is offset by four, because null and short-paths for ZERO, ONE, and TEN |
| target.writeInt(bytes.length + 4); |
| target.write(bytes); |
| } |
| |
| public static BigInteger readBigInteger(DataInputView source) throws IOException { |
| final int len = source.readInt(); |
| if (len < 4) { |
| switch (len) { |
| case 0: |
| return null; |
| case 1: |
| return BigInteger.ZERO; |
| case 2: |
| return BigInteger.ONE; |
| case 3: |
| return BigInteger.TEN; |
| } |
| } |
| final byte[] bytes = new byte[len - 4]; |
| source.readFully(bytes); |
| return new BigInteger(bytes); |
| } |
| |
| public static boolean copyBigInteger(DataInputView source, DataOutputView target) throws IOException { |
| final int len = source.readInt(); |
| target.writeInt(len); |
| if (len > 4) { |
| target.write(source, len - 4); |
| } |
| return len == 0; // returns true if the copied record was null |
| } |
| } |