| /* |
| * 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.beam.sdk.coders; |
| |
| import static org.apache.beam.vendor.guava.v20_0.com.google.common.base.Preconditions.checkNotNull; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.math.BigDecimal; |
| import java.math.BigInteger; |
| import java.math.MathContext; |
| |
| /** |
| * A {@link BigDecimalCoder} encodes a {@link BigDecimal} as an integer scale encoded with {@link |
| * VarIntCoder} and a {@link BigInteger} encoded using {@link BigIntegerCoder}. The {@link |
| * BigInteger}, when scaled (with unlimited precision, aka {@link MathContext#UNLIMITED}), yields |
| * the expected {@link BigDecimal}. |
| */ |
| public class BigDecimalCoder extends AtomicCoder<BigDecimal> { |
| |
| public static BigDecimalCoder of() { |
| return INSTANCE; |
| } |
| |
| ///////////////////////////////////////////////////////////////////////////// |
| |
| private static final BigDecimalCoder INSTANCE = new BigDecimalCoder(); |
| |
| private static final VarIntCoder VAR_INT_CODER = VarIntCoder.of(); |
| private static final BigIntegerCoder BIG_INT_CODER = BigIntegerCoder.of(); |
| |
| private BigDecimalCoder() {} |
| |
| @Override |
| public void encode(BigDecimal value, OutputStream outStream) throws IOException, CoderException { |
| encode(value, outStream, Context.NESTED); |
| } |
| |
| @Override |
| public void encode(BigDecimal value, OutputStream outStream, Context context) |
| throws IOException, CoderException { |
| checkNotNull(value, String.format("cannot encode a null %s", BigDecimal.class.getSimpleName())); |
| VAR_INT_CODER.encode(value.scale(), outStream); |
| BIG_INT_CODER.encode(value.unscaledValue(), outStream, context); |
| } |
| |
| @Override |
| public BigDecimal decode(InputStream inStream) throws IOException, CoderException { |
| return decode(inStream, Context.NESTED); |
| } |
| |
| @Override |
| public BigDecimal decode(InputStream inStream, Context context) |
| throws IOException, CoderException { |
| int scale = VAR_INT_CODER.decode(inStream); |
| BigInteger bigInteger = BIG_INT_CODER.decode(inStream, context); |
| return new BigDecimal(bigInteger, scale); |
| } |
| |
| @Override |
| public void verifyDeterministic() throws NonDeterministicException { |
| VAR_INT_CODER.verifyDeterministic(); |
| BIG_INT_CODER.verifyDeterministic(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @return {@code true}. This coder is injective. |
| */ |
| @Override |
| public boolean consistentWithEquals() { |
| return true; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @return {@code true}, because {@link #getEncodedElementByteSize} runs in constant time. |
| */ |
| @Override |
| public boolean isRegisterByteSizeObserverCheap(BigDecimal value) { |
| return true; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @return {@code 4} (the size of an integer denoting the scale) plus {@code 4} (the size of an |
| * integer length prefix for the following bytes) plus the size of the two's-complement |
| * representation of the {@link BigInteger} that, when scaled, equals the given value. |
| */ |
| @Override |
| protected long getEncodedElementByteSize(BigDecimal value) throws Exception { |
| checkNotNull(value, String.format("cannot encode a null %s", BigDecimal.class.getSimpleName())); |
| return VAR_INT_CODER.getEncodedElementByteSize(value.scale()) |
| + BIG_INT_CODER.getEncodedElementByteSize(value.unscaledValue()); |
| } |
| } |