| /* |
| * 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.io.aws.dynamodb; |
| |
| import com.amazonaws.services.dynamodbv2.model.AttributeValue; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.nio.ByteBuffer; |
| import java.util.List; |
| import java.util.stream.Collectors; |
| import org.apache.beam.sdk.coders.AtomicCoder; |
| import org.apache.beam.sdk.coders.BooleanCoder; |
| import org.apache.beam.sdk.coders.ByteArrayCoder; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.coders.CoderException; |
| import org.apache.beam.sdk.coders.ListCoder; |
| import org.apache.beam.sdk.coders.MapCoder; |
| import org.apache.beam.sdk.coders.StringUtf8Coder; |
| |
| /** A {@link Coder} that serializes and deserializes the {@link AttributeValue} objects. */ |
| public class AttributeValueCoder extends AtomicCoder<AttributeValue> { |
| |
| /** Data type of each value type in AttributeValue object. */ |
| private enum AttributeValueType { |
| s, // for String |
| n, // for Number |
| b, // for Byte |
| sS, // for List of String |
| nS, // for List of Number |
| bS, // for List of Byte |
| m, // for Map of String and AttributeValue |
| l, // for list of AttributeValue |
| bOOL, // for Boolean |
| nULLValue, // for null |
| } |
| |
| private static final AttributeValueCoder INSTANCE = new AttributeValueCoder(); |
| |
| private static final ListCoder<String> LIST_STRING_CODER = ListCoder.of(StringUtf8Coder.of()); |
| private static final ListCoder<byte[]> LIST_BYTE_CODER = ListCoder.of(ByteArrayCoder.of()); |
| |
| private static final ListCoder<AttributeValue> LIST_ATTRIBUTE_CODER = |
| ListCoder.of(AttributeValueCoder.of()); |
| private static final MapCoder<String, AttributeValue> MAP_ATTRIBUTE_CODER = |
| MapCoder.of(StringUtf8Coder.of(), AttributeValueCoder.of()); |
| |
| private AttributeValueCoder() {} |
| |
| public static AttributeValueCoder of() { |
| return INSTANCE; |
| } |
| |
| @Override |
| public void encode(AttributeValue value, OutputStream outStream) throws IOException { |
| |
| if (value.getS() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.s.toString(), outStream); |
| StringUtf8Coder.of().encode(value.getS(), outStream); |
| } else if (value.getN() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.n.toString(), outStream); |
| StringUtf8Coder.of().encode(value.getN(), outStream); |
| } else if (value.getBOOL() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.bOOL.toString(), outStream); |
| BooleanCoder.of().encode(value.getBOOL(), outStream); |
| } else if (value.getB() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.b.toString(), outStream); |
| ByteArrayCoder.of().encode(convertToByteArray(value.getB()), outStream); |
| } else if (value.getSS() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.sS.toString(), outStream); |
| LIST_STRING_CODER.encode(value.getSS(), outStream); |
| } else if (value.getNS() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.nS.toString(), outStream); |
| LIST_STRING_CODER.encode(value.getNS(), outStream); |
| } else if (value.getBS() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.bS.toString(), outStream); |
| LIST_BYTE_CODER.encode(convertToListByteArray(value.getBS()), outStream); |
| } else if (value.getL() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.l.toString(), outStream); |
| LIST_ATTRIBUTE_CODER.encode(value.getL(), outStream); |
| } else if (value.getM() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.m.toString(), outStream); |
| MAP_ATTRIBUTE_CODER.encode(value.getM(), outStream); |
| } else if (value.getNULL() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.nULLValue.toString(), outStream); |
| BooleanCoder.of().encode(value.getNULL(), outStream); |
| } else { |
| throw new CoderException("Unknown Type"); |
| } |
| } |
| |
| @Override |
| public AttributeValue decode(InputStream inStream) throws IOException { |
| AttributeValue attrValue = new AttributeValue(); |
| |
| String type = StringUtf8Coder.of().decode(inStream); |
| AttributeValueType attrType = AttributeValueType.valueOf(type); |
| |
| switch (attrType) { |
| case s: |
| attrValue.setS(StringUtf8Coder.of().decode(inStream)); |
| break; |
| case n: |
| attrValue.setN(StringUtf8Coder.of().decode(inStream)); |
| break; |
| case bOOL: |
| attrValue.setBOOL(BooleanCoder.of().decode(inStream)); |
| break; |
| case b: |
| attrValue.setB(ByteBuffer.wrap(ByteArrayCoder.of().decode(inStream))); |
| break; |
| case sS: |
| attrValue.setSS(LIST_STRING_CODER.decode(inStream)); |
| break; |
| case nS: |
| attrValue.setNS(LIST_STRING_CODER.decode(inStream)); |
| break; |
| case bS: |
| attrValue.setBS(convertToListByteBuffer(LIST_BYTE_CODER.decode(inStream))); |
| break; |
| case l: |
| attrValue.setL(LIST_ATTRIBUTE_CODER.decode(inStream)); |
| break; |
| case m: |
| attrValue.setM(MAP_ATTRIBUTE_CODER.decode(inStream)); |
| break; |
| case nULLValue: |
| attrValue.setNULL(BooleanCoder.of().decode(inStream)); |
| break; |
| default: |
| throw new CoderException("Unknown Type"); |
| } |
| |
| return attrValue; |
| } |
| |
| private List<byte[]> convertToListByteArray(List<ByteBuffer> listByteBuffer) { |
| return listByteBuffer.stream().map(this::convertToByteArray).collect(Collectors.toList()); |
| } |
| |
| private byte[] convertToByteArray(ByteBuffer buffer) { |
| byte[] bytes = new byte[buffer.remaining()]; |
| buffer.get(bytes); |
| buffer.position(buffer.position() - bytes.length); |
| return bytes; |
| } |
| |
| private List<ByteBuffer> convertToListByteBuffer(List<byte[]> listByteArr) { |
| return listByteArr.stream().map(ByteBuffer::wrap).collect(Collectors.toList()); |
| } |
| } |