| /* |
| * 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.aws2.dynamodb; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| 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; |
| import software.amazon.awssdk.core.SdkBytes; |
| import software.amazon.awssdk.services.dynamodb.model.AttributeValue; |
| |
| /** 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 |
| nul, // 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.s() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.s.toString(), outStream); |
| StringUtf8Coder.of().encode(value.s(), outStream); |
| } else if (value.n() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.n.toString(), outStream); |
| StringUtf8Coder.of().encode(value.n(), outStream); |
| } else if (value.bool() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.bool.toString(), outStream); |
| BooleanCoder.of().encode(value.bool(), outStream); |
| } else if (value.b() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.b.toString(), outStream); |
| ByteArrayCoder.of().encode(value.b().asByteArray(), outStream); |
| } else if (value.ss() != null && value.ss().size() > 0) { |
| StringUtf8Coder.of().encode(AttributeValueType.ss.toString(), outStream); |
| LIST_STRING_CODER.encode(value.ss(), outStream); |
| } else if (value.ns() != null && value.ns().size() > 0) { |
| StringUtf8Coder.of().encode(AttributeValueType.ns.toString(), outStream); |
| LIST_STRING_CODER.encode(value.ns(), outStream); |
| } else if (value.bs() != null && value.bs().size() > 0) { |
| StringUtf8Coder.of().encode(AttributeValueType.bs.toString(), outStream); |
| LIST_BYTE_CODER.encode(convertToListByteArray(value.bs()), outStream); |
| } else if (value.l() != null && value.l().size() > 0) { |
| StringUtf8Coder.of().encode(AttributeValueType.l.toString(), outStream); |
| LIST_ATTRIBUTE_CODER.encode(value.l(), outStream); |
| } else if (value.m() != null && value.m().size() > 0) { |
| StringUtf8Coder.of().encode(AttributeValueType.m.toString(), outStream); |
| MAP_ATTRIBUTE_CODER.encode(value.m(), outStream); |
| } else if (value.nul() != null) { |
| StringUtf8Coder.of().encode(AttributeValueType.nul.toString(), outStream); |
| BooleanCoder.of().encode(value.nul(), outStream); |
| } else { |
| throw new CoderException("Unknown Type"); |
| } |
| } |
| |
| @Override |
| public AttributeValue decode(InputStream inStream) throws IOException { |
| AttributeValue.Builder attrBuilder = AttributeValue.builder(); |
| |
| String type = StringUtf8Coder.of().decode(inStream); |
| AttributeValueType attrType = AttributeValueType.valueOf(type); |
| |
| switch (attrType) { |
| case s: |
| attrBuilder.s(StringUtf8Coder.of().decode(inStream)); |
| break; |
| case n: |
| attrBuilder.n(StringUtf8Coder.of().decode(inStream)); |
| break; |
| case bool: |
| attrBuilder.bool(BooleanCoder.of().decode(inStream)); |
| break; |
| case b: |
| attrBuilder.b(SdkBytes.fromByteArray(ByteArrayCoder.of().decode(inStream))); |
| break; |
| case ss: |
| attrBuilder.ss(LIST_STRING_CODER.decode(inStream)); |
| break; |
| case ns: |
| attrBuilder.ns(LIST_STRING_CODER.decode(inStream)); |
| break; |
| case bs: |
| attrBuilder.bs((convertToListByteBuffer(LIST_BYTE_CODER.decode(inStream)))); |
| break; |
| case l: |
| attrBuilder.l(LIST_ATTRIBUTE_CODER.decode(inStream)); |
| break; |
| case m: |
| attrBuilder.m(MAP_ATTRIBUTE_CODER.decode(inStream)); |
| break; |
| case nul: |
| attrBuilder.nul(BooleanCoder.of().decode(inStream)); |
| break; |
| default: |
| throw new CoderException("Unknown Type"); |
| } |
| |
| return attrBuilder.build(); |
| } |
| |
| private List<byte[]> convertToListByteArray(List<SdkBytes> listSdkByte) { |
| return listSdkByte.stream().map(SdkBytes::asByteArray).collect(Collectors.toList()); |
| } |
| |
| private List<SdkBytes> convertToListByteBuffer(List<byte[]> listByteArr) { |
| return listByteArr.stream().map(SdkBytes::fromByteArray).collect(Collectors.toList()); |
| } |
| } |