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Support encoding and decoding MongoDB entity fields declared as `Obje…
…ct` + Polish code
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128
...s-server-common/src/main/java/im/turms/server/common/storage/mongo/codec/ObjectCodec.java
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| /* | ||
| * Copyright (C) 2019 The Turms Project | ||
| * https://github.com/turms-im/turms | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
|
|
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| package im.turms.server.common.storage.mongo.codec; | ||
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| import java.util.ArrayList; | ||
| import java.util.Date; | ||
| import java.util.LinkedHashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.regex.Pattern; | ||
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| import org.bson.BsonReader; | ||
| import org.bson.BsonType; | ||
| import org.bson.BsonWriter; | ||
| import org.bson.codecs.Codec; | ||
| import org.bson.codecs.DecoderContext; | ||
| import org.bson.codecs.EncoderContext; | ||
| import org.bson.codecs.configuration.CodecRegistry; | ||
| import org.bson.types.MaxKey; | ||
| import org.bson.types.MinKey; | ||
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| /** | ||
| * @author James Chen | ||
| * @implNote Limitations: Since the codec is used for {@link Object}, we cannot know the exact type | ||
| * it should be when decoding, so we use limited types when decoding. | ||
| */ | ||
| public class ObjectCodec extends MongoCodec<Object> { | ||
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| @Override | ||
| public void setRegistry(CodecRegistry registry) { | ||
| super.setRegistry(registry); | ||
| } | ||
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| @Override | ||
| public Object decode(BsonReader reader, DecoderContext decoderContext) { | ||
| return switch (reader.getCurrentBsonType()) { | ||
| case DOUBLE -> reader.readDouble(); | ||
| case STRING -> reader.readString(); | ||
| case DOCUMENT -> { | ||
| // We use LinkedHashMap because we don't know | ||
| // if the user cares about the order or not, | ||
| // so we always use LinkedHashMap to keep the order. | ||
| Map<String, Object> map = new LinkedHashMap<>(); | ||
| reader.readStartDocument(); | ||
| while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) { | ||
| String key = reader.readName(); | ||
| Object value = decode(reader, decoderContext); | ||
| map.put(key, value); | ||
| } | ||
| reader.readEndDocument(); | ||
| yield map; | ||
| } | ||
| case ARRAY -> { | ||
| // For our use cases, we just use small lists in most cases, | ||
| // so 32 is a reasonable size. | ||
| List<Object> list = new ArrayList<>(32); | ||
| reader.readStartArray(); | ||
| while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) { | ||
| Object value = decode(reader, decoderContext); | ||
| list.add(value); | ||
| } | ||
| reader.readEndArray(); | ||
| yield list; | ||
| } | ||
| case BINARY -> reader.readBinaryData() | ||
| .getData(); | ||
| case UNDEFINED -> { | ||
| reader.readUndefined(); | ||
| yield null; | ||
| } | ||
| case OBJECT_ID -> reader.readObjectId(); | ||
| case BOOLEAN -> reader.readBoolean(); | ||
| case DATE_TIME -> new Date(reader.readDateTime()); | ||
| case NULL -> { | ||
| reader.readNull(); | ||
| yield null; | ||
| } | ||
| case REGULAR_EXPRESSION -> Pattern.compile(reader.readRegularExpression() | ||
| .getPattern()); | ||
| case DB_POINTER -> | ||
| throw new UnsupportedOperationException("DBPointer is not supported"); | ||
| case JAVASCRIPT -> reader.readJavaScript(); | ||
| case SYMBOL -> throw new UnsupportedOperationException("Symbol is not supported"); | ||
| case JAVASCRIPT_WITH_SCOPE -> | ||
| throw new UnsupportedOperationException("JavaScriptWithScope is not supported"); | ||
| case INT32 -> reader.readInt32(); | ||
| case TIMESTAMP -> reader.readTimestamp(); | ||
| case INT64 -> reader.readInt64(); | ||
| case DECIMAL128 -> reader.readDecimal128(); | ||
| case MIN_KEY -> { | ||
| reader.readMinKey(); | ||
| yield new MinKey(); | ||
| } | ||
| case MAX_KEY -> { | ||
| reader.readMaxKey(); | ||
| yield new MaxKey(); | ||
| } | ||
| case END_OF_DOCUMENT -> throw new UnsupportedOperationException( | ||
| "The end of document should be handled by the caller"); | ||
| }; | ||
| } | ||
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| @Override | ||
| public void encode(BsonWriter writer, Object value, EncoderContext encoderContext) { | ||
| Class<?> valueClass = value.getClass(); | ||
| if (Object.class == valueClass) { | ||
| throw new IllegalArgumentException("The value class must not be Object"); | ||
| } | ||
| Codec valueCodec = registry.get(valueClass); | ||
| valueCodec.encode(writer, value, encoderContext); | ||
| } | ||
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| } |