Java BsonReader.readName方法代码示例

import org.bson.BsonReader; //导入方法依赖的package包/类
@Override
public T decode(BsonReader reader, DecoderContext decoderContext) {
    T map = newInstance();
    reader.readStartDocument();
    while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) {
        String key = reader.readName();

        Object value;
        Codec fieldMappingCodec = fieldMappingCodecs.get(key);
        if (fieldMappingCodec != null) {
            value = fieldMappingCodec.decode(reader, decoderContext);
        } else {
            value = readValue(reader, decoderContext);
        }

        map.put(key, value);
    }
    reader.readEndDocument();
    return map;
}
 

import org.bson.BsonReader; //导入方法依赖的package包/类
@Override
public Map<String, V> decode(BsonReader reader, DecoderContext decoderContext) {
    Map<String, V> map = newInstance();
    if (BsonType.DOCUMENT.equals(reader.getCurrentBsonType())) {
        reader.readStartDocument();
        while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) {
            String key = reader.readName();
            V value = valueTypeCodec.decode(reader, decoderContext);
            map.put(key, value);
        }
        reader.readEndDocument();
    } else {
        LOGGER.warn("Expected {} from reader but got {}. Skipping value.", BsonType.DOCUMENT, reader.getCurrentBsonType());
        reader.skipValue();
    }
    return map;
}
 

import org.bson.BsonReader; //导入方法依赖的package包/类
@Override
public Map<K, V> decode(BsonReader reader, DecoderContext decoderContext) {
    Map<K, V> map = newInstance();
    if (BsonType.ARRAY.equals(reader.getCurrentBsonType())) {
        reader.readStartArray();
        while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) {
            if (BsonType.DOCUMENT.equals(reader.getCurrentBsonType())) {
                reader.readStartDocument();
                reader.readName(); // don't need the key == "key"
                K key = keyTypeCodec.decode(reader, decoderContext);
                reader.readName(); // don't need the key == "value"
                V value = valueTypeCodec.decode(reader, decoderContext);
                map.put(key, value);
                reader.readEndDocument();
            } else {
                LOGGER.warn("Expected {} from reader but got {}. Skipping value.", BsonType.DOCUMENT, reader.getCurrentBsonType());
                reader.skipValue();
            }
        }
        reader.readEndArray();
    } else {
        LOGGER.warn("Expected {} from reader but got {}. Skipping value.", BsonType.ARRAY, reader.getCurrentBsonType());
        reader.skipValue();
    }
    return map;
}
 

import org.bson.BsonReader; //导入方法依赖的package包/类
@Override
public CustomType decode(BsonReader reader, DecoderContext decoderContext) {
    reader.readStartDocument();
    reader.readName("name");
    String name = nameCodec.decode(reader, decoderContext);

    reader.readName("list");
    List<T> stringArrayList = listCodec.decode(reader, decoderContext);

    reader.readName("innerType");
    InnerType<T> innerType = innerTypeCodec.decode(reader, decoderContext);

    reader.readEndDocument();
    CustomType<T> customType = new CustomType(name);
    customType.setInnerType(innerType);
    customType.addAll(stringArrayList);

    return customType;
}
 

import org.bson.BsonReader; //导入方法依赖的package包/类
@Override
public T decodeFields(BsonReader reader, DecoderContext decoderContext, T instance) {
    MetaData documentMeta = instance.getMeta();
    while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) {
        String fieldName = reader.readName();
        if ("data".equals(fieldName)) {
            reader.readStartDocument();
            super.decodeFields(reader, decoderContext, instance);
            reader.readEndDocument();
        } else {
            MappedField field = documentMetaCodec.getMappedField(fieldName);
            if (field != null) {
                field.decode(reader, documentMeta, decoderContext);
            } else {
                reader.skipValue();
            }
        }
    }

    documentMetaCodec.postDecode(documentMeta);

    return instance;
}
 

import org.bson.BsonReader; //导入方法依赖的package包/类
public T decodeFields(BsonReader reader, DecoderContext decoderContext, T instance) {
    while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) {
        String fieldName = reader.readName();
        if ("enum".equals(fieldName)) {
            return codec.decode(reader, decoderContext);
        }
        else
        {
            reader.skipValue();
        }
    }
    // throw new EnumValueNotFoundException??? instead of returning null?
    return null;
}
 

import org.bson.BsonReader; //导入方法依赖的package包/类
/**
 * bsonReader中读取Bson到POJO/decode from bsonReader->POJO
 *
 * @param bsonReader
 * @param targetClazz
 * @param bsonMapperConfig
 * @param <T>
 * @return
 */
<T> T decode(BsonReader bsonReader, Class<T> targetClazz, BsonMapperConfig bsonMapperConfig) {
    MAPPER_LAYER_COUNTER.addCount(bsonMapperConfig);
    try {
        bsonReader.readStartDocument();
        Map<String, Field> bsonNameFieldInfoMap = getBsonNameFieldInfoMap(targetClazz);
        T target = Utils.newInstanceByClazz(targetClazz);
        while (bsonReader.readBsonType() != BsonType.END_OF_DOCUMENT) {
            String bsonName = bsonReader.readName();
            Field field = bsonNameFieldInfoMap.get(bsonName);
            if (field == null || bsonReader.getCurrentBsonType() == BsonType.NULL) {
                bsonReader.skipValue();
                continue;
            }
            Object javaValue;
            try {
                javaValue = getJavaValueByBinaryReader(bsonReader, field, bsonMapperConfig);
            } catch (BsonMapperConverterException e) {
                throw new BsonMapperConverterException("error when try to get java value from Bson.BsonName:" + bsonName, e);
            }
            setJavaValueToField(targetClazz, target, field, javaValue);
        }
        bsonReader.readEndDocument();
        return target;
    } finally {
        MAPPER_LAYER_COUNTER.reduceCount();
    }
}
 

import org.bson.BsonReader; //导入方法依赖的package包/类
@Override
public T decode(BsonReader reader, DecoderContext decoderContext) {
    if (reader.getCurrentBsonType() == BsonType.NULL) {
        reader.readNull();
        return null;
    }

    String discriminator = null;
    reader.mark();
    reader.readStartDocument();
    PolymorphicCodec<T> codec = null;
    while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) {
        String fieldName = reader.readName();
        if (allDiscriminatorKeys.contains(fieldName)) {
            discriminator = reader.readString();
            codec = getCodecForDiscriminator(discriminator);
            if (codec != null) {
                //now check that the codec found actually has the correct
                String discriminatorKeyForClass = discriminatorKeys.get(codec.getEncoderClass());
                if (fieldName.equals(discriminatorKeyForClass)) {
                    break;
                } else {
                    discriminator = null;
                    codec = null;
                    LOGGER.warn("Confusing. Skipping discriminator {} encoded in discriminator key {} since the " +
                                    "destination class is declaring a different discriminator key {}.",
                            discriminator, fieldName, discriminatorKeyForClass);
                }
            }
        } else {
            reader.skipValue();
        }
    }

    reader.reset();

    // try fallback and legacy handling
    if (codec == null) {
        if (discriminator != null) {
            LOGGER.warn("At least one valid discriminator {} was found in database, but no matching codec found at all.", discriminator);
            reader.skipValue();
            return null; // todo: when switching to mongo db 3.6 an exception should be thrown instead of returning null
        }
        LOGGER.debug("No discriminator found in db for entity. Trying fallback. Fallback is {}", fallBackCodec);
        codec = fallBackCodec;
        if (codec == null) {
            LOGGER.debug("FallbackCodec is null. Still no matching codec found for discriminator {} within discriminatorToCodec {}", discriminator, discriminatorToCodec);
            if (classToCodec.values().size() == 1) {
                codec = classToCodec.values().iterator().next();
                LOGGER.debug("Found single possible codec {} for type {}", codec, getEncoderClass());
            }
            else {
                LOGGER.warn("Legacy handling to resolve entities in db without discriminator failed as there are (now?) more than one codecs available {}. One option is to use @DiscriminatrFallback at the legacy class or to add discriminators to the entities within the database. For now, skipping value.", classToCodec);
                // TODO is skipping the right way to handle this? This might lead to lost data if a read object is rewritten to the database again...
                reader.skipValue();
                return null;// todo: when switching to mongo db 3.6 an exception should be thrown instead of returning null
            }
        }
    }


    return decodeWithType(reader, decoderContext, codec);
}