Java BsonReader.skipValue方法代码示例

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 T decode(BsonReader reader, DecoderContext decoderContext) {
    if (BsonType.STRING.equals(reader.getCurrentBsonType())) {
        String name = reader.readString();
        if (name != null) {
            try {
                return Enum.valueOf(clazz, name);
            } catch (IllegalArgumentException e) {
                LOGGER.warn("Enum value {} could not be determined for enum type {}", name, clazz, e);
            }
        }
    } else {
        LOGGER.warn("Expected {} from reader but got {}. Skipping value.", BsonType.STRING, reader.getCurrentBsonType());
        reader.skipValue();
    }
    return null;
}
 

import org.bson.BsonReader; //导入方法依赖的package包/类
public void decode(BsonReader reader, T instance, DecoderContext decoderContext) {
    LOGGER.debug("Decode field : " + getMappedFieldName() + " Signature: " + fieldTypePair.getRealType());
    if (field.getType().isPrimitive()) {
        if (reader.getCurrentBsonType() == BsonType.NULL || reader.getCurrentBsonType() == BsonType.UNDEFINED) {
            reader.skipValue();
        } else {
            primitiveType.decode(reader, instance, decoderContext, this);
        }
    } else if (codec != null) {
        if (reader.getCurrentBsonType() == BsonType.NULL ) {
            reader.readNull();
            setFieldValue(instance, null);
        }
        else if (reader.getCurrentBsonType() == BsonType.UNDEFINED) {
            reader.skipValue();
        }
        else {
            F decoded = codec.decode(reader, decoderContext);
            setFieldValue(instance, decoded);
        }
    }
}
 

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 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
default boolean checkBsonTypeAndSkipOnMisMatch(BsonReader reader) {
    if (getBsonType().equals(reader.getCurrentBsonType())) {
        return true;
    } else {
        LOGGER.warn("Expected {} from reader but got {}. Skipping value.", getBsonType(), reader.getCurrentBsonType());
        reader.skipValue();
    }
    return false;
}
 

import org.bson.BsonReader; //导入方法依赖的package包/类
@Override
default T decode(BsonReader reader, DecoderContext decoderContext) {
    T newInstance;
    if (reader.getCurrentBsonType() == null || reader.getCurrentBsonType() == BsonType.DOCUMENT) {
        reader.readStartDocument();
        newInstance = decodeFields(reader, decoderContext, newInstance());
        reader.readEndDocument();
        return newInstance;
    } else {
        LOGGER.error("Expected to read document but reader is in state {}. Skipping value!", reader.getCurrentBsonType());
        reader.skipValue();
        return null;
    }
}
 

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
private Object decodeDimension(BsonReader reader, DecoderContext decoderContext, Class<?> componentType) {
    Object array = null;
    boolean decodeLastDimension;
    Class<?> childComponentType = componentType.getComponentType();
    decodeLastDimension = !childComponentType.isArray();

    if (childComponentType == byte.class) {
        array = arrayElementCodec.decode(reader, decoderContext);
    } else if (BsonType.ARRAY.equals(reader.getCurrentBsonType())) {
        reader.readStartArray();
        if (decodeLastDimension) {
            if (isPrimitive) {
                array = arrayElementCodec.decode(reader, decoderContext);
            } else {
                List list = new ArrayList();
                while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) {
                    list.add(arrayElementCodec.decode(reader, decoderContext));
                }
                array = Array.newInstance(childComponentType, list.size());
                for (int i = 0; i < list.size(); i++) {
                    Array.set(array, i, list.get(i));
                }
            }
        } else {
            List arrayList = new ArrayList();
            while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) {
                Object decoded = decodeDimension(reader, decoderContext, childComponentType);
                arrayList.add(decoded);
            }

            array = Array.newInstance(childComponentType, arrayList.size());
            for (int i = 0; i < arrayList.size(); i++) {
                Array.set(array, i, arrayList.get(i));
            }
        }
        reader.readEndArray();
    } else {
        LOGGER.warn("Expected {} from reader but got {}. Skipping value.", BsonType.ARRAY, reader.getCurrentBsonType());
        reader.skipValue();
    }
    return array;
}
 

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);
}