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org.bson.codecs.pojo.PojoCodecImpl Maven / Gradle / Ivy
/*
* Copyright 2008-present MongoDB, Inc.
*
* 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.
*/
package org.bson.codecs.pojo;
import org.bson.BsonDocument;
import org.bson.BsonDocumentReader;
import org.bson.BsonDocumentWrapper;
import org.bson.BsonInvalidOperationException;
import org.bson.BsonReader;
import org.bson.BsonReaderMark;
import org.bson.BsonType;
import org.bson.BsonValue;
import org.bson.BsonWriter;
import org.bson.codecs.BsonValueCodec;
import org.bson.codecs.Codec;
import org.bson.codecs.DecoderContext;
import org.bson.codecs.Encoder;
import org.bson.codecs.EncoderContext;
import org.bson.codecs.configuration.CodecConfigurationException;
import org.bson.codecs.configuration.CodecRegistry;
import org.bson.diagnostics.Logger;
import org.bson.diagnostics.Loggers;
import javax.annotation.Nullable;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.function.Supplier;
import static java.lang.String.format;
final class PojoCodecImpl extends PojoCodec {
private static final Logger LOGGER = Loggers.getLogger("PojoCodec");
private static final Codec BSON_VALUE_CODEC = new BsonValueCodec();
private final ClassModel classModel;
private final CodecRegistry registry;
private final PropertyCodecRegistry propertyCodecRegistry;
private final DiscriminatorLookup discriminatorLookup;
PojoCodecImpl(final ClassModel classModel, final CodecRegistry codecRegistry,
final List propertyCodecProviders, final DiscriminatorLookup discriminatorLookup) {
this.classModel = classModel;
this.registry = codecRegistry;
this.discriminatorLookup = discriminatorLookup;
this.propertyCodecRegistry = new PropertyCodecRegistryImpl(this, registry, propertyCodecProviders);
specialize();
}
PojoCodecImpl(final ClassModel classModel, final CodecRegistry codecRegistry,
final PropertyCodecRegistry propertyCodecRegistry, final DiscriminatorLookup discriminatorLookup) {
this.classModel = classModel;
this.registry = codecRegistry;
this.discriminatorLookup = discriminatorLookup;
this.propertyCodecRegistry = propertyCodecRegistry;
specialize();
}
@SuppressWarnings("unchecked")
@Override
public void encode(final BsonWriter writer, final T value, final EncoderContext encoderContext) {
if (areEquivalentTypes(value.getClass(), classModel.getType())) {
writer.writeStartDocument();
encodeIdProperty(writer, value, encoderContext, classModel.getIdPropertyModelHolder());
if (classModel.useDiscriminator()) {
writer.writeString(classModel.getDiscriminatorKey(), classModel.getDiscriminator());
}
for (PropertyModel propertyModel : classModel.getPropertyModels()) {
if (propertyModel.equals(classModel.getIdPropertyModel())) {
continue;
}
encodeProperty(writer, value, encoderContext, propertyModel);
}
writer.writeEndDocument();
} else {
((Codec) registry.get(value.getClass())).encode(writer, value, encoderContext);
}
}
@Override
public T decode(final BsonReader reader, final DecoderContext decoderContext) {
if (decoderContext.hasCheckedDiscriminator()) {
InstanceCreator instanceCreator = classModel.getInstanceCreator();
decodeProperties(reader, decoderContext, instanceCreator);
return instanceCreator.getInstance();
} else {
return getCodecFromDocument(reader, classModel.useDiscriminator(), classModel.getDiscriminatorKey(), registry,
discriminatorLookup, this, classModel.getName())
.decode(reader, DecoderContext.builder().checkedDiscriminator(true).build());
}
}
@Override
public Class getEncoderClass() {
return classModel.getType();
}
@Override
public String toString() {
return format("PojoCodec<%s>", classModel);
}
ClassModel getClassModel() {
return classModel;
}
private void encodeIdProperty(final BsonWriter writer, final T instance, final EncoderContext encoderContext,
final IdPropertyModelHolder propertyModelHolder) {
if (propertyModelHolder.getPropertyModel() != null) {
if (propertyModelHolder.getIdGenerator() == null) {
encodeProperty(writer, instance, encoderContext, propertyModelHolder.getPropertyModel());
} else {
S id = propertyModelHolder.getPropertyModel().getPropertyAccessor().get(instance);
if (id == null && encoderContext.isEncodingCollectibleDocument()) {
id = propertyModelHolder.getIdGenerator().generate();
try {
propertyModelHolder.getPropertyModel().getPropertyAccessor().set(instance, id);
} catch (Exception e) {
// ignore
}
}
encodeValue(writer, encoderContext, propertyModelHolder.getPropertyModel(), id);
}
}
}
private void encodeProperty(final BsonWriter writer, final T instance, final EncoderContext encoderContext,
final PropertyModel propertyModel) {
if (propertyModel != null && propertyModel.isReadable()) {
S propertyValue = propertyModel.getPropertyAccessor().get(instance);
encodeValue(writer, encoderContext, propertyModel, propertyValue);
}
}
@SuppressWarnings("unchecked")
private void encodeValue(final BsonWriter writer, final EncoderContext encoderContext, final PropertyModel propertyModel,
final S propertyValue) {
if (propertyModel.shouldSerialize(propertyValue)) {
try {
if (propertyModel.getPropertySerialization().inline()) {
if (propertyValue != null) {
new BsonDocumentWrapper<>(propertyValue, propertyModel.getCachedCodec()).forEach((k, v) -> {
writer.writeName(k);
encoderContext.encodeWithChildContext((Encoder) registry.get(v.getClass()), writer, v);
});
}
} else {
writer.writeName(propertyModel.getReadName());
if (propertyValue == null) {
writer.writeNull();
} else {
encoderContext.encodeWithChildContext(propertyModel.getCachedCodec(), writer, propertyValue);
}
}
} catch (CodecConfigurationException e) {
throw new CodecConfigurationException(format("Failed to encode '%s'. Encoding '%s' errored with: %s",
classModel.getName(), propertyModel.getReadName(), e.getMessage()), e);
}
}
}
private void decodeProperties(final BsonReader reader, final DecoderContext decoderContext, final InstanceCreator instanceCreator) {
PropertyModel inlineElementsPropertyModel = classModel.getPropertyModels()
.stream()
.filter(p -> p.getPropertySerialization().inline())
.findFirst()
.orElse(null);
BsonDocument extraElements = inlineElementsPropertyModel == null ? null : new BsonDocument();
reader.readStartDocument();
while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) {
String name = reader.readName();
if (classModel.useDiscriminator() && classModel.getDiscriminatorKey().equals(name)) {
reader.readString();
} else {
decodePropertyModel(reader, decoderContext, instanceCreator, name, getPropertyModelByWriteName(classModel, name), extraElements);
}
}
reader.readEndDocument();
setPropertyValueBsonExtraElements(instanceCreator, extraElements, inlineElementsPropertyModel);
}
private void decodePropertyModel(final BsonReader reader, final DecoderContext decoderContext,
final InstanceCreator instanceCreator, final String name,
final PropertyModel propertyModel, @Nullable final BsonDocument extraElements) {
if (propertyModel != null) {
setPropertyValue(instanceCreator, () -> {
S value = null;
if (reader.getCurrentBsonType() == BsonType.NULL) {
reader.readNull();
} else {
Codec codec = propertyModel.getCachedCodec();
if (codec == null) {
throw new CodecConfigurationException(format("Missing codec in '%s' for '%s'",
classModel.getName(), propertyModel.getName()));
}
value = decoderContext.decodeWithChildContext(codec, reader);
}
return value;
}, propertyModel);
} else if (extraElements == null) {
if (LOGGER.isTraceEnabled()) {
LOGGER.trace(format("Found property not present in the ClassModel: %s", name));
}
reader.skipValue();
} else {
try {
extraElements.append(name, decoderContext.decodeWithChildContext(BSON_VALUE_CODEC, reader));
} catch (CodecConfigurationException e) {
throw new CodecConfigurationException(format("Failed to decode '%s'. Decoding '%s' errored with: %s",
classModel.getName(), name, e.getMessage()), e);
}
}
}
private void setPropertyValue(final InstanceCreator instanceCreator, final Supplier valueSupplier,
final PropertyModel propertyModel) {
try {
instanceCreator.set(valueSupplier.get(), propertyModel);
} catch (BsonInvalidOperationException | CodecConfigurationException e) {
throw new CodecConfigurationException(format("Failed to decode '%s'. Decoding '%s' errored with: %s",
classModel.getName(), propertyModel.getName(), e.getMessage()), e);
}
}
private void setPropertyValueBsonExtraElements(final InstanceCreator instanceCreator, @Nullable final BsonDocument extraElements,
final PropertyModel inlineElementsPropertyModel) {
if (extraElements != null
&& !extraElements.isEmpty()
&& inlineElementsPropertyModel != null
&& inlineElementsPropertyModel.isWritable()) {
setPropertyValue(instanceCreator, () ->
inlineElementsPropertyModel.getCachedCodec()
.decode(new BsonDocumentReader(extraElements), DecoderContext.builder().build()),
inlineElementsPropertyModel);
}
}
private void specialize() {
classModel.getPropertyModels().forEach(this::cachePropertyModelCodec);
}
private void cachePropertyModelCodec(final PropertyModel propertyModel) {
if (propertyModel.getCachedCodec() == null) {
Codec codec = propertyModel.getCodec() != null ? propertyModel.getCodec()
: new LazyPropertyModelCodec<>(propertyModel, registry, propertyCodecRegistry);
propertyModel.cachedCodec(codec);
}
}
private boolean areEquivalentTypes(final Class t1, final Class t2) {
if (t1.equals(t2)) {
return true;
} else if (Collection.class.isAssignableFrom(t1) && Collection.class.isAssignableFrom(t2)) {
return true;
} else if (Map.class.isAssignableFrom(t1) && Map.class.isAssignableFrom(t2)) {
return true;
}
return false;
}
@SuppressWarnings("unchecked")
@Nullable
static Codec getCodecFromDocument(final BsonReader reader, final boolean useDiscriminator, final String discriminatorKey,
final CodecRegistry registry, final DiscriminatorLookup discriminatorLookup, @Nullable final Codec defaultCodec,
final String simpleClassName) {
Codec codec = defaultCodec;
if (useDiscriminator) {
BsonReaderMark mark = reader.getMark();
reader.readStartDocument();
boolean discriminatorKeyFound = false;
while (!discriminatorKeyFound && reader.readBsonType() != BsonType.END_OF_DOCUMENT) {
String name = reader.readName();
if (discriminatorKey.equals(name)) {
discriminatorKeyFound = true;
try {
Class discriminatorClass = discriminatorLookup.lookup(reader.readString());
if (codec == null || !codec.getEncoderClass().equals(discriminatorClass)) {
codec = (Codec) registry.get(discriminatorClass);
}
} catch (Exception e) {
throw new CodecConfigurationException(format("Failed to decode '%s'. Decoding errored with: %s",
simpleClassName, e.getMessage()), e);
}
} else {
reader.skipValue();
}
}
mark.reset();
}
return codec;
}
private PropertyModel getPropertyModelByWriteName(final ClassModel classModel, final String readName) {
for (PropertyModel propertyModel : classModel.getPropertyModels()) {
if (propertyModel.isWritable() && propertyModel.getWriteName().equals(readName)) {
return propertyModel;
}
}
return null;
}
@Override
DiscriminatorLookup getDiscriminatorLookup() {
return discriminatorLookup;
}
}
