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/*
* 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.codecs.configuration.CodecConfigurationException;
import java.util.Collection;
import java.util.Map;
import static java.lang.String.format;
final class ConventionUseGettersAsSettersImpl implements Convention {
@Override
public void apply(final ClassModelBuilder classModelBuilder) {
for (PropertyModelBuilder propertyModelBuilder : classModelBuilder.getPropertyModelBuilders()) {
if (!(propertyModelBuilder.getPropertyAccessor() instanceof PropertyAccessorImpl)) {
throw new CodecConfigurationException(format("The USE_GETTER_AS_SETTER_CONVENTION is not compatible with "
+ "propertyModelBuilder instance that have custom implementations of org.bson.codecs.pojo.PropertyAccessor: %s",
propertyModelBuilder.getPropertyAccessor().getClass().getName()));
}
PropertyAccessorImpl defaultAccessor = (PropertyAccessorImpl) propertyModelBuilder.getPropertyAccessor();
PropertyMetadata propertyMetaData = defaultAccessor.getPropertyMetadata();
if (!propertyMetaData.isDeserializable() && propertyMetaData.isSerializable()
&& isMapOrCollection(propertyMetaData.getTypeData().getType())) {
setPropertyAccessor(propertyModelBuilder);
}
}
}
private boolean isMapOrCollection(final Class clazz) {
return Collection.class.isAssignableFrom(clazz) || Map.class.isAssignableFrom(clazz);
}
@SuppressWarnings("unchecked")
private void setPropertyAccessor(final PropertyModelBuilder propertyModelBuilder) {
propertyModelBuilder.propertyAccessor(new PrivatePropertyAccessor(
(PropertyAccessorImpl) propertyModelBuilder.getPropertyAccessor()));
}
@SuppressWarnings({"rawtypes", "unchecked"})
private static final class PrivatePropertyAccessor implements PropertyAccessor {
private final PropertyAccessorImpl wrapped;
private PrivatePropertyAccessor(final PropertyAccessorImpl wrapped) {
this.wrapped = wrapped;
}
@Override
public T get(final S instance) {
return wrapped.get(instance);
}
@Override
public void set(final S instance, final T value) {
if (value instanceof Collection) {
mutateCollection(instance, (Collection) value);
} else if (value instanceof Map) {
mutateMap(instance, (Map) value);
} else {
throwCodecConfigurationException(format("Unexpected type: '%s'", value.getClass()), null);
}
}
private void mutateCollection(final S instance, final Collection value) {
T originalCollection = get(instance);
Collection collection = ((Collection) originalCollection);
if (collection == null) {
throwCodecConfigurationException("The getter returned null.", null);
} else if (!collection.isEmpty()) {
throwCodecConfigurationException("The getter returned a non empty collection.", null);
} else {
try {
collection.addAll(value);
} catch (Exception e) {
throwCodecConfigurationException("collection#addAll failed.", e);
}
}
}
private void mutateMap(final S instance, final Map value) {
T originalMap = get(instance);
Map map = ((Map) originalMap);
if (map == null) {
throwCodecConfigurationException("The getter returned null.", null);
} else if (!map.isEmpty()) {
throwCodecConfigurationException("The getter returned a non empty map.", null);
} else {
try {
map.putAll(value);
} catch (Exception e) {
throwCodecConfigurationException("map#putAll failed.", e);
}
}
}
private void throwCodecConfigurationException(final String reason, final Exception cause) {
throw new CodecConfigurationException(format("Cannot use getter in '%s' to set '%s'. %s",
wrapped.getPropertyMetadata().getDeclaringClassName(), wrapped.getPropertyMetadata().getName(), reason), cause);
}
}
}