/*
* Copyright 2011-2014 the original author or authors.
*
* 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.springframework.data.mongodb.repository.support;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.regex.Pattern;
import org.springframework.data.mapping.context.MappingContext;
import org.springframework.data.mongodb.core.convert.MongoConverter;
import org.springframework.data.mongodb.core.convert.QueryMapper;
import org.springframework.data.mongodb.core.mapping.MongoPersistentEntity;
import org.springframework.data.mongodb.core.mapping.MongoPersistentProperty;
import org.springframework.util.Assert;
import com.mongodb.DBObject;
import com.mongodb.DBRef;
import com.mysema.query.mongodb.MongodbSerializer;
import com.mysema.query.types.Constant;
import com.mysema.query.types.Operation;
import com.mysema.query.types.Path;
import com.mysema.query.types.PathMetadata;
import com.mysema.query.types.PathType;
/**
* Custom {@link MongodbSerializer} to take mapping information into account when building keys for constraints.
*
* @author Oliver Gierke
* @author Christoph Strobl
*/
class SpringDataMongodbSerializer extends MongodbSerializer {
private static final String ID_KEY = "_id";
private static final Set<PathType> PATH_TYPES;
static {
Set<PathType> pathTypes = new HashSet<PathType>();
pathTypes.add(PathType.VARIABLE);
pathTypes.add(PathType.PROPERTY);
PATH_TYPES = Collections.unmodifiableSet(pathTypes);
}
private final MongoConverter converter;
private final MappingContext<? extends MongoPersistentEntity<?>, MongoPersistentProperty> mappingContext;
private final QueryMapper mapper;
/**
* Creates a new {@link SpringDataMongodbSerializer} for the given {@link MappingContext}.
*
* @param mappingContext must not be {@literal null}.
*/
public SpringDataMongodbSerializer(MongoConverter converter) {
Assert.notNull(converter, "MongoConverter must not be null!");
this.mappingContext = converter.getMappingContext();
this.converter = converter;
this.mapper = new QueryMapper(converter);
}
/*
* (non-Javadoc)
* @see com.mysema.query.mongodb.MongodbSerializer#getKeyForPath(com.mysema.query.types.Path, com.mysema.query.types.PathMetadata)
*/
@Override
protected String getKeyForPath(Path<?> expr, PathMetadata<?> metadata) {
if (!metadata.getPathType().equals(PathType.PROPERTY)) {
return super.getKeyForPath(expr, metadata);
}
Path<?> parent = metadata.getParent();
MongoPersistentEntity<?> entity = mappingContext.getPersistentEntity(parent.getType());
MongoPersistentProperty property = entity.getPersistentProperty(metadata.getName());
return property == null ? super.getKeyForPath(expr, metadata) : property.getFieldName();
}
/*
* (non-Javadoc)
* @see com.mysema.query.mongodb.MongodbSerializer#asDBObject(java.lang.String, java.lang.Object)
*/
@Override
protected DBObject asDBObject(String key, Object value) {
if (ID_KEY.equals(key)) {
return mapper.getMappedObject(super.asDBObject(key, value), null);
}
return super.asDBObject(key, value instanceof Pattern ? value : converter.convertToMongoType(value));
}
/*
* (non-Javadoc)
* @see com.mysema.query.mongodb.MongodbSerializer#isReference(com.mysema.query.types.Path)
*/
@Override
protected boolean isReference(Path<?> path) {
MongoPersistentProperty property = getPropertyFor(path);
return property == null ? false : property.isAssociation();
}
/*
* (non-Javadoc)
* @see com.mysema.query.mongodb.MongodbSerializer#asReference(java.lang.Object)
*/
@Override
protected DBRef asReference(Object constant) {
return converter.toDBRef(constant, null);
}
/*
* (non-Javadoc)
* @see com.mysema.query.mongodb.MongodbSerializer#asReference(com.mysema.query.types.Operation, int)
*/
@Override
protected DBRef asReference(Operation<?> expr, int constIndex) {
for (Object arg : expr.getArgs()) {
if (arg instanceof Path) {
MongoPersistentProperty property = getPropertyFor((Path<?>) arg);
Object constant = ((Constant<?>) expr.getArg(constIndex)).getConstant();
return converter.toDBRef(constant, property);
}
}
return super.asReference(expr, constIndex);
}
private MongoPersistentProperty getPropertyFor(Path<?> path) {
Path<?> parent = path.getMetadata().getParent();
if (parent == null || !PATH_TYPES.contains(path.getMetadata().getPathType())) {
return null;
}
MongoPersistentEntity<?> entity = mappingContext.getPersistentEntity(parent.getType());
return entity != null ? entity.getPersistentProperty(path.getMetadata().getName()) : null;
}
}