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Camel MongoDB (Java Driver 3) component
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.camel.component.mongodb.converters;
import java.math.BigDecimal;
import java.util.Map;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.mongodb.BasicDBList;
import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;
import org.apache.camel.Converter;
import org.apache.camel.Exchange;
import org.apache.camel.InvalidPayloadException;
import org.apache.camel.spi.TypeConverterRegistry;
import org.bson.Document;
@Converter(generateLoader = true)
public final class MongoDbFallbackConverter {
// Jackson's ObjectMapper is thread-safe, so no need to create a pool nor synchronize access to it
private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
private MongoDbFallbackConverter() {
}
@Converter(fallback = true)
@SuppressWarnings("unchecked")
public static Object convertTo(Class> type, Exchange exchange, Object value, TypeConverterRegistry registry)
throws InvalidPayloadException {
// if the source is a string and we attempt to convert to one of the known mongodb json classes then try that
if (String.class == value.getClass()) {
if (type == DBObject.class) {
Object out = BasicDBObject.parse(value.toString());
if (out instanceof DBObject) { // condition is always true!
return out;
} else {
throw new InvalidPayloadException(exchange, type);
}
} else if (type == BasicDBList.class) {
Object out = BasicDBObject.parse(value.toString());
if (out instanceof BasicDBList) { // condition is always false
return out;
} else {
throw new InvalidPayloadException(exchange, type);
}
} else if (type == BasicDBObject.class) {
Object out = BasicDBObject.parse(value.toString());
if (out instanceof BasicDBObject) { // condition is always true
return out;
} else {
throw new InvalidPayloadException(exchange, type);
}
}
}
// okay then fallback and use jackson
if (type == DBObject.class) {
Map, ?> m = OBJECT_MAPPER.convertValue(value, Map.class);
// workaround problem with mongodb for BigDecimal should be Double
mapMongoDBBigDecimalIssue(m);
return new BasicDBObject(m);
} else if (type == Document.class) {
Map m = OBJECT_MAPPER.convertValue(value, Map.class);
// workaround problem with mongodb for BigDecimal should be Double
mapMongoDBBigDecimalIssue(m);
return new Document(m);
}
return null;
}
@SuppressWarnings("unchecked")
private static void mapMongoDBBigDecimalIssue(Map, ?> m) {
// workaround problem with mongodb for BigDecimal should be Double
for (Map.Entry entry : m.entrySet()) {
Object v = entry.getValue();
if (v instanceof BigDecimal) {
v = Double.valueOf(v.toString());
entry.setValue(v);
}
}
}
}
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