/**
* 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.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.Map;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;
import com.mongodb.util.JSON;
import com.mongodb.util.JSONCallback;
import org.apache.camel.Converter;
import org.apache.camel.Exchange;
import org.apache.camel.converter.IOConverter;
import org.apache.camel.util.IOHelper;
import org.bson.BSONCallback;
import org.bson.BasicBSONDecoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Converter
public final class MongoDbBasicConverters {
private static final Logger LOG = LoggerFactory.getLogger(MongoDbBasicConverters.class);
// 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 MongoDbBasicConverters() {
}
@Converter
public static DBObject fromMapToDBObject(Map<?, ?> map) {
return new BasicDBObject(map);
}
@Converter
public static Map<String, Object> fromBasicDBObjectToMap(BasicDBObject basicDbObject) {
return basicDbObject;
}
@Converter
public static DBObject fromStringToDBObject(String s) {
DBObject answer = null;
try {
answer = (DBObject) JSON.parse(s);
} catch (Exception e) {
LOG.warn("String -> DBObject conversion selected, but the following exception occurred. Returning null.", e);
}
return answer;
}
@Converter
public static DBObject fromFileToDBObject(File f, Exchange exchange) throws FileNotFoundException {
return fromInputStreamToDBObject(new FileInputStream(f), exchange);
}
@Converter
public static DBObject fromInputStreamToDBObject(InputStream is, Exchange exchange) {
DBObject answer = null;
try {
byte[] input = IOConverter.toBytes(is);
if (isBson(input)) {
BSONCallback callback = new JSONCallback();
new BasicBSONDecoder().decode(input, callback);
answer = (DBObject) callback.get();
} else {
answer = (DBObject) JSON.parse(IOConverter.toString(input, exchange));
}
} catch (Exception e) {
LOG.warn("String -> DBObject conversion selected, but the following exception occurred. Returning null.", e);
} finally {
// we need to make sure to close the input stream
IOHelper.close(is, "InputStream", LOG);
}
return answer;
}
/**
* If the input starts with any number of whitespace characters and then a '{' character, we
* assume it is JSON rather than BSON. There are probably no useful BSON blobs that fit this pattern
*/
private static boolean isBson(byte[] input) {
int i = 0;
while (i < input.length) {
if (input[i] == '{') {
return false;
} else if (!Character.isWhitespace(input[i])) {
return true;
}
}
return true;
}
@Converter
public static DBObject fromAnyObjectToDBObject(Object value) {
BasicDBObject answer;
try {
Map<?, ?> m = OBJECT_MAPPER.convertValue(value, Map.class);
answer = new BasicDBObject(m);
} catch (Exception e) {
LOG.warn("Conversion has fallen back to generic Object -> DBObject, but unable to convert type {}. Returning null.",
value.getClass().getCanonicalName());
return null;
}
return answer;
}
}