/*
* Copyright 2011 VZ Netzwerke Ltd
* Copyright 2014 devbliss GmbH
*
* 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.mongojack.internal.stream;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.bson.BSONCallback;
import org.bson.BSONObject;
import org.mongojack.JacksonDBCollection;
import com.fasterxml.jackson.core.io.IOContext;
import com.fasterxml.jackson.core.util.BufferRecycler;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.mongodb.DBCallback;
import com.mongodb.DBCollection;
import com.mongodb.DBDecoder;
import com.mongodb.DBObject;
/**
* DB decoder that decodes the database stream using Jackson and bson4jackson
*
* @author James Roper
* @since 1.1.2
*/
public class JacksonDBDecoder<T> implements DBDecoder {
private final JacksonDBCollection<T, ?> dbCollection;
private final ObjectMapper objectMapper;
private final JavaType type;
public JacksonDBDecoder(JacksonDBCollection<T, ?> dbCollection,
ObjectMapper objectMapper, JavaType type) {
this.dbCollection = dbCollection;
this.objectMapper = objectMapper;
this.type = type;
}
@Override
public DBCallback getDBCallback(DBCollection collection) {
throw new UnsupportedOperationException(
"JacksonDBDecoder does not support callback style decoding");
}
@Override
public DBObject decode(byte[] b, DBCollection collection) {
try {
return decode(new ByteArrayInputStream(b), collection);
} catch (IOException e) {
// Not possible
throw new RuntimeException(
"IOException encountered while reading from a byte array input stream",
e);
}
}
@Override
public DBObject decode(InputStream in, DBCollection collection)
throws IOException {
JacksonDBObject<T> decoded = new JacksonDBObject<T>();
decoded.setObject((T) objectMapper.readValue(new DBDecoderBsonParser(
new IOContext(new BufferRecycler(), in, false), 0, in, decoded,
dbCollection, objectMapper), type));
return decoded;
}
@Override
public BSONObject readObject(byte[] b) {
return decode(b, (DBCollection) null);
}
@Override
public BSONObject readObject(InputStream in) throws IOException {
return decode(in, (DBCollection) null);
}
@Override
public int decode(byte[] b, BSONCallback callback) {
throw new UnsupportedOperationException(
"JacksonDBDecoder does not support callback style decoding");
}
@Override
public int decode(InputStream in, BSONCallback callback) throws IOException {
throw new UnsupportedOperationException(
"JacksonDBDecoder does not support callback style decoding");
}
}