org.bson.LazyBSONDecoder Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of mongo-java-driver Show documentation
Show all versions of mongo-java-driver Show documentation
The MongoDB Java Driver uber-artifact, containing mongodb-driver, mongodb-driver-core, and bson
/*
* Copyright (c) 2008-2014 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;
import org.bson.io.Bits;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* implementation of BSONDecoder that creates LazyBSONObject instances
*/
public class LazyBSONDecoder implements BSONDecoder {
@Override
public BSONObject readObject(byte[] b) {
try {
return readObject( new ByteArrayInputStream( b ) );
}
catch ( IOException ioe ){
throw new BSONException( "should be impossible" , ioe );
}
}
@Override
public BSONObject readObject(InputStream in) throws IOException {
BSONCallback c = new LazyBSONCallback();
decode( in , c );
return (BSONObject)c.get();
}
@Override
public int decode(byte[] b, BSONCallback callback) {
try {
return decode( new ByteArrayInputStream( b ), callback );
}
catch ( IOException ioe ) {
throw new BSONException( "should be impossible" , ioe );
}
}
@Override
public int decode(InputStream in, BSONCallback callback) throws IOException {
byte[] objSizeBuffer = new byte[BYTES_IN_INTEGER];
Bits.readFully(in, objSizeBuffer, 0, BYTES_IN_INTEGER);
int objSize = Bits.readInt(objSizeBuffer);
byte[] data = new byte[objSize];
System.arraycopy(objSizeBuffer, 0, data, 0, BYTES_IN_INTEGER);
Bits.readFully(in, data, BYTES_IN_INTEGER, objSize - BYTES_IN_INTEGER);
// note that we are handing off ownership of the data byte array to the callback
callback.gotBinary(null, (byte) 0, data);
return objSize;
}
private static int BYTES_IN_INTEGER = 4;
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy