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Response.java
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// Response.java
/**
* Copyright (C) 2008 10gen 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 com.mongodb;
// Bson
import org.bson.io.Bits;
// Java
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
class Response {
Response( ServerAddress addr , DBCollection collection , InputStream in, DBDecoder decoder)
throws IOException {
_host = addr;
final byte [] b = new byte[36];
Bits.readFully(in, b);
int pos = 0;
_len = Bits.readInt(b, pos);
pos += 4;
if (_len > MAX_LENGTH) {
throw new IllegalArgumentException( "response too long: " + _len );
}
_id = Bits.readInt(b, pos);
pos += 4;
_responseTo = Bits.readInt(b, pos);
pos += 4;
_operation = Bits.readInt(b, pos);
pos += 4;
_flags = Bits.readInt(b, pos);
pos += 4;
_cursor = Bits.readLong(b, pos);
pos += 8;
_startingFrom = Bits.readInt(b, pos);
pos += 4;
_num = Bits.readInt(b, pos);
pos += 4;
final MyInputStream user = new MyInputStream( in , _len - b.length );
if ( _num < 2 )
_objects = new LinkedList<DBObject>();
else
_objects = new ArrayList<DBObject>( _num );
for ( int i=0; i < _num; i++ ){
if ( user._toGo < 5 )
throw new IOException( "should have more objects, but only " + user._toGo + " bytes left" );
// TODO: By moving to generics, you can remove these casts (and requirement to impl DBOBject).
_objects.add( decoder.decode( user, collection ) );
}
if ( user._toGo != 0 )
throw new IOException( "finished reading objects but still have: " + user._toGo + " bytes to read!' " );
if ( _num != _objects.size() )
throw new RuntimeException( "something is really broken" );
}
public int size(){
return _num;
}
public ServerAddress serverUsed() {
return _host;
}
public DBObject get( int i ){
return _objects.get( i );
}
public Iterator<DBObject> iterator(){
return _objects.iterator();
}
public boolean hasGetMore( int queryOptions ){
if ( _cursor == 0 )
return false;
if ( _num > 0 )
return true;
if ( ( queryOptions & Bytes.QUERYOPTION_TAILABLE ) == 0 )
return false;
// have a tailable cursor, it is always possible to call get more
return true;
}
public long cursor(){
return _cursor;
}
public ServerError getError(){
if ( _num != 1 )
return null;
DBObject obj = get(0);
if ( ServerError.getMsg( obj , null ) == null )
return null;
return new ServerError( obj );
}
static class MyInputStream extends InputStream {
MyInputStream( InputStream in , int max ){
_in = in;
_toGo = max;
}
public int available()
throws IOException {
return _in.available();
}
public int read()
throws IOException {
if ( _toGo <= 0 )
return -1;
int val = _in.read();
_toGo--;
return val;
}
public int read(byte[] b, int off, int len)
throws IOException {
if ( _toGo <= 0 )
return -1;
int n = _in.read(b, off, Math.min(_toGo, len));
_toGo -= n;
return n;
}
public void close(){
throw new RuntimeException( "can't close thos" );
}
final InputStream _in;
private int _toGo;
}
public String toString(){
return "flags:" + _flags + " _cursor:" + _cursor + " _startingFrom:" + _startingFrom + " _num:" + _num ;
}
final ServerAddress _host;
final int _len;
final int _id;
final int _responseTo;
final int _operation;
final int _flags;
long _cursor;
final int _startingFrom;
final int _num;
final List<DBObject> _objects;
private static final int MAX_LENGTH = ( 32 * 1024 * 1024 );
}