pagespeed/kernel/base/null_writer.h

/*
 * 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.
 */


#ifndef PAGESPEED_KERNEL_BASE_NULL_WRITER_H_
#define PAGESPEED_KERNEL_BASE_NULL_WRITER_H_

#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/kernel/base/writer.h"

namespace net_instaweb {
class MessageHandler;

// A writer that silently eats the bytes.  This can be used, for
// example, with writers is designed to cascade to another one, such
// as CountingWriter.  If you just want to count the bytes and don't
// want to store them, you can pass a NullWriter to a CountingWriter's
// constructor.
class NullWriter : public Writer {
 public:
  explicit NullWriter() { }
  virtual ~NullWriter();
  virtual bool Write(const StringPiece& str, MessageHandler* handler);
  virtual bool Flush(MessageHandler* handler);
};

}  // namespace net_instaweb

#endif  // PAGESPEED_KERNEL_BASE_NULL_WRITER_H_