/*
 * 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.
 */

#include "net/instaweb/http/public/http_value_writer.h"

#include "net/instaweb/http/public/http_cache.h"
#include "net/instaweb/http/public/http_value.h"

namespace net_instaweb {

void HTTPValueWriter::SetHeaders(ResponseHeaders* headers) {
  if (cache_->IsCacheableContentLength(headers)) {
    value_->SetHeaders(headers);
  } else {
    has_buffered_ = false;
    value_->Clear();
  }
}

bool HTTPValueWriter::Write(const StringPiece& str, MessageHandler* handler) {
  if (has_buffered_ &&
      cache_->IsCacheableBodySize(str.size() + value_->contents_size())) {
    // IsCacheableContentLength is only able to detect if a response is
    // of cacheable size when the response has content type header. If we
    // receive the response chunked, then we need to buffer up before
    // discovering if the response is uncacheable.
    return value_->Write(str, handler);
  }
  has_buffered_ = false;
  value_->Clear();
  return false;
}

bool HTTPValueWriter::CheckCanCacheElseClear(ResponseHeaders* headers) {
  if (!cache_->IsCacheableContentLength(headers)) {
    has_buffered_ = false;
    value_->Clear();
  }
  return has_buffered_;
}

bool HTTPValueWriter::CanCacheContent(const StringPiece& str) const {
  return cache_->IsCacheableBodySize(str.size() + value_->contents_size());
}

}  // namespace net_instaweb
