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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// BookmarkCodec is responsible for encoding and decoding the BookmarkBarModel
// into JSON values. The encoded values are written to disk via the
// BookmarkService.
#ifndef CHROME_BROWSER_BOOKMARK_CODEC_H_
#include "base/basictypes.h"
class BookmarkBarModel;
class BookmarkBarNode;
class DictionaryValue;
class ListValue;
class Value;
// BookmarkCodec is responsible for encoding/decoding bookmarks into JSON
// values. BookmarkCodec is used by BookmarkService.
class BookmarkCodec {
public:
BookmarkCodec() {}
// Encodes the model to a JSON value. It's up to the caller to delete the
// returned object. This is invoked to encode the contents of the bookmark bar
// model and is currently a convenience to invoking Encode that takes the
// bookmark bar node and other folder node.
Value* Encode(BookmarkBarModel* model);
// Encodes the bookmark bar and other folders returning the JSON value. It's
// up to the caller to delete the returned object.
// This method is public for use by StarredURLDatabase in migrating the
// bookmarks out of the database.
Value* Encode(BookmarkBarNode* bookmark_bar_node,
BookmarkBarNode* other_folder_node);
// Decodes the previously encoded value to the specified model. Returns true
// on success, false otherwise. If there is an error (such as unexpected
// version) all children are removed from the bookmark bar and other folder
// nodes.
bool Decode(BookmarkBarModel* model, const Value& value);
private:
// Encodes node and all its children into a Value object and returns it.
// The caller takes ownership of the returned object.
Value* EncodeNode(BookmarkBarNode* node);
// Decodes the children of the specified node. Returns true on success.
bool DecodeChildren(BookmarkBarModel* model,
const ListValue& child_value_list,
BookmarkBarNode* parent);
// Decodes the supplied node from the supplied value. Child nodes are
// created appropriately by way of DecodeChildren. If node is NULL a new
// node is created and added to parent, otherwise node is used.
bool DecodeNode(BookmarkBarModel* model,
const DictionaryValue& value,
BookmarkBarNode* parent,
BookmarkBarNode* node);
DISALLOW_COPY_AND_ASSIGN(BookmarkCodec);
};
#endif // CHROME_BROWSER_BOOKMARK_CODEC_H_
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