/*
* Copyright (c) 2010, SQL Power Group Inc.
*
* This file is part of SQL Power Library.
*
* SQL Power Library is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* SQL Power Library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package ca.sqlpower.diff;
import java.util.ArrayList;
import java.util.List;
import org.apache.log4j.Logger;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
/**
* This class is used to convert DiffChunks to and from JSON-formatted strings.
* It is simple because it only the name properties of the data in the chunks
* (and physical name for SQLTable)
*
* XXX Add reflection to decode method so that it is not limited to SQLTable, SQLColumn, and SQLRelationship
*/
public class SimpleDiffChunkJSONConverter {
public static final Logger logger = Logger.getLogger(SimpleDiffChunkJSONConverter.class);
/**
* Converts a list of DiffChunk to a JSONArray string.
* @param chunks
* @throws JSONException
*/
public static String encode(List<DiffChunk<DiffInfo>> chunks) throws JSONException {
JSONArray jsonArray = new JSONArray();
for (DiffChunk<DiffInfo> chunk : chunks) {
JSONObject object = new JSONObject();
object.put("type", chunk.getType().toString());
JSONArray changes = new JSONArray();
for (PropertyChange change : chunk.getPropertyChanges()) {
JSONObject json = new JSONObject();
json.put("propertyName", change.getPropertyName());
json.put("oldValue", change.getOldValue());
json.put("newValue", change.getNewValue());
changes.put(json);
}
object.put("changes", changes);
JSONObject info = new JSONObject();
info.put("dataType", chunk.getData().getDataType());
info.put("name", chunk.getData().getName());
info.put("depth", chunk.getData().getDepth());
object.put("info", info);
jsonArray.put(object);
}
return jsonArray.toString();
}
/**
* Converts a JSONArray string into a list of DiffChunk objects.
* @param message
* @throws JSONException
*/
public static List<DiffChunk<DiffInfo>> decode(String message) throws JSONException {
List<DiffChunk<DiffInfo>> diffChunks = new ArrayList<DiffChunk<DiffInfo>>();
logger.debug(message);
JSONArray jsonArray = new JSONArray(message);
logger.debug(jsonArray.toString());
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject object = jsonArray.getJSONObject(i);
JSONObject jsonInfo = object.getJSONObject("info");
DiffInfo info = new DiffInfo(jsonInfo.getString("dataType"), jsonInfo.getString("name"));
info.setDepth(jsonInfo.getInt("depth"));
DiffType type = DiffType.valueOf(object.getString("type"));
DiffChunk<DiffInfo> chunk = new DiffChunk<DiffInfo>(info, type);
JSONArray changes = object.getJSONArray("changes");
for (int j = 0; j < changes.length(); j++) {
JSONObject change = changes.getJSONObject(j);
chunk.addPropertyChange(new PropertyChange(change.getString("propertyName"),
change.getString("oldValue"), change.getString("newValue")));
}
diffChunks.add(chunk);
}
return diffChunks;
}
}