/*
* Copyright 2010 Google 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.google.gwt.logging.server;
import com.google.gwt.thirdparty.json.JSONArray;
import com.google.gwt.thirdparty.json.JSONException;
import com.google.gwt.thirdparty.json.JSONObject;
import java.util.logging.Level;
import java.util.logging.LogRecord;
/**
* A set of functions to convert standard JSON strings into LogRecords. The corresponding functions
* to create the JSON strings are in JsonLogRecordClientUtil.java. This class should only be used
* in server-side code since it imports c.g.g.thirdparty.json classes.
* TODO(unnurg) once there is a unified JSON GWT library, combine this with
* JsonLogRecordClientUtil.
*/
public class JsonLogRecordServerUtil {
public static LogRecord logRecordFromJson(String jsonString)
throws InvalidJsonLogRecordFormatException {
try {
JSONObject lro = new JSONObject(jsonString);
String level = lro.getString("level");
String loggerName = lro.getString("loggerName");
String msg = lro.getString("msg");
long timestamp = Long.parseLong(lro.getString("timestamp"));
Throwable thrown = JsonLogRecordThrowable.fromJsonString(lro.getString("thrown"));
LogRecord lr = new LogRecord(Level.parse(level), msg);
lr.setLoggerName(loggerName);
lr.setThrown(thrown);
lr.setMillis(timestamp);
return lr;
} catch (JSONException e) {
throw new InvalidJsonLogRecordFormatException(e);
}
}
private static class JsonLogRecordThrowable extends Throwable {
private static Throwable fromJsonString(String jsonString) throws JSONException {
if (jsonString.equals("{}")) {
return null;
}
return new JsonLogRecordThrowable(new JSONObject(jsonString));
}
private String type;
public JsonLogRecordThrowable(JSONObject t) throws JSONException {
super(t.getString("message"));
type = t.getString("type");
setStackTrace(stackTraceFromJson(t.optJSONArray("stackTrace")));
initCause(JsonLogRecordThrowable.fromJsonString(t.getString("cause")));
}
private StackTraceElement[] stackTraceFromJson(JSONArray st) throws JSONException {
if (st == null || st.length() <= 0) {
return new StackTraceElement[0];
}
StackTraceElement[] stackTrace = new StackTraceElement[st.length()];
for (int i = 0; i < st.length(); i++) {
stackTrace[i] = stackTraceElementFromJson(st.getString(i));
}
return stackTrace;
}
private StackTraceElement stackTraceElementFromJson(String jsonString) throws JSONException {
JSONObject ste = new JSONObject(jsonString);
String className = ste.getString("className");
String fileName = ste.getString("fileName");
String methodName = ste.getString("methodName");
int lineNumber = Integer.parseInt(ste.getString("lineNumber"));
return new StackTraceElement(className, methodName, fileName, lineNumber);
}
@Override
public String toString() {
return getMessage() != null ? type + ": " + getMessage() : type;
}
}
}