protected URL writeConfig(ConfigData configuration, String fileName) throws Exception {
File configFile = new File(configDirectory, fileName);
File backupFile = new File(configDirectory, fileName + ".bak");
ConfigLogImplementation.logMethods.info("Writing configuration file at " + configFile);
checkConfigDirectoryWritable();
checkConfigFileWritableIfExists(configFile);
checkConfigFileWritableIfExists(backupFile);
File tempConfigFile = null;
FileOutputStream fos = null;
try {
ConfigLogImplementation.logMethods.debug("About to create temp file");
tempConfigFile = File.createTempFile("tempConfig", "." + extension, configDirectory);
tempConfigFile.deleteOnExit();
ConfigLogImplementation.logMethods.debug("About to write: " + tempConfigFile);
try {
fos = new FileOutputStream(tempConfigFile);
writeConfigToStream(fos, configuration.getSerializedConfig(), configuration.getVersion());
} finally {
if (fos != null) {
try {
fos.close();
} catch (Exception e) {
ConfigLogImplementation.logMethods.error(
"Failed to close out file stream to temp file " + tempConfigFile.getPath(), e);
}
}
}
ConfigLogImplementation.logMethods.debug("Written: " + tempConfigFile);
if (backupFile.exists()) {
ConfigLogImplementation.logMethods.debug("About to delete " + backupFile);
boolean deleted = backupFile.delete();
if (deleted) {
ConfigLogImplementation.logMethods.debug("Deleted " + backupFile);
} else {
ConfigLogImplementation.logMethods.warn("Failed to delete " + backupFile);
}
}
if (configFile.exists()) {
ConfigLogImplementation.logMethods.debug(
"About to rename old config: " + configFile + " to " + backupFile);
if (!configFile.renameTo(backupFile)) {
throw new IOException(
"Unable to rename old config: " + configFile + " to " + backupFile);
}
}
ConfigLogImplementation.logMethods.debug(
"About to rename temp config: " + tempConfigFile + " to " + configFile);
if (!tempConfigFile.renameTo(configFile)) {
throw new IOException(
"Unable to rename temp config: " + tempConfigFile + " to new config: " + configFile);
}
} catch (IOException e) {
ConfigLogImplementation.logMethods.error("Unable to save config: " + configFile, e);
throw new ConfigManagerException("Unable to save config", e);
}
return configFile.toURI().toURL();
}
