/**
* Fetches the last modification time of the resource
*
* @param resource Resource object we are finding timestamp of
* @param operation string for logging, indicating caller's intention
* @return timestamp as long
*/
private long readLastModified(final Resource resource, final String operation) {
long timeStamp = 0;
/* get the template name from the resource */
String name = resource.getName();
if (name == null || name.length() == 0) {
String msg = "DataSourceResourceLoader: Template name was empty or null";
Logger.error(this, msg);
throw new NullPointerException(msg);
} else {
Connection conn = null;
ResultSet rs = null;
PreparedStatement ps = null;
try {
conn = openDbConnection();
ps = getStatement(conn, timestampColumn, name);
rs = ps.executeQuery();
if (rs.next()) {
Timestamp ts = rs.getTimestamp(timestampColumn);
timeStamp = ts != null ? ts.getTime() : 0;
} else {
String msg =
"DataSourceResourceLoader: could not find resource " + name + " while " + operation;
Logger.error(this, msg);
throw new ResourceNotFoundException(msg);
}
} catch (SQLException sqle) {
String msg =
"DataSourceResourceLoader: database problem while "
+ operation
+ " of '"
+ name
+ "': ";
Logger.error(this, msg, sqle);
throw ExceptionUtils.createRuntimeException(msg, sqle);
} catch (NamingException ne) {
String msg =
"DataSourceResourceLoader: database problem while "
+ operation
+ " of '"
+ name
+ "': ";
Logger.error(this, msg, ne);
throw ExceptionUtils.createRuntimeException(msg, ne);
} finally {
closeResultSet(rs);
closeStatement(ps);
closeDbConnection(conn);
}
}
return timeStamp;
}
/**
* Get an InputStream so that the Runtime can build a template with it.
*
* @param name name of template to get
* @return InputStream containing the template
* @throws ResourceNotFoundException if template not found in classpath.
*/
public InputStream getResourceStream(String name) throws ResourceNotFoundException {
InputStream result = null;
if (StringUtils.isEmpty(name)) {
throw new ResourceNotFoundException("No template name provided");
}
/**
* look for resource in thread classloader first (e.g. WEB-INF\lib in a servlet container) then
* fall back to the system classloader.
*/
try {
result = ClassUtils.getResourceAsStream(getClass(), name);
} catch (Exception fnfe) {
throw (ResourceNotFoundException)
ExceptionUtils.createWithCause(
ResourceNotFoundException.class, "problem with template: " + name, fnfe);
}
if (result == null) {
String msg = "ClasspathResourceLoader Error: cannot find resource " + name;
throw new ResourceNotFoundException(msg);
}
return result;
}