/**
* Pre-parses a file for some information not available from the FindBugs parser. Creates a
* mapping of FindBugs warnings to messages. A bug is represented by its unique hash code. Also
* obtains original categories for bug types.
*
* @param file the FindBugs XML file
* @return the map of warning messages
* @throws SAXException if the file contains no valid XML
* @throws IOException signals that an I/O exception has occurred.
*/
List<XmlBugInstance> preParse(final InputStream file) throws SAXException, IOException {
Digester digester = new Digester();
digester.setValidating(false);
digester.setClassLoader(FindBugsParser.class.getClassLoader());
String rootXPath = "BugCollection/BugInstance";
digester.addObjectCreate(rootXPath, XmlBugInstance.class);
digester.addSetProperties(rootXPath);
String fileXPath = rootXPath + "/LongMessage";
digester.addCallMethod(fileXPath, "setMessage", 0);
digester.addSetNext(rootXPath, "add", Object.class.getName());
ArrayList<XmlBugInstance> bugs = new ArrayList<XmlBugInstance>();
digester.push(bugs);
digester.parse(file);
return bugs;
}
