public void visit(RandomAccessFile file) throws IOException {
if (!FSImageUtil.checkFileFormat(file)) {
throw new IOException("Unrecognized FSImage");
}
FileSummary summary = FSImageUtil.loadSummary(file);
FileInputStream fin = null;
try {
fin = new FileInputStream(file.getFD());
ArrayList<FileSummary.Section> sections = Lists.newArrayList(summary
.getSectionsList());
Collections.sort(sections, new Comparator<FileSummary.Section>() {
@Override
public int compare(FileSummary.Section s1, FileSummary.Section s2) {
SectionName n1 = SectionName.fromString(s1.getName());
SectionName n2 = SectionName.fromString(s2.getName());
if (n1 == null) {
return n2 == null ? 0 : -1;
} else if (n2 == null) {
return -1;
} else {
return n1.ordinal() - n2.ordinal();
}
}
});
for (FileSummary.Section s : sections) {
fin.getChannel().position(s.getOffset());
InputStream is = FSImageUtil.wrapInputStreamForCompression(conf,
summary.getCodec(), new BufferedInputStream(new LimitInputStream(
fin, s.getLength())));
switch (SectionName.fromString(s.getName())) {
case STRING_TABLE:
loadStringTable(is);