@Override
public DecodeQualification getDecodeQualification(Object input) {
String filename = new File(input.toString()).getName();
if (!isLandsatMSSFilename(filename)
&& !isLandsat4Filename(filename)
&& !isLandsat5Filename(filename)
&& !isLandsat7Filename(filename)
&& !isLandsat8Filename(filename)
&& !isLandsat5LegacyFilename(filename)
&& !isLandsat7LegacyFilename(filename)) {
return DecodeQualification.UNABLE;
}
VirtualDir virtualDir;
try {
virtualDir = getInput(input);
} catch (IOException e) {
return DecodeQualification.UNABLE;
}
if (virtualDir == null) {
return DecodeQualification.UNABLE;
}
String[] allFiles;
try {
allFiles = virtualDir.listAllFiles();
if (allFiles == null || allFiles.length == 0) {
return DecodeQualification.UNABLE;
}
} catch (IOException e) {
return DecodeQualification.UNABLE;
}
for (String filePath : allFiles) {
try {
if (isMetadataFilename(new File(filePath).getName())) {
InputStream inputStream = virtualDir.getInputStream(filePath);
if (isMetadataFile(inputStream)) {
return DecodeQualification.INTENDED;
}
}
} catch (IOException ignore) {
// file is broken, but be tolerant here
}
}
// didn't find the expected metadata file
return DecodeQualification.UNABLE;
}
static VirtualDir getInput(Object input) throws IOException {
File inputFile = getFileInput(input);
if (inputFile == null) {
throw new IOException("Unknown input type.");
}
if (inputFile.isFile() && !isCompressedFile(inputFile)) {
final File absoluteFile = inputFile.getAbsoluteFile();
inputFile = absoluteFile.getParentFile();
if (inputFile == null) {
throw new IOException(
"Unable to retrieve parent to file: " + absoluteFile.getAbsolutePath());
}
}
VirtualDir virtualDir = VirtualDir.create(inputFile);
if (virtualDir == null) {
virtualDir = new VirtualDirTgz(inputFile);
}
return virtualDir;
}