| Methods Summary |
|---|
| public long | getVersion()version number when this SegmentInfos was generated.
return version;
|
| public final org.apache.lucene.index.SegmentInfo | info(int i) //counts how often the index has been changed by adding or deleting docs
return (SegmentInfo) elementAt(i);
|
| public final void | read(org.apache.lucene.store.Directory directory)
InputStream input = directory.openFile("segments");
try {
int format = input.readInt();
if(format < 0){ // file contains explicit format info
// check that it is a format we can understand
if (format < FORMAT)
throw new IOException("Unknown format version: " + format);
version = input.readLong(); // read version
counter = input.readInt(); // read counter
}
else{ // file is in old format without explicit format info
counter = format;
}
for (int i = input.readInt(); i > 0; i--) { // read segmentInfos
SegmentInfo si =
new SegmentInfo(input.readString(), input.readInt(), directory);
addElement(si);
}
if(format >= 0){ // in old format the version number may be at the end of the file
if (input.getFilePointer() >= input.length())
version = 0; // old file format without version number
else
version = input.readLong(); // read version
}
}
finally {
input.close();
}
|
| public static long | readCurrentVersion(org.apache.lucene.store.Directory directory)Current version number from segments file.
InputStream input = directory.openFile("segments");
int format = 0;
long version = 0;
try {
format = input.readInt();
if(format < 0){
if (format < FORMAT)
throw new IOException("Unknown format version: " + format);
version = input.readLong(); // read version
}
}
finally {
input.close();
}
if(format < 0)
return version;
// We cannot be sure about the format of the file.
// Therefore we have to read the whole file and cannot simply seek to the version entry.
SegmentInfos sis = new SegmentInfos();
sis.read(directory);
return sis.getVersion();
|
| public final void | write(org.apache.lucene.store.Directory directory)
OutputStream output = directory.createFile("segments.new");
try {
output.writeInt(FORMAT); // write FORMAT
output.writeLong(++version); // every write changes the index
output.writeInt(counter); // write counter
output.writeInt(size()); // write infos
for (int i = 0; i < size(); i++) {
SegmentInfo si = info(i);
output.writeString(si.name);
output.writeInt(si.docCount);
}
}
finally {
output.close();
}
// install new segment info
directory.renameFile("segments.new", "segments");
|
