SYNOPSIS

my $snapshot = Lucy::Index::Snapshot->new;
$snapshot->read_file( folder => $folder ); # load most recent snapshot
my $files = $snapshot->list;
print "$_\n" for @$files;

DESCRIPTION

A Snapshot is list of index files and folders. Because index files, once written, are never modified, a Snapshot defines a point-in-time view of the data in an index.

IndexReader objects interpret the data associated with a single Snapshot.

CONSTRUCTORS

new()

    my $snapshot = Lucy::Index::Snapshot->new;

Constructor. Takes no arguments.

METHODS

list()

Return an array of all entries.

num_entries()

Return the number of entries (including directories).

add_entry(entry)

Add a filepath to the snapshot.

delete_entry(entry)

Delete a filepath from the snapshot.

Returns: true if the entry existed and was successfully deleted, false otherwise.

read_file( [labeled params] )

Decode a snapshot file and initialize the object to reflect its contents.

• folder - A Folder.
• path - The location of the snapshot file. If not supplied, the most recent snapshot file in the base directory will be chosen.

Returns: the object, allowing an assignment idiom.

write_file( [labeled params] )

Write a snapshot file. The caller must lock the index while this operation takes place, and the operation will fail if the snapshot file already exists.

• folder - A Folder.
• path - The path of the file to write. If undef, a file name will be chosen which supersedes the latest snapshot file in the index folder.

set_path(path)

Set the path to the file that the Snapshot object serves as a proxy for.

get_path()

Get the path to the snapshot file. Initially undef; updated by read_file(), write_file(), and set_path().

INHERITANCE

Lucy::Index::Snapshot isa Lucy::Object::Obj.