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#
Baloo
Baloo
provides
the
searching
and
indexing
infrastructure
with
an
emphasis
on
files
.
##
Baloo
Core
Library
The
core
library
provides
a
-
Query
Interface
-
Search
Stores
###
Query
Interface
The
Query
interface
provides
a
convenient
API
for
clients
to
write
queries
which
form
a
tree
like
syntax
of
terms
which
can
be
ANDed
and
ORed
together
.
Each
term
comprises
of
a
property
name
,
a
value
and
a
comparison
operator
.
The
property
names
which
are
used
in
the
terms
are
just
strings
.
The
properties
supported
depend
on
the
Search
Store
which
is
being
queried
.
Queries
additionally
can
also
stored
date
filters
,
a
global
search
string
,
an
offset
,
a
limit
and
a
sorting
mechanism
for
the
results
.
Each
Query
can
also
be
converted
into
a
byte
array
where
the
query
is
represented
in
a
simple
JSON
format
.
###
Search
Store
A
Search
Store
is
a
plugin
which
implements
the
parsing
of
a
Query
and
returns
the
results
.
Each
search
store
registers
a
set
of
types
,
represented
as
strings
,
whose
results
it
can
provide
.
The
client
,
when
constructing
a
query
provides
a
list
of
types
.
Based
on
the
type
,
the
correct
Search
Store
Plugin
is
run
.
Each
Search
Store
can
interpret
the
query
in
the
manner
they
see
fit
and
return
results
accordingly
.
This
is
typically
done
by
maintaining
an
index
for
faster
search
,
but
it
is
not
necessary
.
##
Baloo
File
Baloo
has
an
emphasis
on
file
searching
.
It
ships
with
a
daemon
`
baloo_file
`
which
is
responsible
for
maintaining
an
index
of
the
users
files
.
It
uses
the
KFileMetaData
framework
in
order
to
extract
metadata
and
text
from
the
files
.
It
also
ships
via
a
searching
plugin
.
###
File
Search
Store
In
order
to
facilitate
searching
,
Baloo
provides
a
search
store
plugin
which
can
be
used
to
query
for
files
which
specific
properties
.
In
the
most
general
case
the
`
Query
::
setQueryString
`
should
be
used
to
do
a
global
search
over
all
properties
in
all
the
files
.
Supported
Properties
:
Lookup
the
properties
via
KFileMetaData
property
list
Supported
Types
:
Supports
the
"File"
type
along
with
further
specialized
types
Lookup
the
list
of
types
via
the
KFileMetaData
type
list
.
###
File
Indexing
Baloo
ships
with
an
daemon
`
baloo_file
`
which
is
responsible
for
maintaining
an
index
of
the
users
files
.
This
process
utilizes
inotify
in
order
to
track
file
changes
.
It
performs
the
indexing
in
2
phases
.
*
Phase
1
-
Index
the
filename
,
fast
mimetype
and
mtime
of
the
file
*
Phase
2
-
Index
the
file
contents
.
This
is
performed
in
a
separate
process
,
as
the
metadata
extraction
plugins
,
provided
by
KFileMetaData
,
can
potentially
crash
.
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