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JSON-java/zip/MapKeep.java at master · ROMMM/JSON-java · GitHub
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package
org
.
json
.
zip
;
import
java
.
util
.
HashMap
;
import
org
.
json
.
Kim
;
/*
Copyright (c) 2013 JSON.org
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
The Software shall be used for Good, not Evil.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
/**
* A keep is an associative data structure that maintains usage counts of each
* of the associations in its keeping. When the keep becomes full, it purges
* little used associations, and ages the survivors. Each key is assigned an
* integer value. When the keep is compacted, each key can be given a new
* value.
*/
class
MapKeep
extends
Keep
{
private
Object
[]
list
;
private
HashMap
map
;
/**
* Create a new Keep.
* @param bits
* The capacity of the keep expressed in the number of bits
* required to hold an integer.
*/
public
MapKeep
(
int
bits
) {
super
(
bits
);
this
.
list
=
new
Object
[
this
.
capacity
];
this
.
map
=
new
HashMap
(
this
.
capacity
);
}
/**
* Compact the keep. A keep may contain at most this.capacity elements.
* The keep contents can be reduced by deleting all elements with low use
* counts, and by reducing the use counts of the survivors.
*/
private
void
compact
() {
int
from
=
0
;
int
to
=
0
;
while
(
from
<
this
.
capacity
) {
Object
key
=
this
.
list
[
from
];
long
usage
=
age
(
this
.
uses
[
from
]);
if
(
usage
>
0
) {
this
.
uses
[
to
] =
usage
;
this
.
list
[
to
] =
key
;
this
.
map
.
put
(
key
,
new
Integer
(
to
));
to
+=
1
;
}
else
{
this
.
map
.
remove
(
key
);
}
from
+=
1
;
}
if
(
to
<
this
.
capacity
) {
this
.
length
=
to
;
}
else
{
this
.
map
.
clear
();
this
.
length
=
0
;
}
this
.
power
=
0
;
}
/**
* Find the integer value associated with this key, or nothing if this key
* is not in the keep.
*
* @param key
* An object.
* @return An integer
*/
public
int
find
(
Object
key
) {
Object
o
=
this
.
map
.
get
(
key
);
return
o
instanceof
Integer
? ((
Integer
)
o
).
intValue
() :
none
;
}
public
boolean
postMortem
(
PostMortem
pm
) {
MapKeep
that
= (
MapKeep
)
pm
;
if
(
this
.
length
!=
that
.
length
) {
JSONzip
.
log
(
this
.
length
+
" <> "
+
that
.
length
);
return
false
;
}
for
(
int
i
=
0
;
i
<
this
.
length
;
i
+=
1
) {
boolean
b
;
if
(
this
.
list
[
i
]
instanceof
Kim
) {
b
= ((
Kim
)
this
.
list
[
i
]).
equals
(
that
.
list
[
i
]);
}
else
{
Object
o
=
this
.
list
[
i
];
Object
q
=
that
.
list
[
i
];
if
(
o
instanceof
Number
) {
o
=
o
.
toString
();
}
if
(
q
instanceof
Number
) {
q
=
q
.
toString
();
}
b
=
o
.
equals
(
q
);
}
if
(!
b
) {
JSONzip
.
log
(
"
\n
["
+
i
+
"]
\n
"
+
this
.
list
[
i
] +
"
\n
"
+
that
.
list
[
i
] +
"
\n
"
+
this
.
uses
[
i
] +
"
\n
"
+
that
.
uses
[
i
]);
return
false
;
}
}
return
true
;
}
/**
* Register a value in the keep. Compact the keep if it is full. The next
* time this value is encountered, its integer can be sent instead.
* @param value A value.
*/
public
void
register
(
Object
value
) {
if
(
JSONzip
.
probe
) {
int
integer
=
find
(
value
);
if
(
integer
>=
0
) {
JSONzip
.
log
(
"
\n
Duplicate key "
+
value
);
}
}
if
(
this
.
length
>=
this
.
capacity
) {
compact
();
}
this
.
list
[
this
.
length
] =
value
;
this
.
map
.
put
(
value
,
new
Integer
(
this
.
length
));
this
.
uses
[
this
.
length
] =
1
;
if
(
JSONzip
.
probe
) {
JSONzip
.
log
(
"<"
+
this
.
length
+
" "
+
value
+
"> "
);
}
this
.
length
+=
1
;
}
/**
* Return the value associated with the integer.
* @param integer The number of an item in the keep.
* @return The value.
*/
public
Object
value
(
int
integer
) {
return
this
.
list
[
integer
];
}
}
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