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import { IRequest } from "../../../server/request";
import { DataType } from "../../data/data-type";
import { Database } from "../../data/database";
import { DatabaseValue } from "../../data/database-value";
import { RedisToken } from "../../protocol/redis-token";
import { IRespCommand } from "../resp-command";
/**
* ### Available since 1.0.0.
* ### SDIFF key [key ...]
*
* Returns the members of the set resulting from the difference between the first set and all
* the successive sets.
*
* ### For example:
* ```
* key1 = {a,b,c,d}
* key2 = {c}
* key3 = {a,c,e}
* SDIFF key1 key2 key3 = {b,d}
* ```
* Keys that do not exist are considered to be empty sets.
* ### Return value
* Array reply: list with members of the resulting set.
* ### Examples
* ```
* redis> SADD key1 "a"
* (integer) 1
* redis> SADD key1 "b"
* (integer) 1
* redis> SADD key1 "c"
* (integer) 1
* redis> SADD key2 "c"
* (integer) 1
* redis> SADD key2 "d"
* (integer) 1
* redis> SADD key2 "e"
* (integer) 1
* redis> SDIFF key1 key2
* 1) "a"
* 2) "b"
* redis>
* ```
*/
export class SDiffCommand extends IRespCommand {
public DbDataType = DataType.SET
public maxParams = -1
public minParams = 1
public name = "sdiff"
private logger: Logger = new Logger(module.id);
public execSync(request: IRequest, db: Database): RedisToken {
this.logger.debug(
`${request.getCommand()}.execute(%s)`,
...request.getParams()
);
const result: RedisToken[] = [],
skey: string = request.getParam(0);
if (db.exists(skey)) {
const dbKey: DatabaseValue = db.get(skey),
diffset: Set<any> = new Set();
for (let index = 1; index < request.getParams().length; index++) {
const dbDiff: DatabaseValue = db.get(request.getParam(index));
if (dbDiff && dbDiff.getType() === DataType.SET) {
dbDiff.getSet().forEach((element) => {
if (!diffset.has(element)) {
diffset.add(element);
}
});
}
}
dbKey.getSet().forEach((element) => {
if (!diffset.has(element)) {
result.push(RedisToken.string(element));
}
});
}
return RedisToken.array(result);
}
}
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