package com.lambdaworks.redis;
import static com.lambdaworks.redis.protocol.CommandKeyword.*;
import com.lambdaworks.redis.internal.LettuceAssert;
import com.lambdaworks.redis.protocol.CommandArgs;
/**
* Argument list builder for the redis scan commans (scan, hscan, sscan, zscan) . Static import the methods from {@link Builder}
* and chain the method calls: {@code matches("weight_*").limit(0, 2)}.
*
* @author Mark Paluch
* @since 3.0
*/
public class ScanArgs {
private Long count;
private String match;
/**
* Static builder methods.
*/
public static class Builder {
/**
* Utility constructor.
*/
private Builder() {
}
/**
* Create a new instance of {@link ScanArgs} with limit.
*
* @param count number of elements to scan
* @return a new instance of {@link ScanArgs}
*/
public static ScanArgs limit(long count) {
return new ScanArgs().limit(count);
}
/**
* Create a new instance of {@link ScanArgs} with match filter.
*
* @param matches the filter
* @return a new instance of {@link ScanArgs}
*/
public static ScanArgs matches(String matches) {
return new ScanArgs().match(matches);
}
}
/**
* Match filter
*
* @param match the filter
* @return the current instance of {@link ScanArgs}
*/
public ScanArgs match(String match) {
LettuceAssert.notNull(match, "Match must not be null");
this.match = match;
return this;
}
/**
* Limit the scan by count
*
* @param count number of elements to scan
* @return the current instance of {@link ScanArgs}
*/
public ScanArgs limit(long count) {
this.count = count;
return this;
}
<K, V> void build(CommandArgs<K, V> args) {
if (match != null) {
args.add(MATCH).add(match);
}
if (count != null) {
args.add(COUNT).add(count);
}
}
}