package com.lambdaworks.redis;
/**
* Value object for a slice of data (offset/count).
*
* @author Mark Paluch
* @since 4.2
*/
public class Limit {
private static final Limit UNLIMITED = new Limit(null, null);
private final Long offset;
private final Long count;
protected Limit(Long offset, Long count) {
this.offset = offset;
this.count = count;
}
/**
*
* @return an unlimited limit.
*/
public static Limit unlimited() {
return UNLIMITED;
}
/**
* Creates a {@link Limit} given {@code offset} and {@code count}.
*
* @param offset
* @param count
* @return the {@link Limit}
*/
public static Limit create(long offset, long count) {
return new Limit(offset, count);
}
/**
* @return the offset or {@literal -1} if unlimited.
*/
public long getOffset() {
if (offset != null) {
return offset;
}
return -1;
}
/**
* @return the count or {@literal -1} if unlimited.
*/
public long getCount() {
if (count != null) {
return count;
}
return -1;
}
/**
*
* @return {@literal true} if the {@link Limit} contains a limitation.
*/
public boolean isLimited() {
return offset != null && count != null;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(getClass().getSimpleName());
if (isLimited()) {
return sb.append(" [offset=").append(getOffset()).append(", count=").append(getCount()).append("]").toString();
}
return sb.append(" [unlimited]").toString();
}
}