public Builder ifMatches(byte[] family, byte[] qualifier, CompareOperator compareOp,
      byte[] value) {
      this.family = Preconditions.checkNotNull(family, "family is null");
      this.qualifier = qualifier;
      this.op = Preconditions.checkNotNull(compareOp, "compareOp is null");
      this.value = value;
      return this;
    }
Check for match
@param family    family to check
@param qualifier qualifier to check
@param compareOp comparison operator to use
@param value     the expected value
@return the CheckAndMutate object
hbase-client/src/main/java/org/apache/hadoop/hbase/client/CheckAndMutate.java