public ReplicationSet addRegionMapEntry(String key, RegionInfo value) {
        if (null == this.regionMap) {
            this.regionMap = new java.util.HashMap<String, RegionInfo>();
        }
        if (this.regionMap.containsKey(key))
            throw new IllegalArgumentException("Duplicated keys (" + key.toString() + ") are provided.");
        this.regionMap.put(key, value);
        return this;
    }
Add a single RegionMap entry

@see ReplicationSet#withRegionMap
@returns a reference to this object so that method calls can be chained together.
aws-java-sdk-ssmincidents/src/main/java/com/amazonaws/services/ssmincidents/model/ReplicationSet.java