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package bjc.esodata;
import java.util.AbstractMap;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* A string-keyed set of maps.
*
* @author bjculkin
*
* @param <KeyType>
* The key type of the maps.
* @param <ValueType>
* The value type of the maps.
*/
public class MapSet<KeyType, ValueType> extends AbstractMap<KeyType, ValueType> {
private Map<String, Map<KeyType, ValueType>> backing;
private Map<KeyType, ValueType> currentMap = null;
/**
* Create a new set of maps.
*/
public MapSet() {
backing = new HashMap<>();
}
/**
* Create a new set of maps, with the specified set of maps.
*
* @param back
* The set of maps to use.
*/
public MapSet(Map<String, Map<KeyType, ValueType>> back) {
backing = back;
}
/**
* Add a keyed map.
*
* @param key
* The key for the map.
* @param map
* The map itself.
*/
public void addMap(String key, Map<KeyType, ValueType> map) {
backing.put(key, map);
}
/**
* Clear out the contents of the set
*/
public void clearMap() {
currentMap = null;
backing.clear();
}
/**
* Check if there is a map attached to the specified key.
*
* @param key
* The key to look for.
* @return Whether or not there is anything attached to the key.
*/
public boolean containsMap(String key) {
return backing.containsKey(key);
}
/**
* Get the map attached to a specified key.
*
* @param key
* The key to look for.
* @return The map attached to the key.
*/
public Map<KeyType, ValueType> getMap(String key) {
return backing.get(key);
}
/**
* Get all of the backing entries.
*
* @return The backing entries.
*/
public Set<Map.Entry<String, Map<KeyType, ValueType>>> getMapEntries() {
return backing.entrySet();
}
/**
* Get all of the keys.
*
* @return The keys currently in use.
*/
public Set<String> getMapKeys() {
return backing.keySet();
}
/**
* Get all of the keyed maps.
*
* @return The keyed maps.
*/
public Collection<Map<KeyType, ValueType>> getMapValues() {
return backing.values();
}
/**
* Set the current map.
*
* @param key
* The key to use as the current map.
* @return False if there is no map attached to the key, true otherwise.
*/
public boolean setMap(String key) {
if (!backing.containsKey(key))
return false;
currentMap = backing.get(key);
return true;
}
/**
* Sets the current map, or creates a new one if there isn't one attached to
* that key.
*
* @param key
* The key to use as the current map.
*/
public void setCreateMap(String key) {
if (!backing.containsKey(key)) {
currentMap = new HashMap<>();
backing.put(key, currentMap);
return;
}
currentMap = backing.get(key);
}
/**
* Set the current map, or bind a map to it.
*
* @param key
* The key to set or bind.
* @param map
* The map to bind to the key if it isn't present.
*/
public void setPutMap(String key, Map<KeyType, ValueType> map) {
if (!backing.containsKey(key)) {
currentMap = map;
backing.put(key, map);
return;
}
currentMap = backing.get(key);
}
@Override
public Set<Map.Entry<KeyType, ValueType>> entrySet() {
if (currentMap == null)
throw new NullPointerException("Current map is not set");
return currentMap.entrySet();
}
@Override
public ValueType put(KeyType key, ValueType value) {
if (currentMap == null)
throw new NullPointerException("Current map is not set");
return currentMap.put(key, value);
}
}
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