/machinelearning/5.0.x/drools-core/src/main/java/org/drools/workflow/core/node/CompositeNode.java

https://github.com/etirelli/droolsjbpm-contributed-experiments · Java · 456 lines · 386 code · 60 blank · 10 comment · 100 complexity · 0fcfa5ab7d957a628a1a2f58b065706c MD5 · raw file 

    

  1. package org.drools.workflow.core.node;

    2. 

  2. 

    3. 

  3. import java.util.ArrayList;

    4. 

  4. import java.util.HashMap;

    5. 

  5. import java.util.List;

    6. 

  6. import java.util.Map;

    7. 

  7. 

    8. 

  8. import org.drools.definition.process.Connection;

    9. 

  9. import org.drools.definition.process.Node;

    10. 

  10. import org.drools.workflow.core.NodeContainer;

    11. 

  11. import org.drools.workflow.core.impl.ConnectionImpl;

    12. 

  12. import org.drools.workflow.core.impl.NodeContainerImpl;

    13. 

  13. import org.drools.workflow.core.impl.NodeImpl;

    14. 

  14. 

    15. 

  15. /**

    16. 

  16.  * 

    17. 

  17.  * @author <a href="mailto:kris_verlaenen@hotmail.com">Kris Verlaenen</a>

    18. 

  18.  */

    19. 

  19. public class CompositeNode extends NodeImpl implements NodeContainer, EventNodeInterface {

    20. 

  20. 

    21. 

  21.     private static final long serialVersionUID = 400L;

    22. 

  22.     

    23. 

  23.     private org.drools.workflow.core.NodeContainer nodeContainer;

    24. 

  24.     private Map<String, CompositeNode.NodeAndType> inConnectionMap = new HashMap<String, CompositeNode.NodeAndType>();

    25. 

  25.     private Map<String, CompositeNode.NodeAndType> outConnectionMap = new HashMap<String, CompositeNode.NodeAndType>();

    26. 

  26.     

    27. 

  27.     public CompositeNode() {

    28. 

  28.         this.nodeContainer = new NodeContainerImpl();

    29. 

  29.     }

    30. 

  30.     

    31. 

  31.     public Node getNode(long id) {

    32. 

  32.         return nodeContainer.getNode(id);

    33. 

  33.     }

    34. 

  34.     

    35. 

  35.     public Node internalGetNode(long id) {

    36. 

  36.     	return getNode(id);

    37. 

  37.     }

    38. 

  38. 

    39. 

  39.     public Node[] getNodes() {

    40. 

  40.     	List<Node> subNodes = new ArrayList<Node>();

    41. 

  41.     	for (Node node: nodeContainer.getNodes()) {

    42. 

  42.     		if (!(node instanceof CompositeNode.CompositeNodeStart) &&

    43. 

  43.     				!(node instanceof CompositeNode.CompositeNodeEnd)) {

    44. 

  44.     			subNodes.add(node);

    45. 

  45.     		}

    46. 

  46.     	}

    47. 

  47.     	return subNodes.toArray(new Node[subNodes.size()]);

    48. 

  48.     }

    49. 

  49. 

    50. 

  50.     public void addNode(Node node) {

    51. 

  51.     	// TODO find a more elegant solution for this

    52. 

  52.     	// preferrable remove id setting from this class

    53. 

  53.     	// and delegate to GUI command that drops node

    54. 

  54.     	if (node.getId() <= 0) {

    55. 

  55. 	    	long id = 0;

    56. 

  56. 	        for (Node n: nodeContainer.getNodes()) {

    57. 

  57. 	            if (n.getId() > id) {

    58. 

  58. 	                id = n.getId();

    59. 

  59. 	            }

    60. 

  60. 	        }

    61. 

  61. 	        ((org.drools.workflow.core.Node) node).setId(++id);

    62. 

  62.     	}

    63. 

  63.     	nodeContainer.addNode(node);

    64. 

  64.         ((org.drools.workflow.core.Node) node).setNodeContainer(this);

    65. 

  65.     }

    66. 

  66.     

    67. 

  67.     protected void internalAddNode(Node node) {

    68. 

  68.     	addNode(node);

    69. 

  69.     }

    70. 

  70.     

    71. 

  71.     public void removeNode(Node node) {

    72. 

  72.         nodeContainer.removeNode(node);

    73. 

  73.         ((org.drools.workflow.core.Node) node).setNodeContainer(null);

    74. 

  74.     }

    75. 

  75.     

    76. 

  76.     protected void internalRemoveNode(Node node) {

    77. 

  77.     	removeNode(node);

    78. 

  78.     }

    79. 

  79.     

    80. 

  80. 	public boolean acceptsEvent(String type, Object event) {

    81. 

  81. 		for (Node node: getNodes()) {

    82. 

  82. 			if (node instanceof EventNodeInterface) {

    83. 

  83. 				if (((EventNodeInterface) node).acceptsEvent(type, event)) {

    84. 

  84. 					return true;

    85. 

  85. 				}

    86. 

  86. 			}

    87. 

  87. 		}

    88. 

  88. 		return false;

    89. 

  89. 	}

    90. 

  90.     

    91. 

  91.     public void linkIncomingConnections(String inType, long inNodeId, String inNodeType) {

    92. 

  92.         linkIncomingConnections(inType, new NodeAndType(inNodeId, inNodeType));

    93. 

  93.     }

    94. 

  94.     

    95. 

  95.     public void linkIncomingConnections(String inType, CompositeNode.NodeAndType inNode) {

    96. 

  96.         CompositeNode.NodeAndType oldNodeAndType = inConnectionMap.get(inType);

    97. 

  97.         if (oldNodeAndType != null) {

    98. 

  98.         	if (oldNodeAndType.equals(inNode)) {

    99. 

  99.         		return;

    100. 

  100.         	} else {

    101. 

  101.         		// remove old start nodes + connections

    102. 

  102.         		List<Connection> oldInConnections = 

    103. 

  103.         			oldNodeAndType.getNode().getIncomingConnections(oldNodeAndType.getType());

    104. 

  104.         		if (oldInConnections != null) {

    105. 

  105.         			for (Connection connection: new ArrayList<Connection>(oldInConnections)) {

    106. 

  106.         				if (connection.getFrom() instanceof CompositeNodeStart) {

    107. 

  107.         					removeNode(connection.getFrom());

    108. 

  108.         					((ConnectionImpl) connection).terminate();

    109. 

  109.         				}

    110. 

  110.         			}

    111. 

  111.         		}

    112. 

  112.         	}

    113. 

  113.         }

    114. 

  114.         inConnectionMap.put(inType, inNode);

    115. 

  115.         if (inNode != null) {

    116. 

  116. 	        List<Connection> connections = getIncomingConnections(inType);

    117. 

  117. 	        for (Connection connection: connections) {

    118. 

  118. 	        	CompositeNodeStart start = new CompositeNodeStart(connection.getFrom(), inType);

    119. 

  119. 		        internalAddNode(start);

    120. 

  120. 		        if (inNode.getNode() != null) {

    121. 

  121. 			        new ConnectionImpl(

    122. 

  122. 			            start, org.drools.workflow.core.Node.CONNECTION_DEFAULT_TYPE, 

    123. 

  123. 			            inNode.getNode(), inNode.getType());

    124. 

  124. 		        }

    125. 

  125. 	        }

    126. 

  126.         }

    127. 

  127.     }

    128. 

  128.     

    129. 

  129.     public void linkOutgoingConnections(long outNodeId, String outNodeType, String outType) {

    130. 

  130.         linkOutgoingConnections(new NodeAndType(outNodeId, outNodeType), outType);

    131. 

  131.     }

    132. 

  132.     

    133. 

  133.     public void linkOutgoingConnections(CompositeNode.NodeAndType outNode, String outType) {

    134. 

  134.         CompositeNode.NodeAndType oldNodeAndType = outConnectionMap.get(outType);

    135. 

  135.         if (oldNodeAndType != null) {

    136. 

  136.         	if (oldNodeAndType.equals(outNode)) {

    137. 

  137.         		return;

    138. 

  138.         	} else {

    139. 

  139.         		// remove old end nodes + connections

    140. 

  140.         		List<Connection> oldOutConnections = 

    141. 

  141.         			oldNodeAndType.getNode().getOutgoingConnections(oldNodeAndType.getType());

    142. 

  142.     			for (Connection connection: new ArrayList<Connection>(oldOutConnections)) {

    143. 

  143.     				if (connection.getTo() instanceof CompositeNodeEnd) {

    144. 

  144.     					removeNode(connection.getTo());

    145. 

  145.     					((ConnectionImpl) connection).terminate();

    146. 

  146.     				}

    147. 

  147.     			}

    148. 

  148.         	}

    149. 

  149.         }

    150. 

  150.         outConnectionMap.put(outType, outNode);

    151. 

  151.         if (outNode != null) {

    152. 

  152. 	        List<Connection> connections = getOutgoingConnections(outType);

    153. 

  153. 	        for (Connection connection: connections) {

    154. 

  154. 		        CompositeNodeEnd end = new CompositeNodeEnd(connection.getTo(), outType);

    155. 

  155. 		        internalAddNode(end);

    156. 

  156. 		        if (outNode.getNode() != null) {

    157. 

  157. 			        new ConnectionImpl(

    158. 

  158. 			            outNode.getNode(), outNode.getType(), 

    159. 

  159. 			            end, org.drools.workflow.core.Node.CONNECTION_DEFAULT_TYPE);

    160. 

  160. 		        }

    161. 

  161. 	        }

    162. 

  162.         }

    163. 

  163.     }

    164. 

  164. 

    165. 

  165.     public CompositeNode.NodeAndType getLinkedIncomingNode(String inType) {

    166. 

  166.         return inConnectionMap.get(inType);

    167. 

  167.     }

    168. 

  168. 

    169. 

  169.     public CompositeNode.NodeAndType internalGetLinkedIncomingNode(String inType) {

    170. 

  170.         return inConnectionMap.get(inType);

    171. 

  171.     }

    172. 

  172. 

    173. 

  173.     public CompositeNode.NodeAndType getLinkedOutgoingNode(String outType) {

    174. 

  174.         return outConnectionMap.get(outType);

    175. 

  175.     }

    176. 

  176.     

    177. 

  177.     public CompositeNode.NodeAndType internalGetLinkedOutgoingNode(String outType) {

    178. 

  178.         return outConnectionMap.get(outType);

    179. 

  179.     }

    180. 

  180. 

    181. 

  181.     public Map<String, CompositeNode.NodeAndType> getLinkedIncomingNodes() {

    182. 

  182.         return inConnectionMap;

    183. 

  183.     }

    184. 

  184.     

    185. 

  185.     public Map<String, CompositeNode.NodeAndType> getLinkedOutgoingNodes() {

    186. 

  186.         return outConnectionMap;

    187. 

  187.     }

    188. 

  188.     

    189. 

  189.     public void validateAddIncomingConnection(final String type, final Connection connection) {

    190. 

  190.     	CompositeNode.NodeAndType nodeAndType = internalGetLinkedIncomingNode(type);

    191. 

  191.     	if (connection.getFrom().getNodeContainer() == this) {

    192. 

  192.     		if (nodeAndType != null) {

    193. 

  193.     			throw new IllegalArgumentException("Cannot link incoming connection type more than once: " + type);

    194. 

  194.     		}

    195. 

  195.     	} else {

    196. 

  196. 	        if (nodeAndType != null) {

    197. 

  197. 	        	NodeImpl node = (NodeImpl) nodeAndType.getNode();

    198. 

  198. 	        	if (node != null) {

    199. 

  199. 	        		node.validateAddIncomingConnection(nodeAndType.getType(), connection);

    200. 

  200. 	        	}

    201. 

  201. 	        }

    202. 

  202.     	}

    203. 

  203.     }

    204. 

  204.     

    205. 

  205.     public void addIncomingConnection(String type, Connection connection) {

    206. 

  206.     	if (connection.getFrom().getNodeContainer() == this) {

    207. 

  207.     		linkOutgoingConnections(connection.getFrom().getId(), connection.getFromType(), org.drools.workflow.core.Node.CONNECTION_DEFAULT_TYPE);

    208. 

  208.     	} else {

    209. 

  209. 	        super.addIncomingConnection(type, connection);

    210. 

  210. 	        CompositeNode.NodeAndType inNode = internalGetLinkedIncomingNode(type);

    211. 

  211. 	        if (inNode != null) {

    212. 

  212. 		        CompositeNodeStart start = new CompositeNodeStart(connection.getFrom(), type);

    213. 

  213. 		        internalAddNode(start);

    214. 

  214. 		        NodeImpl node = (NodeImpl) inNode.getNode();

    215. 

  215. 	        	if (node != null) {

    216. 

  216. 			        new ConnectionImpl(

    217. 

  217. 			            start, org.drools.workflow.core.Node.CONNECTION_DEFAULT_TYPE, 

    218. 

  218. 			            inNode.getNode(), inNode.getType());

    219. 

  219. 	        	}

    220. 

  220. 	        }

    221. 

  221.     	}

    222. 

  222.     }

    223. 

  223.     

    224. 

  224.     public void validateAddOutgoingConnection(final String type, final Connection connection) {

    225. 

  225.         CompositeNode.NodeAndType nodeAndType = internalGetLinkedOutgoingNode(type);

    226. 

  226.         if (connection.getTo().getNodeContainer() == this) {

    227. 

  227.     		if (nodeAndType != null) {

    228. 

  228.     			throw new IllegalArgumentException("Cannot link outgoing connection type more than once: " + type);

    229. 

  229.     		}

    230. 

  230.     	} else {

    231. 

  231.     		if (nodeAndType != null) {

    232. 

  232.     	        NodeImpl node = (NodeImpl) nodeAndType.getNode();

    233. 

  233. 	        	if (node != null) {

    234. 

  234. 	        		((NodeImpl) nodeAndType.getNode()).validateAddOutgoingConnection(nodeAndType.getType(), connection);

    235. 

  235. 	        	}

    236. 

  236. 	        }

    237. 

  237.     	}

    238. 

  238. 	}

    239. 

  239.     

    240. 

  240.     public void addOutgoingConnection(String type, Connection connection) {

    241. 

  241.     	if (connection.getTo().getNodeContainer() == this) {

    242. 

  242.     		linkIncomingConnections(

    243. 

  243. 				org.drools.workflow.core.Node.CONNECTION_DEFAULT_TYPE,

    244. 

  244. 				connection.getTo().getId(),	connection.getToType());    		

    245. 

  245.     	} else {

    246. 

  246. 	        super.addOutgoingConnection(type, connection);

    247. 

  247. 	        CompositeNode.NodeAndType outNode = internalGetLinkedOutgoingNode(type);

    248. 

  248. 	        if (outNode != null) {

    249. 

  249. 		        CompositeNodeEnd end = new CompositeNodeEnd(connection.getTo(), type);

    250. 

  250. 		        internalAddNode(end);

    251. 

  251. 		        NodeImpl node = (NodeImpl) outNode.getNode();

    252. 

  252. 	        	if (node != null) {

    253. 

  253. 	        		new ConnectionImpl(

    254. 

  254.         				outNode.getNode(), outNode.getType(), 

    255. 

  255.         				end, org.drools.workflow.core.Node.CONNECTION_DEFAULT_TYPE);

    256. 

  256. 	        	}

    257. 

  257. 	        }

    258. 

  258.     	}

    259. 

  259.     }

    260. 

  260.     

    261. 

  261.     public void validateRemoveIncomingConnection(final String type, final Connection connection) {

    262. 

  262.         CompositeNode.NodeAndType nodeAndType = internalGetLinkedIncomingNode(type);

    263. 

  263.         if (nodeAndType != null) {

    264. 

  264. 	        for (Connection inConnection: nodeAndType.getNode().getIncomingConnections(nodeAndType.getType())) {

    265. 

  265. 	            if (((CompositeNodeStart) inConnection.getFrom()).getInNodeId() == connection.getFrom().getId()) {

    266. 

  266. 	                ((NodeImpl) nodeAndType.getNode()).validateRemoveIncomingConnection(nodeAndType.getType(), inConnection);

    267. 

  267. 	                return;

    268. 

  268. 	            }

    269. 

  269. 	        }

    270. 

  270. 	        throw new IllegalArgumentException(

    271. 

  271. 	        	"Could not find internal incoming connection for node");

    272. 

  272.         }

    273. 

  273.     }

    274. 

  274.     

    275. 

  275.     public void removeIncomingConnection(String type, Connection connection) {

    276. 

  276.         super.removeIncomingConnection(type, connection);

    277. 

  277.         CompositeNode.NodeAndType nodeAndType = internalGetLinkedIncomingNode(type);

    278. 

  278.         if (nodeAndType != null) {

    279. 

  279. 	        for (Connection inConnection: nodeAndType.getNode().getIncomingConnections(nodeAndType.getType())) {

    280. 

  280. 	            if (((CompositeNodeStart) inConnection.getFrom()).getInNodeId() == connection.getFrom().getId()) {

    281. 

  281. 	                Node compositeNodeStart = inConnection.getFrom();

    282. 

  282. 	                ((ConnectionImpl) inConnection).terminate();

    283. 

  283. 	                internalRemoveNode(compositeNodeStart);

    284. 

  284. 	                return;

    285. 

  285. 	            }

    286. 

  286. 	        }

    287. 

  287. 	        throw new IllegalArgumentException(

    288. 

  288. 	        	"Could not find internal incoming connection for node");

    289. 

  289.         }

    290. 

  290.     }

    291. 

  291.     

    292. 

  292.     public void validateRemoveOutgoingConnection(final String type, final Connection connection) {

    293. 

  293.         CompositeNode.NodeAndType nodeAndType = internalGetLinkedOutgoingNode(type);

    294. 

  294.         if (nodeAndType != null) {

    295. 

  295. 	        for (Connection outConnection: nodeAndType.getNode().getOutgoingConnections(nodeAndType.getType())) {

    296. 

  296. 	            if (((CompositeNodeEnd) outConnection.getTo()).getOutNodeId() == connection.getTo().getId()) {

    297. 

  297. 	                ((NodeImpl) nodeAndType.getNode()).validateRemoveOutgoingConnection(nodeAndType.getType(), outConnection);

    298. 

  298. 	                return;

    299. 

  299. 	            }

    300. 

  300. 	        }

    301. 

  301. 	        throw new IllegalArgumentException(

    302. 

  302. 	            "Could not find internal outgoing connection for node");

    303. 

  303.         }

    304. 

  304.     }

    305. 

  305.     

    306. 

  306.     public void removeOutgoingConnection(String type, Connection connection) {

    307. 

  307.         super.removeOutgoingConnection(type, connection);

    308. 

  308.         CompositeNode.NodeAndType nodeAndType = internalGetLinkedOutgoingNode(type);

    309. 

  309.         if (nodeAndType != null) {

    310. 

  310. 	        for (Connection outConnection: nodeAndType.getNode().getOutgoingConnections(nodeAndType.getType())) {

    311. 

  311. 	            if (((CompositeNodeEnd) outConnection.getTo()).getOutNodeId() == connection.getTo().getId()) {

    312. 

  312. 	                Node compositeNodeEnd = outConnection.getTo();

    313. 

  313. 	                ((ConnectionImpl) outConnection).terminate();

    314. 

  314. 	                internalRemoveNode(compositeNodeEnd);

    315. 

  315. 	                return;

    316. 

  316. 	            }

    317. 

  317. 	        }

    318. 

  318. 	        throw new IllegalArgumentException(

    319. 

  319. 	            "Could not find internal outgoing connection for node");

    320. 

  320.         }

    321. 

  321.     }

    322. 

  322.     

    323. 

  323.     public class NodeAndType {

    324. 

  324. 

    325. 

  325.         private long nodeId;

    326. 

  326.         private String type;

    327. 

  327.         private transient Node node;

    328. 

  328.         

    329. 

  329.         public NodeAndType(long nodeId, String type) {

    330. 

  330.             if (type == null) {

    331. 

  331.                 throw new IllegalArgumentException(

    332. 

  332.                     "Node or type may not be null!");

    333. 

  333.             }

    334. 

  334.             this.nodeId = nodeId;

    335. 

  335.             this.type = type;

    336. 

  336.         }

    337. 

  337.         

    338. 

  338.         public NodeAndType(Node node, String type) {

    339. 

  339.             if (node == null || type == null) {

    340. 

  340.                 throw new IllegalArgumentException(

    341. 

  341.                     "Node or type may not be null!");

    342. 

  342.             }

    343. 

  343.             this.nodeId = node.getId();

    344. 

  344.             this.node = node;

    345. 

  345.             this.type = type;

    346. 

  346.         }

    347. 

  347.         

    348. 

  348.         public Node getNode() {

    349. 

  349.             if (node == null) {

    350. 

  350.                 try {

    351. 

  351.                 	node = nodeContainer.getNode(nodeId);

    352. 

  352.                 } catch (IllegalArgumentException e) {

    353. 

  353.                 	// unknown node id, returning null

    354. 

  354.                 }

    355. 

  355.             }

    356. 

  356.             return node;

    357. 

  357.         }

    358. 

  358.         

    359. 

  359.         public long getNodeId() {

    360. 

  360.             return nodeId;

    361. 

  361.         }

    362. 

  362. 

    363. 

  363.         public String getType() {

    364. 

  364.             return type;

    365. 

  365.         }

    366. 

  366.         

    367. 

  367.         public boolean equals(Object o) {

    368. 

  368.             if (o instanceof NodeAndType) {

    369. 

  369.                 return nodeId == ((NodeAndType) o).nodeId

    370. 

  370.                     && type.equals(((NodeAndType) o).type); 

    371. 

  371.             }

    372. 

  372.             return false;

    373. 

  373.         }

    374. 

  374.         

    375. 

  375.         public int hashCode() {

    376. 

  376.             return 7*(int)nodeId + 13*type.hashCode();

    377. 

  377.         }

    378. 

  378.         

    379. 

  379.     }

    380. 

  380.     

    381. 

  381.     public class CompositeNodeStart extends NodeImpl {

    382. 

  382. 

    383. 

  383.         private static final long serialVersionUID = 400L;

    384. 

  384.         

    385. 

  385.         private long inNodeId;

    386. 

  386.         private transient Node inNode;

    387. 

  387.         private String inType;

    388. 

  388.         

    389. 

  389.         public CompositeNodeStart(Node outNode, String outType) {

    390. 

  390.             setName("Composite node start");

    391. 

  391.             this.inNodeId = outNode.getId();

    392. 

  392.             this.inNode = outNode;

    393. 

  393.             this.inType = outType;

    394. 

  394.             setMetaData("hidden", true);

    395. 

  395.        }

    396. 

  396.         

    397. 

  397.         public Node getInNode() {

    398. 

  398.             if (inNode == null) {

    399. 

  399.                 inNode = getNodeContainer().getNode(inNodeId);

    400. 

  400.             }

    401. 

  401.             return inNode;

    402. 

  402.         }

    403. 

  403.         

    404. 

  404.         public long getInNodeId() {

    405. 

  405.             return inNodeId;

    406. 

  406.         }

    407. 

  407.         

    408. 

  408.         public String getInType() {

    409. 

  409.             return inType;

    410. 

  410.         }

    411. 

  411.         

    412. 

  412.         public Connection getTo() {

    413. 

  413.             final List<Connection> list =

    414. 

  414.                 getOutgoingConnections(org.drools.workflow.core.Node.CONNECTION_DEFAULT_TYPE);

    415. 

  415.             if (list.size() > 0) {

    416. 

  416.                 return (Connection) list.get(0);

    417. 

  417.             }

    418. 

  418.             return null;

    419. 

  419.         }

    420. 

  420.         

    421. 

  421.     }

    422. 

  422.     

    423. 

  423.     public class CompositeNodeEnd extends NodeImpl {

    424. 

  424. 

    425. 

  425.         private static final long serialVersionUID = 400L;

    426. 

  426.         

    427. 

  427.         private long outNodeId;

    428. 

  428.         private transient Node outNode;

    429. 

  429.         private String outType;

    430. 

  430.         

    431. 

  431.         public CompositeNodeEnd(Node outNode, String outType) {

    432. 

  432.             setName("Composite node end");

    433. 

  433.             this.outNodeId = outNode.getId();

    434. 

  434.             this.outNode = outNode;

    435. 

  435.             this.outType = outType;

    436. 

  436.             setMetaData("hidden", true);

    437. 

  437.         }

    438. 

  438.         

    439. 

  439.         public Node getOutNode() {

    440. 

  440.             if (outNode == null) {

    441. 

  441.                 outNode = getNodeContainer().getNode(outNodeId);

    442. 

  442.             }

    443. 

  443.             return outNode;

    444. 

  444.         }

    445. 

  445.         

    446. 

  446.         public long getOutNodeId() {

    447. 

  447.             return outNodeId;

    448. 

  448.         }

    449. 

  449.         

    450. 

  450.         public String getOutType() {

    451. 

  451.             return outType;

    452. 

  452.         }

    453. 

  453.         

    454. 

  454.     }

    455. 

  455. 

    456. 

  456. }
    457.