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1: /* DefaultTreeModel.java -- 2: Copyright (C) 2002, 2004, 2005, 2006, Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: package javax.swing.tree; 39: 40: import java.io.IOException; 41: import java.io.ObjectInputStream; 42: import java.io.ObjectOutputStream; 43: import java.io.Serializable; 44: import java.util.EventListener; 45: 46: import javax.swing.event.EventListenerList; 47: import javax.swing.event.TreeModelEvent; 48: import javax.swing.event.TreeModelListener; 49: 50: /** 51: * DefaultTreeModel 52: * 53: * @author Andrew Selkirk 54: */ 55: public class DefaultTreeModel 56: implements Serializable, TreeModel 57: { 58: static final long serialVersionUID = -2621068368932566998L; 59: 60: /** 61: * root 62: */ 63: protected TreeNode root; 64: 65: /** 66: * listenerList 67: */ 68: protected EventListenerList listenerList = new EventListenerList(); 69: 70: /** 71: * asksAllowsChildren 72: */ 73: protected boolean asksAllowsChildren; 74: 75: /** 76: * Constructor DefaultTreeModel where any node can have children. 77: * 78: * @param root the tree root. 79: */ 80: public DefaultTreeModel(TreeNode root) 81: { 82: this (root, false); 83: } 84: 85: /** 86: * Create the DefaultTreeModel that may check if the nodes can have 87: * children or not. 88: * 89: * @param aRoot the tree root. 90: * @param asksAllowsChildren if true, each node is asked if it can have 91: * children. If false, the model does not care about this, supposing, that 92: * any node can have children. 93: */ 94: public DefaultTreeModel(TreeNode aRoot, boolean asksAllowsChildren) 95: { 96: if (aRoot == null) 97: aRoot = new DefaultMutableTreeNode(); 98: this.root = aRoot; 99: this.asksAllowsChildren = asksAllowsChildren; 100: } 101: 102: /** 103: * writeObject 104: * 105: * @param obj the object. 106: * @exception IOException TODO 107: */ 108: private void writeObject(ObjectOutputStream obj) throws IOException 109: { 110: // TODO 111: } 112: 113: /** 114: * readObject 115: * 116: * @param value0 TODO 117: * @exception IOException TODO 118: * @exception ClassNotFoundException TODO 119: */ 120: private void readObject(ObjectInputStream value0) throws IOException, 121: ClassNotFoundException 122: { 123: // TODO 124: } 125: 126: /** 127: * asksAllowsChildren 128: * 129: * @return boolean 130: */ 131: public boolean asksAllowsChildren() 132: { 133: return asksAllowsChildren; 134: } 135: 136: /** 137: * setAsksAllowsChildren 138: * 139: * @param value TODO 140: */ 141: public void setAsksAllowsChildren(boolean value) 142: { 143: asksAllowsChildren = value; 144: } 145: 146: /** 147: * setRoot 148: * 149: * @param root the root node. 150: */ 151: public void setRoot(TreeNode root) 152: { 153: this.root = root; 154: } 155: 156: /** 157: * getRoot 158: * 159: * @return Object 160: */ 161: public Object getRoot() 162: { 163: return root; 164: } 165: 166: /** 167: * getIndexOfChild 168: * 169: * @param parent TODO 170: * @param child TODO 171: * @return int 172: */ 173: public int getIndexOfChild(Object parent, Object child) 174: { 175: for (int i = 0; i < getChildCount(parent); i++) 176: { 177: if (getChild(parent, i).equals(child)) 178: return i; 179: } 180: return -1; 181: } 182: 183: /** 184: * getChild 185: * 186: * @param node TODO 187: * @param idx TODO 188: * @return Object 189: */ 190: public Object getChild(Object node, int idx) 191: { 192: if (node instanceof TreeNode) 193: return ((TreeNode) node).getChildAt(idx); 194: else 195: return null; 196: } 197: 198: /** 199: * getChildCount 200: * 201: * @param node TODO 202: * @return int 203: */ 204: public int getChildCount(Object node) 205: { 206: if (node instanceof TreeNode) 207: return ((TreeNode) node).getChildCount(); 208: else 209: return 0; 210: } 211: 212: /** 213: * Returns if the specified node is a leaf or not. When 214: * {@link #asksAllowsChildren} is true, then this checks if the TreeNode 215: * allows children, otherwise it returns the TreeNode's <code>leaf</code> 216: * property. 217: * 218: * @param node the node to check 219: * 220: * @return boolean <code>true</code> if the node is a leaf node, 221: * <code>false</code> otherwise 222: * 223: * @throws ClassCastException if the specified node is not a 224: * <code>TreeNode</code> instance 225: * 226: * @see TreeNode#getAllowsChildren() 227: * @see TreeNode#isLeaf() 228: */ 229: public boolean isLeaf(Object node) 230: { 231: // The RI throws a ClassCastException when node isn't a TreeNode, so do we. 232: TreeNode treeNode = (TreeNode) node; 233: boolean leaf; 234: if (asksAllowsChildren) 235: leaf = ! treeNode.getAllowsChildren(); 236: else 237: leaf = treeNode.isLeaf(); 238: return leaf; 239: } 240: 241: /** 242: * <p> 243: * Invoke this method if you've modified the TreeNodes upon which this model 244: * depends. The model will notify all of its listeners that the model has 245: * changed. It will fire the events, necessary to update the layout caches and 246: * repaint the tree. The tree will <i>not</i> be properly refreshed if you 247: * call the JTree.repaint instead. 248: * </p> 249: * <p> 250: * This method will refresh the information about whole tree from the root. If 251: * only part of the tree should be refreshed, it is more effective to call 252: * {@link #reload(TreeNode)}. 253: * </p> 254: */ 255: public void reload() 256: { 257: // Need to duplicate the code because the root can formally be 258: // no an instance of the TreeNode. 259: int n = getChildCount(root); 260: int[] childIdx = new int[n]; 261: Object[] children = new Object[n]; 262: 263: for (int i = 0; i < n; i++) 264: { 265: childIdx[i] = i; 266: children[i] = getChild(root, i); 267: } 268: 269: fireTreeStructureChanged(this, new Object[] { root }, childIdx, children); 270: } 271: 272: /** 273: * Invoke this method if you've modified the TreeNodes upon which this model 274: * depends. The model will notify all of its listeners that the model has 275: * changed. It will fire the events, necessary to update the layout caches and 276: * repaint the tree. The tree will <i>not</i> be properly refreshed if you 277: * call the JTree.repaint instead. 278: * 279: * @param node - the tree node, from which the tree nodes have changed 280: * (inclusive). If you do not know this node, call {@link #reload()} 281: * instead. 282: */ 283: public void reload(TreeNode node) 284: { 285: int n = getChildCount(node); 286: int[] childIdx = new int[n]; 287: Object[] children = new Object[n]; 288: 289: for (int i = 0; i < n; i++) 290: { 291: childIdx[i] = i; 292: children[i] = getChild(node, i); 293: } 294: 295: fireTreeStructureChanged(this, getPathToRoot(node), childIdx, children); 296: } 297: 298: /** 299: * Messaged when the user has altered the value for the item 300: * identified by path to newValue. If newValue signifies a truly new 301: * value the model should post a treeNodesChanged event. 302: * This sets the user object of the TreeNode identified by 303: * path and posts a node changed. If you use custom user objects 304: * in the TreeModel you're going to need to subclass this and set 305: * the user object of the changed node to something meaningful. 306: * 307: * @param path - path to the node that the user has altered 308: * @param newValue - the new value from the TreeCellEditor 309: */ 310: public void valueForPathChanged(TreePath path, Object newValue) 311: { 312: Object node = path.getLastPathComponent(); 313: if (node instanceof MutableTreeNode) 314: { 315: ((MutableTreeNode) node).setUserObject(newValue); 316: int[] ci = null; 317: Object[] c = null; 318: Object[] parentPath = path.getPath(); 319: if (path.getPathCount() > 1) 320: { 321: Object parent = ((TreeNode) node).getParent(); 322: ci = new int[1]; 323: ci[0] = getIndexOfChild(parent, node); 324: node = newValue; 325: path = path.getParentPath().pathByAddingChild(node); 326: c = new Object[1]; 327: c[0] = node; 328: parentPath = path.getParentPath().getPath(); 329: } 330: 331: fireTreeNodesChanged(this, parentPath, ci, c); 332: } 333: } 334: 335: /** 336: * Invoked this to insert newChild at location index in parents children. 337: * This will then message nodesWereInserted to create the appropriate event. 338: * This is the preferred way to add children as it will create the 339: * appropriate event. 340: * 341: * @param newChild is the node to add to the parent's children 342: * @param parent is the parent of the newChild 343: * @param index is the index of the newChild 344: */ 345: public void insertNodeInto(MutableTreeNode newChild, MutableTreeNode parent, 346: int index) 347: { 348: newChild.setParent(parent); 349: parent.insert(newChild, index); 350: int[] childIndices = new int[1]; 351: childIndices[0] = index; 352: nodesWereInserted(parent, childIndices); 353: } 354: 355: /** 356: * Message this to remove node from its parent. This will message 357: * nodesWereRemoved to create the appropriate event. This is the preferred 358: * way to remove a node as it handles the event creation for you. 359: * 360: * @param node to be removed 361: */ 362: public void removeNodeFromParent(MutableTreeNode node) 363: { 364: TreeNode parent = node.getParent(); 365: Object[] children = new Object[1]; 366: children[0] = node; 367: int[] childIndices = new int[1]; 368: childIndices[0] = getIndexOfChild(parent, node); 369: node.removeFromParent(); 370: nodesWereRemoved(parent, childIndices, children); 371: } 372: 373: /** 374: * Invoke this method after you've changed how node is to be represented 375: * in the tree. 376: * 377: * @param node that was changed 378: */ 379: public void nodeChanged(TreeNode node) 380: { 381: TreeNode parent = node.getParent(); 382: int[] childIndices = new int[1]; 383: childIndices[0] = getIndexOfChild(parent, node); 384: Object[] children = new Object[1]; 385: children[0] = node; 386: fireTreeNodesChanged(this, getPathToRoot(node), childIndices, children); 387: } 388: 389: /** 390: * Invoke this method after you've inserted some TreeNodes 391: * into node. childIndices should be the index of the new elements and must 392: * be sorted in ascending order. 393: * 394: * @param parent that had a child added to 395: * @param childIndices of the children added 396: */ 397: public void nodesWereInserted(TreeNode parent, int[] childIndices) 398: { 399: Object[] children = new Object[childIndices.length]; 400: for (int i = 0; i < children.length; i++) 401: children[i] = getChild(parent, childIndices[i]); 402: fireTreeNodesInserted(this, getPathToRoot(parent), childIndices, children); 403: } 404: 405: /** 406: * Invoke this method after you've removed some TreeNodes from node. 407: * childIndices should be the index of the removed elements and 408: * must be sorted in ascending order. And removedChildren should be the 409: * array of the children objects that were removed. 410: * 411: * @param parent that had a child added to 412: * @param childIndices of the children added 413: * @param removedChildren are all the children removed from parent. 414: */ 415: public void nodesWereRemoved(TreeNode parent, int[] childIndices, 416: Object[] removedChildren) 417: { 418: fireTreeNodesRemoved(this, getPathToRoot(parent), childIndices, 419: removedChildren); 420: } 421: 422: /** 423: * Invoke this method after you've changed how the children identified by 424: * childIndices are to be represented in the tree. 425: * 426: * @param node that is the parent of the children that changed in a tree. 427: * @param childIndices are the child nodes that changed. 428: */ 429: public void nodesChanged(TreeNode node, int[] childIndices) 430: { 431: Object[] children = new Object[childIndices.length]; 432: for (int i = 0; i < children.length; i++) 433: children[i] = getChild(node, childIndices[i]); 434: fireTreeNodesChanged(this, getPathToRoot(node), childIndices, children); 435: } 436: 437: /** 438: * Invoke this method if you've totally changed the children of node and 439: * its childrens children. This will post a treeStructureChanged event. 440: * 441: * @param node that had its children and grandchildren changed. 442: */ 443: public void nodeStructureChanged(TreeNode node) 444: { 445: int n = getChildCount(root); 446: int[] childIdx = new int[n]; 447: Object[] children = new Object[n]; 448: 449: for (int i = 0; i < n; i++) 450: { 451: childIdx[i] = i; 452: children[i] = getChild(root, i); 453: } 454: 455: fireTreeStructureChanged(this, new Object[] { root }, childIdx, children); 456: } 457: 458: /** 459: * Builds the parents of node up to and including the root node, where 460: * the original node is the last element in the returned array. The 461: * length of the returned array gives the node's depth in the tree. 462: * 463: * @param node - the TreeNode to get the path for 464: * @return TreeNode[] - the path from node to the root 465: */ 466: public TreeNode[] getPathToRoot(TreeNode node) 467: { 468: return getPathToRoot(node, 0); 469: } 470: 471: /** 472: * Builds the parents of node up to and including the root node, where 473: * the original node is the last element in the returned array. The 474: * length of the returned array gives the node's depth in the tree. 475: * 476: * @param node - the TreeNode to get the path for 477: * @param depth - an int giving the number of steps already taken 478: * towards the root (on recursive calls), used to size the returned array 479: * @return an array of TreeNodes giving the path from the root to the 480: * specified node 481: */ 482: protected TreeNode[] getPathToRoot(TreeNode node, int depth) 483: { 484: if (node == null) 485: { 486: if (depth == 0) 487: return null; 488: 489: return new TreeNode[depth]; 490: } 491: 492: TreeNode[] path = getPathToRoot(node.getParent(), depth + 1); 493: path[path.length - depth - 1] = node; 494: return path; 495: } 496: 497: /** 498: * Registers a listere to the model. 499: * 500: * @param listener the listener to add 501: */ 502: public void addTreeModelListener(TreeModelListener listener) 503: { 504: listenerList.add(TreeModelListener.class, listener); 505: } 506: 507: /** 508: * Removes a listener from the model. 509: * 510: * @param listener the listener to remove 511: */ 512: public void removeTreeModelListener(TreeModelListener listener) 513: { 514: listenerList.remove(TreeModelListener.class, listener); 515: } 516: 517: /** 518: * Returns all registered <code>TreeModelListener</code> listeners. 519: * 520: * @return an array of listeners. 521: * 522: * @since 1.4 523: */ 524: public TreeModelListener[] getTreeModelListeners() 525: { 526: return (TreeModelListener[]) listenerList 527: .getListeners(TreeModelListener.class); 528: } 529: 530: /** 531: * Notifies all listeners that have registered interest for notification 532: * on this event type. The event instance is lazily created using the parameters 533: * passed into the fire method. 534: * 535: * @param source the node being changed 536: * @param path the path to the root node 537: * @param childIndices the indices of the changed elements 538: * @param children the changed elements 539: */ 540: protected void fireTreeNodesChanged(Object source, Object[] path, 541: int[] childIndices, Object[] children) 542: { 543: TreeModelEvent event = new TreeModelEvent(source, path, childIndices, 544: children); 545: 546: TreeModelListener[] listeners = getTreeModelListeners(); 547: 548: for (int i = listeners.length - 1; i >= 0; --i) 549: listeners[i].treeNodesChanged(event); 550: } 551: 552: /** 553: * fireTreeNodesInserted 554: * 555: * @param source the node where new nodes got inserted 556: * @param path the path to the root node 557: * @param childIndices the indices of the new elements 558: * @param children the new elements 559: */ 560: protected void fireTreeNodesInserted(Object source, Object[] path, 561: int[] childIndices, Object[] children) 562: { 563: TreeModelEvent event = new TreeModelEvent(source, path, childIndices, 564: children); 565: TreeModelListener[] listeners = getTreeModelListeners(); 566: 567: for (int i = listeners.length - 1; i >= 0; --i) 568: listeners[i].treeNodesInserted(event); 569: } 570: 571: /** 572: * fireTreeNodesRemoved 573: * 574: * @param source the node where nodes got removed- 575: * @param path the path to the root node 576: * @param childIndices the indices of the removed elements 577: * @param children the removed elements 578: */ 579: protected void fireTreeNodesRemoved(Object source, Object[] path, 580: int[] childIndices, Object[] children) 581: { 582: TreeModelEvent event = new TreeModelEvent(source, path, childIndices, 583: children); 584: TreeModelListener[] listeners = getTreeModelListeners(); 585: 586: for (int i = listeners.length - 1; i >= 0; --i) 587: listeners[i].treeNodesRemoved(event); 588: } 589: 590: /** 591: * fireTreeStructureChanged 592: * 593: * @param source the node where the model has changed 594: * @param path the path to the root node 595: * @param childIndices the indices of the affected elements 596: * @param children the affected elements 597: */ 598: protected void fireTreeStructureChanged(Object source, Object[] path, 599: int[] childIndices, Object[] children) 600: { 601: TreeModelEvent event = new TreeModelEvent(source, path, childIndices, 602: children); 603: TreeModelListener[] listeners = getTreeModelListeners(); 604: 605: for (int i = listeners.length - 1; i >= 0; --i) 606: listeners[i].treeStructureChanged(event); 607: } 608: 609: /** 610: * Returns the registered listeners of a given type. 611: * 612: * @param listenerType the listener type to return 613: * 614: * @return an array of listeners 615: * 616: * @since 1.3 617: */ 618: public <T extends EventListener> T[] getListeners(Class<T> listenerType) 619: { 620: return listenerList.getListeners(listenerType); 621: } 622: }
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