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1
15
16 package com.jdon.strutsutil.treeview;
17
18 import javax.servlet.http.HttpServletRequest  ;
19 import javax.servlet.http.HttpServletResponse ;
20 import javax.servlet.http.HttpSession ;
21 import org.apache.struts.action.Action;
22
23 import org.apache.struts.action.ActionForm;
24 import org.apache.struts.action.ActionForward;
25 import org.apache.struts.action.ActionMapping;
26
27 import com.jdon.util.Debug;
28
29 import java.util.*;
30
31
43
44 public abstract class TreeAction extends Action {
45
46 private final static String module = TreeAction.class.getName();
47
48 public ActionForward execute(ActionMapping mapping,
49 ActionForm form,
50 HttpServletRequest request,
51 HttpServletResponse response) throws
52 Exception {
53
54 TreeControl control = getTreeControl(request);
55 if (control.getRoot() == null) {
56 if (request.getParameterMap().containsKey("init")) { initRoot(request);
58 }else{
59 Debug.logError("[JdonFramework]please init the tree at first !");
60 }
61 } else {
62 refreshTree(request, control);
63 }
64 return (mapping.findForward(TreeControlTag.TREE_NAME));
65 }
66
67
68
78 private TreeControl getTreeControl(HttpServletRequest request) throws
79 Exception {
80 HttpSession session = request.getSession();
81 TreeControl control = (TreeControl) session.getAttribute(TreeControlTag.
82 TREE_NAME);
83 try{
84 if ( (control == null) || (request.getParameterMap().isEmpty())) {
86 Debug.logVerbose("[JdonFramework] get tree from db..", module);
87 ViewNode root = getRootViewNode(request);
88 control = new TreeControl(root);
89 fetchRootChildern(request, root);
90 session.setAttribute(TreeControlTag.TREE_NAME, control);
91 }
92 }catch(Exception ex){
93 Debug.logError("[JdonFramework] getTreeControl error: " + ex, module);
94 }
95 return control;
96 }
97
98
104 private ViewNode getRootViewNode(HttpServletRequest request) throws Exception {
105 String rooNodeID = getRootNodeID(request);
106 if (rooNodeID == null){
107 Debug.logError("[JdonFramework] root Id is null ! " , module);
108 return null;
109 }
110 Debug.logVerbose("[JdonFramework] get the tree's root Node: " + rooNodeID, module);
111 ViewNode rNode = new ViewNode(rooNodeID, rooNodeID, true);
112 rNode.setRoot(true);
113 return rNode;
114 }
115
116 public void fetchRootChildern(HttpServletRequest request, ViewNode root)
117 throws Exception {
118 Collection childernNodeOfRoot = null;
119 try {
120 childernNodeOfRoot = getRootChildern(request);
121
122 Iterator iter = childernNodeOfRoot.iterator();
123 while (iter.hasNext()) {
124 ViewNode nodeChild = (ViewNode) iter.next();
125 root.addChild(nodeChild);
126 }
127 } catch (Exception ex) {
128 Debug.logError(ex, module);
129 throw new Exception (" tree not init ");
130 }
131 }
132
133
139 private void refreshTree(HttpServletRequest request, TreeControl control) throws Exception {
140 String key = request.getParameter("key");
141 if (key != null) {
142 ViewNode node = control.findNode(key);
143 if (node != null) {
144 Debug.logVerbose("[JdonFramework]Found Node: " + key, module);
145 if (!node.isExpanded()) {
146 node.clearChildren();
149 fetchChildern(request, node);
150 }
151 node.setExpanded(!node.isExpanded());
152 } else {
153 Debug.logVerbose("[JdonFramework]Node is null : " + key);
154 }
155 }
156 String select = request.getParameter("select");
158 if (select != null) {
159 control.selectNode(select);
160 }
161
162 }
163
164
165
170 public void fetchChildern(HttpServletRequest request, ViewNode node) {
171 Collection childernNode = null;
172 try {
173 childernNode = getChildern(request, node);
174
175 Iterator iter = childernNode.iterator();
176 while (iter.hasNext()) {
177 ViewNode nodeChild = (ViewNode) iter.next();
178 node.addChild(nodeChild);
179 }
180 } catch (Exception ex) {
181 Debug.logError(ex, module);
182 }
183 }
184
185
186 public abstract Collection getRootChildern(HttpServletRequest request) throws
187 Exception ;
188
189 public abstract String getRootNodeID(HttpServletRequest request) throws Exception ;
190
191 public abstract void initRoot(HttpServletRequest request) throws Exception ;
192
193 public abstract Collection getChildern(HttpServletRequest request,
194 ViewNode node) throws Exception ;
195
196 }
197 |
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