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1
18 package org.apache.beehive.netui.tags.tree;
19
20 import org.apache.beehive.netui.util.internal.InternalStringBuilder;
21
22 import org.apache.beehive.netui.pageflow.interceptor.InterceptorChain;
23 import org.apache.beehive.netui.pageflow.interceptor.InterceptorException;
24 import org.apache.beehive.netui.pageflow.interceptor.request.RequestInterceptor;
25 import org.apache.beehive.netui.pageflow.interceptor.request.RequestInterceptorContext;
26 import org.apache.beehive.netui.pageflow.requeststate.INameable;
27 import org.apache.beehive.netui.pageflow.requeststate.NameService;
28 import org.apache.beehive.netui.tags.rendering.AbstractRenderAppender;
29 import org.apache.beehive.netui.tags.rendering.StringBuilderRenderAppender;
30 import org.apache.beehive.netui.util.logging.Logger;
31
32 import javax.servlet.ServletContext  ;
33 import javax.servlet.ServletResponse ;
34 import javax.servlet.http.HttpServletRequest ;
35 import javax.servlet.http.HttpServletResponse ;
36 import javax.servlet.jsp.JspException ;
37 import java.io.IOException ;
38 import java.io.Writer ;
39
40 public class TreeCRI extends RequestInterceptor
41 {
42 private static final String TREE_COLLAPSE = "treeCollapse";
43 private static final String TREE_EXPAND = "treeExpand";
44
45 private static final Logger logger = Logger.getInstance(TreeCRI.class);
46
47 private static final String TREE_EXPAND_ELEM = "treeExpand";
49
50 public void preRequest(RequestInterceptorContext ctxt, InterceptorChain chain) throws InterceptorException
51 {
52 HttpServletRequest request = ctxt.getRequest();
53
54 String cmd = request.getRequestURI();
56
57 try {
59 int dot = cmd.lastIndexOf('.');
60 int slash = cmd.lastIndexOf('/');
61 if (slash != -1 && slash != -1) {
62 cmd = cmd.substring(slash + 1, dot);
63 }
64 }
65 catch (RuntimeException e) {
66 System.err.println("Runtime Error creating XmlRequestServlet Command:" + e.getClass().getName());
67 }
68
69 if (TREE_COLLAPSE.equals(cmd)) {
71 handleExpandCollapse(false, request, ctxt.getResponse(), ctxt.getServletContext());
72 }
73 else if (TREE_EXPAND.equals(cmd)) {
74 handleExpandCollapse(true, request, ctxt.getResponse(), ctxt.getServletContext());
75 }
76
77 chain.continueChain();
78 }
79
80 public void postRequest(RequestInterceptorContext context, InterceptorChain chain) throws InterceptorException
81 {
82 chain.continueChain();
83 }
84
85 private void handleExpandCollapse(boolean expand, HttpServletRequest req, ServletResponse response,
86 ServletContext ctxt)
87 {
88 String tree = req.getParameter("tree");
89 String node = req.getParameter("node");
90 String expandSvr = req.getParameter("expandOnServer");
91
94 NameService ns = NameService.instance(req.getSession());
95 assert(ns != null);
96
97 INameable n = ns.get(tree);
99 if (n == null) {
100 logger.error("Tree '" + tree + "' was not found in the NameService");
101 return;
102 }
103 if (!(n instanceof ITreeRootElement)) {
104 logger.error("Named Tree was not an instance of a ITreeRootElement");
105 return;
106 }
107
108 ITreeRootElement root = (ITreeRootElement) n;
109 TreeElement elem = ((TreeElement) root).findNode(node);
110 if (elem == null) {
111 System.err.println("Element '" + node + "' not found in the tree");
112 return;
113 }
114 elem.onExpand(req, response);
115 elem.setExpanded(expand);
116
117 if (expandSvr != null) {
118 InternalStringBuilder sb = new InternalStringBuilder(1024);
119 StringBuilderRenderAppender writer = new StringBuilderRenderAppender(sb);
120 writeStartElement(writer, TREE_EXPAND_ELEM);
122
123 writeElement(writer, "node", node);
125 writeElement(writer, "treeId", tree);
126
127 try {
128 TreeElement children[] = elem.getChildren();
129 AttributeRenderer extraAttrs = new AttributeRenderer();
130 int newLevel = elem.getLevel() + 1;
131 InternalStringBuilder treeRendering = new InternalStringBuilder();
132 TreeElement tmp = elem;
133 InheritableState iState = null;
134 while (iState == null && tmp != null) {
135 iState = tmp.getInheritableState();
136 tmp = tmp.getParent();
137 }
138 if (iState == null) {
139 System.err.println("Unable to find InheritableState");
140 iState = root.getInheritableState();
141 }
142
143 ServletTreeRenderer str = new ServletTreeRenderer(root.getTreeRenderState(), req,
144 (HttpServletResponse ) response, ctxt, writer, treeRendering);
145 for (int i = 0; i < children.length; i++) {
146 treeRendering.setLength(0);
147 str.render(treeRendering, children[i], newLevel, extraAttrs, iState);
148 }
149 }
150 catch (JspException se) {
151 se.printStackTrace();
152 logger.error("Received a JSP excpetion Rendering the Tree", se);
153 return;
154 }
155 catch (RuntimeException re) {
156 logger.error("Received a JSP excpetion Rendering the Tree", re);
158 return;
159 }
160
161 writeEndElement(writer, TREE_EXPAND_ELEM);
163 write(response, sb.toString());
164 }
165 }
166
167 public static void writeStartElement(AbstractRenderAppender writer, String elementName)
168 {
169 writer.append("<");
170 writer.append(elementName);
171 writer.append(">");
172
173 }
174
175 public static void writeEndElement(AbstractRenderAppender writer, String elementName)
176 {
177 writer.append("</");
178 writer.append(elementName);
179 writer.append(">");
180 }
181
182 public static void writeElement(AbstractRenderAppender writer, String elementName, String value)
183 {
184 writeStartElement(writer, elementName);
185 writer.append(value);
186 writeEndElement(writer, elementName);
187
188 }
189
190 private void write(ServletResponse response, String string)
191 {
192 try {
193 Writer writer = response.getWriter();
194 writer.write(string);
195 }
196 catch (IOException e) {
197 }
198 }
199 }
200 |
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