/*
* Copyright 2005 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* $Header:$
*/
package org.apache.beehive.netui.tags.tree;
import org.apache.beehive.netui.util.internal.InternalStringBuilder;
import org.apache.beehive.netui.pageflow.interceptor.InterceptorChain;
import org.apache.beehive.netui.pageflow.interceptor.InterceptorException;
import org.apache.beehive.netui.pageflow.interceptor.request.RequestInterceptor;
import org.apache.beehive.netui.pageflow.interceptor.request.RequestInterceptorContext;
import org.apache.beehive.netui.pageflow.requeststate.INameable;
import org.apache.beehive.netui.pageflow.requeststate.NameService;
import org.apache.beehive.netui.tags.rendering.AbstractRenderAppender;
import org.apache.beehive.netui.tags.rendering.StringBuilderRenderAppender;
import org.apache.beehive.netui.util.logging.Logger;
import javax.servlet.ServletContext;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspException;
import java.io.IOException;
import java.io.Writer;
public class TreeCRI extends RequestInterceptor
{
private static final String TREE_COLLAPSE = "treeCollapse";
private static final String TREE_EXPAND = "treeExpand";
private static final Logger logger = Logger.getInstance(TreeCRI.class);
// The elements we will create in the document
private static final String TREE_EXPAND_ELEM = "treeExpand";
public void preRequest(RequestInterceptorContext ctxt, InterceptorChain chain) throws InterceptorException
{
HttpServletRequest request = ctxt.getRequest();
// Create the command by striping off the context path and the extension
String cmd = request.getRequestURI();
// catch any runtime errors here and return.
try {
int dot = cmd.lastIndexOf('.');
int slash = cmd.lastIndexOf('/');
if (slash != -1 && slash != -1) {
cmd = cmd.substring(slash + 1, dot);
}
}
catch (RuntimeException e) {
System.err.println("Runtime Error creating XmlRequestServlet Command:" + e.getClass().getName());
}
// check to see if we handle this command
if (TREE_COLLAPSE.equals(cmd)) {
handleExpandCollapse(false, request, ctxt.getResponse(), ctxt.getServletContext());
}
else if (TREE_EXPAND.equals(cmd)) {
handleExpandCollapse(true, request, ctxt.getResponse(), ctxt.getServletContext());
}
chain.continueChain();
}
public void postRequest(RequestInterceptorContext context, InterceptorChain chain) throws InterceptorException
{
chain.continueChain();
}
private void handleExpandCollapse(boolean expand, HttpServletRequest req, ServletResponse response,
ServletContext ctxt)
{
String tree = req.getParameter("tree");
String node = req.getParameter("node");
String expandSvr = req.getParameter("expandOnServer");
//System.err.println("TreeCommand:" + ((expand) ? "expand" : "collapse") +
// " Tree:" + tree + " Node:" + node + " expandSvr:" + expandSvr);
NameService ns = NameService.instance(req.getSession());
assert(ns != null);
// get the tree from the name service
INameable n = ns.get(tree);
if (n == null) {
logger.error("Tree '" + tree + "' was not found in the NameService");
return;
}
if (!(n instanceof ITreeRootElement)) {
logger.error("Named Tree was not an instance of a ITreeRootElement");
return;
}
ITreeRootElement root = (ITreeRootElement) n;
TreeElement elem = ((TreeElement) root).findNode(node);
if (elem == null) {
System.err.println("Element '" + node + "' not found in the tree");
return;
}
elem.onExpand(req, response);
elem.setExpanded(expand);
if (expandSvr != null) {
InternalStringBuilder sb = new InternalStringBuilder(1024);
StringBuilderRenderAppender writer = new StringBuilderRenderAppender(sb);
// Start the document
writeStartElement(writer, TREE_EXPAND_ELEM);
// add a tree identifier
writeElement(writer, "node", node);
writeElement(writer, "treeId", tree);
try {
TreeElement children[] = elem.getChildren();
AttributeRenderer extraAttrs = new AttributeRenderer();
int newLevel = elem.getLevel() + 1;
InternalStringBuilder treeRendering = new InternalStringBuilder();
TreeElement tmp = elem;
InheritableState iState = null;
while (iState == null && tmp != null) {
iState = tmp.getInheritableState();
tmp = tmp.getParent();
}
if (iState == null) {
System.err.println("Unable to find InheritableState");
iState = root.getInheritableState();
}
ServletTreeRenderer str = new ServletTreeRenderer(root.getTreeRenderState(), req,
(HttpServletResponse) response, ctxt, writer, treeRendering);
for (int i = 0; i < children.length; i++) {
treeRendering.setLength(0);
str.render(treeRendering, children[i], newLevel, extraAttrs, iState);
}
}
catch (JspException se) {
se.printStackTrace();
logger.error("Received a JSP excpetion Rendering the Tree", se);
return;
}
catch (RuntimeException re) {
//re.printStackTrace();
logger.error("Received a JSP excpetion Rendering the Tree", re);
return;
}
// add the tree text
writeEndElement(writer, TREE_EXPAND_ELEM);
write(response, sb.toString());
}
}
public static void writeStartElement(AbstractRenderAppender writer, String elementName)
{
writer.append("<");
writer.append(elementName);
writer.append(">");
}
public static void writeEndElement(AbstractRenderAppender writer, String elementName)
{
writer.append("</");
writer.append(elementName);
writer.append(">");
}
public static void writeElement(AbstractRenderAppender writer, String elementName, String value)
{
writeStartElement(writer, elementName);
writer.append(value);
writeEndElement(writer, elementName);
}
private void write(ServletResponse response, String string)
{
try {
Writer writer = response.getWriter();
writer.write(string);
}
catch (IOException e) {
}
}
}