9 import javax.servlet.*;
10 import javax.servlet.http.*;
12 import org.prevayler.*;
13 import org.prevayler.implementation.snapshot.*;
15 public class Servlet extends HttpServlet {
18 private Prevayler prevayler;
20 private ServletContext cx = null;
22 public void destroy() { try {
23 synchronized(this.getClass()) {
24 Prevayler privatePrevayler = prevayler;
25 if (prevayler == null) return;
27 Prevalence.destroy(cx, prevayler);
29 } catch (Exception e) { e.printStackTrace(); } }
31 public void init(ServletConfig sc) throws ServletException {
32 cx = sc.getServletContext();
33 prevayler = Prevalence.getPrevayler(cx);
34 prevalent = (JS)prevayler.prevalentSystem();
37 public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException { doGet(request, response); }
38 public void doGet(HttpServletRequest rq, HttpServletResponse rs) throws IOException {
39 String path = cx.getRealPath(rq.getServletPath());
40 Servlet.Scope scope = new Servlet.Scope(cx, rq, rs, prevayler);
41 try { Template.wrap(Template.parse(path, scope), scope).toXML(rs.getWriter()); }
42 catch (Exception e) { e.printStackTrace(); System.out.println("e = "+e); }
45 public static class Scope extends Template.Scope {
46 private final ServletContext cx;
47 private final HttpServletRequest request;
48 private final HttpServletResponse response;
49 private final Prevayler prevayler;
51 public Scope(ServletContext cx, HttpServletRequest rq, HttpServletResponse rs, Prevayler p) {
52 super(null); this.cx = cx; request = rq; response = rs; prevayler = p;
55 public String getLocalPath() { return cx.getRealPath("/") + "/WEB-INF/"; }
56 public void transaction(JS t) {
57 try { prevayler.execute(new Prevalence.JSTransaction(t)); }
58 catch (Exception e) { e.printStackTrace(); throw new RuntimeException(e); }
61 private JS params = new JS() {
62 public Object get(Object key) { return request.getParameter(JS.toString(key)); }
63 public Enumeration keys() { return request.getParameterNames(); }
65 private JS cookies = new JS() {
67 public Object get(Object key) { return request.getCookie(JS.toString(key)); }
68 public Enumeration keys() { return request.getCookieNames(); }
71 private JS sessionAttributes = new JS() {
72 public Object get(Object key) {
73 return request.getSession(true).getAttribute(JS.toString(key)); }
74 public void put(Object key, Object val) {
75 if (val == null) request.getSession(true).removeAttribute(JS.toString(key));
76 else request.setAttribute(JS.toString(key), val); }
77 public Enumeration keys() { return request.getSession(true).getAttributeNames(); }
79 private JS requestHeader = new JS() {
80 public Object get(Object key) { return request.getHeader(JS.toString(key)); }
81 public Enumeration keys() { return request.getHeaderNames(); }
83 private JS responseHeader = new JS() {
84 public void put(Object key, Object val) {
85 response.setHeader(JS.toString(key), JS.toString(val)); }
89 /** lets us put multi-level get/put/call keys all in the same method */
90 private class Sub extends JS {
92 Sub(Object key) { this.key = key; }
93 public void put(Object key, Object val) throws JSExn {
94 Scope.this.put(JS.toString(this.key) + "." + JS.toString(key), val); }
95 public Object get(Object key) throws JSExn {
96 return Scope.this.get(JS.toString(this.key) + "." + JS.toString(key)); }
97 public Object call(Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
98 return Scope.this.callMethod(this.key, a0, a1, a2, rest, nargs);
100 public Object callMethod(Object method, Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
101 return Scope.this.callMethod(JS.toString(this.key) + "."
102 + JS.toString(method), a0, a1, a2, rest, nargs);
105 private Sub getSub(String key) { return new Sub(key); }
107 public Object callMethod(Object method, final Object a, final Object b, Object c, Object[] rest, int nargs) throws JSExn {
109 case "session.invalidate": request.getSession(true).invalidate(); return null;
111 String path = JS.toString(a);
112 if (path.indexOf("..") != -1) throw new JSExn("cannot use .. in paths");
113 File f = new File(cx.getRealPath("/") + File.separatorChar + path);
114 if (!f.isDirectory()) return null;
115 String[] contents = f.list();
116 JSArray ret = new JSArray(contents.length);
117 for(int i=0; i<contents.length; i++) ret.addElement(contents[i]);
122 public Object get(Object key) throws JSExn {
125 case "arg": return null;
126 case "prevalent": return prevayler.prevalentSystem();
127 case "request": return getSub("request");
128 case "request.user": return request.getRemoteUser();
129 case "request.header": return requestHeader;
130 case "request.method": return request.getMethod();
131 case "request.remote": return getSub("request.remote");
132 case "request.remote.ip": return request.getRemoteAddr();
133 case "request.remote.host": return request.getRemoteHost();
134 case "request.ssl": return new Boolean(request.isSecure());
135 case "request.path": return request.getPathInfo();
136 case "response": return getSub("response");
137 case "response.header": return responseHeader;
138 case "session": return getSub("session");
139 case "session.attr": return sessionAttributes;
140 case "session.created": return new JSDate(request.getSession(true).getCreationTime());
141 case "session.accessed": return new JSDate(request.getSession(true).getLastAccessedTime());
142 case "session.invalidate": return METHOD;
143 case "page": return getSub("page");
144 //case "page.lastmodified": return new JSDate(new File(path).lastModified()); FIXME
145 case "context": return getSub("context");
146 case "context.list": return METHOD;
147 case "params": return params;
148 case "cookie": return cookies;
149 case "xt.date": return new JSDate(); // TODO: discuss
153 public void put(Object key, Object val) throws JSExn {
155 //#switch(JS.toString(key))
156 case "transaction": transaction((JS)val);
157 case "response.code": response.setStatus(JS.toInt(val));
158 case "response.redirect": response.sendRedirect(JS.toString(val));
159 case "response.contentType": response.setContentType(JS.toString(val));
161 } catch (IOException e) {