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1
22
23 package org.xquark.servlet.fusion;
24
25 import java.io.File  ;
26 import java.io.IOException ;
27 import java.io.PrintWriter ;
28 import java.net.MalformedURLException ;
29 import java.util.HashMap ;
30
31 import javax.servlet.ServletConfig ;
32 import javax.servlet.ServletContext ;
33 import javax.servlet.ServletException ;
34 import javax.servlet.http.HttpServlet ;
35 import javax.servlet.http.HttpServletRequest ;
36 import javax.servlet.http.HttpServletResponse ;
37 import javax.xml.parsers.SAXParserFactory ;
38
39 import org.xml.sax.SAXException ;
40 import org.xml.sax.helpers.AttributesImpl ;
41 import org.xquark.mediator.Mediator;
42 import org.xquark.serialize.XMLSerializer;
43 import org.xquark.xml.xdbc.*;
44
45 public class XQFusionServlet extends HttpServlet {
46
47 private static final String JNDI_SOURCE = "java:comp/env/jdbc/TestDB";
48 private Mediator mediator;
49 private SAXParserFactory factory;
50 private HashMap mappings;
51 private ServletContext context = null;
52
53 public void init(ServletConfig config) throws ServletException {
54 super.init(config);
55 context = config.getServletContext();
56 factory = SAXParserFactory.newInstance();
57 factory.setNamespaceAware(true);
58 File configFile = new File (config.getServletContext().getRealPath("WEB-INF/queries/main.xml"));
59 try {
60 mediator = new Mediator(configFile.toURL().toString());
61 } catch (MalformedURLException e) {
62 throw new ServletException ("Could not create mediator", e);
63 } catch (XMLDBCException e) {
64 throw new ServletException ("Could not create mediator", e);
65 }
66 }
67
68 public void doGet(HttpServletRequest request, HttpServletResponse response)
69 throws ServletException , IOException
70 {
71 long t0 = System.currentTimeMillis();
72 PrintWriter out = response.getWriter();
73 XMLConnection conn = null;
74 try {
75 String query = request.getParameter("exec");
76 if (query != null) {
77 conn = mediator.getConnection();
78 execQuery(conn, query, out);
79 }
80 else {
81 reportError(
82 response,
83 "Unrecognized command: <B>"
84 + request.getContextPath()
85 + request.getServletPath()
86 + request.getQueryString()
87 + "</B>.",
88 "query.jsp");
89 return;
90 }
91 }
92 catch (XMLDBCException e) {
93 reportException(response, e, "query.jsp");
94 }
95 finally {
96 out.close();
97 if (conn != null)
98 try {
99 conn.close();
100 } catch (XMLDBCException e) {
101 }
103 context.log("Request processed in "+(System.currentTimeMillis()-t0)+" ms.");
104 }
105 }
106
107 private void execQuery(XMLConnection conn, String query, PrintWriter out)
108 throws ServletException , XMLDBCException {
109 PreparedXMLStatement stmt = null;
110 XMLResultSet xrs = null;
111 try {
112 stmt = conn.prepareStatement(query);
113 xrs = stmt.executeQuery();
114 XMLSerializer serializer = new XMLSerializer(out, "iso-8859-1");
115 xrs.setContentHandler(serializer);
116 xrs.setLexicalHandler(serializer);
117 serializer.startDocument();
118 serializer.startElement(
120 "",
121 "results",
122 "results",
123 new AttributesImpl ());
124 while (xrs.hasNext())
125 xrs.nextAsSAX();
126 serializer.endElement("", "results", "results");
127 serializer.endDocument();
128 } catch (SAXException e) {
129 throw new ServletException ("Error while producing document result", e);
130 }
131 finally {
132 if (xrs != null)
133 xrs.close();
134 if (stmt != null)
135 stmt.close();
136 }
137 }
138
139 private void reportMessage(
140 HttpServletResponse response,
141 String message,
142 String url)
143 throws IOException {
144 response.sendRedirect(
145 response.encodeRedirectURL(
146 "info.jsp?url=" + url + "&message=" + message));
147 }
148
149 private void reportError(
150 HttpServletResponse response,
151 String error,
152 String url)
153 throws IOException {
154 response.sendRedirect(
155 response.encodeRedirectURL(
156 "error.jsp?url=" + url + "&message=" + error));
157 }
158
159 private void reportException(
160 HttpServletResponse response,
161 Exception e,
162 String url)
163 throws IOException {
164
170 PrintWriter out = response.getWriter();
171 out.println("<html><body><pre>");
172 e.printStackTrace(out);
173 out.println("</pre></body></html>");
174 }
175 }
176 |
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