Annotation of java/classes/org/w3c/jigsaw/servlet/JigsawRequestDispatcher.java, revision 1.2
1.1 bmahe 1: // JigsawRequestDispatcher.java
1.2 ! bmahe 2: // $Id: JigsawRequestDispatcher.java,v 1.1 1999/03/17 18:01:04 bmahe Exp $
1.1 bmahe 3: // (c) COPYRIGHT MIT, INRIA and Keio, 1999.
4: // Please first read the full copyright statement in file COPYRIGHT.html
5:
6: package org.w3c.jigsaw.servlet;
7:
8: import java.io.IOException;
9: import java.io.InputStream;
10: import java.io.Reader;
11: import java.io.Writer;
12: import java.io.InputStreamReader;
13:
14: import java.net.URL;
15: import java.net.MalformedURLException;
16:
17: import javax.servlet.RequestDispatcher;
18: import javax.servlet.ServletException;
19: import javax.servlet.ServletRequest;
20: import javax.servlet.ServletResponse;
21: import javax.servlet.ServletOutputStream;
22:
23: import org.w3c.jigsaw.http.httpd;
24: import org.w3c.jigsaw.http.Request;
25: import org.w3c.jigsaw.http.Reply;
26:
27: import org.w3c.tools.resources.ResourceReference;
28: import org.w3c.tools.resources.LookupState;
29: import org.w3c.tools.resources.LookupResult;
30: import org.w3c.tools.resources.FramedResource;
31: import org.w3c.tools.resources.ResourceException;
32: import org.w3c.tools.resources.ProtocolException;
33:
34: import org.w3c.www.http.HTTP;
35:
36: /**
1.2 ! bmahe 37: * @version $Revision: 1.1 $
1.1 bmahe 38: * @author Benoît Mahé (bmahe@w3.org)
39: */
40: public class JigsawRequestDispatcher implements RequestDispatcher {
41:
42: private httpd server = null;
43: private String urlpath = null;
44:
45: public void forward(ServletRequest request, ServletResponse response)
46: throws ServletException, IOException
47: {
48: JigsawHttpServletResponse jres = (JigsawHttpServletResponse) response;
49: JigsawHttpServletRequest jreq = (JigsawHttpServletRequest) request;
50: if (jres.isStreamObtained())
51: throw new IllegalStateException("Can't Forward! OutputStream or "+
52: "Writer has allready been obtained.");
53: Request req = jreq.getRequest();
54: String host = req.getHost();
55: try {
56: //update URL...
57: if (host == null)
58: req.setURL(new URL(server.getURL(), urlpath));
59: else
60: req.setURL(new URL(server.getURL().getProtocol(), host,
61: urlpath));
62: } catch (MalformedURLException ex) {
63: //should not occurs
64: }
1.2 ! bmahe 65:
! 66: //do nothing more with this reply
! 67: jres.getReply().setStatus(HTTP.DONE);
1.1 bmahe 68:
69: Reply reply = null;
70: try {
71: reply = (Reply) server.perform(req);
72: } catch (ResourceException ex) {
73: reply = req.makeReply(HTTP.INTERNAL_SERVER_ERROR);
74: reply.setContent(ex.getMessage());
75: } catch (ProtocolException pex) {
76: if (pex.hasReply())
77: reply = (Reply) pex.getReply();
78: else {
79: reply = req.makeReply(HTTP.INTERNAL_SERVER_ERROR);
80: reply.setContent(pex.getMessage());
81: }
82: }
83: //copy reply into response...
1.2 ! bmahe 84: if (reply.hasStream()) {
! 85: jres.getReply().setStatus(reply.getStatus());
! 86: InputStream is = reply.openStream();
1.1 bmahe 87: try {
88: ServletOutputStream out = jres.getOutputStream();
89: byte buffer[] = new byte[512];
90: int len = -1;
91: while((len = is.read(buffer, 0, 512)) != -1)
92: out.write(buffer, 0, len);
93: } catch (IllegalStateException ex) {
94: Writer writer = jres.getWriter();
95: Reader reader = new InputStreamReader(is);
96: char buffer[] = new char[512];
97: int len = -1;
98: while((len = reader.read(buffer, 0, 512)) != -1)
99: writer.write(buffer, 0, len);
100: }
101: }
102: }
103:
104: public void include(ServletRequest request, ServletResponse response)
105: throws ServletException, IOException
106: {
107: JigsawHttpServletResponse jres = (JigsawHttpServletResponse) response;
108: JigsawHttpServletRequest jreq = (JigsawHttpServletRequest) request;
109:
110: Request req = jreq.getRequest();
1.2 ! bmahe 111: String host = req.getHost();
! 112:
1.1 bmahe 113: try {
114: //update URL...
115: if (host == null)
116: req.setURL(new URL(server.getURL(), urlpath));
117: else
118: req.setURL(new URL(server.getURL().getProtocol(), host,
119: urlpath));
120: } catch (MalformedURLException ex) {
121: //should not occurs
122: }
123:
1.2 ! bmahe 124: jres.flushStream(false);
1.1 bmahe 125:
126: Reply reply = null;
127: try {
1.2 ! bmahe 128: req.setState(JigsawHttpServletResponse.INCLUDED, Boolean.TRUE);
1.1 bmahe 129: reply = (Reply) server.perform(req);
130: } catch (ResourceException ex) {
131: reply = req.makeReply(HTTP.INTERNAL_SERVER_ERROR);
132: reply.setContent(ex.getMessage());
133: } catch (ProtocolException pex) {
134: if (pex.hasReply())
135: reply = (Reply) pex.getReply();
136: else {
137: reply = req.makeReply(HTTP.INTERNAL_SERVER_ERROR);
138: reply.setContent(pex.getMessage());
139: }
140: }
1.2 ! bmahe 141:
! 142: if (reply.hasStream()) {
! 143: InputStream is = reply.openStream();
1.1 bmahe 144: try {
145: ServletOutputStream out = jres.getOutputStream();
146: byte buffer[] = new byte[512];
147: int len = -1;
148: while((len = is.read(buffer, 0, 512)) != -1)
149: out.write(buffer, 0, len);
150: } catch (IllegalStateException ex) {
151: Writer writer = jres.getWriter();
152: Reader reader = new InputStreamReader(is);
153: char buffer[] = new char[512];
154: int len = -1;
155: while((len = reader.read(buffer, 0, 512)) != -1)
156: writer.write(buffer, 0, len);
157: }
158: }
159: }
160:
161: protected JigsawRequestDispatcher(String urlpath, httpd server) {
162: this.server = server;
163: this.urlpath = urlpath;
164: }
165:
166: public static RequestDispatcher getRequestDispatcher(String urlpath,
167: httpd server)
168: {
169: ResourceReference rr_root = null;
170: rr_root = server.getRootReference();
171:
172: FramedResource root = null;
173: root = server.getRoot();
174:
175: // Do the lookup:
176: ResourceReference r_target = null;
177: try {
178: LookupState ls = new LookupState(urlpath);
179: LookupResult lr = new LookupResult(rr_root);
180: root.lookup(ls, lr);
181: r_target = lr.getTarget();
182: } catch (Exception ex) {
183: r_target = null;
184: }
185: if (r_target == null)
186: return null;
187: //there is a resource, return the dispatcher...
188: return new JigsawRequestDispatcher(urlpath, server);
189: }
190:
191: }
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