Source Code Cross Referenced for SwallowingHttpServletResponse.java in  » Ajax » dwr » org » directwebremoting » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » dwr » org.directwebremoting.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2005 Joe Walker
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *     http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:        package org.directwebremoting.util;
017:
018:        import java.io.IOException;
019:        import java.io.PrintWriter;
020:        import java.io.Writer;
021:        import java.util.Locale;
022:
023:        import javax.servlet.ServletOutputStream;
024:        import javax.servlet.http.Cookie;
025:        import javax.servlet.http.HttpServletResponse;
026:        import javax.servlet.http.HttpServletResponseWrapper;
027:
028:        import org.apache.commons.logging.LogFactory;
029:        import org.apache.commons.logging.Log;
030:
031:        /**
032:         * Used by ExecutionContext to forward results back via javascript.
033:         * <p>We could like to implement {@link HttpServletResponse}, but there is a bug
034:         * in WebLogic where it casts to a {@link HttpServletResponseWrapper} so we
035:         * need to extend that.
036:         * @author Joe Walker [joe at getahead dot ltd dot uk]
037:         */
038:        public final class SwallowingHttpServletResponse extends
039:                HttpServletResponseWrapper implements  HttpServletResponse {
040:            /**
041:             * Create a new HttpServletResponse that allows you to catch the body
042:             * @param response The original HttpServletResponse
043:             * @param sout The place we copy responses to
044:             * @param characterEncoding The output encoding
045:             */
046:            public SwallowingHttpServletResponse(HttpServletResponse response,
047:                    Writer sout, String characterEncoding) {
048:                super (response);
049:
050:                pout = new PrintWriter(sout);
051:                outputStream = new WriterOutputStream(sout, characterEncoding);
052:
053:                this .characterEncoding = characterEncoding;
054:            }
055:
056:            /* (non-Javadoc)
057:             * @see javax.servlet.http.HttpServletResponseWrapper#addCookie(javax.servlet.http.Cookie)
058:             */
059:            @Override
060:            public void addCookie(Cookie cookie) {
061:            }
062:
063:            /* (non-Javadoc)
064:             * @see javax.servlet.http.HttpServletResponseWrapper#addDateHeader(java.lang.String, long)
065:             */
066:            @Override
067:            public void addDateHeader(String name, long value) {
068:            }
069:
070:            /* (non-Javadoc)
071:             * @see javax.servlet.http.HttpServletResponseWrapper#addHeader(java.lang.String, java.lang.String)
072:             */
073:            @Override
074:            public void addHeader(String name, String value) {
075:            }
076:
077:            /* (non-Javadoc)
078:             * @see javax.servlet.http.HttpServletResponseWrapper#addIntHeader(java.lang.String, int)
079:             */
080:            @Override
081:            public void addIntHeader(String name, int value) {
082:            }
083:
084:            /* (non-Javadoc)
085:             * @see javax.servlet.http.HttpServletResponseWrapper#containsHeader(java.lang.String)
086:             */
087:            @Override
088:            public boolean containsHeader(String name) {
089:                return false;
090:            }
091:
092:            /**
093:             * @see javax.servlet.http.HttpServletResponseWrapper#encodeRedirectUrl(java.lang.String)
094:             * @deprecated
095:             */
096:            @Override
097:            @Deprecated
098:            public String encodeRedirectUrl(String url) {
099:                return url;
100:            }
101:
102:            /* (non-Javadoc)
103:             * @see javax.servlet.http.HttpServletResponseWrapper#encodeRedirectURL(java.lang.String)
104:             */
105:            @Override
106:            public String encodeRedirectURL(String url) {
107:                return url;
108:            }
109:
110:            /**
111:             * @see javax.servlet.http.HttpServletResponseWrapper#encodeUrl(java.lang.String)
112:             * @deprecated
113:             */
114:            @Override
115:            @Deprecated
116:            public String encodeUrl(String url) {
117:                return url;
118:            }
119:
120:            /* (non-Javadoc)
121:             * @see javax.servlet.http.HttpServletResponseWrapper#encodeURL(java.lang.String)
122:             */
123:            @Override
124:            public String encodeURL(String url) {
125:                return url;
126:            }
127:
128:            /* (non-Javadoc)
129:             * @see javax.servlet.ServletResponseWrapper#flushBuffer()
130:             */
131:            @Override
132:            public void flushBuffer() throws IOException {
133:                pout.flush();
134:            }
135:
136:            /* (non-Javadoc)
137:             * @see javax.servlet.ServletResponseWrapper#getBufferSize()
138:             */
139:            @Override
140:            public int getBufferSize() {
141:                return bufferSize;
142:            }
143:
144:            /* (non-Javadoc)
145:             * @see javax.servlet.ServletResponseWrapper#getCharacterEncoding()
146:             */
147:            @Override
148:            public String getCharacterEncoding() {
149:                return characterEncoding;
150:            }
151:
152:            /**
153:             * @return The MIME type of the content
154:             * @see javax.servlet.ServletResponse#setContentType(String)
155:             */
156:            @Override
157:            public String getContentType() {
158:                return contentType;
159:            }
160:
161:            /**
162:             * Accessor for any error messages set using {@link #sendError(int)} or
163:             * {@link #sendError(int, String)}
164:             * @return The current error message
165:             */
166:            public String getErrorMessage() {
167:                return errorMessage;
168:            }
169:
170:            /* (non-Javadoc)
171:             * @see javax.servlet.ServletResponseWrapper#getLocale()
172:             */
173:            @Override
174:            public Locale getLocale() {
175:                return locale;
176:            }
177:
178:            /* (non-Javadoc)
179:             * @see javax.servlet.ServletResponseWrapper#getOutputStream()
180:             */
181:            @Override
182:            public ServletOutputStream getOutputStream() {
183:                return outputStream;
184:            }
185:
186:            /**
187:             * Accessor for the redirect URL set using {@link #sendRedirect(String)}
188:             * @return The redirect URL
189:             */
190:            public String getRedirectedUrl() {
191:                return redirectedUrl;
192:            }
193:
194:            /**
195:             * What HTTP status code should be returned?
196:             * @return The current http status code
197:             */
198:            public int getStatus() {
199:                return status;
200:            }
201:
202:            /* (non-Javadoc)
203:             * @see javax.servlet.ServletResponseWrapper#getWriter()
204:             */
205:            @Override
206:            public PrintWriter getWriter() {
207:                return pout;
208:            }
209:
210:            /* (non-Javadoc)
211:             * @see javax.servlet.ServletResponseWrapper#isCommitted()
212:             */
213:            @Override
214:            public boolean isCommitted() {
215:                return false;
216:            }
217:
218:            /* (non-Javadoc)
219:             * @see javax.servlet.ServletResponseWrapper#reset()
220:             */
221:            @Override
222:            public void reset() {
223:            }
224:
225:            /* (non-Javadoc)
226:             * @see javax.servlet.ServletResponseWrapper#resetBuffer()
227:             */
228:            @Override
229:            public void resetBuffer() {
230:            }
231:
232:            /* (non-Javadoc)
233:             * @see javax.servlet.http.HttpServletResponseWrapper#sendError(int)
234:             */
235:            @Override
236:            public void sendError(int newStatus) {
237:                if (committed) {
238:                    throw new IllegalStateException(
239:                            "Cannot set error status - response is already committed");
240:                }
241:
242:                log.warn("Ignoring call to sendError(" + newStatus + ')');
243:
244:                status = newStatus;
245:                committed = true;
246:            }
247:
248:            /* (non-Javadoc)
249:             * @see javax.servlet.http.HttpServletResponseWrapper#sendError(int, java.lang.String)
250:             */
251:            @Override
252:            public void sendError(int newStatus, String newErrorMessage) {
253:                if (committed) {
254:                    throw new IllegalStateException(
255:                            "Cannot set error status - response is already committed");
256:                }
257:
258:                log.warn("Ignoring call to sendError(" + newStatus + ", "
259:                        + newErrorMessage + ')');
260:
261:                status = newStatus;
262:                errorMessage = newErrorMessage;
263:                committed = true;
264:            }
265:
266:            /* (non-Javadoc)
267:             * @see javax.servlet.http.HttpServletResponseWrapper#sendRedirect(java.lang.String)
268:             */
269:            @Override
270:            public void sendRedirect(String location) {
271:                if (committed) {
272:                    throw new IllegalStateException(
273:                            "Cannot send redirect - response is already committed");
274:                }
275:
276:                log.warn("Ignoring call to sendRedirect(" + location + ')');
277:
278:                redirectedUrl = location;
279:                committed = true;
280:            }
281:
282:            /* (non-Javadoc)
283:             * @see javax.servlet.ServletResponseWrapper#setBufferSize(int)
284:             */
285:            @Override
286:            public void setBufferSize(int bufferSize) {
287:                this .bufferSize = bufferSize;
288:            }
289:
290:            /**
291:             * @param characterEncoding The new encoding to use for response strings
292:             * @see javax.servlet.ServletResponseWrapper#getCharacterEncoding()
293:             */
294:            @Override
295:            public void setCharacterEncoding(String characterEncoding) {
296:                this .characterEncoding = characterEncoding;
297:            }
298:
299:            /* (non-Javadoc)
300:             * @see javax.servlet.ServletResponseWrapper#setContentLength(int)
301:             */
302:            @Override
303:            public void setContentLength(int i) {
304:                // The content length of the original document is not likely to be the
305:                // same as the content length of the new document.
306:            }
307:
308:            /* (non-Javadoc)
309:             * @see javax.servlet.ServletResponseWrapper#setContentType(java.lang.String)
310:             */
311:            @Override
312:            public void setContentType(String contentType) {
313:                this .contentType = contentType;
314:            }
315:
316:            /* (non-Javadoc)
317:             * @see javax.servlet.http.HttpServletResponseWrapper#setDateHeader(java.lang.String, long)
318:             */
319:            @Override
320:            public void setDateHeader(String name, long value) {
321:            }
322:
323:            /* (non-Javadoc)
324:             * @see javax.servlet.http.HttpServletResponseWrapper#setHeader(java.lang.String, java.lang.String)
325:             */
326:            @Override
327:            public void setHeader(String name, String value) {
328:            }
329:
330:            /* (non-Javadoc)
331:             * @see javax.servlet.http.HttpServletResponseWrapper#setIntHeader(java.lang.String, int)
332:             */
333:            @Override
334:            public void setIntHeader(String name, int value) {
335:            }
336:
337:            /* (non-Javadoc)
338:             * @see javax.servlet.ServletResponseWrapper#setLocale(java.util.Locale)
339:             */
340:            @Override
341:            public void setLocale(Locale locale) {
342:                this .locale = locale;
343:            }
344:
345:            /* (non-Javadoc)
346:             * @see javax.servlet.http.HttpServletResponseWrapper#setStatus(int)
347:             */
348:            @Override
349:            public void setStatus(int status) {
350:                this .status = status;
351:                log.warn("Ignoring call to setStatus(" + status + ')');
352:            }
353:
354:            /**
355:             * @see javax.servlet.http.HttpServletResponse#setStatus(int, java.lang.String)
356:             * @deprecated
357:             */
358:            @Deprecated
359:            @Override
360:            public void setStatus(int newStatus, String newErrorMessage) {
361:                status = newStatus;
362:                errorMessage = newErrorMessage;
363:                log.warn("Ignoring call to setStatus(" + newStatus + ", "
364:                        + newErrorMessage + ')');
365:            }
366:
367:            /**
368:             * The ignored buffer size
369:             */
370:            private int bufferSize = 0;
371:
372:            /**
373:             * The character encoding used
374:             */
375:            private String characterEncoding;
376:
377:            /**
378:             * Has the response been comitted
379:             */
380:            private boolean committed = false;
381:
382:            /**
383:             * The MIME type of the output body
384:             */
385:            private String contentType = null;
386:
387:            /**
388:             * The error message sent with a status != HttpServletResponse.SC_OK
389:             */
390:            private String errorMessage = null;
391:
392:            /**
393:             * Locale setting: defaults to platform default
394:             */
395:            private Locale locale = Locale.getDefault();
396:
397:            /**
398:             * The forwarding output stream
399:             */
400:            private final ServletOutputStream outputStream;
401:
402:            /**
403:             * The forwarding output stream
404:             */
405:            private final PrintWriter pout;
406:
407:            /**
408:             * Where are we to redirect the user to?
409:             */
410:            private String redirectedUrl = null;
411:
412:            /**
413:             * The HTTP status
414:             */
415:            private int status = HttpServletResponse.SC_OK;
416:
417:            /**
418:             * The log stream
419:             */
420:            private static final Log log = LogFactory
421:                    .getLog(SwallowingHttpServletResponse.class);
422:        }
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