Source Code Cross Referenced for Response.java in  » Library » Tapestry » org » apache » tapestry » services » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Tapestry » org.apache.tapestry.services 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // Copyright 2006, 2007 The Apache Software Foundation
002:        //
003:        // Licensed under the Apache License, Version 2.0 (the "License");
004:        // you may not use this file except in compliance with the License.
005:        // You may obtain a copy of the License at
006:        //
007:        //     http://www.apache.org/licenses/LICENSE-2.0
008:        //
009:        // Unless required by applicable law or agreed to in writing, software
010:        // distributed under the License is distributed on an "AS IS" BASIS,
011:        // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012:        // See the License for the specific language governing permissions and
013:        // limitations under the License.
014:
015:        package org.apache.tapestry.services;
016:
017:        import java.io.IOException;
018:        import java.io.OutputStream;
019:        import java.io.PrintWriter;
020:
021:        /**
022:         * API agnostic wrapper for generating a response. Bridges the gaps between the Servlet API and the
023:         * Portlet API.
024:         */
025:        public interface Response {
026:            /**
027:             * Returns a PrintWriter object to which output may be sent. Invoking flush() on the writer will
028:             * commit the output.
029:             * 
030:             * @param contentType
031:             *            the MIME content type for the output, typically "text/html"
032:             */
033:            PrintWriter getPrintWriter(String contentType) throws IOException;
034:
035:            /**
036:             * Returns an OutputStream to which byte-oriented output may be sent. Invoking flush() on the
037:             * stream will commit the output.
038:             * 
039:             * @param contentType
040:             *            the MIME content type for the output, often "application/octet-stream" or
041:             *            "text/plain" or one of several others
042:             */
043:            OutputStream getOutputStream(String contentType) throws IOException;
044:
045:            /**
046:             * Sends a redirect to the client.
047:             * 
048:             * @param URL
049:             *            full or partial (relative) URL to send to the client
050:             * @see #encodeRedirectURL(String)
051:             */
052:            void sendRedirect(String URL) throws IOException;
053:
054:            /**
055:             * Sends an error response to the client using the specified status. The server defaults to
056:             * creating the response to look like an HTML-formatted server error page containing the
057:             * specified message, setting the content type to "text/html", leaving cookies and other headers
058:             * unmodified. If an error-page declaration has been made for the web application corresponding
059:             * to the status code passed in, it will be served back in preference to the suggested msg
060:             * parameter.
061:             * <p>
062:             * If the response has already been committed, this method throws an IllegalStateException.
063:             * After using this method, the response should be considered to be committed and should not be
064:             * written to.
065:             * 
066:             * @param sc
067:             *            the error status code
068:             * @param message
069:             *            the descriptive message
070:             * @exception IOException
071:             *                If an input or output exception occurs
072:             * @exception IllegalStateException
073:             *                If the response was committed
074:             */
075:            void sendError(int sc, String message) throws IOException;
076:
077:            /**
078:             * Sets the length of the content body in the response; this method sets the HTTP Content-Length
079:             * header.
080:             * 
081:             * @param length
082:             *            the length of the content
083:             */
084:            void setContentLength(int length);
085:
086:            /**
087:             * Sets a response header with the given name and date-value. The date is specified in terms of
088:             * milliseconds since the epoch. If the header had already been set, the new value overwrites
089:             * the previous one.
090:             * 
091:             * @param name
092:             *            the name of the header to set
093:             * @param date
094:             *            the assigned date value
095:             */
096:            void setDateHeader(String name, long date);
097:
098:            /**
099:             * Sets a response header with the given name and value. If the header had already been set,
100:             * the new value overwrites the previous one.
101:             * @param name
102:             *            the name of the header to set
103:             * @param value
104:             *            the assigned value
105:             */
106:            void setHeader(String name, String value);
107:
108:            /**
109:             * Sets a response header with the given name and integer value. If the header had already been set,
110:             * the new value overwrites the previous one.
111:             * @param name
112:             *            the name of the header to set
113:             * @param value
114:             *            the assigned integer value
115:             */
116:            void setIntHeader(String name, int value);
117:
118:            /**
119:             * Encodes the URL, ensuring that a session id is included (if a session exists, and as
120:             * necessary depending on the client browser's use of cookies).
121:             * 
122:             * @param URL
123:             * @return the same URL or a different one with additional information to track the user session
124:             */
125:            String encodeURL(String URL);
126:
127:            /**
128:             * Encodes the URL for use as a redirect, ensuring that a session id is included (if a session
129:             * exists, and as necessary depending on the client browser's use of cookies).
130:             * 
131:             * @param URL
132:             * @return the same URL or a different one with additional information to track the user session
133:             */
134:            String encodeRedirectURL(String URL);
135:        }
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