Source Code Cross Referenced for Request.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.util.List;
018:        import java.util.Locale;
019:
020:        /**
021:         * Generic version of {@link javax.servlet.http.HttpServletRequest}, used to encapsulate the
022:         * Servlet API version, and to help bridge the differences between Servlet API and Porlet API.
023:         */
024:        public interface Request {
025:            /**
026:             * Gets the {@link Session}. If create is false and the session has not be created previously,
027:             * returns null.
028:             * 
029:             * @param create
030:             *            true to force the creation of the session
031:             * @return the session (or null if create is false the session has not been previously created)
032:             */
033:            Session getSession(boolean create);
034:
035:            /**
036:             * Returns the context path. This always starts with a "/" character and does not end with one,
037:             * with the exception of servlets in the root context, which return the empty string.
038:             */
039:            String getContextPath();
040:
041:            /** Returns a list of query parameter names, in alphabetical order. */
042:            List<String> getParameterNames();
043:
044:            /**
045:             * Returns the query parameter value for the given name. Returns null if no such parameter is in
046:             * the request. For a multi-valued parameter, returns just the first value.
047:             */
048:            String getParameter(String name);
049:
050:            /**
051:             * Returns the parameter values for the given name. Returns null if no such parameter is in the
052:             * request.
053:             * <p>
054:             * TODO: Shouldn't this move to {@link FormParameterLookup}?
055:             */
056:            String[] getParameters(String name);
057:
058:            /**
059:             * Returns the path portion of the request, which starts with a "/" and contains everything up
060:             * to the start of the query parameters. It doesn't include the context path.
061:             */
062:            String getPath();
063:
064:            /** Returns the locale of the client as determined from the request headers. */
065:            Locale getLocale();
066:
067:            /** Returns the names of all headers in the request. */
068:            List<String> getHeaderNames();
069:
070:            /**
071:             * Returns the value of the specified request header as a <code>long</code> value that
072:             * represents a <code>Date</code> object. Use this method with headers that contain dates,
073:             * such as <code>If-Modified-Since</code>.
074:             * <p>
075:             * The date is returned as the number of milliseconds since January 1, 1970 GMT. The header name
076:             * is case insensitive.
077:             * <p>
078:             * If the request did not have a header of the specified name, this method returns -1. If the
079:             * header can't be converted to a date, the method throws an
080:             * <code>IllegalArgumentException</code>.
081:             * 
082:             * @param name
083:             *            a <code>String</code> specifying the name of the header
084:             * @return a <code>long</code> value representing the date specified in the header expressed
085:             *         as the number of milliseconds since January 1, 1970 GMT, or -1 if the named header
086:             *         was not included with the reqest
087:             * @exception IllegalArgumentException
088:             *                If the header value can't be converted to a date
089:             */
090:            long getDateHeader(String name);
091:
092:            /** Returns the named header as a string, or null if not found. */
093:            String getHeader(String name);
094:
095:            /**
096:             * Sets the encoding of the request, which must occur before any parameters for the request are
097:             * read.
098:             * 
099:             * @param requestEncoding
100:             *            charset used when parsing parameters
101:             */
102:            void setEncoding(String requestEncoding);
103:        }
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