Source Code Cross Referenced for StandardValveContext.java in  » Sevlet-Container » tomcat-catalina » org » apache » catalina » core » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » tomcat catalina » org.apache.catalina.core 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 1999-2001,2004 The Apache Software Foundation.
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:
017:        package org.apache.catalina.core;
018:
019:        import java.io.IOException;
020:        import javax.servlet.ServletException;
021:        import org.apache.catalina.Request;
022:        import org.apache.catalina.Response;
023:        import org.apache.catalina.Valve;
024:        import org.apache.catalina.ValveContext;
025:        import org.apache.catalina.util.StringManager;
026:
027:        /**
028:         * Standard implementation of a <code>ValveContext</code>.
029:         *
030:         * @author Craig R. McClanahan
031:         * @author Remy Maucherat
032:         */
033:
034:        public final class StandardValveContext implements  ValveContext {
035:
036:            // ----------------------------------------------------- Instance Variables
037:
038:            /**
039:             * The string manager for this package.
040:             */
041:            protected static StringManager sm = StringManager
042:                    .getManager(Constants.Package);
043:
044:            protected String info = "org.apache.catalina.core.StandardValveContext/1.0";
045:            protected int stage = 0;
046:            protected Valve basic = null;
047:            protected Valve valves[] = null;
048:
049:            // ------------------------------------------------------------- Properties
050:
051:            /**
052:             * Return descriptive information about this ValveContext 
053:             * implementation.
054:             */
055:            public String getInfo() {
056:                return info;
057:            }
058:
059:            // --------------------------------------------------------- Public Methods
060:
061:            /**
062:             * Cause the <code>invoke()</code> method of the next Valve that is 
063:             * part of the Pipeline currently being processed (if any) to be 
064:             * executed, passing on the specified request and response objects 
065:             * plus this <code>ValveContext</code> instance.  Exceptions thrown by
066:             * a subsequently executed Valve (or a Filter or Servlet at the 
067:             * application level) will be passed on to our caller.
068:             *
069:             * If there are no more Valves to be executed, an appropriate
070:             * ServletException will be thrown by this ValveContext.
071:             *
072:             * @param request The request currently being processed
073:             * @param response The response currently being created
074:             *
075:             * @exception IOException if thrown by a subsequent Valve, Filter, or
076:             *  Servlet
077:             * @exception ServletException if thrown by a subsequent Valve, Filter,
078:             *  or Servlet
079:             * @exception ServletException if there are no further Valves 
080:             *  configured in the Pipeline currently being processed
081:             */
082:            public final void invokeNext(Request request, Response response)
083:                    throws IOException, ServletException {
084:
085:                int subscript = stage;
086:                stage = stage + 1;
087:
088:                // Invoke the requested Valve for the current request thread
089:                if (subscript < valves.length) {
090:                    valves[subscript].invoke(request, response, this );
091:                } else if ((subscript == valves.length) && (basic != null)) {
092:                    basic.invoke(request, response, this );
093:                } else {
094:                    throw new ServletException(sm
095:                            .getString("standardPipeline.noValve"));
096:                }
097:
098:            }
099:
100:            // -------------------------------------------------------- Package Methods
101:
102:            /**
103:             * Reset state.
104:             */
105:            void set(Valve basic, Valve valves[]) {
106:                stage = 0;
107:                this.basic = basic;
108:                this.valves = valves;
109:            }
110:
111:        }
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