Source Code Cross Referenced for FlowHelper.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » components » flow » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.components.flow 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.cocoon.components.flow;
018:
019:        import org.mozilla.javascript.Undefined;
020:        import org.mozilla.javascript.Wrapper;
021:
022:        import java.util.Map;
023:
024:        /**
025:         * Provides the interface between the flow controller layer and the 
026:         * view layer. A view can obtain the context object sent by a flow
027:         * script and the current web continuation, if any.
028:         */
029:        public class FlowHelper {
030:
031:            // Constants defining keys in the object model used to store the various objects.
032:            // These constants are private so that access to these objects only go through the
033:            // accessors provided below.
034:            //
035:            // These objects are stored in the object model rather than as request attributes,
036:            // as object model is cloned for subrequests (see EnvironmentWrapper), whereas
037:            // request attributes are shared between the "real" request and all of its
038:            // child requests.
039:
040:            /**
041:             * Request attribute name used to store flow context.
042:             */
043:            private static final String CONTEXT_OBJECT = "cocoon.flow.context";
044:
045:            /**
046:             * Request attribute name used to store flow continuation.
047:             */
048:            private static final String CONTINUATION_OBJECT = "cocoon.flow.continuation";
049:
050:            /**
051:             * Get the flow context object associated with the current request
052:             *
053:             * @param objectModel The Cocoon Environment's object model
054:             * @return The context object 
055:             */
056:            public final static Object getContextObject(Map objectModel) {
057:                return objectModel.get(CONTEXT_OBJECT);
058:            }
059:
060:            /**
061:             * Get the web continuation associated with the current request
062:             *
063:             * @param objectModel The Cocoon Environment's object model
064:             * @return The web continuation
065:             */
066:            public final static WebContinuation getWebContinuation(
067:                    Map objectModel) {
068:                return (WebContinuation) objectModel.get(CONTINUATION_OBJECT);
069:            }
070:
071:            /**
072:             * Set the web continuation associated with the current request
073:             *
074:             * @param objectModel The Cocoon Environment's object model
075:             * @param kont The web continuation
076:             */
077:            public final static void setWebContinuation(Map objectModel,
078:                    WebContinuation kont) {
079:                objectModel.put(CONTINUATION_OBJECT, kont);
080:            }
081:
082:            /**
083:             * Set the flow context object associated with the current request
084:             *
085:             * @param objectModel The Cocoon Environment's object model
086:             * @param obj The context object 
087:             */
088:            public final static void setContextObject(Map objectModel,
089:                    Object obj) {
090:                objectModel.put(CONTEXT_OBJECT, obj);
091:            }
092:
093:            /**
094:             * Unwrap a Rhino object (getting the raw java object) and convert undefined to null
095:             * @deprecated Use {@link org.apache.cocoon.components.flow.javascript.JavaScriptFlowHelper#unwrap(Object)}
096:             */
097:            public static Object unwrap(Object obj) {
098:                if (obj instanceof  Wrapper) {
099:                    obj = ((Wrapper) obj).unwrap();
100:                } else if (obj == Undefined.instance) {
101:                    obj = null;
102:                }
103:                return obj;
104:            }
105:        }
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