Source Code Cross Referenced for AbstractSessionPersistentFieldStrategy.java in  » Library » Tapestry » org » apache » tapestry » internal » 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.internal.services 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // Copyright 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.internal.services;
016:
017:        import static org.apache.tapestry.ioc.internal.util.CollectionFactory.newList;
018:        import static org.apache.tapestry.ioc.internal.util.Defense.notBlank;
019:
020:        import java.util.Collection;
021:        import java.util.Collections;
022:        import java.util.List;
023:
024:        import org.apache.tapestry.services.PersistentFieldChange;
025:        import org.apache.tapestry.services.PersistentFieldStrategy;
026:        import org.apache.tapestry.services.Request;
027:        import org.apache.tapestry.services.Session;
028:
029:        /**
030:         * Base class for strategies that store their values as keys in the session. Implements a uniform
031:         * format for the keys, based on a prefix to identify the particular strategy.
032:         */
033:        public abstract class AbstractSessionPersistentFieldStrategy implements 
034:                PersistentFieldStrategy {
035:            private final String _prefix;
036:
037:            private final Request _request;
038:
039:            protected AbstractSessionPersistentFieldStrategy(String prefix,
040:                    Request request) {
041:                _prefix = prefix;
042:                _request = request;
043:            }
044:
045:            public final Collection<PersistentFieldChange> gatherFieldChanges(
046:                    String pageName) {
047:                Session session = _request.getSession(false);
048:
049:                if (session == null)
050:                    return Collections.emptyList();
051:
052:                List<PersistentFieldChange> result = newList();
053:
054:                String fullPrefix = _prefix + pageName + ":";
055:
056:                for (String name : session.getAttributeNames(fullPrefix)) {
057:                    PersistentFieldChange change = buildChange(name, session
058:                            .getAttribute(name));
059:
060:                    result.add(change);
061:
062:                    didReadChange(session, name);
063:                }
064:
065:                return result;
066:            }
067:
068:            /**
069:             * Called after each key is read by {@link #gatherFieldChanges(String)}. This implementation
070:             * does nothing, subclasses may override.
071:             * 
072:             * @param session
073:             *            the session from which a value was just read
074:             * @param attributeName
075:             *            the name of the attribute used to read a value
076:             */
077:            protected void didReadChange(Session session, String attributeName) {
078:            }
079:
080:            private PersistentFieldChange buildChange(String name,
081:                    Object attribute) {
082:                // TODO: Regexp is probably too expensive for what we need here. Maybe an IOC InternalUtils
083:                // method for this purpose?
084:
085:                String[] chunks = name.split(":");
086:
087:                // Will be empty string for the root component
088:                String componentId = chunks[2];
089:                String fieldName = chunks[3];
090:
091:                return new PersistentFieldChangeImpl(componentId, fieldName,
092:                        attribute);
093:            }
094:
095:            public final void postChange(String pageName, String componentId,
096:                    String fieldName, Object newValue) {
097:                notBlank(pageName, "pageName");
098:                notBlank(fieldName, "fieldName");
099:
100:                StringBuilder builder = new StringBuilder(_prefix);
101:                builder.append(pageName);
102:                builder.append(':');
103:
104:                if (componentId != null)
105:                    builder.append(componentId);
106:
107:                builder.append(':');
108:                builder.append(fieldName);
109:
110:                Session session = _request.getSession(true);
111:
112:                session.setAttribute(builder.toString(), newValue);
113:            }
114:        }
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