Source Code Cross Referenced for IHandlerContainerManager.java in  » J2EE » Pustefix » de » schlund » pfixcore » workflow » app » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Pustefix » de.schlund.pfixcore.workflow.app 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * This file is part of PFIXCORE.
003:         *
004:         * PFIXCORE is free software; you can redistribute it and/or modify
005:         * it under the terms of the GNU Lesser General Public License as published by
006:         * the Free Software Foundation; either version 2 of the License, or
007:         * (at your option) any later version.
008:         *
009:         * PFIXCORE is distributed in the hope that it will be useful,
010:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
011:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
012:         * GNU Lesser General Public License for more details.
013:         *
014:         * You should have received a copy of the GNU Lesser General Public License
015:         * along with PFIXCORE; if not, write to the Free Software
016:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
017:         *
018:         */
019:
020:        package de.schlund.pfixcore.workflow.app;
021:
022:        import java.util.HashMap;
023:        import java.util.Properties;
024:
025:        import de.schlund.pfixcore.workflow.Context;
026:        import de.schlund.pfixcore.workflow.PageRequest;
027:        import de.schlund.pfixxml.ConfigurableObject;
028:        import de.schlund.pfixxml.XMLException;
029:
030:        /**
031:         * This class is responsible for managing all {@link IHandlerContainer}.
032:         * For every servlet in the Pustefix system one IHandlerContainerManager exists.
033:         * <br/>
034:         * @author <a href="mailto:jtl@schlund.de">Jens Lautenbacher</a>
035:         */
036:
037:        public class IHandlerContainerManager implements  ConfigurableObject {
038:            // private static Logger LOG                 = Logger.getLogger(IHandlerContainerManager.class);
039:            private static String DEF_HDL_CONTAINER = "de.schlund.pfixcore.workflow.app.IHandlerSimpleContainer";
040:            /** Store the already created IHandlerContainer here, use the page as key*/
041:            private HashMap<PageRequest, IHandlerContainer> known = new HashMap<PageRequest, IHandlerContainer>();
042:
043:            /**
044:             * @see de.schlund.pfixxml.PropertyObject#init(Properties)
045:             */
046:            public void init(Object dummy) {
047:                // Takes a dummy context config object, which is only used to ensure
048:                // there is one instance if IHandlerContainerManager per context
049:                // Intentionally do nothing here :-)
050:            }
051:
052:            /**
053:             * Get the IHandler according to the passed context. If the IHandler is already
054:             * known it will be returned, else it will be created.
055:             * @param context the context containing the {@link PageRequest} where
056:             * the desired IHandlerContainer is responsible for.
057:             * @return the desired IHandlerContainer
058:             * @throws XMLException on errors when creating the IHandlerContainer.
059:             */
060:            public IHandlerContainer getIHandlerContainer(Context context)
061:                    throws XMLException {
062:                String classname = null;
063:                Properties props = context.getPropertiesForCurrentPageRequest();
064:
065:                synchronized (known) {
066:                    PageRequest page = context.getCurrentPageRequest();
067:                    IHandlerContainer retval = known.get(page);
068:                    if (retval == null) {
069:                        // LOG.debug("----- cachemiss for IHandlerContainer on page " + page.getName());
070:                        try {
071:
072:                            classname = props
073:                                    .getProperty(IHandlerSimpleContainer.PROP_CONTAINER);
074:                            if (classname == null) {
075:                                classname = DEF_HDL_CONTAINER;
076:                            }
077:                            retval = (IHandlerContainer) Class.forName(
078:                                    classname).newInstance();
079:                            retval.initIHandlers(context
080:                                    .getConfigForCurrentPageRequest());
081:                        } catch (InstantiationException e) {
082:                            throw new XMLException(
083:                                    "unable to instantiate class [" + classname
084:                                            + "]" + e.getMessage());
085:                        } catch (IllegalAccessException e) {
086:                            throw new XMLException("unable access class ["
087:                                    + classname + "]" + e.getMessage());
088:                        } catch (ClassNotFoundException e) {
089:                            throw new XMLException("unable to find class ["
090:                                    + classname + "]" + e.getMessage());
091:                        } catch (ClassCastException e) {
092:                            throw new XMLException(
093:                                    "class ["
094:                                            + classname
095:                                            + "] does not implement the interface IHandlerContainer"
096:                                            + e.getMessage());
097:                        }
098:                        known.put(page, retval);
099:                    } else {
100:                        // LOG.debug("+++++ cachehit for IHandlerContainer on page " + page.getName());
101:                    }
102:                    return retval;
103:                }
104:            }
105:
106:        }// IHandlerContainerFactory
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