Source Code Cross Referenced for DAFactory.java in  » Issue-Tracking » scarab-0.21 » org » tigris » scarab » da » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Issue Tracking » scarab 0.21 » org.tigris.scarab.da 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.tigris.scarab.da;
002:
003:        /* ================================================================
004:         * Copyright (c) 2000 CollabNet.  All rights reserved.
005:         * 
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions are
008:         * met:
009:         * 
010:         * 1. Redistributions of source code must retain the above copyright
011:         * notice, this list of conditions and the following disclaimer.
012:         * 
013:         * 2. Redistributions in binary form must reproduce the above copyright
014:         * notice, this list of conditions and the following disclaimer in the
015:         * documentation and/or other materials provided with the distribution.
016:         * 
017:         * 3. The end-user documentation included with the redistribution, if
018:         * any, must include the following acknowlegement: "This product includes
019:         * software developed by CollabNet (http://www.collab.net/)."
020:         * Alternately, this acknowlegement may appear in the software itself, if
021:         * and wherever such third-party acknowlegements normally appear.
022:         * 
023:         * 4. The hosted project names must not be used to endorse or promote
024:         * products derived from this software without prior written
025:         * permission. For written permission, please contact info@collab.net.
026:         * 
027:         * 5. Products derived from this software may not use the "Tigris" name
028:         * nor may "Tigris" appear in their names without prior written
029:         * permission of CollabNet.
030:         * 
031:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
032:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
033:         * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
034:         * IN NO EVENT SHALL COLLAB.NET OR ITS CONTRIBUTORS BE LIABLE FOR ANY
035:         * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
036:         * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
037:         * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
038:         * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
039:         * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
040:         * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
041:         * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
042:         *
043:         * ====================================================================
044:         * 
045:         * This software consists of voluntary contributions made by many
046:         * individuals on behalf of CollabNet.
047:         */
048:
049:        import java.util.HashMap;
050:        import java.util.Map;
051:
052:        import org.apache.commons.lang.exception.NestableError;
053:
054:        import org.apache.turbine.Turbine;
055:
056:        /**
057:         * A lookup interface for the data access layer classes.  Use instead
058:         * of Fulcrum for simplicity.  Migration to an Avalon-based or other
059:         * "standard" API is a longer term possibility.
060:         */
061:        public class DAFactory {
062:            private static Map instances = new HashMap();
063:
064:            public static AttributeAccess getAttributeAccess() {
065:                return (AttributeAccess) lookup("AttributeAccess");
066:            }
067:
068:            /**
069:             * Gets a handle to one of our data access classes, in our
070:             * configuration prefixed with <code>dataaccess</code> and
071:             * sufffixed with <code>classname</code>
072:             * (e.g. dataaccess.AttributeAccess.classname =
073:             * org.tigris.scarab.da.ScarabAttributeAccess).
074:             *
075:             * @param identifier Which data access API to get a handle for.
076:             * @throws LookupError If a ClassNotFoundException would normally
077:             * be thrown.
078:             * @throws LinkageError
079:             */
080:            private static Object lookup(String identifier) {
081:                Object da = instances.get(identifier);
082:                if (da == null) {
083:                    // There is an implicit race condition here.  Worst case
084:                    // we create extra instances of our DA impl, and/or more
085:                    // than one HashMap.  In either case, the cost of the
086:                    // waste is minimal.
087:                    Map map = new HashMap(instances);
088:                    String className = Turbine.getConfiguration().getString(
089:                            "dataaccess." + identifier + ".classname");
090:                    try {
091:                        da = Class.forName(className).newInstance();
092:                        map.put(identifier, da);
093:                        instances = map;
094:                    } catch (Exception e) {
095:                        throw new LookupError(
096:                                "Unable to create instantance of class '"
097:                                        + className + '\'', e); //EXCEPTION
098:                    }
099:                }
100:                return da;
101:            }
102:
103:            private static class LookupError extends NestableError {
104:                public LookupError(String msg, Throwable t) {
105:                    super(msg, t);
106:                }
107:            }
108:        }
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