Source Code Cross Referenced for Loader.java in  » J2EE » Jaffa » org » jaffa » presentation » portlet » component » componentdomain » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Jaffa » org.jaffa.presentation.portlet.component.componentdomain 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * ====================================================================
003:         * JAFFA - Java Application Framework For All
004:         *
005:         * Copyright (C) 2002 JAFFA Development Group
006:         *
007:         *     This library is free software; you can redistribute it and/or
008:         *     modify it under the terms of the GNU Lesser General Public
009:         *     License as published by the Free Software Foundation; either
010:         *     version 2.1 of the License, or (at your option) any later version.
011:         *
012:         *     This library is distributed in the hope that it will be useful,
013:         *     but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
015:         *     Lesser General Public License for more details.
016:         *
017:         *     You should have received a copy of the GNU Lesser General Public
018:         *     License along with this library; if not, write to the Free Software
019:         *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
020:         *
021:         * Redistribution and use of this software and associated documentation ("Software"),
022:         * with or without modification, are permitted provided that the following conditions are met:
023:         * 1.	Redistributions of source code must retain copyright statements and notices.
024:         *         Redistributions must also contain a copy of this document.
025:         * 2.	Redistributions in binary form must reproduce the above copyright notice,
026:         * 	this list of conditions and the following disclaimer in the documentation
027:         * 	and/or other materials provided with the distribution.
028:         * 3.	The name "JAFFA" must not be used to endorse or promote products derived from
029:         * 	this Software without prior written permission. For written permission,
030:         * 	please contact mail to: jaffagroup@yahoo.com.
031:         * 4.	Products derived from this Software may not be called "JAFFA" nor may "JAFFA"
032:         * 	appear in their names without prior written permission.
033:         * 5.	Due credit should be given to the JAFFA Project (http://jaffa.sourceforge.net).
034:         *
035:         * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
036:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046:         * SUCH DAMAGE.
047:         * ====================================================================
048:         */
049:
050:        /*
051:         * Loader.java
052:         *
053:         * Created on April 17, 2002, 11:53 AM
054:         */
055:
056:        package org.jaffa.presentation.portlet.component.componentdomain;
057:
058:        import java.io.IOException;
059:        import java.net.MalformedURLException;
060:        import java.net.URL;
061:        import java.util.HashMap;
062:        import java.util.Iterator;
063:        import java.util.List;
064:        import javax.xml.bind.JAXBContext;
065:        import javax.xml.bind.JAXBException;
066:        import javax.xml.bind.Unmarshaller;
067:        import org.apache.log4j.*;
068:        import org.jaffa.config.Config;
069:        import org.jaffa.presentation.portlet.component.ComponentDefinition;
070:        import org.jaffa.util.URLHelper;
071:        import org.jaffa.util.XmlHelper;
072:
073:        /** This class is used to load the domain information from the Domain Objects based
074:         * on the XML data, into definiion objects that can be used by the rest of the architecture
075:         *
076:         * @author  paule
077:         * @version 1.0
078:         */
079:        public class Loader {
080:
081:            private static Logger log = Logger.getLogger(Loader.class);
082:
083:            // If no property is specified in the framework.properties file, this is where the system
084:            // will look for the components.xml file.
085:            private static final String DEFAULT_COMPONENTS_LOCATION = "classpath:///resources/components.xml";
086:
087:            /** Read in the xml component definitions. Used by the component manager to aquire
088:             * all the component definitions. This abstracts the component manager from dealing with
089:             * the specifics of where the definitions are held and in what format.
090:             *
091:             * @return Returns a HashMap where the key is the component name, and the value is a ComponentDefinition object
092:             */
093:            public synchronized static HashMap buildComponentPool() {
094:                Components compList = null;
095:                HashMap pool = new HashMap();
096:
097:                String name = (String) Config.getProperty(
098:                        Config.PROP_COMPONENTS_FILE,
099:                        DEFAULT_COMPONENTS_LOCATION);
100:
101:                if (log.isDebugEnabled())
102:                    log.debug("Loading in the Components Definition File - "
103:                            + name);
104:                URL xmlFile = null;
105:
106:                try {
107:                    xmlFile = URLHelper.newExtendedURL(name);
108:                } catch (MalformedURLException e) {
109:                    log.fatal(
110:                            "Can't Find Components Definition File. Bad URL - "
111:                                    + name, e);
112:                    return null;
113:                }
114:
115:                try {
116:                    // create a JAXBContext capable of handling classes generated into the package
117:                    JAXBContext jc = JAXBContext
118:                            .newInstance("org.jaffa.presentation.portlet.component.componentdomain");
119:
120:                    // create an Unmarshaller
121:                    Unmarshaller u = jc.createUnmarshaller();
122:
123:                    // enable validation
124:                    u.setValidating(true);
125:
126:                    // unmarshal a document into a tree of Java content objects composed of classes from the package.
127:                    compList = (Components) u.unmarshal(XmlHelper
128:                            .stripDoctypeDeclaration(xmlFile));
129:                } catch (JAXBException e) {
130:                    log
131:                            .fatal(
132:                                    "XML Formatting Error Reading Components Definition File",
133:                                    e);
134:                    return null;
135:                } catch (IOException e) {
136:                    log.fatal("Error in Reading Components Definition File", e);
137:                    return null;
138:                }
139:
140:                if (log.isDebugEnabled())
141:                    log.debug("Parsing the Components Definition File");
142:
143:                // Now go through the component list and build a Map of Component Definitions
144:                for (Iterator it = compList.getComponent().iterator(); it
145:                        .hasNext();) {
146:                    Component c = (Component) it.next();
147:                    ComponentDefinition cd = new ComponentDefinition();
148:                    cd.setComponentClass(c.getClassName());
149:                    cd.setComponentName(c.getId());
150:                    cd.setComponentType(c.getType());
151:
152:                    // Add it to the pool.
153:                    pool.put(cd.getComponentName(), cd);
154:
155:                    // Get the List of Mandatory Functions
156:                    List mf = c.getMandatoryFunction();
157:                    if (mf != null && mf.size() != 0) {
158:                        String[] a = new String[mf.size()];
159:                        int loop = 0;
160:                        for (Iterator it2 = mf.iterator(); it2.hasNext();) {
161:                            MandatoryFunction f = (MandatoryFunction) it2
162:                                    .next();
163:                            a[loop++] = f.getName();
164:                        }
165:                        cd.setMandatoryFunctions(a);
166:                    }
167:
168:                    // Get the List of Optional Functions
169:                    List of = c.getOptionalFunction();
170:                    if (of != null && of.size() != 0) {
171:                        String[] a = new String[of.size()];
172:                        int loop = 0;
173:                        for (Iterator it2 = of.iterator(); it2.hasNext();) {
174:                            OptionalFunction f = (OptionalFunction) it2.next();
175:                            a[loop++] = f.getName();
176:                        }
177:                        cd.setOptionalFunctions(a);
178:                    }
179:
180:                    if (log.isDebugEnabled())
181:                        log.debug("Load Component : " + cd.getComponentName());
182:
183:                }
184:                // return the constructed list
185:                return pool;
186:            }
187:
188:        }
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