Source Code Cross Referenced for ComponentManager.java in  » J2EE » Jaffa » org » jaffa » presentation » portlet » component » 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 
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:        package org.jaffa.presentation.portlet.component;
051:
052:        import org.apache.log4j.Logger;
053:        import org.jaffa.presentation.portlet.session.UserSession;
054:        import org.jaffa.presentation.portlet.component.componentdomain.Loader;
055:        import java.util.Map;
056:        import java.util.HashMap;
057:        import java.util.Iterator;
058:        import org.jaffa.security.SecurityManager;
059:        import java.security.AccessControlException;
060:
061:        /** This is a Factory for creating Component instances
062:         */
063:        public class ComponentManager {
064:            private static Logger log = Logger
065:                    .getLogger(ComponentManager.class);
066:
067:            // This field will hold a cache of ComponentDefinitions
068:            private static Map c_componentPool = null;
069:
070:            /** Creates an instance of the named component. This component is then added to the UserSession. This may throw the runtime ComponentCreationRuntimeException
071:             * @param comp The name of the component to create. There should be a valid definition for this name in the 'components.xml' file
072:             * @param us The UserSession to which this component will be added
073:             * @return An instance of the Component
074:             */
075:            public static Component run(String comp, UserSession us) {
076:                try {
077:
078:                    // see if this user has access to this component
079:                    if (!SecurityManager.checkComponentAccess(comp))
080:                        throw new AccessControlException(
081:                                "No Access To Component " + comp);
082:
083:                    //Find the Definition
084:                    ComponentDefinition cd = find(comp);
085:
086:                    // Get the ClassObject of the component
087:                    Class clazz = Class.forName(cd.getComponentClass());
088:
089:                    // Create an instance of the component
090:                    Component compInst = (Component) clazz.newInstance();
091:                    compInst.setComponentId(us.getNextComponentId());
092:                    compInst.setComponentDefinition(cd);
093:                    compInst.setUserSession(us);
094:
095:                    // Add the component to the UserSession
096:                    us.addComponent(compInst);
097:                    return compInst;
098:                } catch (ClassNotFoundException e) {
099:                    String str = "Error in running the Component " + comp;
100:                    log.error(str, e);
101:                    throw new ComponentCreationRuntimeException(str, e);
102:                } catch (InstantiationException e) {
103:                    String str = "Error in running the Component " + comp;
104:                    log.error(str, e);
105:                    throw new ComponentCreationRuntimeException(str, e);
106:                } catch (IllegalAccessException e) {
107:                    String str = "Error in running the Component " + comp;
108:                    log.error(str, e);
109:                    throw new ComponentCreationRuntimeException(str, e);
110:                }
111:            }
112:
113:            /** Locate the named component. This routine uses a cache of ComponentDefinitions.
114:             * If the cache has not been initialized, this will initialize it by reading in
115:             * and XML file into the component domain objects (via JAXB), and then create a
116:             * pool of component definition objects.
117:             *
118:             * If the specified component id not found this throws a ComponentCreationRuntimeException
119:             */
120:            public static ComponentDefinition find(String comp) {
121:
122:                // Make sure the pool is loaded
123:                if (c_componentPool == null) {
124:                    c_componentPool = Loader.buildComponentPool();
125:
126:                    // Bail if the pool did not get loaded
127:                    if (c_componentPool == null) {
128:                        log
129:                                .error("Failed to build the ComponentDefinition cache");
130:                    } else {
131:                        if (log.isDebugEnabled()) {
132:                            log.debug("Loaded Component Definitions - Total="
133:                                    + c_componentPool.size());
134:                        }
135:                    }
136:                }
137:
138:                if (c_componentPool.containsKey(comp))
139:                    return (ComponentDefinition) c_componentPool.get(comp);
140:                else {
141:                    // Not Found
142:                    String str = "No ComponentDefinition found for " + comp;
143:                    log.error(str);
144:                    throw new ComponentCreationRuntimeException(str);
145:                }
146:            }
147:
148:            /** Get the component requirements, this is Map of mandatory business functions
149:             * that a user must have access to, to run this component. Each entry in the map is a
150:             * component and its 'required' functions is stored as the 'value'. The 'value' is stored
151:             * as and Array([]) of Strings .
152:             * If there is no entry in the map for a given a component, it has no required business functions
153:             * and is there for not constrained by the security system.
154:             * @return a Map containing component requirements.
155:             */
156:            public static Map getComponentRequirements() {
157:                HashMap m = new HashMap();
158:
159:                // Make sure the pool is loaded
160:                if (c_componentPool == null) {
161:                    c_componentPool = Loader.buildComponentPool();
162:                    // Bail if the pool did not get loaded
163:                    if (c_componentPool == null) {
164:                        log
165:                                .error("Failed to build the ComponentDefinition cache");
166:                        return m;
167:                    }
168:
169:                    if (log.isDebugEnabled()) {
170:                        log.debug("Loaded Component Definitions - Total="
171:                                + c_componentPool.size());
172:                    }
173:                }
174:
175:                // Loop through all the definitions, add only ones with required functions
176:                for (Iterator it = c_componentPool.keySet().iterator(); it
177:                        .hasNext();) {
178:                    String comp = (String) it.next();
179:                    String[] funcs = ((ComponentDefinition) c_componentPool
180:                            .get(comp)).getMandatoryFunctions();
181:                    // Add this component to the list.
182:                    if (funcs != null && funcs.length != 0)
183:                        m.put(comp, funcs);
184:                }
185:
186:                return m;
187:            }
188:        }
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