Source Code Cross Referenced for DefaultConfiguration.java in  » Workflow-Engines » OSWorkflow » com » opensymphony » workflow » config » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » OSWorkflow » com.opensymphony.workflow.config 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2002-2003 by OpenSymphony
003:         * All rights reserved.
004:         */
005:        package com.opensymphony.workflow.config;
006:
007:        import com.opensymphony.workflow.FactoryException;
008:        import com.opensymphony.workflow.StoreException;
009:        import com.opensymphony.workflow.loader.*;
010:        import com.opensymphony.workflow.loader.ClassLoaderUtil;
011:        import com.opensymphony.workflow.spi.WorkflowStore;
012:        import com.opensymphony.workflow.util.DefaultVariableResolver;
013:        import com.opensymphony.workflow.util.VariableResolver;
014:
015:        import org.w3c.dom.*;
016:
017:        import java.io.InputStream;
018:        import java.io.Serializable;
019:
020:        import java.net.URL;
021:
022:        import java.util.*;
023:
024:        import javax.xml.parsers.*;
025:
026:        /**
027:         * Default implementation for a configuration object.
028:         * This configuration object is passed to the {@link com.opensymphony.workflow.Workflow#setConfiguration(Configuration)}
029:         * method. If the configuration is not initialized, the {@link #load(java.net.URL)} method will be called by
030:         * the workflow. Alternatively, the caller can explicitly load the configuration by calling that method before
031:         * calling {@link com.opensymphony.workflow.Workflow#setConfiguration(Configuration)}.
032:         * <p>
033:         * The loading behaviour comes into play when specifying a configuration remotely, for example in an EJB
034:         * environment. It might be desirable to ensure that the configuration is loaded from within the EJB server,
035:         * rather than in the calling client.
036:         *
037:         * @author Hani Suleiman
038:         * @version $Revision: 1.14 $
039:         */
040:        public class DefaultConfiguration implements  Configuration,
041:                Serializable {
042:            //~ Static fields/initializers /////////////////////////////////////////////
043:
044:            private static final long serialVersionUID = 4120889092947132961L;
045:            public static DefaultConfiguration INSTANCE = new DefaultConfiguration();
046:
047:            //~ Instance fields ////////////////////////////////////////////////////////
048:
049:            private Map persistenceArgs = new HashMap();
050:            private String persistenceClass;
051:            private WorkflowFactory factory = new URLWorkflowFactory();
052:            private transient WorkflowStore store = null;
053:            private VariableResolver variableResolver = new DefaultVariableResolver();
054:            private boolean initialized;
055:
056:            //~ Methods ////////////////////////////////////////////////////////////////
057:
058:            public boolean isInitialized() {
059:                return initialized;
060:            }
061:
062:            public boolean isModifiable(String name) {
063:                return factory.isModifiable(name);
064:            }
065:
066:            public void setPersistence(String persistence) {
067:                persistenceClass = persistence;
068:            }
069:
070:            public String getPersistence() {
071:                return persistenceClass;
072:            }
073:
074:            public Map getPersistenceArgs() {
075:                return persistenceArgs;
076:            }
077:
078:            public VariableResolver getVariableResolver() {
079:                return variableResolver;
080:            }
081:
082:            public WorkflowDescriptor getWorkflow(String name)
083:                    throws FactoryException {
084:                WorkflowDescriptor workflow = factory.getWorkflow(name);
085:
086:                if (workflow == null) {
087:                    throw new FactoryException("Unknown workflow name");
088:                }
089:
090:                return workflow;
091:            }
092:
093:            public String[] getWorkflowNames() throws FactoryException {
094:                return factory.getWorkflowNames();
095:            }
096:
097:            public WorkflowStore getWorkflowStore() throws StoreException {
098:                if (store == null) {
099:                    String clazz = getPersistence();
100:
101:                    try {
102:                        store = (WorkflowStore) Class.forName(clazz)
103:                                .newInstance();
104:                    } catch (Exception ex) {
105:                        throw new StoreException("Error creating store", ex);
106:                    }
107:
108:                    store.init(getPersistenceArgs());
109:                }
110:
111:                return store;
112:            }
113:
114:            public void load(URL url) throws FactoryException {
115:                InputStream is = getInputStream(url);
116:
117:                if (is == null) {
118:                    throw new FactoryException(
119:                            "Cannot find osworkflow.xml configuration file in classpath or in META-INF");
120:                }
121:
122:                try {
123:                    DocumentBuilderFactory dbf = DocumentBuilderFactory
124:                            .newInstance();
125:                    dbf.setNamespaceAware(true);
126:
127:                    DocumentBuilder db;
128:
129:                    try {
130:                        db = dbf.newDocumentBuilder();
131:                    } catch (ParserConfigurationException e) {
132:                        throw new FactoryException(
133:                                "Error creating document builder", e);
134:                    }
135:
136:                    Document doc = db.parse(is);
137:
138:                    Element root = (Element) doc.getElementsByTagName(
139:                            "osworkflow").item(0);
140:                    Element p = XMLUtil.getChildElement(root, "persistence");
141:                    Element resolver = XMLUtil
142:                            .getChildElement(root, "resolver");
143:                    Element factoryElement = XMLUtil.getChildElement(root,
144:                            "factory");
145:
146:                    if (resolver != null) {
147:                        String resolverClass = resolver.getAttribute("class");
148:
149:                        if (resolverClass != null) {
150:                            variableResolver = (VariableResolver) ClassLoaderUtil
151:                                    .loadClass(resolverClass, getClass())
152:                                    .newInstance();
153:                        }
154:                    }
155:
156:                    persistenceClass = p.getAttribute("class");
157:
158:                    List args = XMLUtil.getChildElements(p, "property");
159:
160:                    //persistenceArgs = new HashMap();
161:                    for (int i = 0; i < args.size(); i++) {
162:                        Element e = (Element) args.get(i);
163:                        persistenceArgs.put(e.getAttribute("key"), e
164:                                .getAttribute("value"));
165:                    }
166:
167:                    if (factoryElement != null) {
168:                        String clazz = null;
169:
170:                        try {
171:                            clazz = factoryElement.getAttribute("class");
172:
173:                            if (clazz == null) {
174:                                throw new FactoryException(
175:                                        "factory does not specify a class attribute");
176:                            }
177:
178:                            factory = (WorkflowFactory) ClassLoaderUtil
179:                                    .loadClass(clazz, getClass()).newInstance();
180:
181:                            Properties properties = new Properties();
182:                            List props = XMLUtil.getChildElements(
183:                                    factoryElement, "property");
184:
185:                            for (int i = 0; i < props.size(); i++) {
186:                                Element e = (Element) props.get(i);
187:                                properties.setProperty(e.getAttribute("key"), e
188:                                        .getAttribute("value"));
189:                            }
190:
191:                            factory.init(properties);
192:                            factory.initDone();
193:                        } catch (FactoryException ex) {
194:                            throw ex;
195:                        } catch (Exception ex) {
196:                            throw new FactoryException(
197:                                    "Error creating workflow factory " + clazz,
198:                                    ex);
199:                        }
200:                    }
201:
202:                    initialized = true;
203:                } catch (FactoryException e) {
204:                    throw e;
205:                } catch (Exception e) {
206:                    throw new FactoryException("Error in workflow config", e);
207:                }
208:            }
209:
210:            public boolean removeWorkflow(String workflow)
211:                    throws FactoryException {
212:                return factory.removeWorkflow(workflow);
213:            }
214:
215:            public boolean saveWorkflow(String name,
216:                    WorkflowDescriptor descriptor, boolean replace)
217:                    throws FactoryException {
218:                return factory.saveWorkflow(name, descriptor, replace);
219:            }
220:
221:            /**
222:             * Load the default configuration from the current context classloader.
223:             * The search order is:
224:             * <li>Specified URL</li>
225:             * <li>osworkflow.xml</li>
226:             * <li>/osworkflow.xml</li>
227:             * <li>META-INF/osworkflow.xml</li>
228:             * <li>/META-INF/osworkflow.xml</li>
229:             */
230:            protected InputStream getInputStream(URL url) {
231:                InputStream is = null;
232:
233:                if (url != null) {
234:                    try {
235:                        is = url.openStream();
236:                    } catch (Exception ex) {
237:                    }
238:                }
239:
240:                ClassLoader classLoader = Thread.currentThread()
241:                        .getContextClassLoader();
242:
243:                if (is == null) {
244:                    try {
245:                        is = classLoader.getResourceAsStream("osworkflow.xml");
246:                    } catch (Exception e) {
247:                    }
248:                }
249:
250:                if (is == null) {
251:                    try {
252:                        is = classLoader.getResourceAsStream("/osworkflow.xml");
253:                    } catch (Exception e) {
254:                    }
255:                }
256:
257:                if (is == null) {
258:                    try {
259:                        is = classLoader
260:                                .getResourceAsStream("META-INF/osworkflow.xml");
261:                    } catch (Exception e) {
262:                    }
263:                }
264:
265:                if (is == null) {
266:                    try {
267:                        is = classLoader
268:                                .getResourceAsStream("/META-INF/osworkflow.xml");
269:                    } catch (Exception e) {
270:                    }
271:                }
272:
273:                return is;
274:            }
275:
276:            /**
277:             * Get the workflow factory for this configuration.
278:             * This method should never ever be called from client code!
279:             */
280:            WorkflowFactory getFactory() {
281:                return factory;
282:            }
283:        }
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