001    /**
002     * Copyright 2005-2012 The Kuali Foundation
003     *
004     * Licensed under the Educational Community License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.opensource.org/licenses/ecl2.php
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.kuali.rice.kew.engine.node.var.schemes;
017    
018    import java.io.IOException;
019    import java.io.InputStream;
020    
021    import org.apache.log4j.Logger;
022    import org.kuali.rice.kew.engine.RouteContext;
023    import org.kuali.rice.kew.engine.node.PropertiesUtil;
024    import org.kuali.rice.kew.engine.node.var.Property;
025    import org.kuali.rice.kew.engine.node.var.PropertyScheme;
026    
027    
028    /**
029     * A property scheme that loads resources from the class loader.
030     *  
031     * @author Kuali Rice Team (rice.collab@kuali.org)
032     */
033    public class ResourceScheme implements PropertyScheme {
034        private static final Logger LOG = Logger.getLogger(ResourceScheme.class);
035    
036        public String getName() {
037            return "resource";
038        }
039        public String getShortName() {
040            return "res";
041        }
042    
043        public Object load(Property property, RouteContext context) {
044            String resource;
045            boolean relative = false;
046    //        if (property.locator.startsWith("/")) {
047                resource = property.locator;
048    //        } else {
049    //            relative = true;
050    //            String prefix;
051    //            /* if a resource prefix is set, use it */
052    //            if (state.getResourcePrefix() != null) {
053    //                prefix = state.getResourcePrefix();
054    //            } else {
055    //                /* otherwise use the location of the Script class */
056    //                prefix = Script.class.getPackage().getName().replace('.', '/');
057    //            }
058    //            if (!prefix.endsWith("/")) {
059    //                prefix += "/"; 
060    //            }
061    //            resource = prefix + property.locator;
062    //        }
063            String resStr = property.locator + (relative ? "(" + resource + ")" : "");
064            LOG.info("Reading resource " + resStr + "...");
065            
066            InputStream is = getClass().getResourceAsStream(resource);
067            if (is == null) {
068                throw new RuntimeException("Resource not found: " + resStr);
069            }
070            try {
071                return PropertiesUtil.readResource(is);
072            } catch (IOException ioe) {
073                throw new RuntimeException("Error loading resource: " + resStr, ioe);
074            }
075        }
076    
077        public String toString() {
078            return "[ResourceScheme]";
079        }
080    }