001    /**
002     * Copyright 2005-2013 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.validation;
017    
018    import org.apache.commons.lang.StringUtils;
019    import org.apache.log4j.Logger;
020    import org.kuali.rice.core.api.exception.RiceIllegalArgumentException;
021    import org.kuali.rice.kew.api.extension.ExtensionDefinition;
022    import org.kuali.rice.kew.api.extension.ExtensionRepositoryService;
023    import org.kuali.rice.kew.api.extension.ExtensionUtils;
024    import org.kuali.rice.kew.api.validation.RuleValidationContext;
025    import org.kuali.rice.kew.api.validation.ValidationResults;
026    import org.kuali.rice.kew.framework.validation.RuleValidationAttributeExporterService;
027    import org.kuali.rice.kew.rule.RuleValidationAttribute;
028    import org.springframework.beans.factory.annotation.Required;
029    
030    /**
031     * RuleValidationAttributeExporterService reference impl.  Delegates to the ExtensionRepositoryService
032     * to load the custom RuleValidationAttribute.
033     *
034     * @author Kuali Rice Team (rice.collab@kuali.org)
035     */
036    public class RuleValidationAttributeExporterServiceImpl implements RuleValidationAttributeExporterService {
037        private static final Logger LOG = Logger.getLogger(RuleValidationAttributeExporterServiceImpl.class);
038    
039        private ExtensionRepositoryService extensionRepositoryService;
040    
041        @Required
042        public void setExtensionRepositoryService(ExtensionRepositoryService extensionRepositoryService) {
043            this.extensionRepositoryService = extensionRepositoryService;
044        }
045        private ExtensionRepositoryService getExtensionRepositoryService() {
046            return this.extensionRepositoryService;
047        }
048    
049        @Override
050        public ValidationResults validate(String attributeName, RuleValidationContext validationContext) {
051            if (StringUtils.isBlank(attributeName)) {
052                throw new RiceIllegalArgumentException("attribute name was null or blank");
053            }
054            RuleValidationAttribute attr = loadAttribute(attributeName);
055            return attr.validate(validationContext);
056        }
057    
058        /**
059         * Loads RuleValidationAttribute implementation class via {@link ExtensionRepositoryService}
060         * @param attributeName the RuleValidationAttribute name
061         * @return instance of the RuleValidationAttribute implementation class
062         * @throws RiceIllegalArgumentException if specified attribute name cannot be found or loaded
063         */
064        protected RuleValidationAttribute loadAttribute(String attributeName) {
065            ExtensionDefinition extensionDefinition = getExtensionRepositoryService().getExtensionByName(attributeName);
066            if (extensionDefinition == null) {
067                throw new RiceIllegalArgumentException("Failed to locate a RuleValidationAttribute with the given name: " + attributeName);
068            }
069            RuleValidationAttribute attribute = ExtensionUtils.loadExtension(extensionDefinition);
070            if (attribute == null) {
071                throw new RiceIllegalArgumentException("Failed to load RuleValidationAttribute for: " + extensionDefinition);
072            }
073            return attribute;
074        }
075    }