/**
    * Copyright 2010-2013 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.opensource.org/licenses/ecl2.php
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.kuali.common.util.config.service;
  
  import java.io.UnsupportedEncodingException;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Properties;
  
  import org.kuali.common.util.Project;
  import org.kuali.common.util.ProjectUtils;
  import org.kuali.common.util.PropertyUtils;
  import org.kuali.common.util.config.ProjectConfigContainer;
  import org.kuali.common.util.project.KualiConstants;
  import org.kuali.common.util.project.UtilConstants;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.context.support.GenericXmlApplicationContext;
  import org.springframework.core.io.ByteArrayResource;
  import org.springframework.core.io.Resource;
  
  public class SpringConfigService extends AbstractCachingConfigService {
  
  	private static final Logger logger = LoggerFactory.getLogger(SpringConfigService.class);
  
  	private static final Map<String, ProjectConfigContainer> PROJECT_CONFIG_CACHE = new HashMap<String, ProjectConfigContainer>();
  	private static final String FILE = "metadata-spring.xml";
  	private static final String PROPS = "spring.properties";
  	private static final String BEAN = "projectConfig";
  
  	@Override
  	protected synchronized ProjectConfigContainer getCachedConfig(String groupId, String artifactId) {
  		String cacheKey = groupId + ":" + artifactId;
  		ProjectConfigContainer config = PROJECT_CONFIG_CACHE.get(cacheKey);
  		if (config == null) {
  			config = loadMetadata(groupId, artifactId);
  			logger.debug("Caching [{}]", cacheKey);
  			PROJECT_CONFIG_CACHE.put(cacheKey, config);
  		}
  		return config;
  	}
  
  	@Override
  	protected synchronized void clearCache() {
  		PROJECT_CONFIG_CACHE.clear();
  	}
  
  	@Override
  	protected String getFilename() {
  		return FILE;
  	}
  
  	@Override
  	protected Properties getBaseFilterProperties() {
  		String groupId = KualiConstants.COMMON_GROUP_ID;
  		String artifactId = UtilConstants.ARTIFACT_ID;
  		Project project = ProjectUtils.loadProject(groupId, artifactId);
  		return PropertyUtils.load(getMetadataConfigFilePath(project, PROPS));
  	}
  
  	@Override
  	protected ProjectConfigContainer getProjectConfig(String content, String encoding) {
  		GenericXmlApplicationContext context = null;
  		try {
  			Resource resource = new ByteArrayResource(content.getBytes(encoding));
  			context = new GenericXmlApplicationContext();
  			context.load(resource);
  			return (ProjectConfigContainer) context.getBean(BEAN);
  		} catch (UnsupportedEncodingException e) {
  			throw new IllegalStateException(e);
  		} finally {
  			if (context != null) {
  				context.close();
  			}
  		}
  	}
  
  }