package org.kuali.ole.docstore.util;
   
   import java.io.IOException;
   import java.util.ArrayList;
   import java.util.Collections;
   import java.util.List;
   import java.util.Properties;
   
   import org.kuali.ole.utility.Constants;
  import org.kuali.ole.utility.ResourceUtil;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Created with IntelliJ IDEA. User: Sreekanth Date: 6/28/12 Time: 5:40 PM To change this template use File | Settings |
   * File Templates.
   */
  public class PropertyUtil {
      private static final Logger LOG = LoggerFactory.getLogger(PropertyUtil.class);
      ResourceUtil resourceUtil = new ResourceUtil();
      private static PropertyUtil propertyUtil = new PropertyUtil();
      private static final String DEFAULT_VALUE_PREFIX = Constants.DEFAULT_VALUE_PREFIX;
      private static final String DEFAULT_ENVIRONMENT = Constants.DEFAULT_ENVIRONMENT;
      private static final String ENVIRONMENT_SYSTEM_PROPERTY = Constants.ENVIRONMENT_SYSTEM_PROPERTY;
      private static final String DOC_STORE_PROPERTIES_FILE_NAME = "documentstore.properties";
      private static final String DOC_STORE_PROPERTIES_DEFAULT_LOCATION = "classpath:" + DOC_STORE_PROPERTIES_FILE_NAME;
      private static final String DOC_STORE_PROPERTIES_HOME_ENV = "docstore.properties.home";
  //    private String specifiedLocation = DOC_STORE_PROPERTIES_HOME_ENV + "/" + DOC_STORE_PROPERTIES_FILE_NAME;
      private String environment = resourceUtil.getSystemProperty(ENVIRONMENT_SYSTEM_PROPERTY, DEFAULT_ENVIRONMENT);
  
      public static PropertyUtil getPropertyUtil() {
          return propertyUtil;
      }
  
      private Properties props;
  
      private PropertyUtil() {
          try {
              LOG.info(ENVIRONMENT_SYSTEM_PROPERTY + "=" + environment);
              Properties defaultProperties = resourceUtil.getProperties(DOC_STORE_PROPERTIES_DEFAULT_LOCATION);
              Properties systemProperties = resourceUtil.getPropertiesFromSystemProperty(DocStoreEnvUtil.DOC_STORE_PROPERTIES_FILE_SYS_PROP);
              props = new Properties();
              props.putAll(defaultProperties);
              props.putAll(systemProperties);
              List<String> propertyNames = new ArrayList<String>(props.stringPropertyNames());
              Collections.sort(propertyNames);
              for (String key : propertyNames) {
                  boolean display = key.startsWith(DEFAULT_VALUE_PREFIX) || key.startsWith(environment);
                  if (display) {
                      LOG.info(key + "=" + props.getProperty(key));
                  }
              }
          } catch (IOException e) {
              throw new IllegalStateException("Exception loading properties", e);
          }
      }
  
      public String getProperty(String key) {
          return resourceUtil.getProperty(props, DEFAULT_VALUE_PREFIX, environment, key);
      }
  
  }