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  package org.apache.cayenne.jcache;
  
  import java.net.URI;
  import java.net.URISyntaxException;
  import javax.cache.CacheException;
  import javax.cache.CacheManager;
  import javax.cache.Caching;
  import javax.cache.spi.CachingProvider;
  
  import org.apache.cayenne.configuration.RuntimeProperties;
  import org.apache.cayenne.di.DIRuntimeException;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.di.Provider;
  
  /**
   * @since 4.0
   */
  public class JCacheManagerProvider implements Provider<CacheManager> {
  
      @Inject
      private RuntimeProperties properties;
  
      @Override
      public CacheManager get() throws DIRuntimeException {
          CachingProvider provider;
          try {
              provider = Caching.getCachingProvider();
          } catch (CacheException e) {
              throw new RuntimeException("'cayenne-jcache' doesn't bundle any JCache providers. " +
                      "You must place a JCache 1.0 provider on classpath explicitly.", e);
          }
  
          CacheManager manager;
          URI jcacheConfig = getConfig();
  
          if(jcacheConfig == null) {
              manager = provider.getCacheManager();
          } else {
              manager = provider.getCacheManager(jcacheConfig, null);
          }
  
          return manager;
      }
  
      private URI getConfig() {
          String config = properties.get(JCacheConstants.JCACHE_PROVIDER_CONFIG);
          if(config == null) {
              return null;
          } else {
              try {
                  return new URI(config);
              } catch (URISyntaxException ex) {
                  throw new RuntimeException("Wrong value for JCache provider config property", ex);
              }
          }
      }
  }
  