opendaylight/config/config-persister-directory-xml-adapter/src/main/java/org/opendaylight/controller/config/persist/storage/directory/xml/XmlDirectoryStorageAdapter.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.controller.config.persist.storage.directory.xml;
  10
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.base.Splitter;
  13 import com.google.common.collect.Sets;
  14 import java.io.File;
  15 import java.util.Set;
  16 import org.opendaylight.controller.config.persist.api.Persister;
  17 import org.opendaylight.controller.config.persist.api.PropertiesProvider;
  18 import org.opendaylight.controller.config.persist.api.StorageAdapter;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 /**
  23  * StorageAdapter that retrieves initial configuration from a directory. If multiple files are present, snapshot and
  24  * required capabilities will be merged together. Writing to this persister is not supported.
  25  */
  26 public class XmlDirectoryStorageAdapter implements StorageAdapter {
  27     private static final Logger LOG = LoggerFactory.getLogger(XmlDirectoryStorageAdapter.class);
  28
  29     public static final String DIRECTORY_STORAGE_PROP = "directoryStorage";
  30     public static final String INCLUDE_EXT_PROP = "includeExtensions";
  31     private static final char EXTENSIONS_SEPARATOR = ',';
  32
  33
  34     @Override
  35     public Persister instantiate(final PropertiesProvider propertiesProvider) {
  36         String fileStorageProperty = propertiesProvider.getProperty(DIRECTORY_STORAGE_PROP);
  37         Preconditions.checkNotNull(fileStorageProperty, "Unable to find " + propertiesProvider.getFullKeyForReporting(DIRECTORY_STORAGE_PROP));
  38         File storage  = new File(fileStorageProperty);
  39         String fileExtensions = propertiesProvider.getProperty(INCLUDE_EXT_PROP);
  40
  41         LOG.debug("Using storage: {}", storage);
  42
  43         if(fileExtensions != null) {
  44             LOG.debug("Using extensions: {}", fileExtensions);
  45             return new XmlDirectoryPersister(storage, splitExtensions(fileExtensions));
  46         } else {
  47             return new XmlDirectoryPersister(storage);
  48         }
  49     }
  50
  51     private Set<String> splitExtensions(final String fileExtensions) {
  52         return Sets.newHashSet(Splitter.on(EXTENSIONS_SEPARATOR).trimResults().omitEmptyStrings()
  53                 .split(fileExtensions));
  54     }
  55
  56 }