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
  15 import java.io.File;
  16 import java.util.Set;
  17
  18 import org.opendaylight.controller.config.persist.api.Persister;
  19 import org.opendaylight.controller.config.persist.api.PropertiesProvider;
  20 import org.opendaylight.controller.config.persist.api.StorageAdapter;
  21 import org.slf4j.Logger;
  22 import org.slf4j.LoggerFactory;
  23
  24 /**
  25  * StorageAdapter that retrieves initial configuration from a directory. If multiple files are present, snapshot and
  26  * required capabilities will be merged together. Writing to this persister is not supported.
  27  */
  28 public class XmlDirectoryStorageAdapter implements StorageAdapter {
  29     private static final Logger LOG = LoggerFactory.getLogger(XmlDirectoryStorageAdapter.class);
  30
  31     public static final String DIRECTORY_STORAGE_PROP = "directoryStorage";
  32     public static final String INCLUDE_EXT_PROP = "includeExtensions";
  33     private static final char EXTENSIONS_SEPARATOR = ',';
  34
  35     @Override
  36     public Persister instantiate(final PropertiesProvider propertiesProvider) {
  37         String fileStorageProperty = propertiesProvider.getProperty(DIRECTORY_STORAGE_PROP);
  38         Preconditions.checkNotNull(fileStorageProperty,
  39                 "Unable to find " + propertiesProvider.getFullKeyForReporting(DIRECTORY_STORAGE_PROP));
  40         File storage = new File(fileStorageProperty);
  41         String fileExtensions = propertiesProvider.getProperty(INCLUDE_EXT_PROP);
  42
  43         LOG.debug("Using storage: {}", storage);
  44
  45         if (fileExtensions != null) {
  46             LOG.debug("Using extensions: {}", fileExtensions);
  47             return new XmlDirectoryPersister(storage, splitExtensions(fileExtensions));
  48         } else {
  49             return new XmlDirectoryPersister(storage);
  50         }
  51     }
  52
  53     private Set<String> splitExtensions(final String fileExtensions) {
  54         return Sets.newHashSet(Splitter.on(EXTENSIONS_SEPARATOR).trimResults().omitEmptyStrings()
  55                 .split(fileExtensions));
  56     }
  57 }