netconf/sal-netconf-connector/src/main/java/org/opendaylight/netconf/sal/connect/netconf/schema/YangLibrarySchemaYangSourceProvider.java

   1 /*
   2  * Copyright (c) 2015 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 package org.opendaylight.netconf.sal.connect.netconf.schema;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.io.ByteStreams;
  13 import com.google.common.util.concurrent.CheckedFuture;
  14 import com.google.common.util.concurrent.Futures;
  15 import java.io.IOException;
  16 import java.io.InputStream;
  17 import java.net.URL;
  18 import java.util.Map;
  19 import org.opendaylight.netconf.sal.connect.util.RemoteDeviceId;
  20 import org.opendaylight.yangtools.yang.model.repo.api.SchemaSourceException;
  21 import org.opendaylight.yangtools.yang.model.repo.api.SourceIdentifier;
  22 import org.opendaylight.yangtools.yang.model.repo.api.YangTextSchemaSource;
  23 import org.opendaylight.yangtools.yang.model.repo.spi.SchemaSourceProvider;
  24 import org.slf4j.Logger;
  25 import org.slf4j.LoggerFactory;
  26
  27 /**
  28  * Provides YANG schema sources from yang library
  29  */
  30 public final class YangLibrarySchemaYangSourceProvider implements SchemaSourceProvider<YangTextSchemaSource> {
  31
  32     private static final Logger LOG = LoggerFactory.getLogger(YangLibrarySchemaYangSourceProvider.class);
  33
  34     private final Map<SourceIdentifier, URL> availableSources;
  35     private final RemoteDeviceId id;
  36
  37     public YangLibrarySchemaYangSourceProvider(
  38             final RemoteDeviceId id, final Map<SourceIdentifier, URL> availableSources) {
  39         this.id = id;
  40         this.availableSources = Preconditions.checkNotNull(availableSources);
  41     }
  42
  43     @Override
  44     public CheckedFuture<? extends YangTextSchemaSource, SchemaSourceException> getSource(
  45             final SourceIdentifier sourceIdentifier) {
  46         Preconditions.checkNotNull(sourceIdentifier);
  47         Preconditions.checkArgument(availableSources.containsKey(sourceIdentifier));
  48         return download(sourceIdentifier);
  49     }
  50
  51     private CheckedFuture<? extends YangTextSchemaSource, SchemaSourceException> download(final SourceIdentifier sId) {
  52         final URL url = availableSources.get(sId);
  53         try(final InputStream in = url.openStream()) {
  54             final String schemaContent = new String(ByteStreams.toByteArray(in));
  55             final NetconfRemoteSchemaYangSourceProvider.NetconfYangTextSchemaSource yangSource =
  56                     new NetconfRemoteSchemaYangSourceProvider.
  57                             NetconfYangTextSchemaSource(id, sId, Optional.of(schemaContent));
  58             LOG.debug("Source {} downloaded from a yang library's url {}", sId, url);
  59             return Futures.immediateCheckedFuture(yangSource);
  60         } catch (IOException e) {
  61             LOG.warn("Unable to download source {} from a yang library's url {}", sId, url, e);
  62             return Futures.immediateFailedCheckedFuture(
  63                     new SchemaSourceException("Unable to download remote schema for " + sId + " from " + url, e));
  64         }
  65     }
  66 }