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.Futures;
  14 import com.google.common.util.concurrent.ListenableFuture;
  15 import java.io.IOException;
  16 import java.io.InputStream;
  17 import java.net.URL;
  18 import java.nio.charset.Charset;
  19 import java.util.Map;
  20 import org.opendaylight.netconf.sal.connect.util.RemoteDeviceId;
  21 import org.opendaylight.yangtools.yang.model.repo.api.SchemaSourceException;
  22 import org.opendaylight.yangtools.yang.model.repo.api.SourceIdentifier;
  23 import org.opendaylight.yangtools.yang.model.repo.api.YangTextSchemaSource;
  24 import org.opendaylight.yangtools.yang.model.repo.spi.SchemaSourceProvider;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27
  28 /**
  29  * Provides YANG schema sources from yang library.
  30  */
  31 public final class YangLibrarySchemaYangSourceProvider implements SchemaSourceProvider<YangTextSchemaSource> {
  32
  33     private static final Logger LOG = LoggerFactory.getLogger(YangLibrarySchemaYangSourceProvider.class);
  34
  35     private final Map<SourceIdentifier, URL> availableSources;
  36     private final RemoteDeviceId id;
  37
  38     public YangLibrarySchemaYangSourceProvider(
  39             final RemoteDeviceId id, final Map<SourceIdentifier, URL> availableSources) {
  40         this.id = id;
  41         this.availableSources = Preconditions.checkNotNull(availableSources);
  42     }
  43
  44     @Override
  45     public ListenableFuture<? extends YangTextSchemaSource> getSource(
  46             final SourceIdentifier sourceIdentifier) {
  47         Preconditions.checkNotNull(sourceIdentifier);
  48         Preconditions.checkArgument(availableSources.containsKey(sourceIdentifier));
  49         return download(sourceIdentifier);
  50     }
  51
  52     private ListenableFuture<? extends YangTextSchemaSource> download(final SourceIdentifier sourceIdentifier) {
  53         final URL url = availableSources.get(sourceIdentifier);
  54         try (InputStream in = url.openStream()) {
  55             final String schemaContent = new String(ByteStreams.toByteArray(in), Charset.defaultCharset());
  56             final NetconfRemoteSchemaYangSourceProvider.NetconfYangTextSchemaSource yangSource =
  57                     new NetconfRemoteSchemaYangSourceProvider
  58                             .NetconfYangTextSchemaSource(id, sourceIdentifier, Optional.of(schemaContent));
  59             LOG.debug("Source {} downloaded from a yang library's url {}", sourceIdentifier, url);
  60             return Futures.immediateFuture(yangSource);
  61         } catch (IOException e) {
  62             LOG.warn("Unable to download source {} from a yang library's url {}", sourceIdentifier, url, e);
  63             return Futures.immediateFailedFuture(new SchemaSourceException(
  64                 "Unable to download remote schema for " + sourceIdentifier + " from " + url, e));
  65         }
  66     }
  67 }