yang/yang-parser-impl/src/main/java/org/opendaylight/yangtools/yang/parser/util/TextToASTTransformer.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
   3  * This program and the accompanying materials are made available under the
   4  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   5  * and is available at http://www.eclipse.org/legal/epl-v10.html
   6  */
   7 package org.opendaylight.yangtools.yang.parser.util;
   8
   9 import com.google.common.annotations.Beta;
  10 import com.google.common.base.Charsets;
  11 import com.google.common.io.CharStreams;
  12 import com.google.common.io.InputSupplier;
  13 import com.google.common.util.concurrent.CheckedFuture;
  14 import com.google.common.util.concurrent.Futures;
  15
  16 import java.io.IOException;
  17 import java.io.InputStream;
  18
  19 import org.antlr.v4.runtime.tree.ParseTreeWalker;
  20 import org.opendaylight.yangtools.antlrv4.code.gen.YangParser.YangContext;
  21 import org.opendaylight.yangtools.yang.model.parser.api.YangSyntaxErrorException;
  22 import org.opendaylight.yangtools.yang.model.repo.api.SchemaRepository;
  23 import org.opendaylight.yangtools.yang.model.repo.api.SchemaSourceException;
  24 import org.opendaylight.yangtools.yang.model.repo.api.YangTextSchemaSource;
  25 import org.opendaylight.yangtools.yang.model.repo.spi.SchemaSourceRegistry;
  26 import org.opendaylight.yangtools.yang.model.repo.util.SchemaSourceTransformer;
  27 import org.opendaylight.yangtools.yang.parser.impl.YangModelBasicValidationListener;
  28 import org.opendaylight.yangtools.yang.parser.impl.YangParserImpl;
  29 import org.slf4j.Logger;
  30 import org.slf4j.LoggerFactory;
  31
  32 /**
  33  * A {@link SchemaSourceTransformer} which handles translation of models from
  34  * {@link YangTextSchemaSource} representation into {@link ASTSchemaSource}.
  35  */
  36 @Beta
  37 public final class TextToASTTransformer extends SchemaSourceTransformer<YangTextSchemaSource, ASTSchemaSource> {
  38     public static final class TextToASTTransformation implements Transformation<YangTextSchemaSource, ASTSchemaSource> {
  39         @Override
  40         public CheckedFuture<ASTSchemaSource, SchemaSourceException> apply(final YangTextSchemaSource input) throws IOException, YangSyntaxErrorException {
  41             try (InputStream is = input.openStream()) {
  42                 final YangContext ctx = YangParserImpl.parseYangSource(is);
  43                 LOG.debug("Model {} parsed successfully", input);
  44
  45                 final ParseTreeWalker walker = new ParseTreeWalker();
  46                 final YangModelBasicValidationListener validator = new YangModelBasicValidationListener();
  47                 walker.walk(validator, ctx);
  48                 LOG.debug("Model {} validated successfully", input);
  49
  50                 // Backwards compatibility
  51                 final String text = CharStreams.toString(
  52                         CharStreams.newReaderSupplier(new InputSupplier<InputStream>() {
  53                             @Override
  54                             public InputStream getInput() throws IOException {
  55                                 return input.openStream();
  56                             }
  57                         }, Charsets.UTF_8));
  58
  59                 return Futures.immediateCheckedFuture(ASTSchemaSource.create(input.getIdentifier().getName(), ctx, text));
  60             }
  61         }
  62     };
  63
  64     public static final TextToASTTransformation TRANSFORMATION = new TextToASTTransformation();
  65     private static final Logger LOG = LoggerFactory.getLogger(TextToASTTransformer.class);
  66
  67     private TextToASTTransformer(final SchemaRepository provider, final SchemaSourceRegistry consumer) {
  68         super(provider, YangTextSchemaSource.class, consumer, ASTSchemaSource.class, TRANSFORMATION);
  69     }
  70
  71     public static final TextToASTTransformer create(final SchemaRepository provider, final SchemaSourceRegistry consumer) {
  72         return new TextToASTTransformer(provider, consumer);
  73     }
  74 }