yang/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/stmt/yang_version/YangVersionStatementSupport.java

   1 /*
   2  * Copyright (c) 2017 Pantheon Technologies, s.r.o. 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.yangtools.yang.parser.rfc7950.stmt.yang_version;
   9
  10 import com.google.common.collect.ImmutableList;
  11 import org.eclipse.jdt.annotation.NonNull;
  12 import org.opendaylight.yangtools.yang.common.YangVersion;
  13 import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
  14 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
  15 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
  16 import org.opendaylight.yangtools.yang.model.api.stmt.YangVersionEffectiveStatement;
  17 import org.opendaylight.yangtools.yang.model.api.stmt.YangVersionStatement;
  18 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.BaseStatementSupport;
  19 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
  20 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext.Mutable;
  21 import org.opendaylight.yangtools.yang.parser.spi.meta.SubstatementValidator;
  22 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
  23
  24 public final class YangVersionStatementSupport
  25         extends BaseStatementSupport<YangVersion, YangVersionStatement, YangVersionEffectiveStatement> {
  26     private static final SubstatementValidator SUBSTATEMENT_VALIDATOR = SubstatementValidator.builder(YangStmtMapping
  27         .YANG_VERSION)
  28         .build();
  29     private static final YangVersionStatementSupport INSTANCE = new YangVersionStatementSupport();
  30
  31     private static final @NonNull EmptyYangVersionStatement EMPTY_VER1_DECL =
  32             new EmptyYangVersionStatement(YangVersion.VERSION_1);
  33     private static final @NonNull EmptyYangVersionStatement EMPTY_VER1_1_DECL =
  34             new EmptyYangVersionStatement(YangVersion.VERSION_1_1);
  35     private static final @NonNull EmptyYangVersionEffectiveStatement EMPTY_VER1_EFF =
  36             new EmptyYangVersionEffectiveStatement(EMPTY_VER1_DECL);
  37     private static final @NonNull EmptyYangVersionEffectiveStatement EMPTY_VER1_1_EFF =
  38             new EmptyYangVersionEffectiveStatement(EMPTY_VER1_1_DECL);
  39
  40     private YangVersionStatementSupport() {
  41         super(YangStmtMapping.YANG_VERSION);
  42     }
  43
  44     public static YangVersionStatementSupport getInstance() {
  45         return INSTANCE;
  46     }
  47
  48     @Override
  49     public YangVersion parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
  50         return SourceException.unwrap(YangVersion.parse(value), ctx.getStatementSourceReference(),
  51             "Unsupported YANG version %s", value);
  52     }
  53
  54     @Override
  55     public void onPreLinkageDeclared(
  56             final Mutable<YangVersion, YangVersionStatement, YangVersionEffectiveStatement> stmt) {
  57         stmt.setRootVersion(stmt.getStatementArgument());
  58     }
  59
  60     @Override
  61     protected SubstatementValidator getSubstatementValidator() {
  62         return SUBSTATEMENT_VALIDATOR;
  63     }
  64
  65     @Override
  66     protected YangVersionStatement createDeclared(final StmtContext<YangVersion, YangVersionStatement, ?> ctx,
  67             final ImmutableList<? extends DeclaredStatement<?>> substatements) {
  68         return new RegularYangVersionStatement(ctx.coerceStatementArgument(), substatements);
  69     }
  70
  71     @Override
  72     protected YangVersionStatement createEmptyDeclared(final StmtContext<YangVersion, YangVersionStatement, ?> ctx) {
  73         final YangVersion argument = ctx.coerceStatementArgument();
  74         switch (argument) {
  75             case VERSION_1:
  76                 return EMPTY_VER1_DECL;
  77             case VERSION_1_1:
  78                 return EMPTY_VER1_1_DECL;
  79             default:
  80                 throw new IllegalStateException("Unhandled version " + argument);
  81         }
  82     }
  83
  84     @Override
  85     protected YangVersionEffectiveStatement createEffective(
  86             final StmtContext<YangVersion, YangVersionStatement, YangVersionEffectiveStatement> ctx,
  87             final YangVersionStatement declared,
  88             final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
  89         return new RegularYangVersionEffectiveStatement(declared, substatements);
  90     }
  91
  92     @Override
  93     protected YangVersionEffectiveStatement createEmptyEffective(
  94             final StmtContext<YangVersion, YangVersionStatement, YangVersionEffectiveStatement> ctx,
  95             final YangVersionStatement declared) {
  96         if (EMPTY_VER1_DECL.equals(declared)) {
  97             return EMPTY_VER1_EFF;
  98         } else if (EMPTY_VER1_1_DECL.equals(declared)) {
  99             return EMPTY_VER1_1_EFF;
 100         } else {
 101             return new EmptyYangVersionEffectiveStatement(declared);
 102         }
 103     }
 104 }