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.EffectiveStmtCtx.Current;
  20 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
  21 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext.Mutable;
  22 import org.opendaylight.yangtools.yang.parser.spi.meta.SubstatementValidator;
  23 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
  24
  25 public final class YangVersionStatementSupport
  26         extends BaseStatementSupport<YangVersion, YangVersionStatement, YangVersionEffectiveStatement> {
  27     private static final SubstatementValidator SUBSTATEMENT_VALIDATOR = SubstatementValidator.builder(YangStmtMapping
  28         .YANG_VERSION)
  29         .build();
  30     private static final YangVersionStatementSupport INSTANCE = new YangVersionStatementSupport();
  31
  32     private static final @NonNull EmptyYangVersionStatement EMPTY_VER1_DECL =
  33             new EmptyYangVersionStatement(YangVersion.VERSION_1);
  34     private static final @NonNull EmptyYangVersionStatement EMPTY_VER1_1_DECL =
  35             new EmptyYangVersionStatement(YangVersion.VERSION_1_1);
  36     private static final @NonNull EmptyYangVersionEffectiveStatement EMPTY_VER1_EFF =
  37             new EmptyYangVersionEffectiveStatement(EMPTY_VER1_DECL);
  38     private static final @NonNull EmptyYangVersionEffectiveStatement EMPTY_VER1_1_EFF =
  39             new EmptyYangVersionEffectiveStatement(EMPTY_VER1_1_DECL);
  40
  41     private YangVersionStatementSupport() {
  42         super(YangStmtMapping.YANG_VERSION, CopyPolicy.REJECT);
  43     }
  44
  45     public static YangVersionStatementSupport getInstance() {
  46         return INSTANCE;
  47     }
  48
  49     @Override
  50     public YangVersion parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
  51         return SourceException.unwrap(YangVersion.parse(value), ctx,  "Unsupported YANG version %s", value);
  52     }
  53
  54     @Override
  55     public void onPreLinkageDeclared(
  56             final Mutable<YangVersion, YangVersionStatement, YangVersionEffectiveStatement> stmt) {
  57         stmt.setRootVersion(stmt.argument());
  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.getArgument(), substatements);
  69     }
  70
  71     @Override
  72     protected YangVersionStatement createEmptyDeclared(final StmtContext<YangVersion, YangVersionStatement, ?> ctx) {
  73         final YangVersion argument = ctx.getArgument();
  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(final Current<YangVersion, YangVersionStatement> stmt,
  86             final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
  87         return substatements.isEmpty() ? createEmptyEffective(stmt.declared())
  88             : new RegularYangVersionEffectiveStatement(stmt.declared(), substatements);
  89     }
  90
  91     private static @NonNull YangVersionEffectiveStatement createEmptyEffective(final YangVersionStatement declared) {
  92         if (EMPTY_VER1_DECL.equals(declared)) {
  93             return EMPTY_VER1_EFF;
  94         } else if (EMPTY_VER1_1_DECL.equals(declared)) {
  95             return EMPTY_VER1_1_EFF;
  96         } else {
  97             return new EmptyYangVersionEffectiveStatement(declared);
  98         }
  99     }
 100 }