yang/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/stmt/type/UnionSpecificationSupport.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.type;
   9
  10 import com.google.common.collect.ImmutableList;
  11 import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
  12 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
  13 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
  14 import org.opendaylight.yangtools.yang.model.api.stmt.TypeEffectiveStatement;
  15 import org.opendaylight.yangtools.yang.model.api.stmt.TypeStatement.UnionSpecification;
  16 import org.opendaylight.yangtools.yang.model.util.type.BaseTypes;
  17 import org.opendaylight.yangtools.yang.model.util.type.UnionTypeBuilder;
  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.SubstatementValidator;
  21 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
  22
  23 final class UnionSpecificationSupport
  24         extends BaseStatementSupport<String, UnionSpecification, EffectiveStatement<String, UnionSpecification>> {
  25     private static final SubstatementValidator SUBSTATEMENT_VALIDATOR = SubstatementValidator.builder(YangStmtMapping
  26         .TYPE)
  27         .addMultiple(YangStmtMapping.TYPE)
  28         .build();
  29
  30     UnionSpecificationSupport() {
  31         super(YangStmtMapping.TYPE);
  32     }
  33
  34     @Override
  35     public String parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
  36         return value;
  37     }
  38
  39     @Override
  40     protected SubstatementValidator getSubstatementValidator() {
  41         return SUBSTATEMENT_VALIDATOR;
  42     }
  43
  44     @Override
  45     protected UnionSpecification createDeclared(final StmtContext<String, UnionSpecification, ?> ctx,
  46             final ImmutableList<? extends DeclaredStatement<?>> substatements) {
  47         return new UnionSpecificationImpl(ctx, substatements);
  48     }
  49
  50     @Override
  51     protected UnionSpecification createEmptyDeclared(final StmtContext<String, UnionSpecification, ?> ctx) {
  52         throw noType(ctx);
  53     }
  54
  55     @Override
  56     protected EffectiveStatement<String, UnionSpecification> createEffective(
  57             final StmtContext<String, UnionSpecification, EffectiveStatement<String, UnionSpecification>> ctx,
  58             final UnionSpecification declared, final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
  59         final UnionTypeBuilder builder = BaseTypes.unionTypeBuilder(ctx.getSchemaPath().get());
  60
  61         for (final EffectiveStatement<?, ?> stmt : substatements) {
  62             if (stmt instanceof TypeEffectiveStatement) {
  63                 builder.addType(((TypeEffectiveStatement<?>)stmt).getTypeDefinition());
  64             }
  65         }
  66
  67         return new TypeEffectiveStatementImpl<>(declared, substatements, builder);
  68     }
  69
  70     @Override
  71     protected EffectiveStatement<String, UnionSpecification> createEmptyEffective(
  72             final StmtContext<String, UnionSpecification, EffectiveStatement<String, UnionSpecification>> ctx,
  73             final UnionSpecification declared) {
  74         throw noType(ctx);
  75     }
  76
  77     private static SourceException noType(final StmtContext<?, ?, ?> ctx) {
  78         /*
  79          *  https://tools.ietf.org/html/rfc7950#section-9.12
  80          *
  81          *     When the type is "union", the "type" statement (Section 7.4) MUST be
  82          *     present.
  83          */
  84         return new SourceException("At least one type statement has to be present", ctx.getStatementSourceReference());
  85     }
  86 }