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.eclipse.jdt.annotation.NonNull;
  12 import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
  13 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
  14 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
  15 import org.opendaylight.yangtools.yang.model.api.stmt.TypeEffectiveStatement;
  16 import org.opendaylight.yangtools.yang.model.api.stmt.TypeStatement.UnionSpecification;
  17 import org.opendaylight.yangtools.yang.model.ri.type.BaseTypes;
  18 import org.opendaylight.yangtools.yang.model.ri.type.UnionTypeBuilder;
  19 import org.opendaylight.yangtools.yang.parser.spi.meta.AbstractStringStatementSupport;
  20 import org.opendaylight.yangtools.yang.parser.spi.meta.CommonStmtCtx;
  21 import org.opendaylight.yangtools.yang.parser.spi.meta.EffectiveStmtCtx.Current;
  22 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
  23 import org.opendaylight.yangtools.yang.parser.spi.meta.SubstatementValidator;
  24 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
  25
  26 final class UnionSpecificationSupport
  27         extends AbstractStringStatementSupport<UnionSpecification, EffectiveStatement<String, UnionSpecification>> {
  28     private static final SubstatementValidator SUBSTATEMENT_VALIDATOR = SubstatementValidator.builder(YangStmtMapping
  29         .TYPE)
  30         .addMultiple(YangStmtMapping.TYPE)
  31         .build();
  32
  33     UnionSpecificationSupport() {
  34         super(YangStmtMapping.TYPE, StatementPolicy.exactReplica());
  35     }
  36
  37     @Override
  38     protected SubstatementValidator getSubstatementValidator() {
  39         return SUBSTATEMENT_VALIDATOR;
  40     }
  41
  42     @Override
  43     protected UnionSpecification createDeclared(final StmtContext<String, UnionSpecification, ?> ctx,
  44             final ImmutableList<? extends DeclaredStatement<?>> substatements) {
  45         return new UnionSpecificationImpl(ctx.getRawArgument(), substatements);
  46     }
  47
  48     @Override
  49     protected UnionSpecification createEmptyDeclared(final StmtContext<String, UnionSpecification, ?> ctx) {
  50         throw noType(ctx);
  51     }
  52
  53     @Override
  54     protected EffectiveStatement<String, UnionSpecification> createEffective(
  55             final Current<String, UnionSpecification> stmt,
  56             final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
  57         if (substatements.isEmpty()) {
  58             throw noType(stmt);
  59         }
  60
  61         final UnionTypeBuilder builder = BaseTypes.unionTypeBuilder(stmt.argumentAsTypeQName());
  62
  63         for (final EffectiveStatement<?, ?> subStmt : substatements) {
  64             if (subStmt instanceof TypeEffectiveStatement) {
  65                 builder.addType(((TypeEffectiveStatement<?>)subStmt).getTypeDefinition());
  66             }
  67         }
  68
  69         return new TypeEffectiveStatementImpl<>(stmt.declared(), substatements, builder);
  70     }
  71
  72     private static SourceException noType(final @NonNull CommonStmtCtx stmt) {
  73         /*
  74          *  https://tools.ietf.org/html/rfc7950#section-9.12
  75          *
  76          *     When the type is "union", the "type" statement (Section 7.4) MUST be
  77          *     present.
  78          */
  79         return new SourceException("At least one type statement has to be present", stmt);
  80     }
  81 }