yang/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/stmt/type/AbstractTypeStatementSupport.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 static com.google.common.base.Preconditions.checkArgument;
  11
  12 import com.google.common.collect.ImmutableList;
  13 import com.google.common.collect.ImmutableMap;
  14 import java.math.BigDecimal;
  15 import java.util.Collection;
  16 import java.util.Optional;
  17 import org.eclipse.jdt.annotation.NonNull;
  18 import org.opendaylight.yangtools.yang.common.QName;
  19 import org.opendaylight.yangtools.yang.common.Uint32;
  20 import org.opendaylight.yangtools.yang.common.YangVersion;
  21 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  22 import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
  23 import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
  24 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
  25 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
  26 import org.opendaylight.yangtools.yang.model.api.stmt.BitEffectiveStatement;
  27 import org.opendaylight.yangtools.yang.model.api.stmt.FractionDigitsEffectiveStatement;
  28 import org.opendaylight.yangtools.yang.model.api.stmt.LengthEffectiveStatement;
  29 import org.opendaylight.yangtools.yang.model.api.stmt.RangeEffectiveStatement;
  30 import org.opendaylight.yangtools.yang.model.api.stmt.TypeEffectiveStatement;
  31 import org.opendaylight.yangtools.yang.model.api.stmt.TypeStatement;
  32 import org.opendaylight.yangtools.yang.model.api.stmt.TypedefEffectiveStatement;
  33 import org.opendaylight.yangtools.yang.model.api.stmt.TypedefStatement;
  34 import org.opendaylight.yangtools.yang.model.api.type.BinaryTypeDefinition;
  35 import org.opendaylight.yangtools.yang.model.api.type.BitsTypeDefinition;
  36 import org.opendaylight.yangtools.yang.model.api.type.BitsTypeDefinition.Bit;
  37 import org.opendaylight.yangtools.yang.model.api.type.BooleanTypeDefinition;
  38 import org.opendaylight.yangtools.yang.model.api.type.DecimalTypeDefinition;
  39 import org.opendaylight.yangtools.yang.model.api.type.EmptyTypeDefinition;
  40 import org.opendaylight.yangtools.yang.model.api.type.EnumTypeDefinition;
  41 import org.opendaylight.yangtools.yang.model.api.type.IdentityrefTypeDefinition;
  42 import org.opendaylight.yangtools.yang.model.api.type.InstanceIdentifierTypeDefinition;
  43 import org.opendaylight.yangtools.yang.model.api.type.Int16TypeDefinition;
  44 import org.opendaylight.yangtools.yang.model.api.type.Int32TypeDefinition;
  45 import org.opendaylight.yangtools.yang.model.api.type.Int64TypeDefinition;
  46 import org.opendaylight.yangtools.yang.model.api.type.Int8TypeDefinition;
  47 import org.opendaylight.yangtools.yang.model.api.type.LeafrefTypeDefinition;
  48 import org.opendaylight.yangtools.yang.model.api.type.StringTypeDefinition;
  49 import org.opendaylight.yangtools.yang.model.api.type.Uint16TypeDefinition;
  50 import org.opendaylight.yangtools.yang.model.api.type.Uint32TypeDefinition;
  51 import org.opendaylight.yangtools.yang.model.api.type.Uint64TypeDefinition;
  52 import org.opendaylight.yangtools.yang.model.api.type.Uint8TypeDefinition;
  53 import org.opendaylight.yangtools.yang.model.api.type.UnionTypeDefinition;
  54 import org.opendaylight.yangtools.yang.model.util.type.BitsTypeBuilder;
  55 import org.opendaylight.yangtools.yang.model.util.type.InvalidLengthConstraintException;
  56 import org.opendaylight.yangtools.yang.model.util.type.LengthRestrictedTypeBuilder;
  57 import org.opendaylight.yangtools.yang.model.util.type.RangeRestrictedTypeBuilder;
  58 import org.opendaylight.yangtools.yang.model.util.type.RestrictedTypes;
  59 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.BaseStatementSupport;
  60 import org.opendaylight.yangtools.yang.parser.spi.TypeNamespace;
  61 import org.opendaylight.yangtools.yang.parser.spi.meta.InferenceException;
  62 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder;
  63 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.InferenceAction;
  64 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.InferenceContext;
  65 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.Prerequisite;
  66 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase;
  67 import org.opendaylight.yangtools.yang.parser.spi.meta.StatementSupport;
  68 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
  69 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext.Mutable;
  70 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContextUtils;
  71 import org.opendaylight.yangtools.yang.parser.spi.meta.SubstatementValidator;
  72 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
  73
  74 abstract class AbstractTypeStatementSupport
  75         extends BaseStatementSupport<String, TypeStatement, EffectiveStatement<String, TypeStatement>> {
  76     private static final SubstatementValidator SUBSTATEMENT_VALIDATOR = SubstatementValidator.builder(
  77         YangStmtMapping.TYPE)
  78         .addOptional(YangStmtMapping.BASE)
  79         .addAny(YangStmtMapping.BIT)
  80         .addAny(YangStmtMapping.ENUM)
  81         .addOptional(YangStmtMapping.FRACTION_DIGITS)
  82         .addOptional(YangStmtMapping.LENGTH)
  83         .addOptional(YangStmtMapping.PATH)
  84         .addAny(YangStmtMapping.PATTERN)
  85         .addOptional(YangStmtMapping.RANGE)
  86         .addOptional(YangStmtMapping.REQUIRE_INSTANCE)
  87         .addAny(YangStmtMapping.TYPE)
  88         .build();
  89
  90     static final String BINARY = "binary";
  91     static final String BITS = "bits";
  92     static final String BOOLEAN = "boolean";
  93     static final String DECIMAL64 = "decimal64";
  94     static final String EMPTY = "empty";
  95     static final String ENUMERATION = "enumeration";
  96     static final String IDENTITY_REF = "identityref";
  97     static final String INSTANCE_IDENTIFIER = "instance-identifier";
  98     static final String INT8 = "int8";
  99     static final String INT16 = "int16";
 100     static final String INT32 = "int32";
 101     static final String INT64 = "int64";
 102     static final String LEAF_REF = "leafref";
 103     static final String STRING = "string";
 104     static final String UINT8 = "uint8";
 105     static final String UINT16 = "uint16";
 106     static final String UINT32 = "uint32";
 107     static final String UINT64 = "uint64";
 108     static final String UNION = "union";
 109
 110     private static final ImmutableMap<String, String> BUILT_IN_TYPES = ImmutableMap.<String, String>builder()
 111         .put(BINARY, BINARY)
 112         .put(BITS, BITS)
 113         .put(BOOLEAN, BOOLEAN)
 114         .put(DECIMAL64, DECIMAL64)
 115         .put(EMPTY, EMPTY)
 116         .put(ENUMERATION, ENUMERATION)
 117         .put(IDENTITY_REF,IDENTITY_REF)
 118         .put(INSTANCE_IDENTIFIER, INSTANCE_IDENTIFIER)
 119         .put(INT8, INT8)
 120         .put(INT16, INT16)
 121         .put(INT32, INT32)
 122         .put(INT64, INT64)
 123         .put(LEAF_REF, LEAF_REF)
 124         .put(STRING, STRING)
 125         .put(UINT8, UINT8)
 126         .put(UINT16, UINT16)
 127         .put(UINT32, UINT32)
 128         .put(UINT64, UINT64)
 129         .put(UNION, UNION)
 130         .build();
 131
 132     private static final ImmutableMap<String, StatementSupport<?, ?, ?>> ARGUMENT_SPECIFIC_SUPPORTS =
 133             ImmutableMap.<String, StatementSupport<?, ?, ?>>builder()
 134             .put(BITS, new BitsSpecificationSupport())
 135             .put(DECIMAL64, new Decimal64SpecificationSupport())
 136             .put(ENUMERATION, new EnumSpecificationSupport())
 137             .put(IDENTITY_REF, new IdentityRefSpecificationRFC6020Support())
 138             .put(INSTANCE_IDENTIFIER, new InstanceIdentifierSpecificationSupport())
 139             .put(LEAF_REF, new LeafrefSpecificationRFC6020Support())
 140             .put(UNION, new UnionSpecificationSupport())
 141             .build();
 142
 143     AbstractTypeStatementSupport() {
 144         super(YangStmtMapping.TYPE);
 145     }
 146
 147     @Override
 148     public final String parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
 149         return value;
 150     }
 151
 152     @Override
 153     public final void onFullDefinitionDeclared(
 154             final Mutable<String, TypeStatement, EffectiveStatement<String, TypeStatement>> stmt) {
 155         super.onFullDefinitionDeclared(stmt);
 156
 157         // if it is yang built-in type, no prerequisite is needed, so simply return
 158         if (BUILT_IN_TYPES.containsKey(stmt.getStatementArgument())) {
 159             return;
 160         }
 161
 162         final QName typeQName = StmtContextUtils.parseNodeIdentifier(stmt, stmt.getStatementArgument());
 163         final ModelActionBuilder typeAction = stmt.newInferenceAction(ModelProcessingPhase.EFFECTIVE_MODEL);
 164         final Prerequisite<StmtContext<?, ?, ?>> typePrereq = typeAction.requiresCtx(stmt, TypeNamespace.class,
 165                 typeQName, ModelProcessingPhase.EFFECTIVE_MODEL);
 166         typeAction.mutatesEffectiveCtx(stmt.getParentContext());
 167
 168         /*
 169          * If the type does not exist, throw new InferenceException.
 170          * Otherwise perform no operation.
 171          */
 172         typeAction.apply(new InferenceAction() {
 173             @Override
 174             public void apply(final InferenceContext ctx) {
 175                 // Intentional NOOP
 176             }
 177
 178             @Override
 179             public void prerequisiteFailed(final Collection<? extends Prerequisite<?>> failed) {
 180                 InferenceException.throwIf(failed.contains(typePrereq), stmt.getStatementSourceReference(),
 181                     "Type [%s] was not found.", typeQName);
 182             }
 183         });
 184     }
 185
 186     @Override
 187     public final String internArgument(final String rawArgument) {
 188         final String found;
 189         return (found = BUILT_IN_TYPES.get(rawArgument)) != null ? found : rawArgument;
 190     }
 191
 192     @Override
 193     public boolean hasArgumentSpecificSupports() {
 194         return !ARGUMENT_SPECIFIC_SUPPORTS.isEmpty();
 195     }
 196
 197     @Override
 198     public StatementSupport<?, ?, ?> getSupportSpecificForArgument(final String argument) {
 199         return ARGUMENT_SPECIFIC_SUPPORTS.get(argument);
 200     }
 201
 202     @Override
 203     protected final SubstatementValidator getSubstatementValidator() {
 204         return SUBSTATEMENT_VALIDATOR;
 205     }
 206
 207     @Override
 208     protected final TypeStatement createDeclared(final StmtContext<String, TypeStatement, ?> ctx,
 209             final ImmutableList<? extends DeclaredStatement<?>> substatements) {
 210         return new RegularTypeStatement(ctx, substatements);
 211     }
 212
 213     @Override
 214     protected final TypeStatement createEmptyDeclared(final StmtContext<String, TypeStatement, ?> ctx) {
 215         final TypeStatement builtin;
 216         return (builtin = BuiltinTypeStatement.lookup(ctx)) != null ? builtin : new EmptyTypeStatement(ctx);
 217     }
 218
 219     @Override
 220     protected final TypeEffectiveStatement<TypeStatement> createEffective(
 221             final StmtContext<String, TypeStatement, EffectiveStatement<String, TypeStatement>> ctx,
 222             final TypeStatement declared, final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
 223         // First look up the proper base type
 224         final TypeEffectiveStatement<TypeStatement> typeStmt = resolveType(ctx);
 225         // Now instantiate the proper effective statement for that type
 226         final TypeDefinition<?> baseType = typeStmt.getTypeDefinition();
 227         if (baseType instanceof BinaryTypeDefinition) {
 228             return createBinary(ctx, (BinaryTypeDefinition) baseType, declared, substatements);
 229         } else if (baseType instanceof BitsTypeDefinition) {
 230             return createBits(ctx, (BitsTypeDefinition) baseType, declared, substatements);
 231         } else if (baseType instanceof BooleanTypeDefinition) {
 232             return createBoolean(ctx, (BooleanTypeDefinition) baseType, declared, substatements);
 233         } else if (baseType instanceof DecimalTypeDefinition) {
 234             return createDecimal(ctx, (DecimalTypeDefinition) baseType, declared, substatements);
 235         } else if (baseType instanceof EmptyTypeDefinition) {
 236             return createEmpty(ctx, (EmptyTypeDefinition) baseType, declared, substatements);
 237         } else if (baseType instanceof EnumTypeDefinition) {
 238             return new EnumTypeEffectiveStatementImpl(ctx, (EnumTypeDefinition) baseType);
 239         } else if (baseType instanceof IdentityrefTypeDefinition) {
 240             return createIdentityref(ctx, (IdentityrefTypeDefinition) baseType, declared, substatements);
 241         } else if (baseType instanceof InstanceIdentifierTypeDefinition) {
 242             return new InstanceIdentifierTypeEffectiveStatementImpl(ctx,
 243                 (InstanceIdentifierTypeDefinition) baseType);
 244         } else if (baseType instanceof Int8TypeDefinition) {
 245             return new IntegralTypeEffectiveStatementImpl<>(ctx,
 246                     RestrictedTypes.newInt8Builder((Int8TypeDefinition) baseType, typeEffectiveSchemaPath(ctx)));
 247         } else if (baseType instanceof Int16TypeDefinition) {
 248             return new IntegralTypeEffectiveStatementImpl<>(ctx,
 249                     RestrictedTypes.newInt16Builder((Int16TypeDefinition) baseType, typeEffectiveSchemaPath(ctx)));
 250         } else if (baseType instanceof Int32TypeDefinition) {
 251             return new IntegralTypeEffectiveStatementImpl<>(ctx,
 252                     RestrictedTypes.newInt32Builder((Int32TypeDefinition) baseType, typeEffectiveSchemaPath(ctx)));
 253         } else if (baseType instanceof Int64TypeDefinition) {
 254             return new IntegralTypeEffectiveStatementImpl<>(ctx,
 255                     RestrictedTypes.newInt64Builder((Int64TypeDefinition) baseType, typeEffectiveSchemaPath(ctx)));
 256         } else if (baseType instanceof LeafrefTypeDefinition) {
 257             return new LeafrefTypeEffectiveStatementImpl(ctx, (LeafrefTypeDefinition) baseType);
 258         } else if (baseType instanceof StringTypeDefinition) {
 259             return new StringTypeEffectiveStatementImpl(ctx, (StringTypeDefinition) baseType);
 260         } else if (baseType instanceof Uint8TypeDefinition) {
 261             return new IntegralTypeEffectiveStatementImpl<>(ctx,
 262                     RestrictedTypes.newUint8Builder((Uint8TypeDefinition) baseType, typeEffectiveSchemaPath(ctx)));
 263         } else if (baseType instanceof Uint16TypeDefinition) {
 264             return new IntegralTypeEffectiveStatementImpl<>(ctx,
 265                     RestrictedTypes.newUint16Builder((Uint16TypeDefinition) baseType, typeEffectiveSchemaPath(ctx)));
 266         } else if (baseType instanceof Uint32TypeDefinition) {
 267             return new IntegralTypeEffectiveStatementImpl<>(ctx,
 268                     RestrictedTypes.newUint32Builder((Uint32TypeDefinition) baseType, typeEffectiveSchemaPath(ctx)));
 269         } else if (baseType instanceof Uint64TypeDefinition) {
 270             return new IntegralTypeEffectiveStatementImpl<>(ctx,
 271                     RestrictedTypes.newUint64Builder((Uint64TypeDefinition) baseType, typeEffectiveSchemaPath(ctx)));
 272         } else if (baseType instanceof UnionTypeDefinition) {
 273             return createUnion(ctx, (UnionTypeDefinition) baseType, declared, substatements);
 274         } else {
 275             throw new IllegalStateException("Unhandled base type " + baseType);
 276         }
 277     }
 278
 279     @Override
 280     protected final EffectiveStatement<String, TypeStatement> createEmptyEffective(
 281             final StmtContext<String, TypeStatement, EffectiveStatement<String, TypeStatement>> ctx,
 282             final TypeStatement declared) {
 283         return resolveType(ctx);
 284     }
 285
 286     static final SchemaPath typeEffectiveSchemaPath(final StmtContext<?, ?, ?> stmtCtx) {
 287         final SchemaPath path = stmtCtx.getSchemaPath().get();
 288         final SchemaPath parent = path.getParent();
 289         final QName parentQName = parent.getLastComponent();
 290         checkArgument(parentQName != null, "Path %s has an empty parent", path);
 291
 292         final QName qname = path.getLastComponent().bindTo(parentQName.getModule()).intern();
 293         return parent.createChild(qname);
 294     }
 295
 296     /**
 297      * Resolve type reference, as pointed to by the context's argument.
 298      *
 299      * @param ctx Statement context
 300      * @return Resolved type
 301      * @throws SourceException if the target type cannot be found
 302      */
 303     private static @NonNull TypeEffectiveStatement<TypeStatement> resolveType(final StmtContext<String, ?, ?> ctx) {
 304         final String argument = ctx.coerceStatementArgument();
 305         switch (argument) {
 306             case BINARY:
 307                 return BuiltinEffectiveStatement.BINARY;
 308             case BOOLEAN:
 309                 return BuiltinEffectiveStatement.BOOLEAN;
 310             case EMPTY:
 311                 return BuiltinEffectiveStatement.EMPTY;
 312             case INSTANCE_IDENTIFIER:
 313                 return BuiltinEffectiveStatement.INSTANCE_IDENTIFIER;
 314             case INT8:
 315                 return BuiltinEffectiveStatement.INT8;
 316             case INT16:
 317                 return BuiltinEffectiveStatement.INT16;
 318             case INT32:
 319                 return BuiltinEffectiveStatement.INT32;
 320             case INT64:
 321                 return BuiltinEffectiveStatement.INT64;
 322             case STRING:
 323                 return BuiltinEffectiveStatement.STRING;
 324             case UINT8:
 325                 return BuiltinEffectiveStatement.UINT8;
 326             case UINT16:
 327                 return BuiltinEffectiveStatement.UINT16;
 328             case UINT32:
 329                 return BuiltinEffectiveStatement.UINT32;
 330             case UINT64:
 331                 return BuiltinEffectiveStatement.UINT64;
 332             default:
 333                 final QName qname = StmtContextUtils.parseNodeIdentifier(ctx, argument);
 334                 final StmtContext<?, TypedefStatement, TypedefEffectiveStatement> typedef =
 335                         SourceException.throwIfNull(ctx.getFromNamespace(TypeNamespace.class, qname),
 336                             ctx.getStatementSourceReference(), "Type '%s' not found", qname);
 337                 return typedef.buildEffective().asTypeEffectiveStatement();
 338         }
 339     }
 340
 341     private static @NonNull TypeEffectiveStatement<TypeStatement> createBinary(final StmtContext<?, ?, ?> ctx,
 342             final BinaryTypeDefinition baseType, final TypeStatement declared,
 343             final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
 344         final LengthRestrictedTypeBuilder<BinaryTypeDefinition> builder =
 345                 RestrictedTypes.newBinaryBuilder(baseType, typeEffectiveSchemaPath(ctx));
 346
 347         for (EffectiveStatement<?, ?> stmt : substatements) {
 348             if (stmt instanceof LengthEffectiveStatement) {
 349                 final LengthEffectiveStatement length = (LengthEffectiveStatement)stmt;
 350
 351                 try {
 352                     builder.setLengthConstraint(length, length.argument());
 353                 } catch (IllegalStateException e) {
 354                     throw new SourceException(ctx.getStatementSourceReference(), e,
 355                         "Multiple length constraints encountered");
 356                 } catch (InvalidLengthConstraintException e) {
 357                     throw new SourceException(ctx.getStatementSourceReference(), e, "Invalid length constraint %s",
 358                         length.argument());
 359                 }
 360             }
 361         }
 362
 363         return new TypeEffectiveStatementImpl<>(declared, substatements, builder);
 364     }
 365
 366     private static @NonNull TypeEffectiveStatement<TypeStatement> createBits(final StmtContext<?, ?, ?> ctx,
 367             final BitsTypeDefinition baseType, final TypeStatement declared,
 368             final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
 369         final BitsTypeBuilder builder = RestrictedTypes.newBitsBuilder(baseType, ctx.getSchemaPath().get());
 370
 371         final YangVersion yangVersion = ctx.getRootVersion();
 372         for (final EffectiveStatement<?, ?> stmt : substatements) {
 373             if (stmt instanceof BitEffectiveStatement) {
 374                 SourceException.throwIf(yangVersion != YangVersion.VERSION_1_1, ctx.getStatementSourceReference(),
 375                         "Restricted bits type is allowed only in YANG 1.1 version.");
 376                 final BitEffectiveStatement bitSubStmt = (BitEffectiveStatement) stmt;
 377
 378                 // FIXME: this looks like a duplicate of BitsSpecificationEffectiveStatement
 379                 final Optional<Uint32> declaredPosition = bitSubStmt.getDeclaredPosition();
 380                 final Uint32 effectivePos;
 381                 if (declaredPosition.isEmpty()) {
 382                     effectivePos = getBaseTypeBitPosition(bitSubStmt.argument(), baseType, ctx);
 383                 } else {
 384                     effectivePos = declaredPosition.get();
 385                 }
 386
 387                 builder.addBit(EffectiveTypeUtil.buildBit(bitSubStmt, effectivePos));
 388             }
 389         }
 390
 391         return new TypeEffectiveStatementImpl<>(declared, substatements, builder);
 392     }
 393
 394     private static @NonNull TypeEffectiveStatement<TypeStatement> createBoolean(final StmtContext<?, ?, ?> ctx,
 395             final BooleanTypeDefinition baseType, final TypeStatement declared,
 396             final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
 397         return new TypeEffectiveStatementImpl<>(declared, substatements, RestrictedTypes.newBooleanBuilder(baseType,
 398             typeEffectiveSchemaPath(ctx)));
 399     }
 400
 401     private static @NonNull TypeEffectiveStatement<TypeStatement> createDecimal(final StmtContext<?, ?, ?> ctx,
 402             final DecimalTypeDefinition baseType, final TypeStatement declared,
 403             final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
 404         final RangeRestrictedTypeBuilder<DecimalTypeDefinition, BigDecimal> builder =
 405                 RestrictedTypes.newDecima64Builder(baseType, typeEffectiveSchemaPath(ctx));
 406
 407         for (EffectiveStatement<?, ?> stmt : substatements) {
 408             if (stmt instanceof RangeEffectiveStatement) {
 409                 final RangeEffectiveStatement range = (RangeEffectiveStatement) stmt;
 410                 builder.setRangeConstraint(range, range.argument());
 411             }
 412             if (stmt instanceof FractionDigitsEffectiveStatement) {
 413                 final Integer digits = ((FractionDigitsEffectiveStatement)stmt).argument();
 414                 SourceException.throwIf(baseType.getFractionDigits() != digits, ctx.getStatementSourceReference(),
 415                     "Cannot override fraction-digits from base type %s to %s", baseType, digits);
 416             }
 417         }
 418
 419         return new TypeEffectiveStatementImpl<>(declared, substatements, builder);
 420     }
 421
 422     private static @NonNull TypeEffectiveStatement<TypeStatement> createEmpty(final StmtContext<?, ?, ?> ctx,
 423             final EmptyTypeDefinition baseType, final TypeStatement declared,
 424             final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
 425         return new TypeEffectiveStatementImpl<>(declared, substatements, RestrictedTypes.newEmptyBuilder(baseType,
 426             typeEffectiveSchemaPath(ctx)));
 427     }
 428
 429     private static @NonNull TypeEffectiveStatement<TypeStatement> createIdentityref(final StmtContext<?, ?, ?> ctx,
 430             final IdentityrefTypeDefinition baseType, final TypeStatement declared,
 431             final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
 432         return new TypeEffectiveStatementImpl<>(declared, substatements, RestrictedTypes.newIdentityrefBuilder(baseType,
 433             typeEffectiveSchemaPath(ctx)));
 434     }
 435
 436     private static @NonNull TypeEffectiveStatement<TypeStatement> createUnion(final StmtContext<?, ?, ?> ctx,
 437             final UnionTypeDefinition baseType, final TypeStatement declared,
 438             final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
 439         return new TypeEffectiveStatementImpl<>(declared, substatements, RestrictedTypes.newUnionBuilder(baseType,
 440             typeEffectiveSchemaPath(ctx)));
 441     }
 442
 443     private static Uint32 getBaseTypeBitPosition(final String bitName, final BitsTypeDefinition baseType,
 444             final StmtContext<?, ?, ?> ctx) {
 445         for (Bit baseTypeBit : baseType.getBits()) {
 446             if (bitName.equals(baseTypeBit.getName())) {
 447                 return baseTypeBit.getPosition();
 448             }
 449         }
 450
 451         throw new SourceException(ctx.getStatementSourceReference(),
 452                 "Bit '%s' is not a subset of its base bits type %s.", bitName, baseType.getQName());
 453     }
 454 }