X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?a=blobdiff_plain;f=yang%2Fyang-parser-impl%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fyangtools%2Fyang%2Fparser%2Fspi%2Fmeta%2FStmtContextUtils.java;h=984c9e3eaba285ff026946486321eeba45d20ec4;hb=16db760aab4b98e1980877bc6adb971b413af198;hp=fa2e78bddb21689f1b33376e572be8ceea10b0d0;hpb=6af38a495f688cbfa0ff2c09db7e62e4d530bb3a;p=yangtools.git

diff --git a/yang/yang-parser-impl/src/main/java/org/opendaylight/yangtools/yang/parser/spi/meta/StmtContextUtils.java b/yang/yang-parser-impl/src/main/java/org/opendaylight/yangtools/yang/parser/spi/meta/StmtContextUtils.java
index fa2e78bddb..984c9e3eab 100644
--- a/yang/yang-parser-impl/src/main/java/org/opendaylight/yangtools/yang/parser/spi/meta/StmtContextUtils.java
+++ b/yang/yang-parser-impl/src/main/java/org/opendaylight/yangtools/yang/parser/spi/meta/StmtContextUtils.java
@@ -7,140 +7,583 @@
  */
 package org.opendaylight.yangtools.yang.parser.spi.meta;
 
+import com.google.common.base.Preconditions;
+import com.google.common.base.Splitter;
+import com.google.common.base.Strings;
+import com.google.common.collect.ImmutableList;
 import java.util.Collection;
-import com.google.common.base.Function;
+import java.util.Date;
+import java.util.Optional;
+import java.util.Set;
+import java.util.function.Predicate;
+import org.opendaylight.yangtools.yang.common.QName;
+import org.opendaylight.yangtools.yang.common.QNameModule;
+import org.opendaylight.yangtools.yang.common.SimpleDateFormatUtil;
+import org.opendaylight.yangtools.yang.common.YangVersion;
+import org.opendaylight.yangtools.yang.model.api.ModuleIdentifier;
+import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
-import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
+import org.opendaylight.yangtools.yang.model.api.meta.StatementDefinition;
+import org.opendaylight.yangtools.yang.model.api.stmt.BelongsToStatement;
+import org.opendaylight.yangtools.yang.model.api.stmt.KeyStatement;
+import org.opendaylight.yangtools.yang.model.api.stmt.LeafStatement;
+import org.opendaylight.yangtools.yang.model.api.stmt.MandatoryStatement;
+import org.opendaylight.yangtools.yang.model.api.stmt.MinElementsStatement;
+import org.opendaylight.yangtools.yang.model.api.stmt.ModuleStatement;
+import org.opendaylight.yangtools.yang.model.api.stmt.PresenceStatement;
+import org.opendaylight.yangtools.yang.model.api.stmt.RevisionStatement;
+import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier;
+import org.opendaylight.yangtools.yang.model.api.stmt.SubmoduleStatement;
+import org.opendaylight.yangtools.yang.model.api.stmt.UnknownStatement;
+import org.opendaylight.yangtools.yang.model.api.stmt.UnrecognizedStatement;
+import org.opendaylight.yangtools.yang.model.repo.api.RevisionSourceIdentifier;
+import org.opendaylight.yangtools.yang.model.repo.api.SourceIdentifier;
+import org.opendaylight.yangtools.yang.parser.spi.source.BelongsToPrefixToModuleName;
+import org.opendaylight.yangtools.yang.parser.spi.source.ImpPrefixToModuleIdentifier;
+import org.opendaylight.yangtools.yang.parser.spi.source.ModuleCtxToModuleQName;
+import org.opendaylight.yangtools.yang.parser.spi.source.ModuleIdentifierToModuleQName;
+import org.opendaylight.yangtools.yang.parser.spi.source.ModuleNameToModuleQName;
+import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
 
 public final class StmtContextUtils {
-
-    private static final Function<StmtContext<?, ?,?>, DeclaredStatement<?>> BUILD_DECLARED = new Function<StmtContext<?,?,?>, DeclaredStatement<?>>() {
-        @Override
-        public DeclaredStatement<?> apply(StmtContext<?, ?, ?> input) {
-            return input.buildDeclared();
-        }
-    };
-
-    private static final Function<StmtContext<?, ?,?>, EffectiveStatement<?,?>> BUILD_EFFECTIVE = new Function<StmtContext<?,?,?>, EffectiveStatement<?,?>>() {
-        @Override
-        public EffectiveStatement<?, ?> apply(StmtContext<?, ?, ?> input) {
-            return input.buildEffective();
-        }
-    };
+    public static final Splitter LIST_KEY_SPLITTER = Splitter.on(' ').omitEmptyStrings().trimResults();
 
     private StmtContextUtils() {
         throw new UnsupportedOperationException("Utility class");
     }
 
     @SuppressWarnings("unchecked")
-    public static <D extends DeclaredStatement<?>> Function<StmtContext<?, ? extends D, ?>, D> buildDeclared() {
-        return Function.class.cast(BUILD_DECLARED);
+    public static <A, D extends DeclaredStatement<A>> A firstAttributeOf(
+            final Iterable<? extends StmtContext<?, ?, ?>> contexts, final Class<D> declaredType) {
+        for (final StmtContext<?, ?, ?> ctx : contexts) {
+            if (producesDeclared(ctx, declaredType)) {
+                return (A) ctx.getStatementArgument();
+            }
+        }
+        return null;
     }
 
     @SuppressWarnings("unchecked")
+    public static <A, D extends DeclaredStatement<A>> A firstAttributeOf(final StmtContext<?, ?, ?> ctx,
+            final Class<D> declaredType) {
+        return producesDeclared(ctx, declaredType) ? (A) ctx.getStatementArgument() : null;
+    }
 
-    public static final <E extends EffectiveStatement<?, ?>> Function<StmtContext<?, ?, ? extends E>, E> buildEffective() {
-        return Function.class.cast(BUILD_EFFECTIVE);
+    public static <A, D extends DeclaredStatement<A>> A firstSubstatementAttributeOf(
+            final StmtContext<?, ?, ?> ctx, final Class<D> declaredType) {
+        return firstAttributeOf(ctx.allSubstatements(), declaredType);
     }
 
     @SuppressWarnings("unchecked")
-    public static final <AT, DT extends DeclaredStatement<AT>> AT firstAttributeOf(
-            Iterable<? extends StmtContext<?, ?, ?>> contexts,
-            Class<DT> declaredType) {
-        for (StmtContext<?, ?, ?> ctx : contexts) {
-            if (producesDeclared(ctx, declaredType)) {
-                return (AT) ctx.getStatementArgument();
+    public static <A, D extends DeclaredStatement<A>> StmtContext<A, ?, ?> findFirstDeclaredSubstatement(
+            final StmtContext<?, ?, ?> stmtContext, final Class<D> declaredType) {
+        for (final StmtContext<?, ?, ?> subStmtContext : stmtContext.declaredSubstatements()) {
+            if (producesDeclared(subStmtContext, declaredType)) {
+                return (StmtContext<A, ?, ?>) subStmtContext;
             }
         }
         return null;
     }
 
     @SuppressWarnings("unchecked")
-    public static final <AT, DT extends DeclaredStatement<AT>> AT firstAttributeOf(
-            StmtContext<?, ?, ?> ctx, Class<DT> declaredType) {
+    public static <A, D extends DeclaredStatement<A>> Collection<StmtContext<A, D, ?>> findAllDeclaredSubstatements(
+            final StmtContext<?, ?, ?> stmtContext, final Class<D> declaredType) {
+        final ImmutableList.Builder<StmtContext<A, D, ?>> listBuilder = ImmutableList.builder();
+        for (final StmtContext<?, ?, ?> subStmtContext : stmtContext.declaredSubstatements()) {
+            if (producesDeclared(subStmtContext, declaredType)) {
+                listBuilder.add((StmtContext<A, D, ?>) subStmtContext);
+            }
+        }
+        return listBuilder.build();
+    }
 
-        if (producesDeclared(ctx, declaredType)) {
-            return (AT) ctx.getStatementArgument();
+    @SuppressWarnings("unchecked")
+    public static <A, D extends DeclaredStatement<A>> Collection<StmtContext<A, D, ?>> findAllEffectiveSubstatements(
+            final StmtContext<?, ?, ?> stmtContext, final Class<D> type) {
+        final ImmutableList.Builder<StmtContext<A, D, ?>> listBuilder = ImmutableList.builder();
+        for (final StmtContext<?, ?, ?> subStmtContext : stmtContext.effectiveSubstatements()) {
+            if (producesDeclared(subStmtContext, type)) {
+                listBuilder.add((StmtContext<A, D, ?>) subStmtContext);
+            }
         }
+        return listBuilder.build();
+    }
 
-        return null;
+    public static <A, D extends DeclaredStatement<A>> Collection<StmtContext<A, D, ?>> findAllSubstatements(
+            final StmtContext<?, ?, ?> stmtContext, final Class<D> type) {
+        final ImmutableList.Builder<StmtContext<A, D, ?>> listBuilder = ImmutableList.builder();
+        listBuilder.addAll(findAllDeclaredSubstatements(stmtContext, type));
+        listBuilder.addAll(findAllEffectiveSubstatements(stmtContext, type));
+        return listBuilder.build();
     }
 
-    public static final <DT extends DeclaredStatement<?>> StmtContext<?, ?, ?> findFirstDeclaredSubstatement(
-            StmtContext<?, ?, ?> stmtContext, Class<DT> declaredType) {
-        Collection<? extends StmtContext<?, ?, ?>> declaredSubstatements = stmtContext
-                .declaredSubstatements();
-        for (StmtContext<?, ?, ?> subStmtContext : declaredSubstatements) {
-            if (producesDeclared(subStmtContext,declaredType)) {
-                return subStmtContext;
+    @SuppressWarnings("unchecked")
+    public static <A, D extends DeclaredStatement<A>> StmtContext<A, ?, ?> findFirstEffectiveSubstatement(
+            final StmtContext<?, ?, ?> stmtContext, final Class<D> declaredType) {
+        for (final StmtContext<?, ?, ?> subStmtContext : stmtContext.effectiveSubstatements()) {
+            if (producesDeclared(subStmtContext, declaredType)) {
+                return (StmtContext<A, ?, ?>) subStmtContext;
             }
         }
         return null;
     }
 
-    public static final StmtContext<?, ?, ?> findFirstDeclaredSubstatement(
-            StmtContext<?, ?, ?> stmtContext, int startIndex, Class<? extends DeclaredStatement<?>>... types) {
+    /**
+     * Searches for the first substatement of the specified type in the specified statement context.
+     * First, it tries to find the substatement in the effective substatements of the statement context.
+     * If it was not found, then it proceeds to search in the declared substatements. If it still was not found,
+     * the method returns null.
+     *
+     * @param stmtContext statement context to search in
+     * @param declaredType substatement type to search for
+     * @param <A> statement argument type
+     * @param <D> declared statement type
+     * @return statement context that was searched for or null if was not found
+     */
+    public static <A, D extends DeclaredStatement<A>> StmtContext<A, ?, ?> findFirstSubstatement(
+            final StmtContext<?, ?, ?> stmtContext, final Class<D> declaredType) {
+        final StmtContext<A, ?, ?> effectiveSubstatement = findFirstEffectiveSubstatement(stmtContext, declaredType);
+        return effectiveSubstatement != null ? effectiveSubstatement : findFirstDeclaredSubstatement(stmtContext,
+                declaredType);
+    }
 
-        if (startIndex >= types.length)
+    @SafeVarargs
+    public static StmtContext<?, ?, ?> findFirstDeclaredSubstatement(final StmtContext<?, ?, ?> stmtContext,
+            int startIndex, final Class<? extends DeclaredStatement<?>>... types) {
+        if (startIndex >= types.length) {
             return null;
+        }
 
-        Collection<? extends StmtContext<?, ?, ?>> declaredSubstatements = stmtContext
-                .declaredSubstatements();
-        for (StmtContext<?, ?, ?> subStmtContext : declaredSubstatements) {
-            if (producesDeclared(subStmtContext,types[startIndex])) {
-                if (startIndex + 1 == types.length)
-                    return subStmtContext;
-                else
-                    return findFirstDeclaredSubstatement(subStmtContext,
-                            ++startIndex, types);
+        for (final StmtContext<?, ?, ?> subStmtContext : stmtContext.declaredSubstatements()) {
+            if (producesDeclared(subStmtContext, types[startIndex])) {
+                return startIndex + 1 == types.length ? subStmtContext : findFirstDeclaredSubstatement(subStmtContext,
+                        ++startIndex, types);
             }
         }
         return null;
     }
 
-    public static final <DT extends DeclaredStatement<?>> StmtContext<?, ?, ?> findFirstDeclaredSubstatementOnSublevel(
-            StmtContext<?, ?, ?> stmtContext, Class<DT> declaredType,
-            int sublevel) {
-        Collection<? extends StmtContext<?, ?, ?>> declaredSubstatements = stmtContext
-                .declaredSubstatements();
-        for (StmtContext<?, ?, ?> subStmtContext : declaredSubstatements) {
-            if (sublevel == 1 && producesDeclared(subStmtContext,declaredType)) {
+    public static <D extends DeclaredStatement<?>> StmtContext<?, ?, ?> findFirstDeclaredSubstatementOnSublevel(
+            final StmtContext<?, ?, ?> stmtContext, final Class<D> declaredType, int sublevel) {
+        for (final StmtContext<?, ?, ?> subStmtContext : stmtContext.declaredSubstatements()) {
+            if (sublevel == 1 && producesDeclared(subStmtContext, declaredType)) {
                 return subStmtContext;
-            } else {
-                if (sublevel > 1) {
-                    StmtContext<?, ?, ?> result = findFirstDeclaredSubstatementOnSublevel(
-                            subStmtContext, declaredType, --sublevel);
-                    if (result != null)
-                        return result;
+            }
+            if (sublevel > 1) {
+                final StmtContext<?, ?, ?> result = findFirstDeclaredSubstatementOnSublevel(subStmtContext,
+                        declaredType, --sublevel);
+                if (result != null) {
+                    return result;
                 }
             }
         }
+
         return null;
     }
 
-    public static final <DT extends DeclaredStatement<?>> StmtContext<?, ?, ?> findDeepFirstDeclaredSubstatement(
-            StmtContext<?, ?, ?> stmtContext, Class<DT> declaredType) {
-
-        Collection<? extends StmtContext<?, ?, ?>> declaredSubstatements = stmtContext
-                .declaredSubstatements();
-
-        for (StmtContext<?, ?, ?> subStmtContext : declaredSubstatements) {
-            if (producesDeclared(subStmtContext,declaredType)) {
+    public static <D extends DeclaredStatement<?>> StmtContext<?, ?, ?> findDeepFirstDeclaredSubstatement(
+            final StmtContext<?, ?, ?> stmtContext, final Class<D> declaredType) {
+        for (final StmtContext<?, ?, ?> subStmtContext : stmtContext.declaredSubstatements()) {
+            if (producesDeclared(subStmtContext, declaredType)) {
                 return subStmtContext;
-            } else {
-                StmtContext<?, ?, ?> result = findDeepFirstDeclaredSubstatement(
-                        subStmtContext, declaredType);
-                if (result != null)
-                    return result;
+            }
 
+            final StmtContext<?, ?, ?> result = findDeepFirstDeclaredSubstatement(subStmtContext, declaredType);
+            if (result != null) {
+                return result;
             }
         }
+
         return null;
     }
 
-    public static final boolean producesDeclared(StmtContext<?, ?, ?> ctx,
-            Class<? extends DeclaredStatement<?>> type) {
-        return type.isAssignableFrom(ctx.getPublicDefinition()
-                .getDeclaredRepresentationClass());
+    public static boolean producesDeclared(final StmtContext<?, ?, ?> ctx,
+            final Class<? extends DeclaredStatement<?>> type) {
+        return type.isAssignableFrom(ctx.getPublicDefinition().getDeclaredRepresentationClass());
+    }
+
+    public static boolean isInExtensionBody(final StmtContext<?, ?, ?> stmtCtx) {
+        StmtContext<?, ?, ?> current = stmtCtx;
+        while (current.getParentContext().getParentContext() != null) {
+            current = current.getParentContext();
+            if (isUnknownStatement(current)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Returns true if supplied statement context represents unknown statement,
+     * otherwise returns false.
+     *
+     * @param stmtCtx
+     *            statement context to be checked
+     * @return true if supplied statement context represents unknown statement,
+     *         otherwise false
+     * @throws NullPointerException
+     *             if supplied statement context is null
+     */
+    public static boolean isUnknownStatement(final StmtContext<?, ?, ?> stmtCtx) {
+        return UnknownStatement.class
+                .isAssignableFrom(stmtCtx.getPublicDefinition().getDeclaredRepresentationClass());
+    }
+
+    /**
+     * Returns true if supplied statement context represents unrecognized
+     * statement, otherwise returns false.
+     *
+     * @param stmtCtx
+     *            statement context to be checked
+     * @return true if supplied statement context represents unrecognized
+     *         statement, otherwise false
+     * @throws NullPointerException
+     *             if supplied statement context is null
+     */
+    public static boolean isUnrecognizedStatement(final StmtContext<?, ?, ?> stmtCtx) {
+        return UnrecognizedStatement.class
+                .isAssignableFrom(stmtCtx.getPublicDefinition().getDeclaredRepresentationClass());
+    }
+
+    public static boolean checkFeatureSupport(final StmtContext<?, ?, ?> stmtContext,
+            final Set<QName> supportedFeatures) {
+        boolean isSupported = false;
+        boolean containsIfFeature = false;
+        for (final StmtContext<?, ?, ?> stmt : stmtContext.declaredSubstatements()) {
+            if (YangStmtMapping.IF_FEATURE.equals(stmt.getPublicDefinition())) {
+                containsIfFeature = true;
+                if (((Predicate<Set<QName>>) stmt.getStatementArgument()).test(supportedFeatures)) {
+                    isSupported = true;
+                } else {
+                    isSupported = false;
+                    break;
+                }
+            }
+        }
+
+        return !containsIfFeature || isSupported;
+    }
+
+    /**
+     * Checks whether statement context is a presence container or not.
+     *
+     * @param stmtCtx
+     *            statement context
+     * @return true if it is a presence container
+     */
+    public static boolean isPresenceContainer(final StmtContext<?, ?, ?> stmtCtx) {
+        return stmtCtx.getPublicDefinition() == YangStmtMapping.CONTAINER && containsPresenceSubStmt(stmtCtx);
+    }
+
+    /**
+     * Checks whether statement context is a non-presence container or not.
+     *
+     * @param stmtCtx
+     *            statement context
+     * @return true if it is a non-presence container
+     */
+    public static boolean isNonPresenceContainer(final StmtContext<?, ?, ?> stmtCtx) {
+        return stmtCtx.getPublicDefinition() == YangStmtMapping.CONTAINER && !containsPresenceSubStmt(stmtCtx);
+    }
+
+    private static boolean containsPresenceSubStmt(final StmtContext<?, ?, ?> stmtCtx) {
+        return findFirstSubstatement(stmtCtx, PresenceStatement.class) != null;
+    }
+
+    /**
+     * Checks whether statement context is a mandatory leaf, choice, anyxml,
+     * list or leaf-list according to RFC6020 or not.
+     *
+     * @param stmtCtx
+     *            statement context
+     * @return true if it is a mandatory leaf, choice, anyxml, list or leaf-list
+     *         according to RFC6020.
+     */
+    public static boolean isMandatoryNode(final StmtContext<?, ?, ?> stmtCtx) {
+        if (!(stmtCtx.getPublicDefinition() instanceof YangStmtMapping)) {
+            return false;
+        }
+        switch ((YangStmtMapping) stmtCtx.getPublicDefinition()) {
+        case LEAF:
+        case CHOICE:
+        case ANYXML:
+            return Boolean.TRUE.equals(firstSubstatementAttributeOf(stmtCtx, MandatoryStatement.class));
+        case LIST:
+        case LEAF_LIST:
+            final Integer minElements = firstSubstatementAttributeOf(stmtCtx, MinElementsStatement.class);
+            return minElements != null && minElements > 0;
+        default:
+            return false;
+        }
+    }
+
+    /**
+     * Checks whether a statement context is a statement of supplied statement
+     * definition and whether it is not mandatory leaf, choice, anyxml, list or
+     * leaf-list according to RFC6020.
+     *
+     * @param stmtCtx
+     *            statement context
+     * @param stmtDef
+     *            statement definition
+     * @return true if supplied statement context is a statement of supplied
+     *         statement definition and if it is not mandatory leaf, choice,
+     *         anyxml, list or leaf-list according to RFC6020
+     */
+    public static boolean isNotMandatoryNodeOfType(final StmtContext<?, ?, ?> stmtCtx,
+            final StatementDefinition stmtDef) {
+        return stmtCtx.getPublicDefinition().equals(stmtDef) && !isMandatoryNode(stmtCtx);
+    }
+
+    /**
+     * Checks whether at least one ancestor of a StatementContext matches one
+     * from collection of statement definitions.
+     *
+     * @param ctx
+     *            StatementContext to be checked
+     * @param ancestorTypes
+     *            collection of statement definitions
+     *
+     * @return true if at least one ancestor of a StatementContext matches one
+     *         from collection of statement definitions, otherwise false.
+     */
+    public static boolean hasAncestorOfType(final StmtContext<?, ?, ?> ctx,
+            final Collection<StatementDefinition> ancestorTypes) {
+        Preconditions.checkNotNull(ctx);
+        Preconditions.checkNotNull(ancestorTypes);
+        StmtContext<?, ?, ?> current = ctx.getParentContext();
+        while (current != null) {
+            if (ancestorTypes.contains(current.getPublicDefinition())) {
+                return true;
+            }
+            current = current.getParentContext();
+        }
+        return false;
+    }
+
+    /**
+     * Checks whether all of StmtContext's ancestors of specified type have a child of specified type
+     *
+     * @param ctx StmtContext to be checked
+     * @param ancestorType type of ancestor to search for
+     * @param ancestorChildType type of child to search for in the specified ancestor type
+     *
+     * @return true if all of StmtContext's ancestors of specified type have a child of specified type, otherwise false
+     */
+    public static <A, D extends DeclaredStatement<A>> boolean hasAncestorOfTypeWithChildOfType(final StmtContext<?, ?, ?> ctx,
+            final StatementDefinition ancestorType, final StatementDefinition ancestorChildType) {
+        Preconditions.checkNotNull(ctx);
+        Preconditions.checkNotNull(ancestorType);
+        Preconditions.checkNotNull(ancestorChildType);
+
+        StmtContext<?, ?, ?> current = ctx.getParentContext();
+        StmtContext<?, ?, ?> parent = current.getParentContext();
+        while (parent != null) {
+            if (ancestorType.equals(current.getPublicDefinition())) {
+                @SuppressWarnings("unchecked")
+                final Class<D> ancestorChildTypeClass = (Class<D>) ancestorChildType.getDeclaredRepresentationClass();
+                if (findFirstSubstatement(current, ancestorChildTypeClass) == null) {
+                    return false;
+                }
+            }
+
+            current = parent;
+            parent = current.getParentContext();
+        }
+
+        return true;
+    }
+
+    /**
+     * Checks whether the parent of StmtContext is of specified type
+     *
+     * @param ctx
+     *            StmtContext to be checked
+     * @param parentType
+     *            type of parent to check
+     *
+     * @return true if the parent of StmtContext is of specified type, otherwise
+     *         false
+     */
+    public static boolean hasParentOfType(final StmtContext<?, ?, ?> ctx, final StatementDefinition parentType) {
+        Preconditions.checkNotNull(ctx);
+        Preconditions.checkNotNull(parentType);
+        final StmtContext<?, ?, ?> parentContext = ctx.getParentContext();
+        return parentContext != null ? parentType.equals(parentContext.getPublicDefinition()) : false;
+    }
+
+    /**
+     * Validates the specified statement context with regards to if-feature and when statement on list keys.
+     * The context can either be a leaf which is defined directly in the substatements of a keyed list or a uses
+     * statement defined in a keyed list (a uses statement may add leaves into the list).
+     *
+     * If one of the list keys contains an if-feature or a when statement in YANG 1.1 model, an exception is thrown.
+     *
+     * @param ctx statement context to be validated
+     */
+    public static void validateIfFeatureAndWhenOnListKeys(final StmtContext<?, ?, ?> ctx) {
+        Preconditions.checkNotNull(ctx);
+
+        if (!isRelevantForIfFeatureAndWhenOnListKeysCheck(ctx)) {
+            return;
+        }
+
+        final StmtContext<?, ?, ?> listStmtCtx = ctx.getParentContext();
+        final StmtContext<Collection<SchemaNodeIdentifier>, ?, ?> keyStmtCtx =
+                StmtContextUtils.findFirstDeclaredSubstatement(listStmtCtx, KeyStatement.class);
+
+        if (YangStmtMapping.LEAF.equals(ctx.getPublicDefinition())) {
+            if (isListKey(ctx, keyStmtCtx)) {
+                disallowIfFeatureAndWhenOnListKeys(ctx);
+            }
+        } else if (YangStmtMapping.USES.equals(ctx.getPublicDefinition())) {
+            StmtContextUtils.findAllEffectiveSubstatements(listStmtCtx, LeafStatement.class).forEach(leafStmtCtx -> {
+                if (isListKey(leafStmtCtx, keyStmtCtx)) {
+                    disallowIfFeatureAndWhenOnListKeys(leafStmtCtx);
+                }
+            });
+        }
+    }
+
+    private static boolean isRelevantForIfFeatureAndWhenOnListKeysCheck(final StmtContext<?, ?, ?> ctx) {
+        return YangVersion.VERSION_1_1.equals(ctx.getRootVersion())
+                && StmtContextUtils.hasParentOfType(ctx, YangStmtMapping.LIST)
+                && StmtContextUtils.findFirstDeclaredSubstatement(ctx.getParentContext(), KeyStatement.class) != null;
+    }
+
+    private static boolean isListKey(final StmtContext<?, ?, ?> leafStmtCtx,
+            final StmtContext<Collection<SchemaNodeIdentifier>, ?, ?> keyStmtCtx) {
+        for (final SchemaNodeIdentifier keyIdentifier : keyStmtCtx.getStatementArgument()) {
+            if (leafStmtCtx.getStatementArgument().equals(keyIdentifier.getLastComponent())) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private static void disallowIfFeatureAndWhenOnListKeys(final StmtContext<?, ?, ?> leafStmtCtx) {
+        leafStmtCtx.allSubstatements().forEach(leafSubstmtCtx -> {
+            final StatementDefinition statementDef = leafSubstmtCtx.getPublicDefinition();
+            SourceException.throwIf(YangStmtMapping.IF_FEATURE.equals(statementDef)
+                    || YangStmtMapping.WHEN.equals(statementDef), leafStmtCtx.getStatementSourceReference(),
+                    "%s statement is not allowed in %s leaf statement which is specified as a list key.",
+                    statementDef.getStatementName(), leafStmtCtx.getStatementArgument());
+        });
+    }
+
+    public static QName qnameFromArgument(StmtContext<?, ?, ?> ctx, final String value) {
+        if (Strings.isNullOrEmpty(value)) {
+            return ctx.getPublicDefinition().getStatementName();
+        }
+
+        String prefix;
+        QNameModule qNameModule = null;
+        String localName = null;
+
+        final String[] namesParts = value.split(":");
+        switch (namesParts.length) {
+        case 1:
+            localName = namesParts[0];
+            qNameModule = StmtContextUtils.getRootModuleQName(ctx);
+            break;
+        default:
+            prefix = namesParts[0];
+            localName = namesParts[1];
+            qNameModule = StmtContextUtils.getModuleQNameByPrefix(ctx, prefix);
+            // in case of unknown statement argument, we're not going to parse it
+            if (qNameModule == null && isUnknownStatement(ctx)) {
+                localName = value;
+                qNameModule = StmtContextUtils.getRootModuleQName(ctx);
+            }
+            if (qNameModule == null
+                    && ctx.getCopyHistory().getLastOperation() == CopyType.ADDED_BY_AUGMENTATION) {
+                ctx = ctx.getOriginalCtx().orElse(null);
+                qNameModule = StmtContextUtils.getModuleQNameByPrefix(ctx, prefix);
+            }
+            break;
+        }
+
+        qNameModule = InferenceException.throwIfNull(qNameModule, ctx.getStatementSourceReference(),
+            "Cannot resolve QNameModule for '%s'", value);
+
+        final QNameModule resultQNameModule;
+        if (qNameModule.getRevision() == null) {
+            resultQNameModule = QNameModule.create(qNameModule.getNamespace(), SimpleDateFormatUtil.DEFAULT_DATE_REV)
+                .intern();
+        } else {
+            resultQNameModule = qNameModule;
+        }
+
+        return ctx.getFromNamespace(QNameCacheNamespace.class, QName.create(resultQNameModule, localName));
+    }
+
+    public static QNameModule getRootModuleQName(final StmtContext<?, ?, ?> ctx) {
+        if (ctx == null) {
+            return null;
+        }
+
+        final StmtContext<?, ?, ?> rootCtx = ctx.getRoot();
+        final QNameModule qNameModule;
+
+        if (producesDeclared(rootCtx, ModuleStatement.class)) {
+            qNameModule = rootCtx.getFromNamespace(ModuleCtxToModuleQName.class, rootCtx);
+        } else if (producesDeclared(rootCtx, SubmoduleStatement.class)) {
+            final String belongsToModuleName = firstAttributeOf(rootCtx.declaredSubstatements(),
+                BelongsToStatement.class);
+            qNameModule = rootCtx.getFromNamespace(ModuleNameToModuleQName.class, belongsToModuleName);
+        } else {
+            qNameModule = null;
+        }
+
+        Preconditions.checkArgument(qNameModule != null, "Failed to look up root QNameModule for %s", ctx);
+        if (qNameModule.getRevision() != null) {
+            return qNameModule;
+        }
+
+        return QNameModule.create(qNameModule.getNamespace(), SimpleDateFormatUtil.DEFAULT_DATE_REV).intern();
+    }
+
+    public static QNameModule getModuleQNameByPrefix(final StmtContext<?, ?, ?> ctx, final String prefix) {
+        final ModuleIdentifier modId = ctx.getRoot().getFromNamespace(ImpPrefixToModuleIdentifier.class, prefix);
+        final QNameModule qNameModule = ctx.getFromNamespace(ModuleIdentifierToModuleQName.class, modId);
+
+        if (qNameModule == null && producesDeclared(ctx.getRoot(), SubmoduleStatement.class)) {
+            final String moduleName = ctx.getRoot().getFromNamespace(BelongsToPrefixToModuleName.class, prefix);
+            return ctx.getFromNamespace(ModuleNameToModuleQName.class, moduleName);
+        }
+        return qNameModule;
+    }
+
+    public static SourceIdentifier createSourceIdentifier(final StmtContext<?, ?, ?> root) {
+        final QNameModule qNameModule = root.getFromNamespace(ModuleCtxToModuleQName.class, root);
+        if (qNameModule != null) {
+            // creates SourceIdentifier for a module
+            return RevisionSourceIdentifier.create((String) root.getStatementArgument(),
+                qNameModule.getFormattedRevision());
+        }
+
+        // creates SourceIdentifier for a submodule
+        final Date revision = Optional.ofNullable(getLatestRevision(root.declaredSubstatements()))
+                .orElse(SimpleDateFormatUtil.DEFAULT_DATE_REV);
+        final String formattedRevision = SimpleDateFormatUtil.getRevisionFormat().format(revision);
+        return RevisionSourceIdentifier.create((String) root.getStatementArgument(), formattedRevision);
+    }
+
+    public static Date getLatestRevision(final Iterable<? extends StmtContext<?, ?, ?>> subStmts) {
+        Date revision = null;
+        for (final StmtContext<?, ?, ?> subStmt : subStmts) {
+            if (subStmt.getPublicDefinition().getDeclaredRepresentationClass().isAssignableFrom(RevisionStatement
+                    .class)) {
+                if (revision == null && subStmt.getStatementArgument() != null) {
+                    revision = (Date) subStmt.getStatementArgument();
+                } else if (subStmt.getStatementArgument() != null && ((Date) subStmt.getStatementArgument()).compareTo
+                        (revision) > 0) {
+                    revision = (Date) subStmt.getStatementArgument();
+                }
+            }
+        }
+        return revision;
     }
 }