yang/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/stmt/AbstractSchemaEffectiveDocumentedNode.java

   1 /*
   2  * Copyright (c) 2018 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;
   9
  10 import com.google.common.annotations.Beta;
  11 import com.google.common.collect.ImmutableMap;
  12 import java.util.LinkedHashMap;
  13 import java.util.Map;
  14 import java.util.Optional;
  15 import org.opendaylight.yangtools.yang.common.QName;
  16 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
  17 import org.opendaylight.yangtools.yang.model.api.meta.IdentifierNamespace;
  18 import org.opendaylight.yangtools.yang.model.api.stmt.CaseEffectiveStatement;
  19 import org.opendaylight.yangtools.yang.model.api.stmt.ChoiceEffectiveStatement;
  20 import org.opendaylight.yangtools.yang.model.api.stmt.DataTreeAwareEffectiveStatement;
  21 import org.opendaylight.yangtools.yang.model.api.stmt.DataTreeEffectiveStatement;
  22 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaTreeAwareEffectiveStatement;
  23 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaTreeEffectiveStatement;
  24 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
  25 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
  26 import org.opendaylight.yangtools.yang.parser.spi.source.StatementSourceReference;
  27
  28 /**
  29  * An {@link AbstractEffectiveDocumentedNode} which can optionally support {@link SchemaTreeAwareEffectiveStatement}.
  30  *
  31  * @param <A> Argument type ({@link Void} if statement does not have argument.)
  32  * @param <D> Class representing declared version of this statement.
  33  * @author Robert Varga
  34  */
  35 @Beta
  36 public abstract class AbstractSchemaEffectiveDocumentedNode<A, D extends DeclaredStatement<A>>
  37         extends AbstractEffectiveDocumentedNode<A, D> {
  38     private final Map<QName, DataTreeEffectiveStatement<?>> dataTreeNamespace;
  39     private final Map<QName, SchemaTreeEffectiveStatement<?>> schemaTreeNamespace;
  40
  41     protected AbstractSchemaEffectiveDocumentedNode(final StmtContext<A, D, ?> ctx) {
  42         super(ctx);
  43
  44         if (this instanceof SchemaTreeAwareEffectiveStatement) {
  45             final StatementSourceReference ref = ctx.getStatementSourceReference();
  46             final Map<QName, SchemaTreeEffectiveStatement<?>> schemaChildren = new LinkedHashMap<>();
  47             streamEffectiveSubstatements(SchemaTreeEffectiveStatement.class).forEach(child -> {
  48                 putChild(schemaChildren, child, ref, "schema");
  49             });
  50             schemaTreeNamespace = ImmutableMap.copyOf(schemaChildren);
  51
  52             if (this instanceof DataTreeAwareEffectiveStatement && !schemaTreeNamespace.isEmpty()) {
  53                 final Map<QName, DataTreeEffectiveStatement<?>> dataChildren = new LinkedHashMap<>();
  54                 boolean sameAsSchema = true;
  55
  56                 for (SchemaTreeEffectiveStatement<?> child : schemaTreeNamespace.values()) {
  57                     if (child instanceof DataTreeEffectiveStatement) {
  58                         putChild(dataChildren, (DataTreeEffectiveStatement<?>) child, ref, "data");
  59                     } else {
  60                         sameAsSchema = false;
  61                         putChoiceDataChildren(dataChildren, ref, child);
  62                     }
  63                 }
  64
  65                 // This is a mighty hack to lower memory usage: if we consumed all schema tree children as data nodes,
  66                 // the two maps are equal and hence we can share the instance.
  67                 dataTreeNamespace = sameAsSchema ? (Map) schemaTreeNamespace : ImmutableMap.copyOf(dataChildren);
  68             } else {
  69                 dataTreeNamespace = ImmutableMap.of();
  70             }
  71         } else {
  72             dataTreeNamespace = ImmutableMap.of();
  73             schemaTreeNamespace = ImmutableMap.of();
  74         }
  75     }
  76
  77     @Override
  78     @SuppressWarnings("unchecked")
  79     protected <K, V, N extends IdentifierNamespace<K, V>> Optional<? extends Map<K, V>> getNamespaceContents(
  80             final Class<N> namespace) {
  81         if (this instanceof SchemaTreeAwareEffectiveStatement
  82                 && SchemaTreeAwareEffectiveStatement.Namespace.class.equals(namespace)) {
  83             return Optional.of((Map<K, V>) schemaTreeNamespace);
  84         }
  85         if (this instanceof DataTreeAwareEffectiveStatement
  86                 && DataTreeAwareEffectiveStatement.Namespace.class.equals(namespace)) {
  87             return Optional.of((Map<K, V>) dataTreeNamespace);
  88         }
  89         return super.getNamespaceContents(namespace);
  90     }
  91
  92     private static <T extends SchemaTreeEffectiveStatement<?>> void putChild(final Map<QName, T> map,
  93             final T child, final StatementSourceReference ref, final String tree) {
  94         final QName id = child.getIdentifier();
  95         final T prev = map.putIfAbsent(id, child);
  96         SourceException.throwIf(prev != null, ref,
  97                 "Cannot add %s tree child with name %s, a conflicting child already exists", tree, id);
  98     }
  99
 100     private static void putChoiceDataChildren(final Map<QName, DataTreeEffectiveStatement<?>> map,
 101             final StatementSourceReference ref, final SchemaTreeEffectiveStatement<?> child) {
 102         // For choice statements go through all their cases and fetch their data children
 103         if (child instanceof ChoiceEffectiveStatement) {
 104             child.streamEffectiveSubstatements(CaseEffectiveStatement.class).forEach(
 105                 caseStmt -> caseStmt.streamEffectiveSubstatements(SchemaTreeEffectiveStatement.class).forEach(stmt -> {
 106                     if (stmt instanceof DataTreeEffectiveStatement) {
 107                         putChild(map, (DataTreeEffectiveStatement<?>) stmt, ref, "data");
 108                     } else {
 109                         putChoiceDataChildren(map, ref, stmt);
 110                     }
 111                 }));
 112         }
 113     }
 114 }