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

   1 /*
   2  * Copyright (c) 2015 Cisco Systems, Inc. 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.collect.ImmutableList;
  11 import java.lang.invoke.MethodHandles;
  12 import java.lang.invoke.VarHandle;
  13 import java.util.ArrayList;
  14 import java.util.Collection;
  15 import java.util.List;
  16 import org.eclipse.jdt.annotation.NonNull;
  17 import org.opendaylight.yangtools.yang.model.api.DocumentedNode;
  18 import org.opendaylight.yangtools.yang.model.api.Status;
  19 import org.opendaylight.yangtools.yang.model.api.UnknownSchemaNode;
  20 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
  21 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
  22 import org.opendaylight.yangtools.yang.model.api.stmt.StatusEffectiveStatement;
  23 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
  24
  25 // FIXME: 6.0.0: use DocumentedNodeMixin.WithStatus instead of keeping any state
  26 public abstract class AbstractEffectiveDocumentedNodeWithStatus<A, D extends DeclaredStatement<A>>
  27         extends AbstractEffectiveDocumentedNode<A, D> implements DocumentedNode.WithStatus {
  28     private static final VarHandle UNKNOWN_NODES;
  29
  30     static {
  31         try {
  32             UNKNOWN_NODES = MethodHandles.lookup().findVarHandle(AbstractEffectiveDocumentedNodeWithStatus.class,
  33                 "unknownNodes", ImmutableList.class);
  34         } catch (NoSuchFieldException | IllegalAccessException e) {
  35             throw new ExceptionInInitializerError(e);
  36         }
  37     }
  38
  39     private final @NonNull Status status;
  40
  41     @SuppressWarnings("unused")
  42     private volatile ImmutableList<UnknownSchemaNode> unknownNodes;
  43
  44     /**
  45      * Constructor.
  46      *
  47      * @param ctx
  48      *            context of statement.
  49      */
  50     protected AbstractEffectiveDocumentedNodeWithStatus(final StmtContext<A, D, ?> ctx) {
  51         super(ctx);
  52         status = findFirstEffectiveSubstatementArgument(StatusEffectiveStatement.class).orElse(Status.CURRENT);
  53     }
  54
  55     @Override
  56     public final Status getStatus() {
  57         return status;
  58     }
  59
  60     @Override
  61     public final Collection<? extends UnknownSchemaNode> getUnknownSchemaNodes() {
  62         final ImmutableList<UnknownSchemaNode> existing =
  63                 (ImmutableList<UnknownSchemaNode>) UNKNOWN_NODES.getAcquire(this);
  64         return existing != null ? existing : loadUnknownSchemaNodes();
  65     }
  66
  67     @SuppressWarnings("unchecked")
  68     private @NonNull ImmutableList<UnknownSchemaNode> loadUnknownSchemaNodes() {
  69         final List<UnknownSchemaNode> init = new ArrayList<>();
  70         for (EffectiveStatement<?, ?> stmt : effectiveSubstatements()) {
  71             if (stmt instanceof UnknownSchemaNode) {
  72                 init.add((UnknownSchemaNode) stmt);
  73             }
  74         }
  75
  76         final ImmutableList<UnknownSchemaNode> computed = ImmutableList.copyOf(init);
  77         final Object witness = UNKNOWN_NODES.compareAndExchangeRelease(this, null, computed);
  78         return witness == null ? computed : (ImmutableList<UnknownSchemaNode>) witness;
  79     }
  80 }