data/yang-data-impl/src/main/java/org/opendaylight/yangtools/yang/data/impl/schema/ImmutableMountPointNormalizedNodeStreamWriter.java

   1 /*
   2  * Copyright (c) 2019 PANTHEON.tech, 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.data.impl.schema;
   9
  10 import static com.google.common.base.Preconditions.checkState;
  11 import static java.util.Objects.requireNonNull;
  12
  13 import com.google.common.annotations.Beta;
  14 import java.io.IOException;
  15 import java.util.ArrayDeque;
  16 import java.util.Deque;
  17 import java.util.List;
  18 import org.eclipse.jdt.annotation.NonNullByDefault;
  19 import org.opendaylight.yangtools.yang.common.MountPointLabel;
  20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  21 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  22 import org.opendaylight.yangtools.yang.data.api.schema.MountPointContext;
  23 import org.opendaylight.yangtools.yang.data.api.schema.builder.NormalizedNodeBuilder;
  24 import org.opendaylight.yangtools.yang.data.api.schema.stream.ForwardingNormalizedNodeStreamWriter;
  25 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  26 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter.MountPointExtension;
  27 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedMountpoints.Builder;
  28
  29 // FIXME: document usage of this
  30 @Beta
  31 public abstract class ImmutableMountPointNormalizedNodeStreamWriter extends ImmutableNormalizedNodeStreamWriter
  32         implements MountPointExtension {
  33     @NonNullByDefault
  34     private record BuilderEntry(PathArgument identifier, Builder builder) {
  35         BuilderEntry {
  36             requireNonNull(identifier);
  37             requireNonNull(builder);
  38         }
  39     }
  40
  41     private final Deque<BuilderEntry> builders = new ArrayDeque<>();
  42     private final NormalizationResultHolder holder;
  43
  44     protected ImmutableMountPointNormalizedNodeStreamWriter(final NormalizationResultHolder holder) {
  45         super(holder);
  46         this.holder = requireNonNull(holder);
  47     }
  48
  49     @Override
  50     public final List<MountPointExtension> supportedExtensions() {
  51         return List.of(this);
  52     }
  53
  54     @Override
  55     public final NormalizedNodeStreamWriter startMountPoint(final MountPointLabel label,
  56             final MountPointContext mountCtx) {
  57         final var current = builders.peek();
  58         checkState(current != null, "Attempted to emit mount point when no data is open");
  59
  60         final var mountResult = new NormalizationResultHolder();
  61         final var mountDelegate = ImmutableNormalizedNodeStreamWriter.from(mountResult);
  62
  63         return new ForwardingNormalizedNodeStreamWriter() {
  64             @Override
  65             protected NormalizedNodeStreamWriter delegate() {
  66                 return mountDelegate;
  67             }
  68
  69             @Override
  70             public void close() throws IOException {
  71                 super.close();
  72
  73                 final var result = mountResult.getResult();
  74                 final var data = result.data();
  75                 if (!(data instanceof ContainerNode container)) {
  76                     throw new IOException("Unhandled mount data " + data);
  77                 }
  78
  79                 current.builder.withMountPoint(new ImmutableNormalizedMountPoint(label, mountCtx, container,
  80                     result.metadata(), result.mountPoints()));
  81             }
  82         };
  83     }
  84
  85     @Override
  86     @SuppressWarnings("rawtypes")
  87     final void enter(final PathArgument identifier, final NormalizedNodeBuilder next) {
  88         super.enter(identifier, next);
  89         builders.push(new BuilderEntry(identifier, ImmutableNormalizedMountpoints.builder()));
  90     }
  91
  92     @Override
  93     public final void endNode() {
  94         super.endNode();
  95
  96         final var last = builders.pop();
  97         final var mountPoints = last.builder.build();
  98         final var current = builders.peek();
  99         if (current != null) {
 100             if (mountPoints.mountPoint() != null || !mountPoints.getChildren().isEmpty()) {
 101                 current.builder.withChild(last.identifier, mountPoints);
 102             }
 103         } else {
 104             // All done
 105             holder.setMountPoints(mountPoints);
 106         }
 107     }
 108 }
 109