binding/mdsal-binding-dom-adapter/src/main/java/org/opendaylight/mdsal/binding/dom/adapter/query/DefaultQueryResult.java

   1 /*
   2  * Copyright (c) 2020 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.mdsal.binding.dom.adapter.query;
   9
  10 import static com.google.common.base.Verify.verifyNotNull;
  11 import static java.util.Objects.requireNonNull;
  12
  13 import com.google.common.base.VerifyException;
  14 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  15 import java.lang.invoke.MethodHandles;
  16 import java.lang.invoke.VarHandle;
  17 import java.util.Map.Entry;
  18 import java.util.Spliterator;
  19 import java.util.function.Function;
  20 import java.util.stream.Stream;
  21 import org.eclipse.jdt.annotation.NonNullByDefault;
  22 import org.eclipse.jdt.annotation.Nullable;
  23 import org.opendaylight.mdsal.binding.api.query.QueryResult;
  24 import org.opendaylight.mdsal.binding.dom.codec.api.BindingCodecTree;
  25 import org.opendaylight.mdsal.binding.dom.codec.api.BindingCodecTreeNode;
  26 import org.opendaylight.mdsal.binding.dom.codec.api.BindingDataObjectCodecTreeNode;
  27 import org.opendaylight.mdsal.dom.api.query.DOMQueryResult;
  28 import org.opendaylight.yangtools.yang.binding.DataObject;
  29 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  30 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  31 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  32
  33 @NonNullByDefault
  34 final class DefaultQueryResult<T extends DataObject>
  35         implements QueryResult<T>, Function<Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>, QueryResult.Item<T>> {
  36     private static final VarHandle ITEM_CODEC;
  37
  38     static {
  39         try {
  40             ITEM_CODEC = MethodHandles.lookup().findVarHandle(DefaultQueryResult.class,
  41                 "itemCodec", BindingDataObjectCodecTreeNode.class);
  42         } catch (NoSuchFieldException | IllegalAccessException e) {
  43             throw new ExceptionInInitializerError(e);
  44         }
  45     }
  46
  47     private final DOMQueryResult domResult;
  48     private final BindingCodecTree codec;
  49
  50     @SuppressWarnings("unused")
  51     @SuppressFBWarnings(value = "NP_STORE_INTO_NONNULL_FIELD", justification = "Ungrokked type annotation")
  52     private volatile @Nullable BindingDataObjectCodecTreeNode<T> itemCodec = null;
  53
  54     DefaultQueryResult(final BindingCodecTree codec, final DOMQueryResult domResult) {
  55         this.codec = requireNonNull(codec);
  56         this.domResult = requireNonNull(domResult);
  57     }
  58
  59     @Override
  60     public Spliterator<? extends Item<T>> spliterator() {
  61         return new DefaultQueryResultSpliterator<>(this, domResult.spliterator());
  62     }
  63
  64     @Override
  65     public Stream<? extends Item<T>> stream() {
  66         return domResult.stream().map(this);
  67     }
  68
  69     @Override
  70     public Stream<? extends Item<T>> parallelStream() {
  71         return domResult.parallelStream().map(this);
  72     }
  73
  74     @Override
  75     public Item<T> apply(final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> domItem) {
  76         return new DefaultQueryResultItem<>(this, domItem);
  77     }
  78
  79     T createObject(final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> domItem) {
  80         final @Nullable BindingDataObjectCodecTreeNode<T> local =
  81             (BindingDataObjectCodecTreeNode<T>) ITEM_CODEC.getAcquire(this);
  82         return (local != null ? local : loadItemCodec(domItem.getKey())).deserialize(domItem.getValue());
  83     }
  84
  85     InstanceIdentifier<T> createPath(final YangInstanceIdentifier domPath) {
  86         return verifyNotNull(codec.getInstanceIdentifierCodec().toBinding(domPath), "path");
  87     }
  88
  89     private BindingDataObjectCodecTreeNode<T> loadItemCodec(final YangInstanceIdentifier domPath) {
  90         final BindingCodecTreeNode codecNode = codec.getSubtreeCodec(domPath);
  91         if (!(codecNode instanceof BindingDataObjectCodecTreeNode)) {
  92             throw new VerifyException("Unexpected codec " + codecNode);
  93         }
  94
  95         @SuppressWarnings("unchecked")
  96         final BindingDataObjectCodecTreeNode<T> ret = (BindingDataObjectCodecTreeNode<T>) codecNode;
  97         final Object witness = ITEM_CODEC.compareAndExchangeRelease(this, null, ret);
  98         return witness == null ? ret : (BindingDataObjectCodecTreeNode<T>) witness;
  99     }
 100 }