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.Function;
  14 import com.google.common.base.VerifyException;
  15 import com.google.common.collect.Iterators;
  16 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  17 import java.lang.invoke.MethodHandles;
  18 import java.lang.invoke.VarHandle;
  19 import java.util.Iterator;
  20 import java.util.Map.Entry;
  21 import java.util.Spliterator;
  22 import java.util.stream.Stream;
  23 import org.eclipse.jdt.annotation.NonNullByDefault;
  24 import org.eclipse.jdt.annotation.Nullable;
  25 import org.gaul.modernizer_maven_annotations.SuppressModernizer;
  26 import org.opendaylight.mdsal.binding.api.query.QueryResult;
  27 import org.opendaylight.mdsal.binding.dom.codec.api.BindingCodecTree;
  28 import org.opendaylight.mdsal.binding.dom.codec.api.BindingCodecTreeNode;
  29 import org.opendaylight.mdsal.binding.dom.codec.api.BindingDataObjectCodecTreeNode;
  30 import org.opendaylight.mdsal.dom.api.query.DOMQueryResult;
  31 import org.opendaylight.yangtools.yang.binding.DataObject;
  32 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  33 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  34 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  35
  36 @NonNullByDefault
  37 @SuppressModernizer
  38 final class DefaultQueryResult<T extends DataObject>
  39         implements QueryResult<T>, Function<Entry<YangInstanceIdentifier, NormalizedNode>, QueryResult.Item<T>> {
  40     private static final VarHandle ITEM_CODEC;
  41
  42     static {
  43         try {
  44             ITEM_CODEC = MethodHandles.lookup().findVarHandle(DefaultQueryResult.class,
  45                 "itemCodec", BindingDataObjectCodecTreeNode.class);
  46         } catch (NoSuchFieldException | IllegalAccessException e) {
  47             throw new ExceptionInInitializerError(e);
  48         }
  49     }
  50
  51     private final DOMQueryResult domResult;
  52     private final BindingCodecTree codec;
  53
  54     @SuppressWarnings("unused")
  55     @SuppressFBWarnings(value = "NP_STORE_INTO_NONNULL_FIELD", justification = "Ungrokked type annotation")
  56     private volatile @Nullable BindingDataObjectCodecTreeNode<T> itemCodec = null;
  57
  58     DefaultQueryResult(final BindingCodecTree codec, final DOMQueryResult domResult) {
  59         this.codec = requireNonNull(codec);
  60         this.domResult = requireNonNull(domResult);
  61     }
  62
  63     @Override
  64     public Iterator<Item<T>> iterator() {
  65         return Iterators.transform(domResult.iterator(), this);
  66     }
  67
  68     @Override
  69     public Spliterator<Item<T>> spliterator() {
  70         return new DefaultQueryResultSpliterator<>(this, domResult.spliterator());
  71     }
  72
  73     @Override
  74     public Stream<Item<T>> stream() {
  75         return domResult.stream().map(this);
  76     }
  77
  78     @Override
  79     public Stream<Item<T>> parallelStream() {
  80         return domResult.parallelStream().map(this);
  81     }
  82
  83     @Override
  84     public Item<T> apply(final Entry<YangInstanceIdentifier, NormalizedNode> domItem) {
  85         return new DefaultQueryResultItem<>(this, domItem);
  86     }
  87
  88     T createObject(final Entry<YangInstanceIdentifier, NormalizedNode> domItem) {
  89         final @Nullable BindingDataObjectCodecTreeNode<T> local =
  90             (BindingDataObjectCodecTreeNode<T>) ITEM_CODEC.getAcquire(this);
  91         return (local != null ? local : loadItemCodec(domItem.getKey())).deserialize(domItem.getValue());
  92     }
  93
  94     InstanceIdentifier<T> createPath(final YangInstanceIdentifier domPath) {
  95         return verifyNotNull(codec.getInstanceIdentifierCodec().toBinding(domPath), "path");
  96     }
  97
  98     private BindingDataObjectCodecTreeNode<T> loadItemCodec(final YangInstanceIdentifier domPath) {
  99         final BindingCodecTreeNode codecNode = codec.getSubtreeCodec(domPath);
 100         if (!(codecNode instanceof BindingDataObjectCodecTreeNode)) {
 101             throw new VerifyException("Unexpected codec " + codecNode);
 102         }
 103
 104         @SuppressWarnings("unchecked")
 105         final BindingDataObjectCodecTreeNode<T> ret = (BindingDataObjectCodecTreeNode<T>) codecNode;
 106         final Object witness = ITEM_CODEC.compareAndExchangeRelease(this, null, ret);
 107         return witness == null ? ret : (BindingDataObjectCodecTreeNode<T>) witness;
 108     }
 109 }