binding/mdsal-binding-dom-adapter/src/main/java/org/opendaylight/mdsal/binding/dom/adapter/query/DefaultQueryFactory.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 java.util.Objects.requireNonNull;
  11
  12 import com.google.common.annotations.Beta;
  13 import com.google.common.base.Throwables;
  14 import com.google.common.cache.CacheBuilder;
  15 import com.google.common.cache.CacheLoader;
  16 import com.google.common.cache.LoadingCache;
  17 import java.util.ServiceLoader;
  18 import java.util.concurrent.ExecutionException;
  19 import javax.inject.Inject;
  20 import javax.inject.Singleton;
  21 import org.eclipse.jdt.annotation.NonNull;
  22 import org.kohsuke.MetaInfServices;
  23 import org.opendaylight.mdsal.binding.api.query.DescendantQueryBuilder;
  24 import org.opendaylight.mdsal.binding.api.query.QueryFactory;
  25 import org.opendaylight.mdsal.binding.api.query.QueryStructureException;
  26 import org.opendaylight.mdsal.binding.dom.codec.api.BindingCodecTree;
  27 import org.opendaylight.mdsal.binding.dom.codec.spi.BindingSchemaMapping;
  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.NodeIdentifier;
  31 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
  32 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
  33 import org.slf4j.Logger;
  34 import org.slf4j.LoggerFactory;
  35
  36 @Beta
  37 @MetaInfServices
  38 @Singleton
  39 public final class DefaultQueryFactory implements QueryFactory {
  40     private static final class MethodId {
  41         final DataNodeContainer parent;
  42         final String methodName;
  43
  44         MethodId(final DataNodeContainer parent, final String methodName) {
  45             this.parent = requireNonNull(parent);
  46             this.methodName = requireNonNull(methodName);
  47         }
  48
  49         @Override
  50         public int hashCode() {
  51             return parent.hashCode() * 31 + methodName.hashCode();
  52         }
  53
  54         @Override
  55         public boolean equals(final Object obj) {
  56             if (!(obj instanceof MethodId)) {
  57                 return false;
  58             }
  59             final MethodId other = (MethodId) obj;
  60             return methodName.equals(other.methodName) && parent.equals(other.parent);
  61         }
  62     }
  63
  64     private static final Logger LOG = LoggerFactory.getLogger(DefaultQueryFactory.class);
  65
  66     private final LoadingCache<MethodId, NodeIdentifier> knownMethods = CacheBuilder.newBuilder().build(
  67         new CacheLoader<MethodId, NodeIdentifier>() {
  68             @Override
  69             public NodeIdentifier load(final MethodId key) {
  70                 final DataNodeContainer parent = key.parent;
  71                 final String methodName = key.methodName;
  72
  73                 for (DataSchemaNode child : parent.getChildNodes()) {
  74                     if (methodName.equals(BindingSchemaMapping.getGetterMethodName(child))) {
  75                         return NodeIdentifier.create(child.getQName());
  76                     }
  77                 }
  78                 throw new QueryStructureException("Failed to find schema matching " + methodName + " in " + parent);
  79             }
  80         });
  81     private final @NonNull BindingCodecTree codec;
  82
  83     public DefaultQueryFactory() {
  84         this(ServiceLoader.load(BindingCodecTree.class).findFirst().orElseThrow());
  85     }
  86
  87     @Inject
  88     public DefaultQueryFactory(final BindingCodecTree codec) {
  89         this.codec = requireNonNull(codec);
  90     }
  91
  92     @Override
  93     public <T extends DataObject> DescendantQueryBuilder<T> querySubtree(final InstanceIdentifier<T> rootPath) {
  94         return new DefaultDescendantQueryBuilder<>(this, rootPath);
  95     }
  96
  97     @NonNull BindingCodecTree codec() {
  98         return codec;
  99     }
 100
 101     @NonNull NodeIdentifier findChild(final DataNodeContainer parent, final String methodName) {
 102         try {
 103             return knownMethods.get(new MethodId(parent, methodName));
 104         } catch (ExecutionException e) {
 105             LOG.debug("Failed to find method for {}", methodName, e);
 106             final Throwable cause = e.getCause();
 107             Throwables.throwIfUnchecked(cause);
 108             throw new IllegalStateException("Failed to load cache", e);
 109         }
 110     }
 111 }