binding/mdsal-binding-dom-codec/src/main/java/org/opendaylight/mdsal/binding/dom/codec/impl/IdentityCodec.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.mdsal.binding.dom.codec.impl;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import com.google.common.base.Throwables;
  13 import com.google.common.cache.CacheBuilder;
  14 import com.google.common.cache.CacheLoader;
  15 import com.google.common.cache.LoadingCache;
  16 import java.lang.reflect.Field;
  17 import java.lang.reflect.Modifier;
  18 import java.util.concurrent.ExecutionException;
  19 import org.eclipse.jdt.annotation.NonNull;
  20 import org.opendaylight.mdsal.binding.dom.codec.api.BindingIdentityCodec;
  21 import org.opendaylight.mdsal.binding.runtime.api.BindingRuntimeContext;
  22 import org.opendaylight.mdsal.binding.spec.naming.BindingMapping;
  23 import org.opendaylight.mdsal.binding.spec.reflect.BindingReflections;
  24 import org.opendaylight.yangtools.concepts.AbstractIllegalArgumentCodec;
  25 import org.opendaylight.yangtools.yang.binding.BaseIdentity;
  26 import org.opendaylight.yangtools.yang.common.QName;
  27
  28 final class IdentityCodec extends AbstractIllegalArgumentCodec<QName, BaseIdentity> implements BindingIdentityCodec {
  29     private final LoadingCache<@NonNull QName, @NonNull BaseIdentity> values = CacheBuilder.newBuilder()
  30         .build(new CacheLoader<>() {
  31             @Override
  32             public BaseIdentity load(final QName key) {
  33                 final var clazz = context.getIdentityClass(key);
  34                 final Field field;
  35                 try {
  36                     field = clazz.getField(BindingMapping.VALUE_STATIC_FIELD_NAME);
  37                 } catch (NoSuchFieldException e) {
  38                     throw new LinkageError(clazz + " does not define required field "
  39                         + BindingMapping.VALUE_STATIC_FIELD_NAME, e);
  40                 }
  41                 if (!Modifier.isStatic(field.getModifiers())) {
  42                     throw new LinkageError(field + " is not static");
  43                 }
  44
  45                 final Object value;
  46                 try {
  47                     value = clazz.cast(field.get(null));
  48                 } catch (IllegalAccessException e) {
  49                     throw new LinkageError(field + " is not accesssible", e);
  50                 }
  51                 if (value == null) {
  52                     throw new LinkageError(field + " is null");
  53                 }
  54                 try {
  55                     return clazz.cast(value);
  56                 } catch (ClassCastException e) {
  57                     throw new LinkageError(field + " value " + value + " has illegal type", e);
  58                 }
  59             }
  60         });
  61
  62     private final BindingRuntimeContext context;
  63
  64     IdentityCodec(final BindingRuntimeContext context) {
  65         this.context = requireNonNull(context);
  66     }
  67
  68     @Override
  69     protected BaseIdentity deserializeImpl(final QName input) {
  70         return toBinding(input);
  71     }
  72
  73     @Override
  74     protected QName serializeImpl(final BaseIdentity input) {
  75         return fromBinding(input);
  76     }
  77
  78     @Override
  79     @SuppressWarnings("unchecked")
  80     public <T extends BaseIdentity> T toBinding(final QName qname) {
  81         try {
  82             return (T) values.get(requireNonNull(qname));
  83         } catch (ExecutionException e) {
  84             Throwables.throwIfUnchecked(e.getCause());
  85             throw new IllegalStateException("Unexpected error translating " + qname, e);
  86         }
  87     }
  88
  89     @Override
  90     public QName fromBinding(final BaseIdentity bindingValue) {
  91         return BindingReflections.getQName(bindingValue.implementedInterface());
  92     }
  93 }