2 * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.mdsal.binding.dom.codec.impl;
10 import com.google.common.cache.Cache;
11 import com.google.common.cache.CacheBuilder;
12 import java.util.concurrent.Callable;
13 import java.util.concurrent.ExecutionException;
14 import org.opendaylight.mdsal.binding.spec.reflect.BindingReflections;
15 import org.opendaylight.yangtools.concepts.Codec;
16 import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
17 import org.opendaylight.yangtools.yang.model.api.type.BitsTypeDefinition;
18 import org.opendaylight.yangtools.yang.model.api.type.EnumTypeDefinition;
21 * Value codec, which serializes / deserializes values from DOM simple values.
23 abstract class ValueTypeCodec implements Codec<Object, Object> {
25 * Use identity comparison for keys and allow classes to be GCd themselves.
27 * Since codecs can (and typically do) hold a direct or indirect strong reference to the class, they need to be also
28 * accessed via reference. Using a weak reference could be problematic, because the codec would quite often be only
29 * weakly reachable. We therefore use a soft reference, whose implementation guidance is suitable to our use case:
31 * "Virtual machine implementations are, however, encouraged to bias against clearing recently-created or
32 * recently-used soft references."
34 private static final Cache<Class<?>, SchemaUnawareCodec> STATIC_CODECS = CacheBuilder.newBuilder()
35 .weakKeys().softValues().build();
38 * Marker interface for codecs, which functionality will not be affected by schema change (introduction of new YANG
39 * modules) they may have one static instance generated when first time needed.
41 interface SchemaUnawareCodec extends Codec<Object,Object> {
46 * No-op Codec, Java YANG Binding uses same types as NormalizedNode model for base YANG types, representing numbers,
47 * binary, strings and empty.
49 public static final SchemaUnawareCodec NOOP_CODEC = new SchemaUnawareCodec() {
51 public Object serialize(final Object input) {
56 public Object deserialize(final Object input) {
61 public static SchemaUnawareCodec getCodecFor(final Class<?> typeClz, final TypeDefinition<?> def) {
62 if (BindingReflections.isBindingClass(typeClz)) {
63 return getCachedSchemaUnawareCodec(typeClz, getCodecLoader(typeClz, def));
68 private static SchemaUnawareCodec getCachedSchemaUnawareCodec(final Class<?> typeClz,
69 final Callable<? extends SchemaUnawareCodec> loader) {
71 return STATIC_CODECS.get(typeClz, loader);
72 } catch (ExecutionException e) {
73 throw new IllegalStateException(e);
77 private static Callable<? extends SchemaUnawareCodec> getCodecLoader(final Class<?> typeClz,
78 final TypeDefinition<?> def) {
80 TypeDefinition<?> rootType = def;
81 while (rootType.getBaseType() != null) {
82 rootType = rootType.getBaseType();
84 if (rootType instanceof EnumTypeDefinition) {
85 return EnumerationCodec.loader(typeClz, (EnumTypeDefinition) rootType);
86 } else if (rootType instanceof BitsTypeDefinition) {
87 return BitsCodec.loader(typeClz, (BitsTypeDefinition) rootType);
89 return EncapsulatedValueCodec.loader(typeClz, def);
92 @SuppressWarnings("rawtypes")
93 static ValueTypeCodec encapsulatedValueCodecFor(final Class<?> typeClz, final TypeDefinition<?> typeDef,
94 final Codec delegate) {
95 SchemaUnawareCodec extractor = getCachedSchemaUnawareCodec(typeClz,
96 EncapsulatedValueCodec.loader(typeClz, typeDef));
97 return new CompositeValueCodec(extractor, delegate);