*/
package org.opendaylight.mdsal.binding.dom.codec.impl;
-import com.google.common.cache.Cache;
-import com.google.common.cache.CacheBuilder;
-import java.util.concurrent.Callable;
-import java.util.concurrent.ExecutionException;
-import org.opendaylight.mdsal.binding.spec.reflect.BindingReflections;
import org.opendaylight.yangtools.concepts.IllegalArgumentCodec;
-import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
-import org.opendaylight.yangtools.yang.model.api.type.BitsTypeDefinition;
-import org.opendaylight.yangtools.yang.model.api.type.EnumTypeDefinition;
/**
* Value codec, which serializes / deserializes values from DOM simple values.
*/
// FIXME: IllegalArgumentCodec is perhaps not appropriate here due to null behavior
abstract class ValueTypeCodec implements IllegalArgumentCodec<Object, Object> {
- /*
- * Use identity comparison for keys and allow classes to be GCd themselves.
- *
- * Since codecs can (and typically do) hold a direct or indirect strong reference to the class, they need to be also
- * accessed via reference. Using a weak reference could be problematic, because the codec would quite often be only
- * weakly reachable. We therefore use a soft reference, whose implementation guidance is suitable to our use case:
- *
- * "Virtual machine implementations are, however, encouraged to bias against clearing recently-created or
- * recently-used soft references."
- */
- private static final Cache<Class<?>, SchemaUnawareCodec> STATIC_CODECS = CacheBuilder.newBuilder()
- .weakKeys().softValues().build();
- /**
- * Marker interface for codecs, which functionality will not be affected by schema change (introduction of new YANG
- * modules) they may have one static instance generated when first time needed.
- */
- // FIXME: IllegalArgumentCodec is perhaps not appropriate here due to null behavior
- interface SchemaUnawareCodec extends IllegalArgumentCodec<Object, Object> {
-
- }
-
- /**
- * No-op Codec, Java YANG Binding uses same types as NormalizedNode model for base YANG types, representing numbers,
- * binary, strings and empty.
- */
- public static final SchemaUnawareCodec NOOP_CODEC = new SchemaUnawareCodec() {
- @Override
- public Object serialize(final Object input) {
- return input;
- }
-
- @Override
- public Object deserialize(final Object input) {
- return input;
- }
- };
-
- public static SchemaUnawareCodec getCodecFor(final Class<?> typeClz, final TypeDefinition<?> def) {
- if (BindingReflections.isBindingClass(typeClz)) {
- return getCachedSchemaUnawareCodec(typeClz, getCodecLoader(typeClz, def));
- }
- return NOOP_CODEC;
- }
-
- private static SchemaUnawareCodec getCachedSchemaUnawareCodec(final Class<?> typeClz,
- final Callable<? extends SchemaUnawareCodec> loader) {
- try {
- return STATIC_CODECS.get(typeClz, loader);
- } catch (ExecutionException e) {
- throw new IllegalStateException(e);
- }
- }
-
- private static Callable<? extends SchemaUnawareCodec> getCodecLoader(final Class<?> typeClz,
- final TypeDefinition<?> def) {
-
- TypeDefinition<?> rootType = def;
- while (rootType.getBaseType() != null) {
- rootType = rootType.getBaseType();
- }
- if (rootType instanceof EnumTypeDefinition) {
- return EnumerationCodec.loader(typeClz, (EnumTypeDefinition) rootType);
- } else if (rootType instanceof BitsTypeDefinition) {
- return BitsCodec.loader(typeClz, (BitsTypeDefinition) rootType);
- }
- return EncapsulatedValueCodec.loader(typeClz, def);
- }
-
- @SuppressWarnings("rawtypes")
- static ValueTypeCodec encapsulatedValueCodecFor(final Class<?> typeClz, final TypeDefinition<?> typeDef,
- final IllegalArgumentCodec delegate) {
- SchemaUnawareCodec extractor = getCachedSchemaUnawareCodec(typeClz,
- EncapsulatedValueCodec.loader(typeClz, typeDef));
- return new CompositeValueCodec(extractor, delegate);
- }
}