Java tutorial
/** * Copyright 2015 The Javaslang Authors * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package javaslang.jackson.datatype.deserialize; import com.fasterxml.jackson.databind.DeserializationContext; import com.fasterxml.jackson.databind.JavaType; import com.fasterxml.jackson.databind.JsonDeserializer; import com.fasterxml.jackson.databind.JsonMappingException; import com.fasterxml.jackson.databind.deser.ResolvableDeserializer; import com.fasterxml.jackson.databind.deser.std.StdDeserializer; import com.fasterxml.jackson.databind.type.TypeFactory; import java.util.ArrayList; import java.util.List; abstract class ValueDeserializer<T> extends StdDeserializer<T> implements ResolvableDeserializer { private static final long serialVersionUID = 1L; private final JavaType javaType; private final int typeCount; private final List<JsonDeserializer<?>> deserializers; ValueDeserializer(JavaType valueType, int typeCount) { super(valueType); this.javaType = valueType; this.typeCount = typeCount; this.deserializers = new ArrayList<>(typeCount); } int deserializersCount() { return deserializers.size(); } JsonDeserializer<?> deserializer(int index) { return deserializers.get(index); } @Override public void resolve(DeserializationContext ctxt) throws JsonMappingException { for (int i = 0; i < typeCount; i++) { if (i < javaType.containedTypeCount()) { deserializers.add(ctxt.findRootValueDeserializer(javaType.containedType(i))); } else { deserializers.add(ctxt.findContextualValueDeserializer(TypeFactory.unknownType(), null)); } } } }