/*
    * 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 com.addthis.codec.jackson;
  
  import java.io.IOException;
  
  import com.fasterxml.jackson.core.JsonParser;
  import com.fasterxml.jackson.core.JsonToken;
  import com.fasterxml.jackson.databind.DeserializationContext;
  import com.fasterxml.jackson.databind.deser.std.EnumDeserializer;
  import com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer;
  import com.fasterxml.jackson.databind.node.TextNode;
  
  // ignores case when deserializing enums
  public class CaseIgnoringEnumDeserializer extends StdScalarDeserializer<Enum<?>> {
      private final EnumDeserializer base;
  
      public CaseIgnoringEnumDeserializer(EnumDeserializer base) {
          super(Enum.class);
          this.base = base;
      }
  
      @Override
      public Enum<?> deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
          JsonToken curr = jp.getCurrentToken();
  
          if ((curr == JsonToken.VALUE_STRING) || (curr == JsonToken.FIELD_NAME)
              || (curr == JsonToken.VALUE_FALSE) || (curr == JsonToken.VALUE_TRUE)) {
              String name = jp.getText();
              TextNode upperName = ctxt.getNodeFactory().textNode(name.toUpperCase());
  
              JsonParser treeParser = jp.getCodec().treeAsTokens(upperName);
              treeParser.nextToken();
              return base.deserialize(treeParser, ctxt);
          } else {
              return base.deserialize(jp, ctxt);
          }
      }
  }