NormTypeDeserializer.java

/*
 * Copyright [2013-2015] PayPal Software Foundation
 *
 * 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 ml.shifu.shifu.container.obj;

import java.io.IOException;

import ml.shifu.shifu.container.obj.ModelNormalizeConf.NormType;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.ObjectCodec;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;

/**
 * To de-serialize {@link NormType} instance and ignore cases.
 * 
 * @author Zhang David (pengzhang@paypal.com)
 */
public class NormTypeDeserializer extends JsonDeserializer<NormType> {

    /*
     * (non-Javadoc)
     * 
     * @see com.fasterxml.jackson.databind.JsonDeserializer#deserialize(com.fasterxml.jackson.core.JsonParser,
     * com.fasterxml.jackson.databind.DeserializationContext)
     */
    @Override
    public NormType deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
        ObjectCodec oc = jp.getCodec();
        JsonNode node = oc.readTree(jp);

        for(NormType value: NormType.values()) {
            if(value.name().equalsIgnoreCase(node.textValue())) {
                return value;
            }
        }
        return null;
    }
}