org.agorava.facebook.jackson.ReferenceListDeserializer.java Source code

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Here is the source code for org.agorava.facebook.jackson.ReferenceListDeserializer.java

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/*
 * Copyright 2013 Agorava
 *
 * 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 org.agorava.facebook.jackson;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.agorava.facebook.model.Reference;

import java.io.IOException;
import java.util.Collections;
import java.util.List;

import static org.agorava.api.atinject.BeanResolver.getInstance;

class ReferenceListDeserializer extends JsonDeserializer<List<Reference>> {
    @SuppressWarnings("unchecked")
    @Override
    public List<Reference> deserialize(JsonParser jp, DeserializationContext ctxt)
            throws IOException, JsonProcessingException {
        ObjectMapper mapper = getInstance().resolve(ObjectMapper.class);
        jp.setCodec(mapper);
        if (jp.hasCurrentToken()) {
            JsonNode dataNode = (JsonNode) jp.readValueAs(JsonNode.class).get("data");
            if (dataNode != null) {
                return (List<Reference>) mapper.reader(new TypeReference<List<Reference>>() {
                }).readValue(dataNode);
            }
        }

        return Collections.emptyList();
    }
}