org.springframework.social.facebook.api.impl.json.CommentListAndCountDeserializer.java Source code

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Here is the source code for org.springframework.social.facebook.api.impl.json.CommentListAndCountDeserializer.java

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/*
 * Copyright 2013 the original author or 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 org.springframework.social.facebook.api.impl.json;

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

import org.springframework.social.facebook.api.Comment;
import org.springframework.social.facebook.api.ListAndCount;

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;

class CommentListAndCountDeserializer extends JsonDeserializer<ListAndCount<Comment>> {

    @SuppressWarnings("unchecked")
    @Override
    public ListAndCount<Comment> deserialize(JsonParser jp, DeserializationContext ctxt)
            throws IOException, JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();
        mapper.registerModule(new FacebookModule());
        jp.setCodec(mapper);
        if (jp.hasCurrentToken()) {
            JsonNode commentsNode = jp.readValueAs(JsonNode.class);
            JsonNode dataNode = commentsNode.get("data");
            List<Comment> commentsList = dataNode != null
                    ? (List<Comment>) mapper.reader(new TypeReference<List<Comment>>() {
                    }).readValue(dataNode)
                    : Collections.<Comment>emptyList();
            JsonNode countNode = commentsNode.get("count");
            int commentCount = countNode != null ? countNode.intValue() : 0;
            return new ListAndCount<Comment>(commentsList, commentCount);
        }

        return null;
    }
}