com.concentricsky.android.khanacademy.data.remote.UserVideoDeserializerModule.java Source code

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Here is the source code for com.concentricsky.android.khanacademy.data.remote.UserVideoDeserializerModule.java

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/*
Viewer for Khan Academy
Copyright (C) 2012 Concentric Sky, Inc.
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.concentricsky.android.khanacademy.data.remote;

import java.io.IOException;
import java.util.Iterator;

import com.concentricsky.android.khanacademy.data.db.UserVideo;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.TreeNode;
import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.node.ObjectNode;

public class UserVideoDeserializerModule extends SimpleModule {
    private static final long serialVersionUID = 1990628478880621620L;

    private ObjectMapper defaultMapper;

    public UserVideoDeserializerModule() {
        super("UserVideoDeserializerModule",
                new Version(1, 0, 0, null, "com.concentricsky.android", "khanacademy"));
        this.addDeserializer(UserVideo.class, new UserVideoDeserializer());
        defaultMapper = new ObjectMapper();
    }

    public final class UserVideoDeserializer extends StdScalarDeserializer<UserVideo> {
        private static final long serialVersionUID = 5540210306258763322L;

        public UserVideoDeserializer() {
            super(UserVideo.class);
        }

        @Override
        public UserVideo deserialize(JsonParser jp, DeserializationContext ctxt)
                throws IOException, JsonProcessingException {

            TreeNode tree = defaultMapper.readTree(jp);

            ObjectNode root = (ObjectNode) tree;
            Iterator<String> keys = root.fieldNames();

            while (keys.hasNext()) {
                String key = keys.next();
                if ("video".equals(key)) {
                    JsonNode value = root.get(key);
                    if (value.isObject()) {
                        root.set(key, value.get("readable_id"));
                    }
                }
            }

            UserVideo video = defaultMapper.treeToValue(tree, UserVideo.class);
            return video;
        }

    }

}