org.sprintapi.hyperdata.gson.GsonHyperDataDeserializer.java Source code

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Here is the source code for org.sprintapi.hyperdata.gson.GsonHyperDataDeserializer.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.sprintapi.hyperdata.gson;

import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.sprintapi.hyperdata.HyperHashMap;
import org.sprintapi.hyperdata.HyperMap;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;

public class GsonHyperDataDeserializer implements JsonDeserializer<HyperMap> {

    protected static String HREF_KEY = "href";

    @Override
    public HyperMap deserialize(JsonElement json, Type arg1, JsonDeserializationContext ctx)
            throws JsonParseException {

        if (!json.isJsonObject()) {
            throw new JsonParseException(
                    "Unexpected " + json.getClass().getSimpleName() + ", expected JsonObject object.");
        }

        JsonObject jsonObject = json.getAsJsonObject();
        HyperHashMap hdata = null;

        if (jsonObject != null) {
            hdata = new HyperHashMap();

            final Set<Entry<String, JsonElement>> entrySet = jsonObject.entrySet();
            if (entrySet != null) {

                Map<String, Object> metadata = null;

                for (Entry<String, JsonElement> entry : entrySet) {
                    if (entry.getKey().startsWith(Constants.META_CHAR)) {
                        if (metadata == null) {
                            metadata = new HashMap<String, Object>();
                        }
                        JsonElement value = entry.getValue();
                        if (value != null) {
                            metadata.put(entry.getKey().substring(1), ctx.deserialize(value,
                                    (value.isJsonObject()
                                            && value.getAsJsonObject().has(Constants.META_CHAR.concat(HREF_KEY)))
                                                    ? HyperMap.class
                                                    : Object.class));
                        }

                    } else {
                        JsonElement value = entry.getValue();
                        if (value != null) {
                            hdata.put(entry.getKey(), ctx.deserialize(value,
                                    (value.isJsonObject()
                                            && value.getAsJsonObject().has(Constants.META_CHAR.concat(HREF_KEY)))
                                                    ? HyperMap.class
                                                    : Object.class));
                        }
                    }
                }
                hdata.setMetadata(metadata);
            }
        }
        return hdata;
    }
}