com.ibm.common.activitystreams.util.AbstractDictionaryObjectAdapter.java Source code

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Here is the source code for com.ibm.common.activitystreams.util.AbstractDictionaryObjectAdapter.java

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/**
 * Copyright 2013 OpenSocial Foundation
 * Copyright 2013 International Business Machines Corporation
 *
 * 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.
 *
 * Utility library for working with Activity Streams Actions
 * Requires underscorejs.
 *
 * @author James M Snell (jasnell@us.ibm.com)
 */
package com.ibm.common.activitystreams.util;

import static com.google.common.base.Preconditions.checkArgument;

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

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.ibm.common.activitystreams.internal.Adapter;

/**
 * Abstract base GSON Serializer for AbstractDictionaryObject
 * instances.
 * @author james
 * @version $Revision: 1.0 $
 */
public abstract class AbstractDictionaryObjectAdapter<Y, X extends AbstractDictionaryObject<Y>, B extends AbstractDictionaryObject.AbstractBuilder<Y, X, B>>
        extends Adapter<X> {

    private final Class<Y> klass;

    /**
     * Constructor for AbstractDictionaryObjectAdapter.
     * @param klass Class<Y>
     */
    protected AbstractDictionaryObjectAdapter(Class<Y> klass) {
        this.klass = klass;
    }

    public JsonElement serialize(X x, Type type, JsonSerializationContext context) {
        JsonObject obj = new JsonObject();
        for (String key : x)
            obj.add(key, context.serialize(x.getSingle(key), klass));
        return obj;
    }

    public X deserialize(JsonElement element, Type type1, JsonDeserializationContext context)
            throws JsonParseException {
        checkArgument(element.isJsonObject());
        try {
            JsonObject obj = element.getAsJsonObject();
            B builder = builder();
            for (Entry<String, JsonElement> entry : obj.entrySet())
                builder.set(entry.getKey(), context.<Y>deserialize(entry.getValue(), klass));
            return builder.get();
        } catch (Throwable t) {
            t.printStackTrace();
            throw new IllegalArgumentException();
        }
    }

    protected abstract B builder();
}