com.ibm.common.activitystreams.internal.MultimapAdapter.java Source code

Introduction

Here is the source code for com.ibm.common.activitystreams.internal.MultimapAdapter.java

Source

/**
 * 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.internal;

import static com.google.common.collect.Iterables.getFirst;
import static com.google.common.collect.Iterables.size;

import static com.ibm.common.activitystreams.internal.ASObjectAdapter.primConverter;

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

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.Multimap;
import com.google.gson.JsonArray;
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.ASObject;

/**
 * @author james
 * @version $Revision: 1.0 $
 */
@SuppressWarnings({ "rawtypes", "unchecked" })
final class MultimapAdapter extends Adapter<Multimap> {

    /**
     * Method getAdaptedClass.
        
     * @return Class<Multimap> */
    public Class<Multimap> getAdaptedClass() {
        return Multimap.class;
    }

    /**
     * Method serialize.
     * @param src Multimap
     * @param typeOfSrc Type
     * @param context JsonSerializationContext
        
     * @return JsonElement */
    public JsonElement serialize(Multimap src, Type typeOfSrc, JsonSerializationContext context) {
        JsonObject obj = new JsonObject();
        for (Object key : src.keySet()) {
            Iterable<Object> vals = src.get(key);
            if (size(vals) == 1) {
                Object f = getFirst(vals, null);
                if (f != null)
                    obj.add(key.toString(), context.serialize(f, f.getClass()));
            } else {
                obj.add(key.toString(), context.serialize(vals, Iterable.class));
            }
        }
        return obj;
    }

    /**
     * Method arraydes.
     * @param array JsonArray
     * @param context JsonDeserializationContext
        
     * @return ImmutableList<Object> */
    protected static ImmutableList<Object> arraydes(JsonArray array, JsonDeserializationContext context) {
        ImmutableList.Builder<Object> builder = ImmutableList.builder();
        for (JsonElement child : array)
            if (child.isJsonArray())
                builder.add(arraydes(child.getAsJsonArray(), context));
            else if (child.isJsonObject())
                builder.add(context.deserialize(child, ASObject.class));
            else if (child.isJsonPrimitive())
                builder.add(primConverter.convert(child.getAsJsonPrimitive()));
        return builder.build();
    }

    /**
     * Method deserialize.
     * @param json JsonElement
     * @param typeOfT Type
     * @param context JsonDeserializationContext
        
        
        
     * @return Multimap * @throws JsonParseException * @see com.google.gson.JsonDeserializer#deserialize(JsonElement, Type, JsonDeserializationContext) */
    public Multimap deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
            throws JsonParseException {
        ImmutableMultimap.Builder mm = ImmutableMultimap.builder();
        JsonObject obj = json.getAsJsonObject();
        for (Map.Entry<String, JsonElement> entry : obj.entrySet()) {
            String key = entry.getKey();
            JsonElement val = entry.getValue();
            if (val.isJsonArray()) {
                for (JsonElement el : val.getAsJsonArray()) {
                    if (el.isJsonArray())
                        mm.put(key, arraydes(el.getAsJsonArray(), context));
                    else if (el.isJsonObject())
                        mm.put(key, context.deserialize(el, ASObject.class));
                    else if (el.isJsonPrimitive())
                        mm.put(key, primConverter.convert(el.getAsJsonPrimitive()));
                }
            } else if (val.isJsonObject()) {
                mm.put(key, context.deserialize(val, ASObject.class));
            } else if (val.isJsonPrimitive()) {
                mm.put(key, primConverter.convert(val.getAsJsonPrimitive()));
            }
        }
        return mm.build();
    }

}