Java tutorial
package org.xacml4j.v30.marshal.json; /* * #%L * Xacml4J Gson Integration * %% * Copyright (C) 2009 - 2014 Xacml4J.org * %% * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser 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 Lesser Public License for more details. * * You should have received a copy of the GNU General Lesser Public * License along with this program. If not, see * <http://www.gnu.org/licenses/lgpl-3.0.html>. * #L% */ import java.lang.reflect.Type; import java.util.Collection; import org.xacml4j.v30.CategoryReference; import org.xacml4j.v30.RequestReference; 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; import com.google.gson.JsonSerializationContext; import com.google.gson.JsonSerializer; import com.google.gson.reflect.TypeToken; final class RequestReferenceAdapter implements JsonDeserializer<RequestReference>, JsonSerializer<RequestReference> { private static final String REFERENCE_ID_PROPERTY = "ReferenceId"; @Override public RequestReference deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException { JsonObject o = json.getAsJsonObject(); Collection<CategoryReference> refs = context.deserialize(o.getAsJsonArray(REFERENCE_ID_PROPERTY), new TypeToken<Collection<CategoryReference>>() { }.getType()); return RequestReference.builder().reference(refs).build(); } @Override public JsonElement serialize(RequestReference src, Type typeOfSrc, JsonSerializationContext context) { JsonObject o = new JsonObject(); o.add(REFERENCE_ID_PROPERTY, context.serialize(src.getReferencedCategories())); return o; } }