jetbrains.buildServer.sharedResources.server.report.UsedResourcesSerializer.java Source code

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Here is the source code for jetbrains.buildServer.sharedResources.server.report.UsedResourcesSerializer.java

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/*
 * Copyright 2000-2018 JetBrains s.r.o.
 *
 * 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 jetbrains.buildServer.sharedResources.server.report;

import com.google.gson.*;
import com.google.gson.internal.Streams;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import java.util.Collection;
import java.util.List;
import jetbrains.buildServer.sharedResources.model.Lock;
import jetbrains.buildServer.sharedResources.model.LockType;
import jetbrains.buildServer.sharedResources.model.resources.*;
import org.jetbrains.annotations.NotNull;

/**
 * Created with IntelliJ IDEA.
 *
 * @author Oleg Rybak (oleg.rybak@jetbrains.com)
 */
public class UsedResourcesSerializer {

    public List<UsedResource> read(@NotNull final Reader reader) {
        final GsonBuilder builder = new GsonBuilder();
        builder.setFieldNamingStrategy(STRATEGY);
        builder.registerTypeAdapter(Resource.class,
                (InstanceCreator<Resource>) type -> ResourceFactory.newInfiniteResource("", "", "", true));
        builder.registerTypeAdapter(Lock.class, (InstanceCreator<Lock>) type -> new Lock("", LockType.READ, ""));
        builder.registerTypeAdapterFactory(MY_TYPE_ADAPTER_FACTORY);
        return builder.setPrettyPrinting().create().fromJson(reader, new TypeToken<List<UsedResource>>() {
        }.getType());
    }

    public void write(Collection<UsedResource> usedResources, Writer writer) {
        final GsonBuilder builder = new GsonBuilder();
        builder.setFieldNamingStrategy(STRATEGY);
        builder.setPrettyPrinting();
        builder.create().toJson(usedResources, writer);
    }

    private static final FieldNamingStrategy STRATEGY = field -> {
        String name = field.getName();
        if (name.startsWith("my")) {
            char c[] = name.substring(2).toCharArray();
            c[0] = Character.toLowerCase(c[0]);
            return new String(c);
        } else {
            return name;
        }
    };

    private final TypeAdapterFactory MY_TYPE_ADAPTER_FACTORY = new CustomTypeAdapterFactory();

    private static final class CustomTypeAdapterFactory implements TypeAdapterFactory {
        @Override
        public <T> TypeAdapter<T> create(final Gson gson, final TypeToken<T> type) {
            if (type.getRawType() != Resource.class) {
                return null;
            }

            final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);

            return new TypeAdapter<T>() {
                @Override
                public void write(final JsonWriter jsonWriter, final T t) throws IOException {
                    delegate.write(jsonWriter, t);
                }

                @SuppressWarnings("unchecked")
                @Override
                public T read(final JsonReader jsonReader) throws JsonParseException {
                    JsonElement tree = Streams.parse(jsonReader);
                    JsonObject object = tree.getAsJsonObject();
                    if (object.has("type")) {
                        ResourceType resourceType = ResourceType.fromString(object.get("type").getAsString());
                        if (resourceType == ResourceType.QUOTED) {
                            return (T) gson.getDelegateAdapter(CustomTypeAdapterFactory.this,
                                    TypeToken.get(QuotedResource.class)).fromJsonTree(tree);
                        } else if (resourceType == ResourceType.CUSTOM) {
                            return (T) gson.getDelegateAdapter(CustomTypeAdapterFactory.this,
                                    TypeToken.get(CustomResource.class)).fromJsonTree(tree);
                        }
                    }
                    throw new JsonParseException(
                            "Cannot deserialize " + type + ". It is not a valid Resource JSON.");
                }
            };
        }
    }
}