DataMappingService.java

/**
 * Copyright (C) 2013-2014 Project-Vethrfolnir
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.vethrfolnir.services;

import java.io.File;
import java.io.InputStream;
import java.util.ArrayList;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.core.JsonParser.Feature;
import com.fasterxml.jackson.core.util.DefaultPrettyPrinter;
import com.fasterxml.jackson.core.util.DefaultPrettyPrinter.Lf2SpacesIndenter;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.type.TypeFactory;
import com.vethrfolnir.logging.MuLogger;
import com.vethrfolnir.services.assets.AssetManager;
import com.vethrfolnir.services.assets.key.FileKey;

import corvus.corax.config.CorvusConfig;
import corvus.corax.inject.Inject;

/**
 * @author Vlad
 * This class is dependent on Asset Manager!
 */
public class DataMappingService {
	private static final MuLogger log = MuLogger.getLogger(DataMappingService.class);
	
	@Inject
	private AssetManager assetManager;

	private ObjectMapper jsonMapper = new ObjectMapper();
	private DefaultPrettyPrinter defaultPrettyPrinter;
	private TypeFactory defaultTypeFactory;
	
	@Inject
	private void load() {
		if(assetManager == null) {
			throw new RuntimeException("AssetManaget has not been set in your setup! Mapping service cannot be performed!");
		}
		
		defaultTypeFactory = TypeFactory.defaultInstance();

		jsonMapper.setVisibilityChecker(jsonMapper.getDeserializationConfig().getDefaultVisibilityChecker()
		        .withCreatorVisibility(JsonAutoDetect.Visibility.NONE)
		        .withFieldVisibility(JsonAutoDetect.Visibility.ANY)
		        .withGetterVisibility(JsonAutoDetect.Visibility.NONE)
		        .withIsGetterVisibility(JsonAutoDetect.Visibility.NONE)
		        .withSetterVisibility(JsonAutoDetect.Visibility.NONE));
		
		jsonMapper.configure(SerializationFeature.INDENT_OUTPUT, true).configure(Feature.ALLOW_COMMENTS, true);
		
		defaultPrettyPrinter = new DefaultPrettyPrinter();
		defaultPrettyPrinter.indentArraysWith(new Lf2SpacesIndenter());
	}

	public <T> ArrayList<T> asArrayList(Class<? extends T> type, String path) throws Exception {
		InputStream is = assetManager.loadAsset(FileKey.class, path);
		return asArrayList(is, type);
	}

	public <T> ArrayList<T> asArrayList(InputStream is, Class<? extends T> type) throws Exception {
		return jsonMapper.readValue(is, defaultTypeFactory.constructCollectionType(ArrayList.class, type));
	}
	
	public <T> T asSimple(Class<? extends T> type, String path) {
		InputStream is = assetManager.loadAsset(FileKey.class, path);
		try {
			return jsonMapper.readValue(is, type);
		}
		catch (Exception e) {
			log.fatal("Failed deserialization of "+type.getSimpleName()+"!", e);
		}
		
		return null;
	}

	public ObjectWriter writer() {
		return jsonMapper.writer(defaultPrettyPrinter);
	}

	/**
	 * @param obj
	 * @param path
	 */
	public void saveSimple(Object obj, String path) {
		try {
			writer().writeValue(new File(CorvusConfig.WorkingDirectory, path), obj);
		}
		catch (Exception e) {
			log.fatal("Failed saving object["+obj.getClass().getSimpleName()+"]!", e);
		}
	}
}