JacksonCatalogWriter.java

package net.vhati.modmanager.json;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;
import java.util.List;
import java.util.Map;

import net.vhati.modmanager.core.ModsInfo;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;


public class JacksonCatalogWriter {

	/**
	 * Writes collated catalog entries to a file, as condensed json.
	 */
	public static void write( List<ModsInfo> modsInfoList, File dstFile ) throws IOException {
		ObjectMapper mapper = new ObjectMapper();
		ObjectNode rootNode = mapper.createObjectNode();

		ObjectNode catalogsNode = rootNode.objectNode();
		rootNode.put( "catalog_versions", catalogsNode );

		ArrayNode catalogNode = rootNode.arrayNode();
		catalogsNode.put( "1", catalogNode );

		for ( ModsInfo modsInfo : modsInfoList ) {
			ObjectNode infoNode = rootNode.objectNode();
			catalogNode.add( infoNode );

			infoNode.put( "title", modsInfo.getTitle() );
			infoNode.put( "author", modsInfo.getAuthor() );
			infoNode.put( "desc", modsInfo.getDescription() );
			infoNode.put( "url", modsInfo.getThreadURL() );

			infoNode.put( "thread_hash", modsInfo.threadHash );

			ArrayNode versionsNode = rootNode.arrayNode();
			infoNode.put( "versions", versionsNode );

			for ( Map.Entry<String,String> entry : modsInfo.getVersionsMap().entrySet() ) {
				String versionFileHash = entry.getKey();
				String versionString = entry.getValue();

				ObjectNode versionNode = rootNode.objectNode();
				versionNode.put( "hash", versionFileHash );
				versionNode.put( "version", versionString );
				versionsNode.add( versionNode );
			}
		}

		OutputStream os = null;
		try {
			os = new FileOutputStream( dstFile );
			OutputStreamWriter writer = new OutputStreamWriter( os, Charset.forName("US-ASCII") );
			mapper.writeValue( writer, rootNode );
		}
		finally {
			try {if ( os != null ) os.close();}
			catch ( IOException e ) {}
		}
	}
}