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package org.lumongo.storage.constants;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;

import com.mongodb.gridfs.GridFSDBFile;

public interface MongoConstants {
	public static interface StandardDBs {
		public static final String ADMIN = "admin";
	}
	
	public static interface StandardFields {
		public static final String _ID = "_id";
	}
	
	public static interface Operators {
		public static final String LT = "$lt";
		public static final String GT = "$gt";
		public static final String AND = "$and";
		public static final String OR = "$or";
		public static final String NOR = "$nor";
		public static final String NOT = "$not";
		public static final String SET = "$set";
		public static final String INC = "$inc";
		public static final String UNSET = "$unset";
		public static final String ADD_SET = "$addToSet";
		public static final String EACH = "$each";
		public static final String EXISTS = "$exists";
		public static final String SEARCH_HIT = "$";
	}
	
	public static interface Commands {
		public static final String ENABLE_SHARDING = "enablesharding";
		public static final String SHARD_COLLECTION = "shardcollection";
		public static final String SHARD_KEY = "key";
	}
	
	public static class Functions {
		public static int BUFFER_SIZE = 1024;
		
		public static String createNameSpace(String databaseName, String collectionName) {
			return databaseName + "." + collectionName;
		}
		
		public static byte[] readFileFromGridFS(GridFSDBFile file) {
			InputStream is = file.getInputStream();
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			try {
				
				byte bytes[] = new byte[BUFFER_SIZE];
				int read = -1;
				
				while ((read = is.read(bytes)) != -1) {
					baos.write(bytes, 0, read);
				}
				
				return baos.toByteArray();
			}
			catch (Exception e) {
			}
			return null;
		}
	}
}