package it.cavallium.strangedb.database;

import it.cavallium.strangedb.database.references.ReferenceInfo;

import java.io.IOException;

public interface IReferencesMetadata {
	/**
	 * Get block of reference
	 * @param reference reference
	 * @return block id
	 */
	long getReferenceBlockId(long reference) throws IOException;

	/**
	 * Get reference info
	 * @param reference reference
	 * @return reference info
	 */
	ReferenceInfo getCleanReference(long reference) throws IOException;

	/**
	 * Allocate a block for a new reference
	 *
	 * @param blockId block id
	 * @return reference
	 */
	long newReference(long blockId) throws IOException;

	/**
	 * Change reference
	 * @param reference reference
	 * @param cleanerId cleaner id
	 * @param blockId block id
	 */
	void editReference(long reference, byte cleanerId, long blockId) throws IOException;

	/**
	 * Delete reference
	 * @param reference reference
	 */
	void deleteReference(long reference) throws IOException;

	/**
	 * Close file
	 */
	void close() throws IOException;

	long getFirstFreeReference();
}