Page History

public class Tag {
	/** Used for identify a tag. */
	private final long id;

	/** Name of the tag. */
	private final String name;

	/** Creation time. */
	private final long creationTimeMills;

	/** Used to identify which snapshot does this tag mark. */
    private final long taggedSnapshotId;

   	/** Id of the current table schema of the records in this tag. */
	private final long schemaId;

	/** The manifest list of all data of this tag. */
	private final long fullManifestList;

	/** How many records in this tag. */
	private final long recordCount;

	/** Getters. */
	
	/** Some util methods. */

	/** Return all {@link ManifestFileMeta} instances for full data manifests in this tag. */
 	public List<ManifestFileMeta> dataManifests(ManifestList manifestList);
	
	/** Serialize to json. */
	public String toJson();

	/** Deserialize from json. */
	public static Tag fromJson(String json);

	/** Get a tag from path. */
	public static Tag fromPath(FileIO fileIO, Path path);
}

public class TagManager {
	/** Return the root Directory of tags. */
	public Path tagDirectory(); 
 	
	/** Return the path of a tag. */
	public Path tagPath(long tagId);

 	/** Return the tag id by name. */
	public @Nullable Long findIdByName(String tagName);	 

 	/** Get a tag instance by id. */
	public Tag tag(long tagId);

 	/** Check if a tag exists. */
	public boolean tagExists(long tagId);
 	
	/** Return id of the earliest tag. */
 	public @Nullable Long earliestTagId();

 	/** Return id of the latest tag. */
    public @Nullable Long latestTagId();
}