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/**
 * ExecutesInterface providing the HBase DDL operations.
 */
@Beta
public interface HBaseDDLExecutor extends Closeable {
  /**
   * Initialize the {@link HBaseDDLExecutor}.
   * @param context the context for the executor
   */
  void initialize(HBaseDDLExecutorContext context);

  /**
   * Create the specified namespace if it does not exist.
   *
   * @param name the namespace to create
   * @return whether the namespace was created
   * @throws IOException if a remote or network exception occurs
   */
  voidboolean createNamespaceIfNotExists(String name) throws IOException;

  /**
   * Delete the specified namespace if it exists.
   *
   * @param name the namespace to delete
   * @throws IOException if a remote or network exception occurs
   * @throws IllegalStateException if there are tables in the namespace
   */
  void deleteNamespaceIfExists(String name) throws IOException;

  /**
   * Create the specified table if it does not exist.
   *
   * @param descriptor the descriptor for the table to create
   * @param splitKeys the initial split keys for the table
   * @throws IOException if a remote or network exception occurs
   * @throws NotFoundException if the namespace for the specified table does not exist
   */
  void createTableIfNotExists(TableDescriptor descriptor, @Nullable byte[][] splitKeys)
    throws IOException;

  /**
   * Enable the specified table if it is disabled.
   *
   * @param namespace the namespace of the table to enable
   * @param name the name of the table to enable
   * @throws IOException if a remote or network exception occurs
   * @throws NotFoundException if the
specified table does not exist
   */
  void enableTableenableTableIfDisabled(String namespace, String name) throws IOException;

  /**
   * Disable the specified table if it is enabled.
   *
   * @param namespace the namespace of the table to disable
   * @param name the name of the table to disable
   * @throws IOException if a remote or network exception occurs
   * @throws NotFoundException if the specified table does not exist
   */
  void disableTabledisableTableIfEnabled(String namespace, String name) throws IOException;

  /**
   * Modify the specified table. The table must be disabled.
   *
   * @param namespace the namespace of the table to modify
   * @param name the name of the table to modify
   * @param descriptor the descriptor for the table
   * @throws IOException if a remote or network exception occurs
   * @throws NotFoundException if the specified table does not exist
   * @throws IllegalStateException if the specified table is not disabled
   */
  void modifyTable(String namespace, String name, TableDescriptor descriptor) throws IOException;
 
  /**
   * Truncate the specified table. The table must be disabled.
   *  
    * @param namespace the namespace of the table to truncate
   * @param name the name of the table to truncate
   * @throws IOException if a remote or network exception occurs
   * @throws NotFoundException if the specified table does
not exist    * @throws IllegalStateException if the specified table is not disabled
   */
  void truncateTable(String namespace, String name) throws IOException;

  /**
   * Delete the table if it exists. The table must be disabled.
   *
   * @param namespace the namespace of the table to delete
   * @param name the table to delete
   * @throws IOException if a remote or network exception occurs
   * @throws NotFoundException if IllegalStateException if the specified table is not disabled
   */
  void deleteTableIfExists(String namespace, String name) throws IOException;

  /**
   * Grant permissions on a table or namespace to users or groups.
   *
   * @param namespace the namespace forof the specified table does not exist
   * @throws IllegalStateException if the specified table is not disabledtable
   * @param table the name of the. If null, then the permissions are applied to the namespace
   * @param permissions A map from user or group name to the permissions for that user or group, given as a string
   *                    containing only characters 'a'(Admin), 'c'(Create), 'r'(Read), 'w'(Write), and 'x'(Execute).
   *                    Group names must be prefixed with the character '@'.
   * @throws IOException if anything goes wrong
   */
  void deleteTableIfExistsgrantPermissions(String namespace, @Nullable String nametable, Map<String, String> permissions) throws IOException;
}

 
/**
 * Describes an HBase Table.
 */
public class TableDescriptor {
  private final String namespace;
  private final String name;
  private final Map<String, ColumnFamilyDescriptor> families; // family -> descriptor
  private final Collection<CoprocessorDescriptor>Map<String, CoprocessorDescriptor> coprocessors; // classname -> descriptor
  private final Map<String, String> properties;
}
 
/**
 * Describes an HBase table CoProcessorcoprocessor.
 */
public class CoprocessorDescriptor {
  private final String classnamedirPath;
  private final Stringint pathpriority;
  private final Map<String, intString> priorityproperties;
 
  private final Map<String, String> properties;public String getCoprocessorPath(String cdapVersion, String hbaseVersion) {
    ...
  }
}

/**
 * Describes an HBase table column family.
 */
public class ColumnFamilyDescriptor {
  private final int maxVersions;
  private final CompressionType compressionType;
  private final BloomType bloomType;
  private final Map<String, String> properties;
}

/**
 * Types of column family compression.
 */
public enum CompressionType {
  LZO, SNAPPY, GZIP, NONE
}
 
/**
 * Types of column family bloom filters.
 */
public enum BloomType {
  ROW, ROWCOL, NONE
}