Class: Cequel::Schema::TableReader

Inherits:
Object
  • Object
show all
Defined in:
lib/cequel/schema/table_reader.rb

Overview

A TableReader interprets table data from the cassandra driver into a table descriptor (read: `Table`).

Since:

  • 1.0.0

Constant Summary collapse

COMPOSITE_TYPE_PATTERN =

Since:

  • 1.0.0

/^org\.apache\.cassandra\.db\.marshal\.CompositeType\((.+)\)$/
REVERSED_TYPE_PATTERN =

Since:

  • 1.0.0

/^org\.apache\.cassandra\.db\.marshal\.ReversedType\((.+)\)$/
COLLECTION_TYPE_PATTERN =

Since:

  • 1.0.0

/^org\.apache\.cassandra\.db\.marshal\.(List|Set|Map)Type\((.+)\)$/

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(table_data) ⇒ TableReader

Returns a new instance of TableReader.

Parameters:

  • keyspace (Metal::Keyspace)

    keyspace to read the table from

  • table_name (Symbol)

    name of the table to read

Since:

  • 1.0.0


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# File 'lib/cequel/schema/table_reader.rb', line 53

def initialize(table_data)
  @table_data = table_data
  @table = Table.new(table_data.name,
                     Cassandra::MaterializedView === table_data)
end

Class Method Details

.read(keyspace, table_name) ⇒ Object

Read the schema defined in the database for a given table and return a Cequel::Schema::Table instance

Parameters:

  • keyspace (Metal::Keyspace)

    keyspace to read the table from

  • table_name (Symbol)

    name of the table to read

Since:

  • 1.0.0


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# File 'lib/cequel/schema/table_reader.rb', line 28

def read(keyspace, table_name)
  table_data = fetch_raw_keyspace(keyspace).table(table_name.to_s)
  (fail NoSuchTableError) if table_data.blank?

  new(table_data).call
end

Instance Method Details

#callTable

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Read table schema from the database

Returns:

  • (Table)

    object representation of table in the database, or `nil` if no table by given name exists

Since:

  • 1.0.0


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# File 'lib/cequel/schema/table_reader.rb', line 67

def call
  return nil if table_data.blank?

  read_partition_keys
  read_clustering_columns
  read_indexes
  read_data_columns
  read_properties
  read_table_settings

  table
end