Class StandardTable<R,C,V>

java.lang.Object
com.google.common.collect.AbstractTable<R,C,V>
com.google.common.collect.StandardTable<R,C,V>
All Implemented Interfaces:
Table<R,C,V>, Serializable
Direct Known Subclasses:
HashBasedTable, StandardRowSortedTable

class StandardTable<R,C,V> extends AbstractTable<R,C,V> implements Serializable
Table implementation backed by a map that associates row keys with column key / value secondary maps. This class provides rapid access to records by the row key alone or by both keys, but not by just the column key.

The views returned by column(C), columnKeySet(), and columnMap() have iterators that don't support remove(). Otherwise, all optional operations are supported. Null row keys, columns keys, and values are not supported.

Lookups by row key are often faster than lookups by column key, because the data is stored in a Map<R, Map<C, V>>. A method call like column(columnKey).get(rowKey) still runs quickly, since the row key is provided. However, column(columnKey).size() takes longer, since an iteration across all row keys occurs.

Note that this implementation is not synchronized. If multiple threads access this table concurrently and one of the threads modifies the table, it must be synchronized externally.

  • Field Details

  • Constructor Details

  • Method Details

    • contains

      public boolean contains(@CheckForNull Object rowKey, @CheckForNull Object columnKey)
      Description copied from interface: Table
      Returns true if the table contains a mapping with the specified row and column keys.
      Specified by:
      contains in interface Table<R,C,V>
      Overrides:
      contains in class AbstractTable<R,C,V>
      Parameters:
      rowKey - key of row to search for
      columnKey - key of column to search for
    • containsColumn

      public boolean containsColumn(@CheckForNull Object columnKey)
      Description copied from interface: Table
      Returns true if the table contains a mapping with the specified column.
      Specified by:
      containsColumn in interface Table<R,C,V>
      Overrides:
      containsColumn in class AbstractTable<R,C,V>
      Parameters:
      columnKey - key of column to search for
    • containsRow

      public boolean containsRow(@CheckForNull Object rowKey)
      Description copied from interface: Table
      Returns true if the table contains a mapping with the specified row key.
      Specified by:
      containsRow in interface Table<R,C,V>
      Overrides:
      containsRow in class AbstractTable<R,C,V>
      Parameters:
      rowKey - key of row to search for
    • containsValue

      public boolean containsValue(@CheckForNull Object value)
      Description copied from interface: Table
      Returns true if the table contains a mapping with the specified value.
      Specified by:
      containsValue in interface Table<R,C,V>
      Overrides:
      containsValue in class AbstractTable<R,C,V>
      Parameters:
      value - value to search for
    • get

      @CheckForNull public V get(@CheckForNull Object rowKey, @CheckForNull Object columnKey)
      Description copied from interface: Table
      Returns the value corresponding to the given row and column keys, or null if no such mapping exists.
      Specified by:
      get in interface Table<R,C,V>
      Overrides:
      get in class AbstractTable<R,C,V>
      Parameters:
      rowKey - key of row to search for
      columnKey - key of column to search for
    • isEmpty

      public boolean isEmpty()
      Description copied from interface: Table
      Returns true if the table contains no mappings.
      Specified by:
      isEmpty in interface Table<R,C,V>
      Overrides:
      isEmpty in class AbstractTable<R,C,V>
    • size

      public int size()
      Description copied from interface: Table
      Returns the number of row key / column key / value mappings in the table.
      Specified by:
      size in interface Table<R,C,V>
    • clear

      public void clear()
      Description copied from interface: Table
      Removes all mappings from the table.
      Specified by:
      clear in interface Table<R,C,V>
      Overrides:
      clear in class AbstractTable<R,C,V>
    • getOrCreate

      private Map<C,V> getOrCreate(R rowKey)
    • put

      @CheckForNull public V put(R rowKey, C columnKey, V value)
      Description copied from interface: Table
      Associates the specified value with the specified keys. If the table already contained a mapping for those keys, the old value is replaced with the specified value.
      Specified by:
      put in interface Table<R,C,V>
      Overrides:
      put in class AbstractTable<R,C,V>
      Parameters:
      rowKey - row key that the value should be associated with
      columnKey - column key that the value should be associated with
      value - value to be associated with the specified keys
      Returns:
      the value previously associated with the keys, or null if no mapping existed for the keys
    • remove

      @CheckForNull public V remove(@CheckForNull Object rowKey, @CheckForNull Object columnKey)
      Description copied from interface: Table
      Removes the mapping, if any, associated with the given keys.
      Specified by:
      remove in interface Table<R,C,V>
      Overrides:
      remove in class AbstractTable<R,C,V>
      Parameters:
      rowKey - row key of mapping to be removed
      columnKey - column key of mapping to be removed
      Returns:
      the value previously associated with the keys, or null if no such value existed
    • removeColumn

      private Map<R,V> removeColumn(@CheckForNull Object column)
    • containsMapping

      private boolean containsMapping(@CheckForNull Object rowKey, @CheckForNull Object columnKey, @CheckForNull Object value)
    • removeMapping

      private boolean removeMapping(@CheckForNull Object rowKey, @CheckForNull Object columnKey, @CheckForNull Object value)
      Remove a row key / column key / value mapping, if present.
    • cellSet

      public Set<Table.Cell<R,C,V>> cellSet()
      Returns a set of all row key / column key / value triplets. Changes to the returned set will update the underlying table, and vice versa. The cell set does not support the add or addAll methods.

      The set's iterator traverses the mappings for the first row, the mappings for the second row, and so on.

      Each cell is an immutable snapshot of a row key / column key / value mapping, taken at the time the cell is returned by a method call to the set or its iterator.

      Specified by:
      cellSet in interface Table<R,C,V>
      Overrides:
      cellSet in class AbstractTable<R,C,V>
      Returns:
      set of table cells consisting of row key / column key / value triplets
    • cellIterator

      Iterator<Table.Cell<R,C,V>> cellIterator()
      Specified by:
      cellIterator in class AbstractTable<R,C,V>
    • cellSpliterator

      Spliterator<Table.Cell<R,C,V>> cellSpliterator()
      Specified by:
      cellSpliterator in class AbstractTable<R,C,V>
    • row

      public Map<C,V> row(R rowKey)
      Description copied from interface: Table
      Returns a view of all mappings that have the given row key. For each row key / column key / value mapping in the table with that row key, the returned map associates the column key with the value. If no mappings in the table have the provided row key, an empty map is returned.

      Changes to the returned map will update the underlying table, and vice versa.

      Specified by:
      row in interface Table<R,C,V>
      Parameters:
      rowKey - key of row to search for in the table
      Returns:
      the corresponding map from column keys to values
    • column

      public Map<R,V> column(C columnKey)
      Returns a view of all mappings that have the given column key. For each row key / column key / value mapping in the table with that column key, the returned map associates the row key with the value. If no mappings in the table have the provided column key, an empty map is returned.

      Changes to the returned map will update the underlying table, and vice versa.

      The returned map's views have iterators that don't support remove().

      Specified by:
      column in interface Table<R,C,V>
      Parameters:
      columnKey - key of column to search for in the table
      Returns:
      the corresponding map from row keys to values
    • rowKeySet

      public Set<R> rowKeySet()
      Description copied from interface: Table
      Returns a set of row keys that have one or more values in the table. Changes to the set will update the underlying table, and vice versa.
      Specified by:
      rowKeySet in interface Table<R,C,V>
      Overrides:
      rowKeySet in class AbstractTable<R,C,V>
      Returns:
      set of row keys
    • columnKeySet

      public Set<C> columnKeySet()
      Returns a set of column keys that have one or more values in the table. Changes to the set will update the underlying table, and vice versa.

      The returned set has an iterator that does not support remove().

      The set's iterator traverses the columns of the first row, the columns of the second row, etc., skipping any columns that have appeared previously.

      Specified by:
      columnKeySet in interface Table<R,C,V>
      Overrides:
      columnKeySet in class AbstractTable<R,C,V>
      Returns:
      set of column keys
    • createColumnKeyIterator

      Iterator<C> createColumnKeyIterator()
      Creates an iterator that returns each column value with duplicates omitted.
    • values

      public Collection<V> values()
      Returns a collection of all values, which may contain duplicates. Changes to the returned collection will update the underlying table, and vice versa.

      The collection's iterator traverses the values for the first row, the values for the second row, and so on.

      Specified by:
      values in interface Table<R,C,V>
      Overrides:
      values in class AbstractTable<R,C,V>
      Returns:
      collection of values
    • rowMap

      public Map<R,Map<C,V>> rowMap()
      Description copied from interface: Table
      Returns a view that associates each row key with the corresponding map from column keys to values. Changes to the returned map will update this table. The returned map does not support put() or putAll(), or setValue() on its entries.

      In contrast, the maps returned by rowMap().get() have the same behavior as those returned by Table.row(R). Those maps may support setValue(), put(), and putAll().

      Specified by:
      rowMap in interface Table<R,C,V>
      Returns:
      a map view from each row key to a secondary map from column keys to values
    • createRowMap

      Map<R,Map<C,V>> createRowMap()
    • columnMap

      public Map<C,Map<R,V>> columnMap()
      Description copied from interface: Table
      Returns a view that associates each column key with the corresponding map from row keys to values. Changes to the returned map will update this table. The returned map does not support put() or putAll(), or setValue() on its entries.

      In contrast, the maps returned by columnMap().get() have the same behavior as those returned by Table.column(C). Those maps may support setValue(), put(), and putAll().

      Specified by:
      columnMap in interface Table<R,C,V>
      Returns:
      a map view from each column key to a secondary map from row keys to values