Package org.jfree.data

Interface KeyedValues<K extends Comparable<K>>

Type Parameters:
K - the key type (String is a good default).
All Superinterfaces:
Values
All Known Subinterfaces:
KeyedValuesDataset, PieDataset<K>
All Known Implementing Classes:
CategoryToPieDataset, DefaultKeyedValues, DefaultKeyedValuesDataset, DefaultPieDataset, JDBCPieDataset
public interface KeyedValues<K extends Comparable<K>> extends Values
An ordered list of (key, value) items where the keys are unique and non-null.
See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    getIndex(K key)
    Returns the index for a given key.
    K
    getKey(int index)
    Returns the key associated with the item at a given position.
    List<K>
    getKeys()
    Returns the keys for the values in the collection.
    Number
    getValue(K key)
    Returns the value for a given key.

    Methods inherited from interface org.jfree.data.Values

    getItemCount, getValue

  • Method Details

    • getKey

      K getKey(int index)
      Returns the key associated with the item at a given position. Note that some implementations allow re-ordering of the data items, so the result may be transient.
      Parameters:
      index - the item index (in the range 0 to getItemCount() - 1).
      Returns:
      The key (never null).
      Throws:
      IndexOutOfBoundsException - if index is not in the specified range.

    • getIndex

      int getIndex(K key)
      Returns the index for a given key.
      Parameters:
      key - the key (null not permitted).
      Returns:
      The index, or -1 if the key is unrecognised.
      Throws:
      IllegalArgumentException - if key is null.

    • getKeys

      List<K> getKeys()
      Returns the keys for the values in the collection. Note that you can access the values in this collection by key or by index. For this reason, the key order is important - this method should return the keys in order. The returned list may be unmodifiable.
      Returns:
      The keys (never null).

    • getValue

      Number getValue(K key)
      Returns the value for a given key.
      Parameters:
      key - the key.
      Returns:
      The value (possibly null).
      Throws:
      UnknownKeyException - if the key is not recognised.