Package oracle.dbtools.plugin.api.collections

Interface MultiMap<K,​V>

  • Type Parameters:
    K - the type of keys maintained by this multimap
    V - the type of mapped values
    public interface MultiMap<K,​V>
    A MultiMap is like a Map except that a key can be bound to multiple values. It is similar to Map<K,Collection<V>>, but not identical because in a multimap, each key and value is stored as an individual entry. This means that the iteration order and size() will be different. If you actually need the Map<K,Collection<V>> semantics, then call the map() method.
    Author:
    cdivilly
    See Also:
    size()

    • Method Summary

      All Methods Instance Methods Abstract Methods Default Methods 
      Modifier and Type Method Description
      default boolean containsKey​(java.lang.Object key)
      Test if this object contains the specified key.
      java.util.Collection<java.util.Map.Entry<K,​V>> entries()
      Get each key value pair in this multi-map.
      default V get​(java.lang.Object key)
      Get the first value associated with the specified key.
      default boolean isEmpty()
      Returns true if this MultiMap contains no key-value mappings.
      default java.util.Set<K> keySet()
      The set of keys in this object
      java.util.Map<K,​java.util.Collection<V>> map()
      Represent this MultiMap as a Map<K,Collection<V>> data structure, where values are grouped by key.
      default int size()
      The number of entries in this MultiMap.
      java.util.Collection<V> values​(java.lang.Object key)
      Get all the values associated with the specified key.

    • Method Detail

      • containsKey

        default boolean containsKey​(java.lang.Object key)
        Test if this object contains the specified key.
        Parameters:
        key - The key to search for
        Returns:
        true if the key exists, false otherwise

      • entries

        java.util.Collection<java.util.Map.Entry<K,​V>> entries()
        Get each key value pair in this multi-map.
        Returns:
        Collection of all Map.Entrys in this multi map.

      • get

        default V get​(java.lang.Object key)
        Get the first value associated with the specified key.
        Parameters:
        key - The key to search for
        Returns:
        The first value associated with the key, or null if no values are associated with the key

      • isEmpty

        default boolean isEmpty()
        Returns true if this MultiMap contains no key-value mappings.
        Returns:
        true if this MultiMap contains no key-value mappings

      • keySet

        default java.util.Set<K> keySet()
        The set of keys in this object
        Returns:
        The key set

      • map

        java.util.Map<K,​java.util.Collection<V>> map()
        Represent this MultiMap as a Map<K,Collection<V>> data structure, where values are grouped by key.
        Returns:
        Map instance

      • size

        default int size()
        The number of entries in this MultiMap. Note that this method returns the number of entries, not the number of keys as a Map would. Consider the following MultiMap 
         { a = b, c = d, a = e }
        The size() of this MultiMap is 3. Note that the Map.size() value returned by the Map instance returned from the map() method would be 2, because there are only two distinct keys.
        Returns:
        the number of values in the multimap

      • values

        java.util.Collection<V> values​(java.lang.Object key)
        Get all the values associated with the specified key.
        Parameters:
        key - The name of the key
        Returns:
        The values associated with the key, or returns null if the key is not present in the MultiMap