Package org.apache.openjpa.lib.util.collections

Class UnmodifiableOrderedMapIterator<K,​V>

  • Type Parameters:
    K - the type of keys
    V - the type of mapped values
    All Implemented Interfaces:
    java.util.Iterator<K>, MapIterator<K,​V>, OrderedIterator<K>, OrderedMapIterator<K,​V>, Unmodifiable
    public final class UnmodifiableOrderedMapIterator<K,​V>
extends java.lang.Object
implements OrderedMapIterator<K,​V>, Unmodifiable
    Decorates an ordered map iterator such that it cannot be modified.

    Attempts to modify it will result in an UnsupportedOperationException.

    Since:
    3.0

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      K getKey()
      Gets the current key, which is the key returned by the last call to next().
      V getValue()
      Gets the current value, which is the value associated with the last key returned by next().
      boolean hasNext()
      Checks to see if there are more entries still to be iterated.
      boolean hasPrevious()
      Checks to see if there is a previous entry that can be iterated to.
      K next()
      Gets the next key from the Map.
      K previous()
      Gets the previous key from the Map.
      void remove()
      Removes the last returned key from the underlying Map (optional operation).
      V setValue​(V value)
      Sets the value associated with the current key (optional operation).
      static <K,​V>
      OrderedMapIterator<K,​V>      		 unmodifiableOrderedMapIterator​(OrderedMapIterator<K,​? extends V> iterator)
      Decorates the specified iterator such that it cannot be modified.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

      • Methods inherited from interface java.util.Iterator

        forEachRemaining

    • Method Detail

      • unmodifiableOrderedMapIterator

        public static <K,​V> OrderedMapIterator<K,​V> unmodifiableOrderedMapIterator​(OrderedMapIterator<K,​? extends V> iterator)
        Decorates the specified iterator such that it cannot be modified.
        Type Parameters:
        K - the key type
        V - the value type
        Parameters:
        iterator - the iterator to decorate
        Returns:
        a new unmodifiable ordered map iterator
        Throws:
        java.lang.NullPointerException - if the iterator is null

      • hasNext

        public boolean hasNext()
        Description copied from interface: MapIterator
        Checks to see if there are more entries still to be iterated.
        Specified by:
        hasNext in interface java.util.Iterator<K>
        Specified by:
        hasNext in interface MapIterator<K,​V>
        Returns:
        true if the iterator has more elements

      • next

        public K next()
        Description copied from interface: MapIterator
        Gets the next key from the Map.
        Specified by:
        next in interface java.util.Iterator<K>
        Specified by:
        next in interface MapIterator<K,​V>
        Returns:
        the next key in the iteration

      • getKey

        public K getKey()
        Description copied from interface: MapIterator
        Gets the current key, which is the key returned by the last call to next().
        Specified by:
        getKey in interface MapIterator<K,​V>
        Returns:
        the current key

      • getValue

        public V getValue()
        Description copied from interface: MapIterator
        Gets the current value, which is the value associated with the last key returned by next().
        Specified by:
        getValue in interface MapIterator<K,​V>
        Returns:
        the current value

      • setValue

        public V setValue​(V value)
        Description copied from interface: MapIterator
        Sets the value associated with the current key (optional operation).
        Specified by:
        setValue in interface MapIterator<K,​V>
        Parameters:
        value - the new value
        Returns:
        the previous value

      • remove

        public void remove()
        Description copied from interface: MapIterator
        Removes the last returned key from the underlying Map (optional operation).

        This method can be called once per call to next().

        Specified by:
        remove in interface java.util.Iterator<K>
        Specified by:
        remove in interface MapIterator<K,​V>