org.apache.commons.collections4.iterators

Class EntrySetMapIterator<K,V>

java.lang.Object

org.apache.commons.collections4.iterators.EntrySetMapIterator<K,V>

All Implemented Interfaces:

Iterator<K>, MapIterator<K,V>, ResettableIterator<K>

public class EntrySetMapIterator<K,V>
extends Object
implements MapIterator<K,V>, ResettableIterator<K>

Implements a MapIterator using a Map entrySet. Reverse iteration is not supported.

 MapIterator it = map.mapIterator();
 while (it.hasNext()) {
   Object key = it.next();
   Object value = it.getValue();
   it.setValue(newValue);
 }
 

Since:

3.0

Constructor Summary

Constructors

Constructor and Description
EntrySetMapIterator(Map<K,V> map) Constructor.

Method Summary

Modifier and Type	Method and 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.
K	next() Gets the next key from the Map.
void	remove() Removes the last returned key from the underlying Map.
void	reset() Resets the state of the iterator.
V	setValue(V value) Sets the value associated with the current key.
String	toString() Gets the iterator as a String.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Detail

EntrySetMapIterator

public EntrySetMapIterator(Map<K,V> map)

Constructor.

Parameters:

map - the map to iterate over

Method Detail

hasNext

public boolean hasNext()

Checks to see if there are more entries still to be iterated.

Specified by:

hasNext in interface Iterator<K>

Specified by:

hasNext in interface MapIterator<K,V>

Returns:

true if the iterator has more elements

next

public K next()

Gets the next key from the Map.

Specified by:

next in interface Iterator<K>

Specified by:

next in interface MapIterator<K,V>

Returns:

the next key in the iteration

Throws:

NoSuchElementException - if the iteration is finished

remove

public void remove()

Removes the last returned key from the underlying Map.

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

Specified by:

remove in interface Iterator<K>

Specified by:

remove in interface MapIterator<K,V>

Throws:

UnsupportedOperationException - if remove is not supported by the map

IllegalStateException - if next() has not yet been called

IllegalStateException - if remove() has already been called since the last call to next()

getKey

public K getKey()

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

Throws:

IllegalStateException - if next() has not yet been called

getValue

public V getValue()

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

Throws:

IllegalStateException - if next() has not yet been called

setValue

public V setValue(V value)

Sets the value associated with the current key.

Specified by:

setValue in interface MapIterator<K,V>

Parameters:

value - the new value

Returns:

the previous value

Throws:

UnsupportedOperationException - if setValue is not supported by the map

IllegalStateException - if next() has not yet been called

IllegalStateException - if remove() has been called since the last call to next()

reset

public void reset()

Resets the state of the iterator.

Specified by:

reset in interface ResettableIterator<K>

toString

public String toString()

Gets the iterator as a String.

Overrides:

toString in class Object

Returns:

a string version of the iterator