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java.lang.ObjectclassUtils.pack.util.ListMapIterator
public class ListMapIterator
An iterator to go thru a Map of Lists, using a specific key list for deciding how to access the sublists.
Given a java.util.Map
binding each key Ki to a
java.util.List
Li, this Iterator allows to
browse the set { L1, L2, ... , Ln} , by
specifying the order in which the lists should be picked.
Such order is specified by providing a key list affineTransform construction time; if no list
is given, the order of iteration is the arbitrary order in which the keys are
stored in the java.util.Map
, as given by the iterator
provided by the iterator()
method of the
java.util.Map
's key set.
For example, if a Map is built by
list1.add("Elem 1.1"); list1.add("Elem 1.2"); list2.add("Elem 2.1"); list3.add("Elem 3.1"); list3.add("Elem 3.2"); list3.add("Elem 3.3"); map.add("1", list1); map.add("2", list2); map.add("3", list3);a
ListMapIterator
built by
ListMapIterator i = new ListMapIterator(map, new Arrays.asList(new String[] { "1", "2", "3")));will produce the iteration
Elem1.1, Elem1.2, Elem2.1, Elem3.1, Elem3.2, Elem3.3
.
Constructor Summary | |
---|---|
ListMapIterator(java.util.Map map)
Create a ListMapIterator which uses default ordering (as provided by the set of keys in the map). |
|
ListMapIterator(java.util.Map map,
java.util.List keyorder)
Create a ListMapIterator which uses the key ordering defined in the given list. |
|
ListMapIterator(java.util.Map map,
java.util.List keyorder,
boolean failOnUnknownKeys,
boolean requireUniqueKeys)
Create a ListMapIterator which uses the key ordering defined in the given list. |
Method Summary | |
---|---|
java.lang.Object |
getCurrentKey()
|
boolean |
hasNext()
|
static void |
main(java.lang.String[] args)
|
java.lang.Object |
next()
|
void |
remove()
|
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ListMapIterator(java.util.Map map)
map
- the map of Lists to iteratepublic ListMapIterator(java.util.Map map, java.util.List keyorder)
map
- the map of Lists to iterate.keyorder
- the order with which the map Lists must be iterated.public ListMapIterator(java.util.Map map, java.util.List keyorder, boolean failOnUnknownKeys, boolean requireUniqueKeys)
map
- the map of Lists to iterate.keyorder
- the order with which the map Lists must be iterated.failOnUnknownKeys
- if true, the iterator will fail with
an IllegalArgumentException if one key in the
ordering list is not defined in the map.
Else, it will ignore the unknown key.requireUniqueKeys
- if true, the iterator will fail with
an IllegalArgumentException if the keys in the
ordering list are not unique.Method Detail |
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public boolean hasNext()
hasNext
in interface java.util.Iterator
Iterator.hasNext()
public java.lang.Object next()
next
in interface java.util.Iterator
Iterator.next()
public void remove()
remove
in interface java.util.Iterator
Iterator.remove()
public static void main(java.lang.String[] args) throws java.lang.Exception
java.lang.Exception
public java.lang.Object getCurrentKey()
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