| java.lang.Object
 com.hp.hpl.jena.util.iterator.NiceIterator
All known Subclasses: com.hp.hpl.jena.util.iterator.MapFilterIterator, com.hp.hpl.jena.util.iterator.SingletonIterator, com.hp.hpl.jena.util.iterator.WrappedIterator, com.hp.hpl.jena.util.iterator.NullIterator, com.hp.hpl.jena.mem.ObjectIterator, com.hp.hpl.jena.graph.impl.FragmentTripleIterator,
| NiceIterator | | public class NiceIterator implements ExtendedIterator(Code) | | NiceIterator is the standard base class implementing ExtendedIterator. It provides
the static methods for andThen, filterKeep and
filterDrop; these can be reused from any other class. It defines
equivalent instance methods for descendants and to satisfy ExtendedIterator.
author:
kers |
| Method Summary | |
| public static ExtendedIterator | andThen(Iterator a, Iterator b)
concatenate two closable iterators. | | public ExtendedIterator | andThen(ClosableIterator other)
make a new iterator, which is us then the other chap. | | public static List | asList(ExtendedIterator it)
Answer a list of the elements from it, in order, consuming
that iterator. | | public static Set | asSet(ExtendedIterator it)
Answer a list of the elements of it in order, consuming this iterator. | | public void | close()
default close: don't need to do anything. | | public static void | close(Iterator it)
If it is a Closableiterator, close it. | | public static ExtendedIterator | emptyIterator()
An iterator over no elements. | | protected void | ensureHasNext()
| | public ExtendedIterator | filterDrop(Filter f)
| | public ExtendedIterator | filterKeep(Filter f)
| | public boolean | hasNext()
default hasNext: no elements, return false. | | public ExtendedIterator | mapWith(Map1 map1)
make a new iterator which is the elementwise _map1_ of the base iterator. | | public Object | next()
default next: throw an exception. | | protected Object | noElements(String message)
Utility method for this and other (sub)classes: raise the appropriate
"no more elements" exception. | | public void | remove()
default remove: we have no elements, so we can't remove any. | | public Object | removeNext()
Answer the next object, and remove it. | | public List | toList()
Answer a list of the elements in order, consuming this iterator. | | public Set | toSet()
Answer a list of the elements in order, consuming this iterator. |
| NiceIterator | | public NiceIterator()(Code) | | |
| asList | | public static List asList(ExtendedIterator it)(Code) | | Answer a list of the elements from it, in order, consuming
that iterator. Canonical implementation of toList().
|
| asSet | | public static Set asSet(ExtendedIterator it)(Code) | | Answer a list of the elements of it in order, consuming this iterator.
Canonical implementation of toSet().
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| close | | public void close()(Code) | | default close: don't need to do anything.
|
| close | | public static void close(Iterator it)(Code) | | If it is a Closableiterator, close it. Abstracts away from
tests [that were] scattered through the code.
|
| emptyIterator | | public static ExtendedIterator emptyIterator()(Code) | | An iterator over no elements.
A class singleton which doesn't iterate. |
| ensureHasNext | | protected void ensureHasNext()(Code) | | |
| hasNext | | public boolean hasNext()(Code) | | default hasNext: no elements, return false.
|
| next | | public Object next()(Code) | | default next: throw an exception.
|
| noElements | | protected Object noElements(String message)(Code) | | Utility method for this and other (sub)classes: raise the appropriate
"no more elements" exception. I note that we raised the wrong exception
in at least one case ...
Parameters:
message - the string to include in the exception never - but we have a return type to please the compiler |
| remove | | public void remove()(Code) | | default remove: we have no elements, so we can't remove any.
|
| removeNext | | public Object removeNext()(Code) | | Answer the next object, and remove it.
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| toList | | public List toList()(Code) | | Answer a list of the elements in order, consuming this iterator.
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| toSet | | public Set toSet()(Code) | | Answer a list of the elements in order, consuming this iterator.
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