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java.lang.Object | +--org.apache.commons.collections.iterators.ProxyIterator | +--org.apache.commons.collections.iterators.FilterIterator
A Proxy Iterator
which takes a Predicate
instance to filter
out objects from an underlying Iterator
instance.
Only objects for which the
specified Predicate
evaluates to true
are
returned.
Constructor Summary | |
FilterIterator()
Constructs a new FilterIterator that will not function
until setIterator is invoked. |
|
FilterIterator(java.util.Iterator iterator)
Constructs a new FilterIterator that will not function
until setPredicate is invoked. |
|
FilterIterator(java.util.Iterator iterator,
Predicate predicate)
Constructs a new FilterIterator that will use the
given iterator and predicate. |
Method Summary | |
Predicate |
getPredicate()
Getter for property predicate. |
boolean |
hasNext()
Returns true if the underlying iterator contains an object that matches the predicate. |
java.lang.Object |
next()
Returns the next object that matches the predicate. |
void |
remove()
Always throws UnsupportedOperationException as this class does look-ahead with its internal iterator. |
void |
setPredicate(Predicate predicate)
Setter for property predicate. |
Methods inherited from class org.apache.commons.collections.iterators.ProxyIterator |
getIterator, setIterator |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public FilterIterator()
FilterIterator
that will not function
until setIterator
is invoked.
public FilterIterator(java.util.Iterator iterator)
FilterIterator
that will not function
until setPredicate
is invoked.
iterator
- the iterator to usepublic FilterIterator(java.util.Iterator iterator, Predicate predicate)
FilterIterator
that will use the
given iterator and predicate.
iterator
- the iterator to usepredicate
- the predicate to useMethod Detail |
public boolean hasNext()
hasNext
in interface java.util.Iterator
hasNext
in class ProxyIterator
public java.lang.Object next()
next
in interface java.util.Iterator
next
in class ProxyIterator
java.util.NoSuchElementException
- if there are no more elements that
match the predicatepublic void remove()
remove
in interface java.util.Iterator
remove
in class ProxyIterator
java.lang.UnsupportedOperationException
- alwayspublic Predicate getPredicate()
public void setPredicate(Predicate predicate)
predicate
- New value of property predicate.
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