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java.lang.Objectorg.apache.commons.betwixt.expression.IteratorExpression.EnumerationIterator
private static final class IteratorExpression.EnumerationIterator
Adapter to make Enumeration
instances appear to be
Iterator
instances. Originated in commons-collections.
Added as a private inner class to break dependency.
Field Summary | |
---|---|
private java.util.Collection |
collection
The collection to remove elements from |
private java.util.Enumeration |
enumeration
The enumeration being converted |
private java.lang.Object |
last
The last object retrieved |
Constructor Summary | |
---|---|
IteratorExpression.EnumerationIterator()
Constructs a new EnumerationIterator that will not
function until setEnumeration(Enumeration) is called. |
|
IteratorExpression.EnumerationIterator(java.util.Enumeration enumeration)
Constructs a new EnumerationIterator that provides
an iterator view of the given enumeration. |
|
IteratorExpression.EnumerationIterator(java.util.Enumeration enumeration,
java.util.Collection collection)
Constructs a new EnumerationIterator that will remove
elements from the specified collection. |
Method Summary | |
---|---|
java.util.Enumeration |
getEnumeration()
Returns the underlying enumeration. |
boolean |
hasNext()
Returns true if the underlying enumeration has more elements. |
java.lang.Object |
next()
Returns the next object from the enumeration. |
void |
remove()
Removes the last retrieved element if a collection is attached. |
void |
setEnumeration(java.util.Enumeration enumeration)
Sets the underlying enumeration. |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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private java.util.Collection collection
private java.util.Enumeration enumeration
private java.lang.Object last
Constructor Detail |
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public IteratorExpression.EnumerationIterator()
EnumerationIterator
that will not
function until setEnumeration(Enumeration)
is called.
public IteratorExpression.EnumerationIterator(java.util.Enumeration enumeration)
EnumerationIterator
that provides
an iterator view of the given enumeration.
enumeration
- the enumeration to usepublic IteratorExpression.EnumerationIterator(java.util.Enumeration enumeration, java.util.Collection collection)
EnumerationIterator
that will remove
elements from the specified collection.
enumeration
- the enumeration to usecollection
- the collection to remove elements formMethod Detail |
---|
public boolean hasNext()
hasNext
in interface java.util.Iterator
java.lang.NullPointerException
- if the underlying enumeration is nullpublic java.lang.Object next()
next
in interface java.util.Iterator
java.lang.NullPointerException
- if the enumeration is nullpublic void remove()
Functions if an associated Collection
is known.
If so, the first occurrence of the last returned object from this
iterator will be removed from the collection.
remove
in interface java.util.Iterator
java.lang.IllegalStateException
- next()
not called.
java.lang.UnsupportedOperationException
- if no associated collectionpublic java.util.Enumeration getEnumeration()
public void setEnumeration(java.util.Enumeration enumeration)
enumeration
- the new underlying enumeration
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