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com.tangosol.util
Class ChainedEnumerator

java.lang.Object
com.tangosol.util.Base
com.tangosol.util.ChainedEnumerator

All Implemented Interfaces:

Enumeration, Iterator

public class ChainedEnumerator

extends Base

implements Enumeration, Iterator

Provide an enumerator which enumerates the contents of multiple enumerators.

Author:

cp 1998.08.07

Field Summary

protected int	m_iNextIter The next Iterator (index into the m_listIter) to iterate.
protected Iterator	m_iterCurrent The current Iterator.
protected List	m_listIter The Iterators.

Constructor Summary

ChainedEnumerator()
Construct an enumerator that will first enumerate multiple enumerators.

ChainedEnumerator(Enumeration enmrFirst)
Construct an enumerator that will first enumerate the passed Enumeration.

ChainedEnumerator(Enumeration[] aEnum)
Construct an enumerator that will first enumerate the Enumerations passed in the array as if they were together a single enumerator.

ChainedEnumerator(Enumeration enmrFirst, Enumeration enmrSecond)
Construct an enumerator that will first enumerate the first Enumeration and then will enumerate the second Enumeration as if they were together a single Enumeration.

ChainedEnumerator(Iterator iterator)
Construct an enumerator that will first enumerate the passed Iterator.

ChainedEnumerator(Iterator[] aIterator)
Construct an enumerator that will first enumerate the Iterators passed in the array as if they were together a single enumerator.

ChainedEnumerator(Iterator iterFirst, Iterator iterSecond)
Construct an enumerator that will first enumerate the first Iterator and then will enumerate the second Iterator as if they were together a single Iterator.

Method Summary

void	addEnumeration(Enumeration enmr) Add the Enumeration to the end of the chain.
void	addIterator(Iterator iterator) Add the Iterator to the end of the chain.
protected Iterator	getIterator() Get the current or next enumeration in the list
protected Iterator	getRecentIterator() Get the recently used iterator, if any.
boolean	hasMoreElements() Tests if this enumeration contains more elements.
boolean	hasNext() Tests if this Iterator contains more elements.
Object	next() Returns the next element of this Iterator.
Object	nextElement() Returns the next element of this enumeration.
void	remove() Remove the last-returned element that was returned by the Iterator.

Field Detail

m_listIter

protected List m_listIter

The Iterators.

m_iNextIter

protected int m_iNextIter

The next Iterator (index into the m_listIter) to iterate.

m_iterCurrent

protected Iterator m_iterCurrent

The current Iterator.

Constructor Detail

ChainedEnumerator

public ChainedEnumerator()

Construct an enumerator that will first enumerate multiple enumerators.

ChainedEnumerator

public ChainedEnumerator(Enumeration enmrFirst)

Construct an enumerator that will first enumerate the passed Enumeration.

Parameters:

enmrFirst - the first Enumeration

ChainedEnumerator

public ChainedEnumerator(Iterator iterator)

Construct an enumerator that will first enumerate the passed Iterator.

Parameters:

iterator - the first Iterator

ChainedEnumerator

public ChainedEnumerator(Enumeration enmrFirst,
                         Enumeration enmrSecond)

Construct an enumerator that will first enumerate the first Enumeration and then will enumerate the second Enumeration as if they were together a single Enumeration.

Parameters:

enmrFirst - the first Enumeration

enmrSecond - the second Enumeration

ChainedEnumerator

public ChainedEnumerator(Iterator iterFirst,
                         Iterator iterSecond)

Construct an enumerator that will first enumerate the first Iterator and then will enumerate the second Iterator as if they were together a single Iterator.

Parameters:

iterFirst - the first Iterator

iterSecond - the second Iterator

ChainedEnumerator

public ChainedEnumerator(Enumeration[] aEnum)

Construct an enumerator that will first enumerate the Enumerations passed in the array as if they were together a single enumerator.

Parameters:

aEnum - an array of Enumerations

ChainedEnumerator

public ChainedEnumerator(Iterator[] aIterator)

Construct an enumerator that will first enumerate the Iterators passed in the array as if they were together a single enumerator.

Parameters:

aIterator - an array of Iterators

Method Detail

addEnumeration

public void addEnumeration(Enumeration enmr)

Add the Enumeration to the end of the chain.

Parameters:

enmr - an Enumeration

addIterator

public void addIterator(Iterator iterator)

Add the Iterator to the end of the chain.

Parameters:

iterator - an Iterator

hasMoreElements

public boolean hasMoreElements()

Tests if this enumeration contains more elements.

Specified by:

hasMoreElements in interface Enumeration

Returns:

true if the enumeration contains more elements, false otherwise

nextElement

public Object nextElement()

Returns the next element of this enumeration.

Specified by:

nextElement in interface Enumeration

Returns:

the next element in the enumeration

hasNext

public boolean hasNext()

Tests if this Iterator contains more elements.

Specified by:

hasNext in interface Iterator

Returns:

true if the Iterator contains more elements, false otherwise

next

public Object next()

Returns the next element of this Iterator.

Specified by:

next in interface Iterator

Returns:

the next element in the Iterator

remove

public void remove()

Remove the last-returned element that was returned by the Iterator. This method always throws UnsupportedOperationException because the Iterator is immutable.

Specified by:

remove in interface Iterator

getIterator

protected Iterator getIterator()

Get the current or next enumeration in the list

Returns:

the current enumeration.

getRecentIterator

protected Iterator getRecentIterator()

Get the recently used iterator, if any.

Returns:

the iterator that was most recently used

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