org.apache.http.message
Class BasicListHeaderIterator

java.lang.Object
  org.apache.http.message.BasicListHeaderIterator

All Implemented Interfaces:

Iterator, HeaderIterator

public class BasicListHeaderIterator
extends Object
implements HeaderIterator

Implementation of a HeaderIterator based on a List. For use by HeaderGroup.

Since:

4.0

Field Summary

protected List	allHeaders A list of headers to iterate over.
protected int	currentIndex The position of the next header in allHeaders.
protected String	headerName The header name to filter by.
protected int	lastIndex The position of the last returned header.

Constructor Summary

BasicListHeaderIterator(List headers, String name)
Creates a new header iterator.

Method Summary

protected boolean	filterHeader(int index) Checks whether a header is part of the iteration.
protected int	findNext(int from) Determines the index of the next header.
boolean	hasNext() Indicates whether there is another header in this iteration.
Object	next() Returns the next header.
Header	nextHeader() Obtains the next header from this iteration.
void	remove() Removes the header that was returned last.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

allHeaders

protected final List allHeaders

A list of headers to iterate over. Not all elements of this array are necessarily part of the iteration.

currentIndex

protected int currentIndex

The position of the next header in allHeaders. Negative if the iteration is over.

lastIndex

protected int lastIndex

The position of the last returned header. Negative if none has been returned so far.

headerName

protected String headerName

The header name to filter by. null to iterate over all headers in the array.

Constructor Detail

BasicListHeaderIterator

public BasicListHeaderIterator(List headers,
                               String name)

Creates a new header iterator.

Parameters:

headers - a list of headers over which to iterate

name - the name of the headers over which to iterate, or null for any

Method Detail

findNext

protected int findNext(int from)

Determines the index of the next header.

Parameters:

from - one less than the index to consider first, -1 to search for the first header

Returns:

the index of the next header that matches the filter name, or negative if there are no more headers

filterHeader

protected boolean filterHeader(int index)

Checks whether a header is part of the iteration.

Parameters:

index - the index of the header to check

Returns:

true if the header should be part of the iteration, false to skip

hasNext

public boolean hasNext()

Description copied from interface: HeaderIterator

Indicates whether there is another header in this iteration.

Specified by:

hasNext in interface Iterator

Specified by:

hasNext in interface HeaderIterator

Returns:

true if there is another header, false otherwise

nextHeader

public Header nextHeader()
                  throws NoSuchElementException

Obtains the next header from this iteration.

Specified by:

nextHeader in interface HeaderIterator

Returns:

the next header in this iteration

Throws:

NoSuchElementException - if there are no more headers

next

public final Object next()
                  throws NoSuchElementException

Returns the next header. Same as nextHeader, but not type-safe.

Specified by:

next in interface Iterator

Returns:

the next header in this iteration

Throws:

NoSuchElementException - if there are no more headers

remove

public void remove()
            throws UnsupportedOperationException

Removes the header that was returned last.

Specified by:

remove in interface Iterator

Throws:

UnsupportedOperationException