org.apache.http.message
Class BasicHeaderIterator

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

All Implemented Interfaces:

Iterator, HeaderIterator

public class BasicHeaderIterator
extends Object
implements HeaderIterator

Basic implementation of a HeaderIterator.

Since:

4.0

Field Summary

protected Header[]	allHeaders An array 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.

Constructor Summary

BasicHeaderIterator(Header[] 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() Removing headers is not supported.

Methods inherited from class java.lang.Object

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

Field Detail

allHeaders

protected final Header[] allHeaders

An array of headers to iterate over. Not all elements of this array are necessarily part of the iteration. This array will never be modified by the iterator. Derived implementations are expected to adhere to this restriction.

currentIndex

protected int currentIndex

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

headerName

protected String headerName

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

Constructor Detail

BasicHeaderIterator

public BasicHeaderIterator(Header[] headers,
                           String name)

Creates a new header iterator.

Parameters:

headers - an array 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

Removing headers is not supported.

Specified by:

remove in interface Iterator

Throws:

UnsupportedOperationException - always