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## org.apache.commons.httpclient
Class HeaderElement

    java.lang.Object
      org.apache.commons.httpclient.NameValuePair
          org.apache.commons.httpclient.HeaderElement

All Implemented Interfaces:
  Serializable

    public class HeaderElement

extends NameValuePair

One element of an HTTP header's value.

Some HTTP headers (such as the set-cookie header) have values that can be decomposed into multiple elements. Such headers must be in the following form:

     header  = [ element ] *( "," [ element ] )
     element = name [ "=" [ value ] ] *( ";" [ param ] )
     param   = name [ "=" [ value ] ]

     name    = token
     value   = ( token | quoted-string )

     token         = 1*<any char except "=", ",", ";", <"> and
                           white space>
     quoted-string = <"> *( text | quoted-char ) <">
     text          = any char except <">
     quoted-char   = "\" char

Any amount of white space is allowed between any part of the header, element or param and is ignored. A missing value in any element or param will be stored as the empty `String`; if the "=" is also missing null will be stored instead.

This class represents an individual header element, containing both a name/value pair (value may be `null`) and optionally a set of additional parameters.

This class also exposes a `parse(java.lang.String)` method for parsing a `Header` value into an array of elements.

Since:
  1.0
Version:
  $Revision: 480424 $ $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $
Author:
  B.C. Holmes, Park, Sung-Gu, Mike Bowler, Oleg Kalnichevski
See Also:
  `Header`, Serialized Form

Constructor Summary
`HeaderElement()` Default constructor.
`HeaderElement(char[] chars)` Constructor with array of characters.
`HeaderElement(char[] chars, int offset, int length)` Constructor with array of characters.
`HeaderElement(String name, String value)` Constructor.
`HeaderElement(String name, String value, NameValuePair[] parameters)` Constructor with name, value and parameters.

Method Summary
`NameValuePair` | `getParameterByName(String name)` Returns parameter with the given name, if found.
`NameValuePair[]` | `getParameters()` Get parameters, if any.
`static HeaderElement[]` | `parse(String headerValue)` Deprecated. Use #parseElements(String).
`static HeaderElement[]` | `parseElements(char[] headerValue)` This parses the value part of a header.
`static HeaderElement[]` | `parseElements(String headerValue)` This parses the value part of a header.

Methods inherited from class org.apache.commons.httpclient.NameValuePair
`equals, getName, getValue, hashCode, setName, setValue, toString`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail

### HeaderElement

    public HeaderElement()

  Default constructor.

### HeaderElement

    public HeaderElement(String name,
                         String value)

  Constructor.

  Parameters:
    `name` - my name
    `value` - my (possibly `null`) value

### HeaderElement

    public HeaderElement(String name,
                         String value,
                         NameValuePair[] parameters)

  Constructor with name, value and parameters.

  Parameters:
    `name` - my name
    `value` - my (possibly `null`) value
    `parameters` - my (possibly `null`) parameters

### HeaderElement

    public HeaderElement(char[] chars,
                         int offset,
                         int length)

  Constructor with array of characters.

  Parameters:
    `chars` - the array of characters
    `offset` - - the initial offset.
    `length` - - the length.
  Since:
    3.0

### HeaderElement

    public HeaderElement(char[] chars)

  Constructor with array of characters.

  Parameters:
    `chars` - the array of characters
  Since:
    3.0

Method Detail

### getParameters

    public NameValuePair[] getParameters()

  Get parameters, if any.

  Returns:
    parameters as an array of `NameValuePair`s
  Since:
    2.0

### parseElements

    public static final HeaderElement[] parseElements(char[] headerValue)

  This parses the value part of a header. The result is an array of HeaderElement objects.

  Parameters:
    `headerValue` - the array of char representation of the header value (as received from the web server).
  Returns:
    array of `HeaderElement`s.
  Since:
    3.0

### parseElements

    public static final HeaderElement[] parseElements(String headerValue)

  This parses the value part of a header. The result is an array of HeaderElement objects.

  Parameters:
    `headerValue` - the string representation of the header value (as received from the web server).
  Returns:
    array of `HeaderElement`s.
  Since:
    3.0

### parse

    public static final HeaderElement[] parse(String headerValue)
                                       throws HttpException

  Deprecated. Use #parseElements(String).

  This parses the value part of a header. The result is an array of HeaderElement objects.

  Parameters:
    `headerValue` - the string representation of the header value (as received from the web server).
  Returns:
    array of `HeaderElement`s.
  Throws:
    `HttpException` - if the above syntax rules are violated.

### getParameterByName

    public NameValuePair getParameterByName(String name)

  Returns parameter with the given name, if found. Otherwise null is returned

  Parameters:
    `name` - The name to search by.
  Returns:
    NameValuePair parameter with the given name

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