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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2011, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.xml
import Utility.{ isNameStart }
import scala.collection.Iterator
/** Essentially, every method in here is a dummy, returning Zero[T].
* It provides a backstop for the unusual collection defined by MetaData,
* sort of a linked list of tails.
*/
case object Null extends MetaData {
override def iterator = Iterator.empty
override def append(m: MetaData, scope: NamespaceBinding = TopScope): MetaData = m
override def filter(f: MetaData => Boolean): MetaData = this
def copy(next: MetaData) = next
def getNamespace(owner: Node) = null
override def hasNext = false
def next = null
def key = null
def value = null
def isPrefixed = false
override def length = 0
override def length(i: Int) = i
override def strict_==(other: Equality) = other match {
case x: MetaData => x.length == 0
case _ => false
}
override def basisForHashCode: Seq[Any] = Nil
def apply(namespace: String, scope: NamespaceBinding, key: String) = null
def apply(key: String) = {
if (!isNameStart(key.head))
throw new IllegalArgumentException("not a valid attribute name '"+key+"', so can never match !")
null
}
def toString1(sb: StringBuilder) = ()
override def toString1(): String = ""
override def toString(): String = ""
override def buildString(sb: StringBuilder): StringBuilder = sb
override def wellformed(scope: NamespaceBinding) = true
def remove(key: String) = this
def remove(namespace: String, scope: NamespaceBinding, key: String) = this
}
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