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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.xml
import Utility.{ isNameStart }
case object Null extends MetaData {
/** appends given MetaData items to this MetaData list */
override def append(m: MetaData, scope: NamespaceBinding = TopScope): MetaData = m
override def containedIn1(m: MetaData): Boolean = false
/** returns its argument */
def copy(next: MetaData) = next
override def iterator = Iterator.empty
override def filter(f: MetaData => Boolean): MetaData = this
def getNamespace(owner: Node) = null
final override def hasNext = false
def next = null
def key = null
def value = null
final override def length = 0
final override def length(i: Int) = i
def isPrefixed = false
/** deep equals method - XXX */
override def equals(that: Any) = that match {
case m: MetaData => m.length == 0
case _ => false
}
def equals1(that:MetaData) = that.length == 0
override def map(f: MetaData => Text): List[Text] = Nil
/** null */
def apply(key: String) = {
if(!isNameStart(key charAt 0))
throw new IllegalArgumentException("not a valid attribute name '"+key+"', so can never match !")
null
}
/** gets value of qualified (prefixed) attribute with given key */
def apply(namespace: String, scope: NamespaceBinding, key: String) = null
override def hashCode(): Int = 0
override def toString1(): String = ""
//appends string representations of single attribute to StringBuilder
def toString1(sb:StringBuilder) = {}
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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