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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2007, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.xml
/** prefixed attributes always have a non-null namespace.
*
* @param pre ...
* @param key ...
* @param value the attribute value, which may not be null
* @param next ...
*/
class PrefixedAttribute(val pre: String,
val key: String,
val value: Seq[Node],
val next: MetaData) extends MetaData {
if(value eq null)
throw new UnsupportedOperationException("value is null")
/** same as this(key, Utility.parseAttributeValue(value), next) */
def this(pre: String, key: String, value: String, next: MetaData) =
this(pre, key, Text(value), next)
/*
// the problem here is the fact that we cannot remove the proper attribute from
// next, and thus cannot guarantee that hashcodes are computed properly
def this(pre: String, key: String, value: scala.AllRef, next: MetaData) =
throw new UnsupportedOperationException("can't construct prefixed nil attributes")
*/
/** Returns a copy of this unprefixed attribute with the given
* next field.
*/
def copy(next: MetaData) =
new PrefixedAttribute(pre, key, value, next)
def equals1(m: MetaData) =
(m.isPrefixed &&
(m.asInstanceOf[PrefixedAttribute].pre == pre) &&
(m.key == key) && (m.value sameElements value))
def getNamespace(owner: Node) =
owner.getNamespace(pre)
/** forwards the call to next (because caller looks for unprefixed attribute */
def apply(key: String): Seq[Node] = next(key)
/** gets attribute value of qualified (prefixed) attribute with given key
*/
def apply(namespace: String, scope: NamespaceBinding, key: String): Seq[Node] = {
if (key == this.key && scope.getURI(pre) == namespace)
value
else
next(namespace, scope, key)
}
/** returns true */
final def isPrefixed = true
/** returns the hashcode.
*/
override def hashCode() =
pre.hashCode() * 41 + key.hashCode() * 7 + next.hashCode()
/** appends string representation of only this attribute to stringbuffer */
def toString1(sb:StringBuilder): Unit = if(value ne null) {
sb.append(pre)
sb.append(':')
sb.append(key)
sb.append('=')
val sb2 = new StringBuilder()
for (c <- value) Utility.toXML(c, TopScope, sb2, true)
Utility.appendQuoted(sb2.toString(), sb)
}
def wellformed(scope: NamespaceBinding): Boolean =
(null == next(scope.getURI(pre), scope, key) &&
next.wellformed(scope))
def remove(key: String) =
copy(next.remove(key))
def remove(namespace: String, scope: NamespaceBinding, key: String): MetaData =
if (key == this.key && scope.getURI(pre) == namespace)
next
else
next.remove(namespace, scope, key)
}
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