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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.xml
/** This singleton object contains the `apply` and `unapply` methods for
* convenient construction and deconstruction.
*
* @author Burak Emir
* @version 1.0
*/
object Attribute {
def unapply(x: Attribute) = x match {
case PrefixedAttribute(_, key, value, next) => Some((key, value, next))
case UnprefixedAttribute(key, value, next) => Some((key, value, next))
case _ => None
}
/** Convenience functions which choose Un/Prefixedness appropriately */
def apply(key: String, value: Seq[Node], next: MetaData): Attribute =
new UnprefixedAttribute(key, value, next)
def apply(pre: String, key: String, value: String, next: MetaData): Attribute =
if (pre == null || pre == "") new UnprefixedAttribute(key, value, next)
else new PrefixedAttribute(pre, key, value, next)
def apply(pre: String, key: String, value: Seq[Node], next: MetaData): Attribute =
if (pre == null || pre == "") new UnprefixedAttribute(key, value, next)
else new PrefixedAttribute(pre, key, value, next)
def apply(pre: Option[String], key: String, value: Seq[Node], next: MetaData): Attribute =
pre match {
case None => new UnprefixedAttribute(key, value, next)
case Some(p) => new PrefixedAttribute(p, key, value, next)
}
}
/** The `Attribute` trait defines the interface shared by both
* [[scala.xml.PrefixedAttribute]] and [[scala.xml.UnprefixedAttribute]].
*
* @author Burak Emir
* @version 1.0
*/
abstract trait Attribute extends MetaData {
def pre: String // will be null if unprefixed
val key: String
val value: Seq[Node]
val next: MetaData
def apply(key: String): Seq[Node]
def apply(namespace: String, scope: NamespaceBinding, key: String): Seq[Node]
def copy(next: MetaData): Attribute
def remove(key: String) =
if (!isPrefixed && this.key == key) next
else copy(next remove key)
def remove(namespace: String, scope: NamespaceBinding, key: String) =
if (this.key == key && (scope getURI pre) == namespace) next
else copy(next.remove(namespace, scope, key))
def isPrefixed: Boolean = pre != null
def getNamespace(owner: Node): String
def wellformed(scope: NamespaceBinding): Boolean = {
val arg = if (isPrefixed) scope getURI pre else null
(next(arg, scope, key) == null) && (next wellformed scope)
}
/** Returns an iterator on attributes */
override def iterator: Iterator[MetaData] = {
if (value == null) next.iterator
else Iterator.single(this) ++ next.iterator
}
override def size: Int = {
if (value == null) next.size
else 1 + next.size
}
/** Appends string representation of only this attribute to stringbuffer.
*/
protected def toString1(sb: StringBuilder) {
if (value == null)
return
if (isPrefixed)
sb append pre append ':'
sb append key append '='
val sb2 = new StringBuilder()
Utility.sequenceToXML(value, TopScope, sb2, true)
Utility.appendQuoted(sb2.toString, sb)
}
}
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