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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.xml
import collection.Seq
/** This singleton object contains the apply and unapplySeq methods for convenient construction and
* deconstruction. It is possible to deconstruct any Node instance (that is not a SpecialNode or
* a Group) using the syntax
* <code> case Elem(prefix, label, attribs, scope, child @ _*) => ... </code>
*
* Copyright 2008 Google Inc. All Rights Reserved.
* @author Burak Emir <bqe@google.com>
*/
object Elem
{
def apply(prefix: String,label: String, attributes: MetaData, scope: NamespaceBinding, child: Node*) =
new Elem(prefix,label,attributes,scope,child:_*)
def unapplySeq(n:Node) = if (n.isInstanceOf[SpecialNode] || n.isInstanceOf[Group]) None else
Some((n.prefix, n.label, n.attributes, n.scope, n.child))
}
/** The case class <code>Elem</code> extends the <code>Node</code> class,
* providing an immutable data object representing an XML element.
*
* @param prefix namespace prefix (may be null, but not the empty string)
* @param label the element name
* @param attribute the attribute map
* @param scope the scope containing the namespace bindings
* @param child the children of this node
*
* Copyright 2008 Google Inc. All Rights Reserved.
* @author Burak Emir <bqe@google.com>
*/
@serializable
class Elem(
override val prefix: String,
val label: String,
override val attributes: MetaData,
override val scope: NamespaceBinding,
val child: Node*)
extends Node
{
final override def doCollectNamespaces = true
final override def doTransform = true
if ((null != prefix) && 0 == prefix.length())
throw new IllegalArgumentException("prefix of zero length, use null instead")
if (null == scope)
throw new IllegalArgumentException("scope is null, try xml.TopScope for empty scope")
//@todo: copy the children,
// setting namespace scope if necessary
// cleaning adjacent text nodes if necessary
override def hashCode(): Int =
Utility.hashCode(prefix, label, attributes.hashCode(), scope.hashCode(), child)
/** Returns a new element with updated attributes, resolving namespace uris from this element's scope.
* See MetaData.update for details.
* @param updates MetaData with new and updated attributes
* @return a new symbol with updated attributes
*/
final def %(updates: MetaData): Elem =
copy(attributes = MetaData.update(attributes, scope, updates))
/** Returns a copy of this element with any supplied arguments replacing
* this element's value for that field.
*
* @return a new symbol with updated attributes
*/
def copy(
prefix: String = this.prefix,
label: String = this.label,
attributes: MetaData = this.attributes,
scope: NamespaceBinding = this.scope,
child: Seq[Node] = this.child.toSeq
): Elem = Elem(prefix, label, attributes, scope, child: _*)
/** Returns concatenation of <code>text(n)</code> for each child
* <code>n</code>.
*/
override def text = child map (_.text) mkString
}
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