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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2005, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.xml;
import scala.collection.mutable.ArrayBuffer;
/** The case class <code>Elem</code> implements the Node trait,
* providing an immutable data object representing an XML element.
*
* @param prefix (may be null)
* @param label the element name
* @param attribute the attribute map
* @param child the children of this node
* @author Burak Emir
*/
// "val" is redundant for non-overriding arguments
case class Elem(override val prefix: String,
val label: String,
override val attributes: MetaData,
override val scope: NamespaceBinding,
val child: Node*) extends Node {
if (prefix != null && 0 == prefix.length())
scala.Predef.error("prefix of zero length, use null instead");
if (null == scope)
scala.Predef.error("scope is null");
//@todo: copy the children,
// setting namespace scope if necessary
// cleaning adjacent text nodes if necessary
//final val namespaceIntern = namespace$$.intern();
//final def namespace = namespaceIntern;
//final val labelIntern = label$$.intern();
//final def label = labelIntern;
final override def typeTag$: Int = 0;
override def hashCode(): Int = {
Utility.hashCode(prefix, label, attributes.hashCode(), scope.hashCode(), child);
}
/** Return a new element with updated attributes
*
* @param attrs
* @return a new symbol with updated attributes
*/
final def %(attrs: MetaData): Elem =
Elem(prefix,
label,
attrs.append(attributes),
scope,
child:_*);
/* returns concatenation of text(n) for each child n */
override def text = {
val sb = new StringBuffer();
val it = child.elements;
while(it.hasNext) {
sb.append(it.next.text);
}
sb.toString()
}
}
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