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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */

package scala.xml

import Utility.sbToString

/** The class `NamespaceBinding` represents namespace bindings
* and scopes. The binding for the default namespace is treated as a null
* prefix. the absent namespace is represented with the null uri. Neither
* prefix nor uri may be empty, which is not checked.
*
* @author Burak Emir
* @version 1.0
*/
@SerialVersionUID(0 - 2518644165573446725L)
case class NamespaceBinding(prefix: String, uri: String, parent: NamespaceBinding) extends AnyRef with Equality
{
  if (prefix == "")
    throw new IllegalArgumentException("zero length prefix not allowed")

  def getURI(_prefix: String): String =
    if (prefix == _prefix) uri else parent getURI _prefix

  /** Returns some prefix that is mapped to the URI.
*
* @param _uri the input URI
* @return the prefix that is mapped to the input URI, or null
* if no prefix is mapped to the URI.
*/
  def getPrefix(_uri: String): String =
    if (_uri == uri) prefix else parent getPrefix _uri

  override def toString(): String = sbToString(buildString(_, TopScope))

  override def canEqual(other: Any) = other match {
    case _: NamespaceBinding => true
    case _ => false
  }

  override def strict_==(other: Equality) = other match {
    case x: NamespaceBinding => (prefix == x.prefix) && (uri == x.uri) && (parent == x.parent)
    case _ => false
  }

  def basisForHashCode: Seq[Any] = List(prefix, uri, parent)

  def buildString(stop: NamespaceBinding): String = sbToString(buildString(_, stop))

  def buildString(sb: StringBuilder, stop: NamespaceBinding) {
    if (this eq stop) return // contains?

    val s = " xmlns%s=\"%s\"".format(
      (if (prefix != null) ":" + prefix else ""),
      (if (uri != null) uri else "")
    )
    parent.buildString(sb append s, stop) // copy(ignore)
  }
}
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