/**
 * Copyright (C) 2010 Orbeon, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the
 * GNU Lesser General Public License as published by the Free Software Foundation; either version
 * 2.1 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * The full text of the license is available at http://www.gnu.org/copyleft/lesser.html
 */
package org.orbeon.oxf.xforms.function.xxforms

import org.orbeon.oxf.xforms.XFormsModel
import org.orbeon.oxf.xforms.XFormsUtils
import org.orbeon.oxf.xforms.function.{FunctionSupport, XFormsFunction}
import org.orbeon.saxon.expr.XPathContext
import org.orbeon.saxon.om.SequenceIterator
import scala.collection.JavaConverters._

class XXFormsListInstances extends XFormsFunction with FunctionSupport {

    override def iterate(xpathContext: XPathContext): SequenceIterator =
        resolveOrFindByStaticOrAbsoluteId(stringArgument(0)(xpathContext))(xpathContext) collect {
            case model: XFormsModel ⇒
                for {
                    instance    ← model.getInstances.asScala
                    effectiveId = instance.getEffectiveId
                    absoluteId  = XFormsUtils.effectiveIdToAbsoluteId(effectiveId)
                } yield
                    absoluteId
        }
}