/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the  "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "ElemChoose.hpp"


#include <xercesc/sax/AttributeList.hpp>


#include <xalanc/PlatformSupport/XalanMessageLoader.hpp>


#include <xalanc/XPath/XObjectFactory.hpp>
#include <xalanc/XPath/XPath.hpp>


#include "Constants.hpp"
#include "ElemWhen.hpp"
#include "SelectionEvent.hpp"
#include "Stylesheet.hpp"
#include "StylesheetConstructionContext.hpp"
#include "StylesheetExecutionContext.hpp"
#include "StylesheetRoot.hpp"


namespace XALAN_CPP_NAMESPACE {


ElemChoose::ElemChoose(
            StylesheetConstructionContext&  constructionContext,
            Stylesheet&                     stylesheetTree,
            const AttributeListType&        atts,
            XalanFileLoc                    lineNumber,
            XalanFileLoc                    columnNumber) :
    ElemTemplateElement(constructionContext,
                        stylesheetTree,
                        lineNumber,
                        columnNumber,
                        StylesheetConstructionContext::ELEMNAME_CHOOSE)
{
    const XalanSize_t   nAttrs = atts.getLength();

    for (XalanSize_t i = 0; i < nAttrs; i++)
    {
        const XalanDOMChar* const   aname = atts.getName(i);

        if (isAttrOK(
                aname,
                atts,
                i,
                constructionContext) == false &&
            processSpaceAttr(
                Constants::ELEMNAME_CHOOSE_WITH_PREFIX_STRING.c_str(),
                aname,
                atts,
                i,
                constructionContext) == false)
        {
            error(
                constructionContext,
                XalanMessages::ElementHasIllegalAttribute_2Param,
                Constants::ELEMNAME_CHOOSE_WITH_PREFIX_STRING.c_str(),
                aname);
        }
    }
}


const XalanDOMString&
ElemChoose::getElementName() const
{
    return Constants::ELEMNAME_CHOOSE_WITH_PREFIX_STRING;
}


#if !defined(XALAN_RECURSIVE_STYLESHEET_EXECUTION)
const ElemTemplateElement*
ElemChoose::startElement(StylesheetExecutionContext&        executionContext) const
{
    ElemTemplateElement::startElement(executionContext);

    XalanNode* sourceNode = executionContext.getCurrentNode();

    for (const ElemTemplateElement* node = getFirstChildElem();
            node != 0;
                node = node->getNextSiblingElem()) 
    {
        const int   type = node->getXSLToken();

        if (StylesheetConstructionContext::ELEMNAME_WHEN == type)
        {

            const XPath* const      theXPath = node->getXPath(0);
            assert(theXPath != 0);

            bool    test;

            theXPath->execute(*this, executionContext, test);

            if (0 != executionContext.getTraceListeners())
            {
                executionContext.fireSelectEvent(
                    SelectionEvent(executionContext,
                    sourceNode,
                    *node,
                    Constants::ATTRNAME_TEST,
                    *theXPath,
                    test));
            }

            if(test == true)
            {
                return node;
            }
        }
        else
        {
            // xsl:otherwise
            return node;
        }
    }
    return 0;
}


const ElemTemplateElement*
ElemChoose::getNextChildElemToExecute(
            StylesheetExecutionContext& /*executionContext*/,
            const ElemTemplateElement*  /*currentElem*/) const
{
    return 0;
}
#endif


#if defined(XALAN_RECURSIVE_STYLESHEET_EXECUTION)
void
ElemChoose::execute(StylesheetExecutionContext&     executionContext) const
{
    ElemTemplateElement::execute(executionContext);

    XalanNode* sourceNode = executionContext.getCurrentNode();

    for (const ElemTemplateElement* node = getFirstChildElem();
            node != 0;
                node = node->getNextSiblingElem()) 
    {
        const int   type = node->getXSLToken();

        if(StylesheetConstructionContext::ELEMNAME_WHEN == type)
        {

            const XPath* const      theXPath = node->getXPath(0);
            assert(theXPath != 0);

            bool    test;

            theXPath->execute(*this, executionContext, test);

            if(0 != executionContext.getTraceListeners())
            {
                executionContext.fireSelectEvent(
                    SelectionEvent(executionContext,
                    sourceNode,
                    *node,
                    Constants::ATTRNAME_TEST,
                    *theXPath,
                    test));
            }

            if(test == true)
            {
                node->execute(executionContext);

                break;
            }
        }
        else
        {
            // xsl:otherwise
            node->execute(executionContext);
        }
    }
}
#endif


bool
ElemChoose::childTypeAllowed(int    xslToken) const
{
    bool    fResult = false;
    
    switch(xslToken)
    {
    // char-instructions 
    case StylesheetConstructionContext::ELEMNAME_WHEN:
    case StylesheetConstructionContext::ELEMNAME_OTHERWISE:
        fResult = true;
        break;
        
    default:
        break;
    }
    
    return fResult;
}


}