/*
 * 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 "ElemIf.hpp"


#include <xercesc/sax/AttributeList.hpp>


#include <xalanc/PlatformSupport/DOMStringHelper.hpp>
#include <xalanc/PlatformSupport/XalanMessageLoader.hpp>


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


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


namespace XALAN_CPP_NAMESPACE {


ElemIf::ElemIf(
            StylesheetConstructionContext&  constructionContext,
            Stylesheet&                     stylesheetTree,
            const AttributeListType&        atts,
            XalanFileLoc                    lineNumber, 
            XalanFileLoc                    columnNumber) :
    ElemTemplateElement(
        constructionContext,
        stylesheetTree,
        lineNumber,
        columnNumber,
        StylesheetConstructionContext::ELEMNAME_IF),
    m_test(0)
{
    const XalanSize_t  nAttrs = atts.getLength();

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

        if (equals(aname, Constants::ATTRNAME_TEST))
        {
            m_test = constructionContext.createXPath(getLocator(), atts.getValue(i), *this);
        }
        else if(isAttrOK(
                    aname,
                    atts,
                    i,
                    constructionContext) == false &&
                processSpaceAttr(
                    Constants::ELEMNAME_IF_WITH_PREFIX_STRING.c_str(),
                    aname,
                    atts,
                    i,
                    constructionContext) == false)
        {
            error(
                constructionContext,
                XalanMessages::ElementHasIllegalAttribute_2Param,
                Constants::ELEMNAME_IF_WITH_PREFIX_STRING.c_str(),
                aname);
        }
    }

    if (0 == m_test)
    {
        error(
            constructionContext,
            XalanMessages::ElementMustHaveAttribute_2Param,
            Constants::ELEMNAME_IF_WITH_PREFIX_STRING,
            Constants::ATTRNAME_TEST);
    }
}


const XalanDOMString&
ElemIf::getElementName() const
{
    return Constants::ELEMNAME_IF_WITH_PREFIX_STRING;
}


#if !defined(XALAN_RECURSIVE_STYLESHEET_EXECUTION)
const ElemTemplateElement*
ElemIf::startElement(StylesheetExecutionContext&        executionContext) const
{
    assert(m_test != 0);

    ElemTemplateElement::startElement(executionContext);

    bool    fResult;

    m_test->execute(*this, executionContext, fResult);

    if (0 != executionContext.getTraceListeners())
    {
        executionContext.fireSelectEvent(
            SelectionEvent(executionContext,
            executionContext.getCurrentNode(),
            *this,
            XalanDOMString("test", executionContext.getMemoryManager()),
            *m_test,
            fResult));
    }

    if (fResult == true)
    {
        executionContext.pushExecuteIf(true);
        return beginExecuteChildren(executionContext);
    }

    executionContext.pushExecuteIf(false);

    return 0;
}


void
ElemIf::endElement(StylesheetExecutionContext&  executionContext) const
{
    if (executionContext.popExecuteIf())
    {
        endExecuteChildren(executionContext);
    }
}
#endif


#if defined(XALAN_RECURSIVE_STYLESHEET_EXECUTION)
void
ElemIf::execute(StylesheetExecutionContext&     executionContext) const
{
    assert(m_test != 0);

    ElemTemplateElement::execute(executionContext);

    bool    fResult;

    m_test->execute(*this, executionContext, fResult);

    if (0 != executionContext.getTraceListeners())
    {
        executionContext.fireSelectEvent(
            SelectionEvent(executionContext,
            executionContext.getCurrentNode(),
            *this,
            XalanDOMString("test", executionContext.getMemoryManager()),
            *m_test,
            fResult));
    }

    if (fResult == true)
    {
        executeChildren(executionContext);
    }
}
#endif


const XPath*
ElemIf::getXPath(XalanSize_t    index) const
{
    return index == 0 ? m_test : 0;
}


}