/*
 * 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 "FunctionString.hpp"


#include <xalanc/PlatformSupport/XalanMessageLoader.hpp>


#include <xalanc/DOMSupport/DOMServices.hpp>


#include "XObjectFactory.hpp"


namespace XALAN_CPP_NAMESPACE {


FunctionString::FunctionString()
{
}


FunctionString::~FunctionString()
{
}


XObjectPtr
FunctionString::execute(
            XPathExecutionContext&  executionContext,
            XalanNode*              context,
            const Locator*          locator) const
{
    if (context == 0)
    {
        const GetCachedString   theGuard(executionContext);

        XalanDOMString&         theResult = theGuard.get();

        executionContext.problem(
            XPathExecutionContext::eXPath,
            XPathExecutionContext::eError,
            XalanMessageLoader::getMessage(
                theResult,
                XalanMessages::FunctionRequiresNonNullContextNode_1Param,
                "string"),
            locator,
            context);

        // Dummy return value...
        return XObjectPtr();
    }
    else
    {
        // The XPath standard says that if there are no arguments,
        // the argument defaults to a node set with the context node
        // as the only member.  The string value of a node set is the
        // string value of the first node in the node set.
        // DOMServices::getNodeData() will give us the data.

        // Get a cached string...
        GetCachedString     theData(executionContext);

        XalanDOMString&     theString = theData.get();

        DOMServices::getNodeData(*context, executionContext, theString);

        return executionContext.getXObjectFactory().createString(theData);
    }
}


XObjectPtr
FunctionString::execute(
            XPathExecutionContext&  executionContext,
            XalanNode*              /* context */,          
            const XObjectPtr        arg1,
            const Locator* const    /* locator */) const
{
    assert(arg1.null() == false);   

    if (arg1->getType() == XObject::eTypeString)
    {
        // Since XObjects are reference counted, just return the
        // argument.
        return arg1;
    }
    else
    {
        return executionContext.getXObjectFactory().createStringAdapter(arg1, executionContext);
    }
}


FunctionString*
FunctionString::clone(MemoryManager&    theManager) const
{
    return XalanCopyConstruct(theManager, *this);
}


const XalanDOMString&
FunctionString::getError(XalanDOMString&    theResult) const
{
    return XalanMessageLoader::getMessage(
                theResult,
                XalanMessages::FunctionTakesZeroOrOneArg_1Param,
                "string()");
}


}