/**
 * 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.
 */

/*
 * XSEC
 *
 * XSECURIResolverXerces := Virtual Interface class that takes a URI and
 *                    creates a binary input stream from it.
 *
 * $Id$
 *
 */


#include <xsec/framework/XSECDefs.hpp>
#include <xsec/framework/XSECURIResolverXerces.hpp>
#include <xsec/framework/XSECError.hpp>

#include <xercesc/framework/URLInputSource.hpp>
#include <xercesc/util/XMLString.hpp>
#include <xercesc/util/Janitor.hpp>

XERCES_CPP_NAMESPACE_USE

#include <string.h>

// --------------------------------------------------------------------------------
//           Constructors and Destructors
// --------------------------------------------------------------------------------

XSECURIResolverXerces::XSECURIResolverXerces(const XMLCh* baseURI) {

    if (baseURI != 0) {

        mp_baseURI = XMLString::replicate(baseURI);

    }
    else
        mp_baseURI = NULL;
};

XSECURIResolverXerces::~XSECURIResolverXerces() {

    if (mp_baseURI != NULL)
        XSEC_RELEASE_XMLCH(mp_baseURI);
}

// --------------------------------------------------------------------------------
//           Interface Methods
// --------------------------------------------------------------------------------

XERCES_CPP_NAMESPACE_QUALIFIER BinInputStream* XSECURIResolverXerces::resolveURI(const XMLCh* uri) {

    XSEC_USING_XERCES(URLInputSource);
    XSEC_USING_XERCES(XMLURL);
    XSEC_USING_XERCES(BinInputStream);
    XSEC_USING_XERCES(XMLException);

    if (uri == NULL) {
        throw XSECException(XSECException::ErrorOpeningURI,
            "XSECURIResolverXerces - anonymous references not supported in default URI Resolvers");
    }

    try {
        URLInputSource* URLS;        // Use Xerces URL Input source

        if (mp_baseURI == 0) {
            URLS = new URLInputSource(XMLURL(uri));
        }
        else {
            URLS = new URLInputSource(XMLURL(XMLURL(mp_baseURI), uri));
        }

        // makeStream can (and is quite likely to) throw an exception
        Janitor<URLInputSource> j_URLS(URLS);

        BinInputStream* is = URLS->makeStream();

        if (is == NULL) {
            throw XSECException(XSECException::ErrorOpeningURI,
                "An error occurred in XSECURIREsolverXerces when opening an URLInputStream");
        }

        return is;
    }
    catch (XMLException& ex) {
        throw XSECException(XSECException::ErrorOpeningURI,
            "An error occurred in XSECURIREsolverXerces when opening an URLInputStream");
    }
}


XSECURIResolver* XSECURIResolverXerces::clone() {

    XSECURIResolverXerces* ret = new XSECURIResolverXerces();

    if (this->mp_baseURI != 0)
        ret->mp_baseURI = XMLString::replicate(this->mp_baseURI);
    else
        ret->mp_baseURI = 0;

    return ret;
}

// --------------------------------------------------------------------------------
//           Specific Methods
// --------------------------------------------------------------------------------


void XSECURIResolverXerces::setBaseURI(const XMLCh* uri) {

    if (mp_baseURI != 0)
        XSEC_RELEASE_XMLCH(mp_baseURI);

    mp_baseURI = XMLString::replicate(uri);
};