axiom/src/parser/libxml2/libxml2_reader_wrapper.c

/*
 * 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 <axiom_xml_reader.h>
#include <libxml/xmlreader.h>
#include <libxml/parser.h>
#include <axutil_utils_defines.h>
#include <axutil_utils.h>
#include <string.h>
#include <axutil_string.h>

#define AXIS2_ATTR_NS_MAX   20

int AXIS2_CALL
axis2_libxml2_reader_wrapper_next(axiom_xml_reader_t *parser,
    const axutil_env_t *env);

void AXIS2_CALL
axis2_libxml2_reader_wrapper_free(axiom_xml_reader_t *parser,
    const axutil_env_t *env);

int AXIS2_CALL
axis2_libxml2_reader_wrapper_get_attribute_count(axiom_xml_reader_t *parser,
    const axutil_env_t *env);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_attribute_name_by_number(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    int i);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_attribute_prefix_by_number(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    int i);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_attribute_value_by_number(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    int i);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_attribute_namespace_by_number(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    int i);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_value(axiom_xml_reader_t *parser,
    const axutil_env_t *env);

int AXIS2_CALL
axis2_libxml2_reader_wrapper_get_namespace_count(axiom_xml_reader_t *parser,
    const axutil_env_t *env);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_namespace_uri_by_number(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    int i);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_namespace_prefix_by_number(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    int i);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_prefix(axiom_xml_reader_t *parser,
    const axutil_env_t *env);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_name(axiom_xml_reader_t *parser,
    const axutil_env_t *env);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_pi_target(axiom_xml_reader_t *parser,
    const axutil_env_t *env);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_pi_data(axiom_xml_reader_t *parser,
    const axutil_env_t *env);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_dtd(axiom_xml_reader_t *parser,
    const axutil_env_t *env);

void AXIS2_CALL
axis2_libxml2_reader_wrapper_xml_free(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    void *data);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_char_set_encoding(axiom_xml_reader_t *parser,
    const axutil_env_t *env);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_namespace_uri(axiom_xml_reader_t *parser,
        const axutil_env_t *env);

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_namespace_uri_by_prefix(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    axis2_char_t *prefix);

axis2_status_t
axis2_libxml2_reader_wrapper_fill_maps(axiom_xml_reader_t *parser,
    const axutil_env_t *env);

void
axis2_libxml2_reader_wrapper_error_handler(void *arg,
    const char *msg,
    int severities,
    void *locator_ptr);

static int
axis2_libxml2_reader_wrapper_read_input_callback(void *ctx,
    char *buffer,
    int size);

static int
axis2_libxml2_reader_wrapper_close_input_callback(void *ctx);

typedef struct axis2_libxml2_reader_wrapper_impl_t
{
    axiom_xml_reader_t parser;

    xmlTextReaderPtr reader;

    int current_event;
    int current_attribute_count;
    int current_namespace_count;
    int event_map[18];

    void* ctx;
    /* assuming that max ns and attri will be 20 */

    int namespace_map[AXIS2_ATTR_NS_MAX];
    int attribute_map[AXIS2_ATTR_NS_MAX];

    AXIS2_READ_INPUT_CALLBACK read_input_callback;

    AXIS2_CLOSE_INPUT_CALLBACK close_input_callback;

}
axis2_libxml2_reader_wrapper_impl_t;

#define AXIS2_INTF_TO_IMPL(p) ((axis2_libxml2_reader_wrapper_impl_t*)p)
#define AXIS2_IMPL_TO_INTF(p) &(p->parser)

static const axiom_xml_reader_ops_t axiom_xml_reader_ops_var = {
    axis2_libxml2_reader_wrapper_next,
    axis2_libxml2_reader_wrapper_free,
    axis2_libxml2_reader_wrapper_get_attribute_count,
    axis2_libxml2_reader_wrapper_get_attribute_name_by_number,
    axis2_libxml2_reader_wrapper_get_attribute_prefix_by_number,
    axis2_libxml2_reader_wrapper_get_attribute_value_by_number,
    axis2_libxml2_reader_wrapper_get_attribute_namespace_by_number,
    axis2_libxml2_reader_wrapper_get_value,
    axis2_libxml2_reader_wrapper_get_namespace_count,
    axis2_libxml2_reader_wrapper_get_namespace_uri_by_number,
    axis2_libxml2_reader_wrapper_get_namespace_prefix_by_number,
    axis2_libxml2_reader_wrapper_get_prefix,
    axis2_libxml2_reader_wrapper_get_name,
    axis2_libxml2_reader_wrapper_get_pi_target,
    axis2_libxml2_reader_wrapper_get_pi_data,
    axis2_libxml2_reader_wrapper_get_dtd,
    axis2_libxml2_reader_wrapper_xml_free,
    axis2_libxml2_reader_wrapper_get_char_set_encoding,
    axis2_libxml2_reader_wrapper_get_namespace_uri,
    axis2_libxml2_reader_wrapper_get_namespace_uri_by_prefix
};

static axis2_status_t
axis2_libxml2_reader_wrapper_init_map(axis2_libxml2_reader_wrapper_impl_t *parser)
{
    int i = 0;
    if (parser)
    {
        for (i = 0;i < 18;i++)
        {
            parser->event_map[i] = -1;
        }

        parser->event_map[XML_READER_TYPE_ELEMENT] =
            AXIOM_XML_READER_START_ELEMENT;

        parser->event_map[XML_READER_TYPE_ELEMENT] =
            AXIOM_XML_READER_START_ELEMENT;

        parser->event_map[XML_READER_TYPE_DOCUMENT] =
            AXIOM_XML_READER_START_DOCUMENT;

        parser->event_map[XML_READER_TYPE_TEXT] = AXIOM_XML_READER_CHARACTER;

        parser->event_map[XML_READER_TYPE_CDATA] = AXIOM_XML_READER_CHARACTER;

        parser->event_map[XML_READER_TYPE_SIGNIFICANT_WHITESPACE] =
            AXIOM_XML_READER_SPACE;

        parser->event_map[XML_READER_TYPE_WHITESPACE] = AXIOM_XML_READER_SPACE;

        parser->event_map[XML_READER_TYPE_END_ELEMENT] =
            AXIOM_XML_READER_END_ELEMENT;

        parser->event_map [XML_READER_TYPE_ENTITY_REFERENCE] =
            AXIOM_XML_READER_ENTITY_REFERENCE;

        parser->event_map [XML_READER_TYPE_END_ENTITY] = AXIOM_XML_READER_SPACE;

        parser->event_map[XML_READER_TYPE_ENTITY] = AXIOM_XML_READER_SPACE;

        parser->event_map[XML_READER_TYPE_PROCESSING_INSTRUCTION] =
            AXIOM_XML_READER_PROCESSING_INSTRUCTION;

        parser->event_map[XML_READER_TYPE_COMMENT] = AXIOM_XML_READER_COMMENT;

        parser->event_map[XML_READER_TYPE_DOCUMENT_TYPE] =
            AXIOM_XML_READER_DOCUMENT_TYPE;
        return AXIS2_SUCCESS;
    }
    return AXIS2_FAILURE;
}

AXIS2_EXTERN  axis2_status_t  AXIS2_CALL
axiom_xml_reader_init()
{
    xmlInitParser();
    return AXIS2_SUCCESS;
}

AXIS2_EXTERN  axis2_status_t  AXIS2_CALL
axiom_xml_reader_cleanup()
{
    xmlCleanupParser();
    return AXIS2_SUCCESS;
}

AXIS2_EXTERN axiom_xml_reader_t *AXIS2_CALL
axiom_xml_reader_create_for_file(const axutil_env_t *env,
    char *filename,
    const axis2_char_t *encoding)
{

    axis2_libxml2_reader_wrapper_impl_t *wrapper_impl = NULL;
    AXIS2_ENV_CHECK(env, NULL);
    AXIS2_PARAM_CHECK(env->error, filename, NULL);

    wrapper_impl = (axis2_libxml2_reader_wrapper_impl_t*)AXIS2_MALLOC(env->allocator,
        sizeof(axis2_libxml2_reader_wrapper_impl_t));
    if (!wrapper_impl)
    {
        AXIS2_ERROR_SET(env->error, AXIS2_ERROR_NO_MEMORY, AXIS2_FAILURE);
        return NULL;
    }

    wrapper_impl->reader =  xmlReaderForFile(filename, encoding, XML_PARSE_RECOVER);
    if (!(wrapper_impl->reader))
    {
        AXIS2_FREE(env->allocator, wrapper_impl);
        AXIS2_ERROR_SET(env->error, AXIS2_ERROR_CREATING_XML_STREAM_READER, AXIS2_FAILURE);
        return NULL;
    }

    xmlTextReaderSetErrorHandler(wrapper_impl->reader,
        (xmlTextReaderErrorFunc)axis2_libxml2_reader_wrapper_error_handler,
        (void *)env);
    wrapper_impl->current_event = -1;
    wrapper_impl->ctx = NULL;

    axis2_libxml2_reader_wrapper_init_map(wrapper_impl);

    wrapper_impl->parser.ops = &axiom_xml_reader_ops_var;
    return &(wrapper_impl->parser);
}

AXIS2_EXTERN axiom_xml_reader_t *AXIS2_CALL
axiom_xml_reader_create_for_io(const axutil_env_t *env,
    AXIS2_READ_INPUT_CALLBACK read_input_callback,
    AXIS2_CLOSE_INPUT_CALLBACK close_input_callback,
    void* ctx,
    const axis2_char_t *encoding)
{
    axis2_libxml2_reader_wrapper_impl_t *wrapper_impl = NULL;

    AXIS2_ENV_CHECK(env, NULL);

    if (!read_input_callback)
    {
        return NULL;
    }

    wrapper_impl = (axis2_libxml2_reader_wrapper_impl_t*)AXIS2_MALLOC(env->allocator,
        sizeof(axis2_libxml2_reader_wrapper_impl_t));
    if (!wrapper_impl)
    {
        AXIS2_ERROR_SET(env->error, AXIS2_ERROR_NO_MEMORY, AXIS2_FAILURE);
        return NULL;
    }
    wrapper_impl->close_input_callback = NULL;
    wrapper_impl->read_input_callback = NULL;
    wrapper_impl->read_input_callback = read_input_callback;
    wrapper_impl->close_input_callback = close_input_callback;
    wrapper_impl->ctx = ctx;
    if (wrapper_impl->close_input_callback)
    {
        wrapper_impl->reader =
            xmlReaderForIO(axis2_libxml2_reader_wrapper_read_input_callback,
                axis2_libxml2_reader_wrapper_close_input_callback,
                wrapper_impl, NULL, encoding, XML_PARSE_RECOVER);
    }
    else
    {
        wrapper_impl->reader =  xmlReaderForIO(axis2_libxml2_reader_wrapper_read_input_callback,
            NULL, wrapper_impl, NULL, encoding, XML_PARSE_RECOVER);
    }
    if (!(wrapper_impl->reader))
    {
        AXIS2_FREE(env->allocator, wrapper_impl);
        AXIS2_ERROR_SET(env->error, AXIS2_ERROR_CREATING_XML_STREAM_READER, AXIS2_FAILURE);
        return NULL;
    }

    xmlTextReaderSetErrorHandler(wrapper_impl->reader,
        (xmlTextReaderErrorFunc)axis2_libxml2_reader_wrapper_error_handler,
        (void *)env);

    wrapper_impl->current_event = -1;

    axis2_libxml2_reader_wrapper_init_map(wrapper_impl);

    wrapper_impl->parser.ops = &axiom_xml_reader_ops_var;
    return &(wrapper_impl->parser);
}

AXIS2_EXTERN axiom_xml_reader_t *AXIS2_CALL
axiom_xml_reader_create_for_memory(const axutil_env_t *env,
    void *container,
    int size,
    const axis2_char_t *encoding,
    int type)
{
    axis2_libxml2_reader_wrapper_impl_t *wrapper_impl = NULL;

    AXIS2_ENV_CHECK(env, NULL);
    AXIS2_PARAM_CHECK(env->error, container , NULL);

    wrapper_impl = (axis2_libxml2_reader_wrapper_impl_t*)AXIS2_MALLOC(env->allocator,
        sizeof(axis2_libxml2_reader_wrapper_impl_t));
    if (!wrapper_impl)
    {
        AXIS2_ERROR_SET(env->error, AXIS2_ERROR_NO_MEMORY, AXIS2_FAILURE);
        return NULL;
    }
    wrapper_impl->close_input_callback = NULL;
    wrapper_impl->read_input_callback = NULL;
    wrapper_impl->ctx = NULL;

    if (AXIS2_XML_PARSER_TYPE_BUFFER == type)
    {
        wrapper_impl->reader =  xmlReaderForMemory((axis2_char_t*)container, size,
            NULL, encoding, XML_PARSE_RECOVER);
    }
    else if (AXIS2_XML_PARSER_TYPE_DOC == type)
    {
        wrapper_impl->reader =  xmlReaderWalker((xmlDocPtr)container);
    }
    else
    {
        AXIS2_FREE(env->allocator, wrapper_impl);
        AXIS2_ERROR_SET(env->error, AXIS2_ERROR_XML_PARSER_INVALID_MEM_TYPE, AXIS2_FAILURE);
        return NULL;
    }

    if (!(wrapper_impl->reader))
    {
        AXIS2_FREE(env->allocator, wrapper_impl);
        AXIS2_ERROR_SET(env->error,
            AXIS2_ERROR_CREATING_XML_STREAM_READER, AXIS2_FAILURE);
        return NULL;
    }

    if (AXIS2_XML_PARSER_TYPE_BUFFER == type)
    {
        xmlTextReaderSetErrorHandler(wrapper_impl->reader,
            (xmlTextReaderErrorFunc)axis2_libxml2_reader_wrapper_error_handler,
            (void *)env);
    }

    wrapper_impl->current_event = -1;

    axis2_libxml2_reader_wrapper_init_map(wrapper_impl);

    wrapper_impl->parser.ops = &axiom_xml_reader_ops_var;
    return &(wrapper_impl->parser);
}



int AXIS2_CALL
axis2_libxml2_reader_wrapper_next(axiom_xml_reader_t *parser,
    const axutil_env_t *env)
{
    int ret_val = 0;
    int node = 2;
    int empty_check = 0;
    axis2_libxml2_reader_wrapper_impl_t *parser_impl;
    AXIS2_ENV_CHECK(env, -1);
    parser_impl = AXIS2_INTF_TO_IMPL(parser);
    ret_val = xmlTextReaderRead(parser_impl->reader);
    if (ret_val == 0)
    {
        AXIS2_LOG_DEBUG(env->log, AXIS2_LOG_SI, "xml stream is over ");
    }
    if (ret_val == -1)
    {
        AXIS2_LOG_ERROR(env->log, AXIS2_LOG_SI, 
            " error occured in reading xml stream ");
        return -1;
    }

    if (ret_val == 1)
    {
        node = xmlTextReaderNodeType(parser_impl->reader);
        parser_impl->current_event = parser_impl->event_map[node];
        parser_impl->current_attribute_count = 0;
        parser_impl->current_namespace_count = 0;

        if (node == XML_READER_TYPE_ELEMENT)
        {
            empty_check = xmlTextReaderIsEmptyElement(parser_impl->reader);
            axis2_libxml2_reader_wrapper_fill_maps(parser , env);
        }
        if (empty_check == 1)
        {
            parser_impl->current_event =  AXIOM_XML_READER_EMPTY_ELEMENT;
            return AXIOM_XML_READER_EMPTY_ELEMENT;
        }
        return parser_impl->event_map[node];
    }
    else
    {
        return -1;
    }
}

void AXIS2_CALL
axis2_libxml2_reader_wrapper_free(axiom_xml_reader_t *parser,
    const axutil_env_t *env)
{
    AXIS2_ENV_CHECK(env, AXIS2_FAILURE);
    if (AXIS2_INTF_TO_IMPL(parser)->ctx)
    {
        AXIS2_FREE(env->allocator, AXIS2_INTF_TO_IMPL(parser)->ctx);
    }

    if (AXIS2_INTF_TO_IMPL(parser)->reader)
    {
        xmlTextReaderClose(AXIS2_INTF_TO_IMPL(parser)->reader);
        xmlFreeTextReader(AXIS2_INTF_TO_IMPL(parser)->reader);
    }
    AXIS2_FREE(env->allocator, AXIS2_INTF_TO_IMPL(parser));
    return;
}

int AXIS2_CALL
axis2_libxml2_reader_wrapper_get_attribute_count(axiom_xml_reader_t *parser, 
    const axutil_env_t *env)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl = NULL;
    AXIS2_ENV_CHECK(env, AXIS2_FAILURE);
    parser_impl = AXIS2_INTF_TO_IMPL(parser);
    if (parser_impl->current_event == AXIOM_XML_READER_START_ELEMENT ||
        parser_impl->current_event == AXIOM_XML_READER_EMPTY_ELEMENT)
    {
        return parser_impl->current_attribute_count;
    }
    else
    {
        return 0;
    }
}

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_attribute_name_by_number(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    int i)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl;
    AXIS2_ENV_CHECK(env, NULL);
    parser_impl = AXIS2_INTF_TO_IMPL(parser);

    if (parser_impl->current_attribute_count > 0 &&
        parser_impl->current_attribute_count >= i)
    {
        int ret = xmlTextReaderMoveToAttributeNo(parser_impl->reader,
            parser_impl->attribute_map[i]);
        if (ret == 1)
        {
            return (axis2_char_t*)xmlTextReaderLocalName(parser_impl->reader);
        }
        else
        {
            return NULL;
        }
    }
    return NULL;
}

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_attribute_prefix_by_number(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    int i)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl = NULL;
    AXIS2_ENV_CHECK(env, NULL);
    parser_impl = AXIS2_INTF_TO_IMPL(parser);

    if (parser_impl->current_attribute_count > 0 &&
        parser_impl->current_attribute_count >= i)
    {
        int ret = xmlTextReaderMoveToAttributeNo(parser_impl->reader,
            parser_impl->attribute_map[i]);
        if (ret == 1)
        {
            return (axis2_char_t*)xmlTextReaderPrefix(parser_impl->reader);
        }
        else
        {
            return NULL;
        }
    }
    return NULL;
}


axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_attribute_value_by_number(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    int i)
{

    axis2_libxml2_reader_wrapper_impl_t *parser_impl;
    AXIS2_ENV_CHECK(env, NULL);
    parser_impl = AXIS2_INTF_TO_IMPL(parser);

    if (parser_impl->current_attribute_count > 0 &&
        parser_impl->current_attribute_count >= i)
    {
        int ret = xmlTextReaderMoveToAttributeNo(parser_impl->reader,
            parser_impl->attribute_map[i]);
        if (ret == 1)
        {
            return (axis2_char_t*)xmlTextReaderValue(parser_impl->reader);
        }
        else
        {
            return NULL;
        }
    }
    return NULL;
}

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_attribute_namespace_by_number(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    int i)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl;
    AXIS2_ENV_CHECK(env, NULL);
    parser_impl = AXIS2_INTF_TO_IMPL(parser);

    if (parser_impl->current_attribute_count > 0 &&
        parser_impl->current_attribute_count >= i)
    {
        int ret = xmlTextReaderMoveToAttributeNo(parser_impl->reader,
            parser_impl->attribute_map[i]);

        if (ret == 1)
        {
            return (axis2_char_t*)xmlTextReaderNamespaceUri(parser_impl->reader);
        }
        else
        {
            return NULL;
        }
    }
    return NULL;
}

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_value(axiom_xml_reader_t *parser,
    const axutil_env_t *env)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl = NULL;

    AXIS2_ENV_CHECK(env, NULL);
    parser_impl = AXIS2_INTF_TO_IMPL(parser);
    return (axis2_char_t*)xmlTextReaderValue(parser_impl->reader);

}

int AXIS2_CALL
axis2_libxml2_reader_wrapper_get_namespace_count(axiom_xml_reader_t *parser,
    const axutil_env_t *env)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl = NULL;
    AXIS2_ENV_CHECK(env, AXIS2_FAILURE);
    parser_impl = AXIS2_INTF_TO_IMPL(parser);
    if (parser_impl->current_event == AXIOM_XML_READER_START_ELEMENT ||
        parser_impl->current_event == AXIOM_XML_READER_EMPTY_ELEMENT)
    {
        return parser_impl->current_namespace_count;
    }
    else
    {
        return 0;
    }
}

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_namespace_uri_by_number(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    int i)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl = NULL;
    AXIS2_ENV_CHECK(env, NULL);
    parser_impl = AXIS2_INTF_TO_IMPL(parser);

    if (parser_impl->current_namespace_count > 0 &&
        parser_impl->current_namespace_count >= i)
    {

        int ret = xmlTextReaderMoveToAttributeNo(parser_impl->reader,
            parser_impl->namespace_map[i]);
        if (ret == 1)
        {
            return (axis2_char_t*)xmlTextReaderValue(parser_impl->reader);
        }
        else
            return NULL;
    }
    return NULL;
}

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_namespace_prefix_by_number(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    int i)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl = NULL;
    AXIS2_ENV_CHECK(env, NULL);
    parser_impl = AXIS2_INTF_TO_IMPL(parser);

    if (parser_impl->current_namespace_count > 0 &&
        parser_impl->current_namespace_count >= i)
    {
        int ret = xmlTextReaderMoveToAttributeNo(parser_impl->reader,
            parser_impl->namespace_map[i]);

        if (ret == 1)
        {
            return (axis2_char_t*)xmlTextReaderLocalName(parser_impl->reader);
        }
        else
        {
            return NULL;
        }
    }
    return NULL;
}

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_prefix(axiom_xml_reader_t *parser,
    const axutil_env_t *env)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl = NULL;
    parser_impl = AXIS2_INTF_TO_IMPL(parser);
    xmlTextReaderMoveToElement(parser_impl->reader);
    return (axis2_char_t*)xmlTextReaderPrefix(parser_impl->reader);
}

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_name(axiom_xml_reader_t *parser,
    const axutil_env_t *env)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl = NULL;
    parser_impl = AXIS2_INTF_TO_IMPL(parser);
    xmlTextReaderMoveToElement(parser_impl->reader);
    return (axis2_char_t*)xmlTextReaderLocalName(parser_impl->reader);
}

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_pi_target(axiom_xml_reader_t *parser,
    const axutil_env_t *env)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl = NULL;
    parser_impl = AXIS2_INTF_TO_IMPL(parser);
    if (parser_impl->current_event ==  AXIOM_XML_READER_PROCESSING_INSTRUCTION)
    {
        return (axis2_char_t*)xmlTextReaderLocalName(parser_impl->reader);
    }
    else
    {
        return NULL;
    }
}

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_dtd(axiom_xml_reader_t *parser,
    const axutil_env_t *env)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl = NULL;
    parser_impl = AXIS2_INTF_TO_IMPL(parser);
    if (parser_impl->current_event ==  AXIOM_XML_READER_DOCUMENT_TYPE)
    {
        return (axis2_char_t*)xmlTextReaderLocalName(parser_impl->reader);
    }
    else
    {
        return NULL;
    }
}

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_pi_data(axiom_xml_reader_t *parser,
    const axutil_env_t *env)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl = NULL;
    parser_impl = AXIS2_INTF_TO_IMPL(parser);
    if (parser_impl->current_event == AXIOM_XML_READER_PROCESSING_INSTRUCTION)
    {
        return (axis2_char_t*)xmlTextReaderValue(parser_impl->reader);
    }
    else
    {
        return NULL;
    }
}

void AXIS2_CALL
axis2_libxml2_reader_wrapper_xml_free(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    void *data)
{
    AXIS2_ENV_CHECK(env, void);
    if(data)
        xmlFree(data);
    return;
}

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_char_set_encoding(axiom_xml_reader_t *parser,
    const axutil_env_t *env)
{
    axis2_libxml2_reader_wrapper_impl_t *reader_impl = NULL;
    reader_impl = AXIS2_INTF_TO_IMPL(parser);
    return (axis2_char_t*)xmlTextReaderConstEncoding(reader_impl->reader);
}

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_namespace_uri(axiom_xml_reader_t *parser,
    const axutil_env_t *env)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl = NULL;
    parser_impl = AXIS2_INTF_TO_IMPL(parser);
    return (axis2_char_t *)xmlTextReaderNamespaceUri(parser_impl->reader);
}

axis2_char_t *AXIS2_CALL
axis2_libxml2_reader_wrapper_get_namespace_uri_by_prefix(axiom_xml_reader_t *parser,
    const axutil_env_t *env,
    axis2_char_t *prefix)
{
    axis2_libxml2_reader_wrapper_impl_t *parser_impl = NULL;
    parser_impl = AXIS2_INTF_TO_IMPL(parser);
    if (!prefix || axutil_strcmp(prefix, "") == 0)
    {
        return NULL;
    }
    return (axis2_char_t *)xmlTextReaderLookupNamespace(parser_impl->reader, (const xmlChar *)prefix);
}

axis2_status_t 
axis2_libxml2_reader_wrapper_fill_maps(axiom_xml_reader_t *parser,
    const axutil_env_t *env)
{
    int libxml2_attribute_count = 0;
    int attr_count = 0;
    int ns_count = 0;
    int i = 0;
    char *q_name = NULL;
    axis2_libxml2_reader_wrapper_impl_t *parser_impl = NULL;

    AXIS2_ENV_CHECK(env, AXIS2_FAILURE);
    parser_impl = AXIS2_INTF_TO_IMPL(parser);

    libxml2_attribute_count = xmlTextReaderAttributeCount(parser_impl->reader);
    if (libxml2_attribute_count == 0)
    {
        return AXIS2_SUCCESS;
    }

    for (i = 0;i < AXIS2_ATTR_NS_MAX ;i++)
    {
        parser_impl->namespace_map[i] = -1;
        parser_impl->attribute_map[i] = -1;
    }

    for (i = 0; i < libxml2_attribute_count ; i++)
    {
        xmlTextReaderMoveToAttributeNo(parser_impl->reader, i);
        q_name = (char *) xmlTextReaderName(parser_impl->reader);
        if (q_name)
        {
            if ((strcmp(q_name, "xmlns") == 0) || (strncmp(q_name, "xmlns:", 6) == 0))
            {
                /* found a namespace */
                ns_count++;
                parser_impl->namespace_map[ns_count] = i;
            }
            else
            {
                /* found an attribute */
                attr_count++;
                parser_impl->attribute_map[attr_count] = i;
            }

            xmlFree(q_name);
            q_name = NULL;
        }

        parser_impl->current_attribute_count = attr_count;
        parser_impl->current_namespace_count = ns_count;
    }
    return AXIS2_SUCCESS;
}

static int
axis2_libxml2_reader_wrapper_read_input_callback(void *ctx,
    char *buffer,
    int size)
{
    return ((axis2_libxml2_reader_wrapper_impl_t*)ctx)->read_input_callback(buffer,
        size, ((axis2_libxml2_reader_wrapper_impl_t*)ctx)->ctx);
}

void
axis2_libxml2_reader_wrapper_error_handler(void *arg,
    const char *msg,
    int severities,
    void *locator_ptr)
{
    const axutil_env_t *env = NULL;
    env = (const axutil_env_t*)arg;

    switch (severities)
    {
        case XML_PARSER_SEVERITY_VALIDITY_WARNING :
        {
            AXIS2_LOG_ERROR(env->log, AXIS2_LOG_SI, "%s VALIDITY WARNTING", msg);
        }
        break;
        case XML_PARSER_SEVERITY_VALIDITY_ERROR:
        {
            AXIS2_LOG_ERROR(env->log, AXIS2_LOG_SI, "%s -- VALIDITY ERROR", msg);
        }
        break;
        case XML_PARSER_SEVERITY_WARNING:
        {
            AXIS2_LOG_ERROR(env->log, AXIS2_LOG_SI, "%s -- VALIDITY ERROR", msg);
        }
        break;
        case XML_PARSER_SEVERITY_ERROR:
        {
            AXIS2_LOG_ERROR(env->log, AXIS2_LOG_SI, "%s -- SEVERITY_ERROR", msg);
        }
        break;
        default:
            break;
    }
}

static int
axis2_libxml2_reader_wrapper_close_input_callback(void *ctx)
{
    return ((axis2_libxml2_reader_wrapper_impl_t*)ctx)->close_input_callback(((axis2_libxml2_reader_wrapper_impl_t*)ctx)->ctx);
}