
/*
* 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.
*/

#ifndef AXIOM_ATTRIBUTE_H
#define AXIOM_ATTRIBUTE_H

/**
* @file axiom_attribute.h
* @brief om attribute struct represents an xml attribute
*/
#include <axutil_env.h>
#include <axutil_qname.h>
#include <axiom_namespace.h>
#include <axiom_output.h>

#ifdef __cplusplus
extern "C"
{
#endif

    /**
     * @defgroup axiom_attribute attribute
     * @ingroup axiom_om
     * @{
     */

    typedef struct axiom_attribute axiom_attribute_t;

    /**
      * creates an om_attribute struct 
      *
      * @param env Environment. MUST NOT be NULL
      * @param localname localname of the attribute, should not be a null value.
      * @param value normalized attribute value. cannot be NULL
      * @param ns namespace, if any, of the attribute. Optional, can be NULL om_attribute wont free the ns
      *
      * @return a pointer to newly created attribute struct, returns NULL on error with 
      *           error code set in environment's error. 
      */
    AXIS2_EXTERN axiom_attribute_t *AXIS2_CALL
    axiom_attribute_create(
        const axutil_env_t * env,
        const axis2_char_t * localname,
        const axis2_char_t * value,
        axiom_namespace_t * ns);

    /**
      * Free om attribute passed as void pointer. This will be
      * cast into appropriate type and then pass the cast object
      * into the om_attribute structure's free method
      *
      * @param  om_attribute pointer to attribute struct to be freed
      * @param  env Environment. MUST NOT be NULL
      */
   
    AXIS2_EXTERN void AXIS2_CALL
    axiom_attribute_free_void_arg(
        void *om_attribute,
        const axutil_env_t * env);

    /**
      * Free an axiom_attribute struct
      *
      * @param  om_attribute pointer to attribute struct to be freed
      * @param  env Environment. MUST NOT be NULL
      */

    AXIS2_EXTERN void AXIS2_CALL
    axiom_attribute_free(
        struct axiom_attribute *om_attribute,
        const axutil_env_t * env);

    /**
      * Creates and returns a qname struct for this attribute
      *
      * @param om_attribute pointer to attribute struct 
      *        for which the qname is to be returned
      * @param env Environment. MUST NOT be NULL
      *
      * @return returns qname for given attribute.NULL on error 
      */

    AXIS2_EXTERN axutil_qname_t *AXIS2_CALL
    axiom_attribute_get_qname(
        struct axiom_attribute *om_attribute,
        const axutil_env_t * env);

    /**
      * Serialize op
      *
      * @param om_attribute pointer to attribute struct to be serialized
      * @param env Environment. MUST NOT be NULL,
      * @param om_output AXIOM output handler to be used in serializing
      *
      * @return satus of the op. AXIS2_SUCCESS on success else AXIS2_FAILURE.
      */

    AXIS2_EXTERN int AXIS2_CALL
    axiom_attribute_serialize(
        struct axiom_attribute *om_attribute,
        const axutil_env_t * env,
        axiom_output_t * om_output);

    /** Returns the localname of this attribute
     *
      * @param om_attribute pointer to attribute struct 
      * @param env environment. MUST NOT not be NULL.
      *
      * @return localname returns NULL on error.
      */
    AXIS2_EXTERN axis2_char_t *AXIS2_CALL
    axiom_attribute_get_localname(
        struct axiom_attribute *om_attribute,
        const axutil_env_t * env);

    /**
     * returns value of this attribute 
     *
     *@param om_attribute pointer to om_attribute struct 
     *@param env environment N not be null
     *
     *@return value , null on error
     */
    AXIS2_EXTERN axis2_char_t *AXIS2_CALL
    axiom_attribute_get_value(
        struct axiom_attribute *om_attribute,
        const axutil_env_t * env);

    /**
     * returns namespace of this attribute 
     *
     *@param om_attribute
     *@param env environment MUST NOT be NULL
     *
     *@return a pointer to om_namespace struct , returns NULL on error.
     */
    AXIS2_EXTERN axiom_namespace_t *AXIS2_CALL
    axiom_attribute_get_namespace(
        struct axiom_attribute *om_attribute,
        const axutil_env_t * env);

    /** sets the localname of the attribute
     *
     *@param om_attribute pointer to om attribute struct. 
     *@param env environment, MUST NOT be null.
     *@param localname localname that should be set for this attribute
     *
     *@return status code AXIS2_SUCCESS on success and AXIS2_FAILURE on error.
     */
    AXIS2_EXTERN axis2_status_t AXIS2_CALL
    axiom_attribute_set_localname(
        struct axiom_attribute *om_attribute,
        const axutil_env_t * env,
        const axis2_char_t * localname);

    /** set the attribute value
     *
     *@param om_attribute a pointer to om_attribute struct.
     *@param env environment, MUST NOT be NULL.
     *@param value value that should be set for this attribute
     *
     *@return status code, AXIS2_SUCCESS on success and AXIS2_FAILURE on error.
     */

    AXIS2_EXTERN axis2_status_t AXIS2_CALL
    axiom_attribute_set_value(
        struct axiom_attribute *om_attribute,
        const axutil_env_t * env,
        const axis2_char_t * value);

    /** set namespace of the attribute
     *
     *@param om_attribute a pointer to om_attribute struct  
     *@param env environment, MUST NOT be NULL.
     *@param om_namespace a pointer to om_namespace struct that should be set 
     *                    for this attribute 
     *
     *@return status code, AXIS2_SUCCESS on success and AXIS2_FAILURE on error.
     */
    AXIS2_EXTERN axis2_status_t AXIS2_CALL
    axiom_attribute_set_namespace(
        struct axiom_attribute *om_attribute,
        const axutil_env_t * env,
        axiom_namespace_t * om_namespace);

    /**
     * clones an om attribute
     *
     * @param om_attibute 
     * @param env environment
     *
     * @returns pointer to cloned om attribute struct on success NULL otherwise
     */
    AXIS2_EXTERN struct axiom_attribute *AXIS2_CALL
                axiom_attribute_clone(
                    struct axiom_attribute *om_attribute,
                    const axutil_env_t * env);

    /** Increment the reference counter.
     *
     * @param om_attribute a pointer to om_attribute struct  
     * @param env environment, MUST NOT be NULL.
     *
     * @return status code, AXIS2_SUCCESS on success and AXIS2_FAILURE on error.
     */
    AXIS2_EXTERN axis2_status_t AXIS2_CALL
    axiom_attribute_increment_ref(
        struct axiom_attribute *om_attribute,
        const axutil_env_t * env);

    /** Create OM attribute 
     *
     * @param om_attribute a pointer to om_attribute struct  
     * @param env environment, MUST NOT be NULL.
     *
     * @return status code, AXIS2_SUCCESS on success and AXIS2_FAILURE on error.
     */
    AXIS2_EXTERN axiom_attribute_t *AXIS2_CALL
    axiom_attribute_create_str(
        const axutil_env_t * env,
        axutil_string_t * localname,
        axutil_string_t * value,
        axiom_namespace_t * ns);

    /**  Get the localname as a string
     *
     * @param om_attribute a pointer to om_attribute struct  
     * @param env environment, MUST NOT be NULL.
     *
     * @return status code, AXIS2_SUCCESS on success and AXIS2_FAILURE on error.
     */
    AXIS2_EXTERN axutil_string_t *AXIS2_CALL
    axiom_attribute_get_localname_str(
        axiom_attribute_t * attribute,
        const axutil_env_t * env);

    /**  Get the value as a string
     *
     * @param om_attribute a pointer to om_attribute struct  
     * @param env environment, MUST NOT be NULL.
     *
     * @return status code, AXIS2_SUCCESS on success and AXIS2_FAILURE on error.
     */
    AXIS2_EXTERN axutil_string_t *AXIS2_CALL
    axiom_attribute_get_value_str(
        axiom_attribute_t * attribute,
        const axutil_env_t * env);

    /**  Set the localname of the attribute
     *
     * @param om_attribute a pointer to om_attribute struct  
     * @param env environment, MUST NOT be NULL.
     *
     * @return status code, AXIS2_SUCCESS on success and AXIS2_FAILURE on error.
     */
    AXIS2_EXTERN axis2_status_t AXIS2_CALL
    axiom_attribute_set_localname_str(
        axiom_attribute_t * attribute,
        const axutil_env_t * env,
        axutil_string_t * localname);

    /**  Set the value of the attribute
     *
     * @param om_attribute a pointer to om_attribute struct  
     * @param env environment, MUST NOT be NULL.
     *
     * @return status code, AXIS2_SUCCESS on success and AXIS2_FAILURE on error.
     */
    AXIS2_EXTERN axis2_status_t AXIS2_CALL
    axiom_attribute_set_value_str(
        axiom_attribute_t * attribute,
        const axutil_env_t * env,
        axutil_string_t * value);

    /** @} */

#ifdef __cplusplus
}
#endif

#endif                          /* AXIOM_ATTRIBUTE_H */