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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2008, Eliel C. Sardanons (LU1ALY) <eliels@gmail.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

#ifndef _ASTERISK_XML_H
#define _ASTERISK_XML_H

/*! \file
 * \brief Asterisk XML abstraction layer
 */

struct ast_xml_node;
struct ast_xml_doc;

/*!
 * \brief Initialize the XML library implementation.
 *         This function is used to setup everything needed
 *         to start working with the xml implementation.
 * \retval 0 On success.
 * \retval 1 On error.
 */
int ast_xml_init(void);

/*!
 * \brief Cleanup library allocated global data.
 * \retval 0 On success.
 * \retval 1 On error.
 */
int ast_xml_finish(void);

/*!
 * \brief Open an XML document.
 * \param filename Document path.
 * \retval NULL on error.
 * \retval The ast_xml_doc reference to the open document.
 */
struct ast_xml_doc *ast_xml_open(char *filename);

/*!
 * \brief Create a XML document.
 * \retval NULL on error.
 * \retval non-NULL The allocated document structure.
 */
struct ast_xml_doc *ast_xml_new(void);

/*!
 * \brief Create a XML node.
 * \param name The name of the node to be created.
 * \retval NULL on error.
 * \retval non-NULL The allocated node structe.
 */
struct ast_xml_node *ast_xml_new_node(const char *name);

/*!
 * \brief Add a child node inside a passed parent node.
 * \param parent The pointer of the parent node.
 * \param child_name The name of the child node to add.
 * \retval NULL on error.
 * \retval non-NULL The created child node pointer.
 */
struct ast_xml_node *ast_xml_new_child(struct ast_xml_node *parent, const char *child_name);

/*!
 * \brief Add a child node, to a specified parent node.
 * \param parent Where to add the child node.
 * \param child The child node to add.
 * \retval NULL on error.
 * \retval non-NULL The add child node on success.
 */
struct ast_xml_node *ast_xml_add_child(struct ast_xml_node *parent, struct ast_xml_node *child);

/*!
 * \brief Close an already open document and free the used
 *        structure.
 * \retval doc The document reference.
 */
void ast_xml_close(struct ast_xml_doc *doc);

/*! \brief Open an XML document that resides in memory.
 * \param buffer The address where the document is stored
 * \param size The number of bytes in the document
 * \retval NULL on error.
 * \retval The ast_xml_doc reference to the open document.
 */
struct ast_xml_doc *ast_xml_read_memory(char *buffer, size_t size);

/*!
 * \brief Specify the root node of a XML document.
 * \param doc The document pointer.
 * \param node A pointer to the node we want to set as root node.
 */
void ast_xml_set_root(struct ast_xml_doc *doc, struct ast_xml_node *node);

/*!
 * \brief Get the document root node.
 * \param doc Document reference
 * \retval NULL on error
 * \retval The root node on success.
 */
struct ast_xml_node *ast_xml_get_root(struct ast_xml_doc *doc);

/*!
 * \brief Free node
 * \param node Node to be released.
 */
void ast_xml_free_node(struct ast_xml_node *node);

/*!
 * \brief Free an attribute returned by ast_xml_get_attribute()
 * \param attribute pointer to be freed.
 */
void ast_xml_free_attr(const char *attribute);

/*!
 * \brief Get the document based on a node.
 * \param node A node that is part of the dom.
 * \returns The dom pointer where this node resides.
 */
struct ast_xml_doc *ast_xml_get_doc(struct ast_xml_node *node);

/*!
 * \brief Free a content element that was returned by ast_xml_get_text()
 * \param text text to be freed.
 */
void ast_xml_free_text(const char *text);

/*!
 * \brief Get a node attribute by name
 * \param node Node where to search the attribute.
 * \param attrname Attribute name.
 * \retval NULL on error
 * \retval The attribute value on success.
 */
const char *ast_xml_get_attribute(struct ast_xml_node *node, const char *attrname);

/*!
 * \brief Set an attribute to a node.
 * \param node In which node we want to insert the attribute.
 * \param name The attribute name.
 * \param value The attribute value.
 * \retval 0 on success.
 * \retval -1 on error.
 */
int ast_xml_set_attribute(struct ast_xml_node *node, const char *name, const char *value);

/*!
 * \brief Find a node element by name.
 * \param root_node This is the node starting point.
 * \param name Node name to find.
 * \param attrname attribute name to match (if NULL it won't be matched).
 * \param attrvalue attribute value to match (if NULL it won't be matched).
 * \retval NULL if not found.
 * \retval The node on success.
 */
struct ast_xml_node *ast_xml_find_element(struct ast_xml_node *root_node, const char *name, const char *attrname, const char *attrvalue);
struct ast_xml_ns *ast_xml_find_namespace(struct ast_xml_doc *doc, struct ast_xml_node *node, const char *ns_name);
const char *ast_xml_get_ns_href(struct ast_xml_ns *ns);

/*!
 * \brief Get an element content string.
 * \param node Node from where to get the string.
 * \retval NULL on error.
 * \retval The text content of node.
 */
const char *ast_xml_get_text(struct ast_xml_node *node);

/*!
 * \brief Set an element content string.
 * \param node Node from where to set the content string.
 * \param content The text to insert in the node.
 */
void ast_xml_set_text(struct ast_xml_node *node, const char *content);

/*!
 * \brief Get the name of a node. */
const char *ast_xml_node_get_name(struct ast_xml_node *node);

/*!
 * \brief Get the node's children. */
struct ast_xml_node *ast_xml_node_get_children(struct ast_xml_node *node);

/*!
 * \brief Get the next node in the same level. */
struct ast_xml_node *ast_xml_node_get_next(struct ast_xml_node *node);

/*!
 * \brief Get the previous node in the same leve. */
struct ast_xml_node *ast_xml_node_get_prev(struct ast_xml_node *node);

/*!
 * \brief Get the parent of a specified node. */
struct ast_xml_node *ast_xml_node_get_parent(struct ast_xml_node *node);

/*!
 * \brief Dump the specified document to a file. */
int ast_xml_doc_dump_file(FILE *output, struct ast_xml_doc *doc);

/* Features using ast_xml_ */
#ifdef HAVE_LIBXML2
#define AST_XML_DOCS
#endif

#endif /* _ASTERISK_XML_H */