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606 lines
18 KiB
C++
606 lines
18 KiB
C++
/* -------------------------------------------------------------------------- */
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/* Copyright 2002-2016, OpenNebula Project, OpenNebula Systems */
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/* */
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/* Licensed under the Apache License, Version 2.0 (the "License"); you may */
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/* not use this file except in compliance with the License. You may obtain */
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/* a copy of the License at */
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/* */
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/* http://www.apache.org/licenses/LICENSE-2.0 */
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/* */
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/* Unless required by applicable law or agreed to in writing, software */
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/* distributed under the License is distributed on an "AS IS" BASIS, */
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/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
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/* See the License for the specific language governing permissions and */
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/* limitations under the License. */
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/* -------------------------------------------------------------------------- */
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#ifndef TEMPLATE_H_
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#define TEMPLATE_H_
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#include <iostream>
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#include <map>
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#include <vector>
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#include <libxml/tree.h>
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#include <libxml/parser.h>
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#include "Attribute.h"
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using namespace std;
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/**
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* Base class for file templates. A template is a file (or a string for the
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* matter of fact) containing a set of attribute definitions of the form:
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* NAME = VALUE
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* where NAME is a string representing the name of the attribute, and VALUE can
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* be a single string or a vector value (array of string pairs). The file can
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* contain several attributes with the same name.
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*/
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class Template
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{
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public:
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Template(bool _replace_mode = false,
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const char _separator = '=',
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const char * _xml_root = "TEMPLATE"):
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replace_mode(_replace_mode),
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separator(_separator),
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xml_root(_xml_root){};
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Template(const Template& t)
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{
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multimap<string,Attribute *>::const_iterator it;
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replace_mode = t.replace_mode;
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separator = t.separator;
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xml_root = t.xml_root;
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attributes.clear();
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for (it = t.attributes.begin() ; it != t.attributes.end() ; it++)
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{
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attributes.insert(make_pair(it->first,(it->second)->clone()));
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}
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}
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Template& operator=(const Template& t)
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{
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multimap<string,Attribute *>::const_iterator it;
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if (this != &t)
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{
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replace_mode = t.replace_mode;
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separator = t.separator;
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xml_root = t.xml_root;
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attributes.clear();
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for (it = t.attributes.begin() ; it != t.attributes.end() ; it++)
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{
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attributes.insert(make_pair(it->first,(it->second)->clone()));
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}
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}
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return *this;
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}
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/**
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* The class destructor frees all the attributes conforming the template
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*/
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virtual ~Template();
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/* ---------------------------------------------------------------------- */
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/* Functions to create a Template parsing a file, stream in txt or XML */
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/* ---------------------------------------------------------------------- */
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/**
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* Parse a string representing the template, each attribute is inserted
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* in the template class.
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* @param parse_str string with template attributes
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* @param error_msg error string, must be freed by the calling function.
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* This string is null if no error occurred.
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* @return 0 on success.
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*/
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int parse(const string &parse_str, char **error_msg);
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/**
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* Parse a template file.
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* @param filename of the template file
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* @param error_msg error string, must be freed by the calling function.
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* This string is null if no error occurred.
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* @return 0 on success.
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*/
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int parse(const char * filename, char **error_msg);
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/**
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* Parse a string representing the template, automatically detecting if
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* it is the default syntax, or an XML template. Each attribute is inserted
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* in the template class.
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* @param parse_str string with template attributes, or XML template
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* @param error_msg error string, must be freed by the calling function.
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* This string is null if no error occurred.
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* @return 0 on success.
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*/
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int parse_str_or_xml(const string &parse_str, string& error_msg);
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/**
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* Rebuilds the template from a xml formatted string
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* @param xml_str The xml-formatted string
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*
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* @return 0 on success, -1 otherwise
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*/
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int from_xml(const string &xml_str);
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/**
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* Rebuilds the object from an xml node
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* @param node The xml node pointer
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*
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* @return 0 on success, -1 otherwise
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*/
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int from_xml_node(const xmlNodePtr node);
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/**
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* Writes the Template into a output stream in txt format
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*/
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friend ostream& operator<<(ostream& os, const Template& t);
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/* ---------------------------------------------------------------------- */
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/* Functions to render a Template in a str, or xml */
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/* ---------------------------------------------------------------------- */
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/**
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* Marshall a template. This function generates a single string with the
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* template attributes ("VAR=VAL<delim>...").
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* @param str_tempalte string that hold the template
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* @param delim to separate attributes
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*/
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void marshall(string &str, const char delim='\n');
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/**
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* Writes the template in a simple xml string:
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* <template>
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* <single>value</single>
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* <vector>
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* <attr>value</attr>
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* ...
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* </vector>
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* ...
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* </template>
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* The name of the root element is set when the Template object is created
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* @param xml string that hold the xml template representation
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* @return a reference to the generated string
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*/
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string& to_xml(string& xml) const;
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/**
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* Writes the template in a plain text string
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* @param str string that hold the template representation
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* @return a reference to the generated string
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*/
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string& to_str(string& str) const;
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/* ---------------------------------------------------------------------- */
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/* Functions to add, remove and change attributes from a Template */
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/* ---------------------------------------------------------------------- */
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/**
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* Clears all the attributes from the template
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*/
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void clear();
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/**
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* Sets a new attribute, the attribute MUST BE ALLOCATED IN THE HEAP, and
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* will be freed when the template destructor is called.
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* @param attr pointer to the attribute
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*/
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virtual void set(Attribute * attr);
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virtual void set(vector<SingleAttribute *>& values)
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{
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_set<SingleAttribute>(values);
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}
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virtual void set(vector<VectorAttribute *>& values)
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{
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_set<VectorAttribute>(values);
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}
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/**
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* Adds a new attribute to the template (replacing it if already defined)
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* @param name of the new attribute
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* @param value of the new attribute
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* @return 0 on success
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*/
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template<typename T>
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int replace(const string& name, const T& value)
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{
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std::ostringstream oss;
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oss << value;
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return replace(name, oss.str());
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}
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int replace(const string& name, const string& value);
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int replace(const string& name, const bool& value);
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/**
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* Adds a new single attribute to the template. It will replace an existing
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* one if replace_mode was set to true
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* @param name of the attribute
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* @param value of the attribute
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*/
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template<typename T>
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void add(const string& name, const T& value)
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{
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std::ostringstream oss;
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oss << value;
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set(new SingleAttribute(name, oss.str()));
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}
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void add(const string& name, const string& value)
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{
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set(new SingleAttribute(name, value));
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}
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/**
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* Removes an attribute from the template. The attributes are returned. The
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* attributes MUST be freed by the calling funtion
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* @param name of the attribute
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* @param values a vector containing a pointer to the attributes
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* @return the number of attributes removed
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*/
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template<typename T>
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int remove(const string& name, vector<T *>& values)
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{
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pair<multimap<string, Attribute *>::iterator,
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multimap<string, Attribute *>::iterator> index;
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multimap<string, Attribute *>::iterator i;
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int j;
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index = attributes.equal_range(name);
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for ( i = index.first,j=0 ; i != index.second ; i++,j++ )
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{
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values.push_back(static_cast<T *>(i->second));
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}
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attributes.erase(index.first, index.second);
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return j;
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}
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/**
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* Removes an attribute from the template, but it DOES NOT free the
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* attribute.
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* @param att Attribute to remove. It will be deleted
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* @return pointer to the removed attribute or 0 if non attribute was
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* removed
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*/
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virtual Attribute * remove(Attribute * att);
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/**
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* Removes an attribute from the template, and frees the attributes.
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* @param name of the attribute
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* @return the number of attributes removed
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*/
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virtual int erase(const string& name);
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/* ---------------------------------------------------------------------- */
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/* Functions get attributes from a template */
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/* ---------------------------------------------------------------------- */
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/**
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* Gets the all the attributes of the given name and stores a reference
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* to them in a vector. If the selected attribute does not match the
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* requested type it will not be included
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* @param name the attribute name.
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* @param values vector with the values
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*
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* @return the number of elements in the vector
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*/
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inline virtual int get(const string& n, vector<const VectorAttribute*>& v) const
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{
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return __get<VectorAttribute>(n, v);
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}
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inline virtual int get( const string& n, vector<VectorAttribute*>& v)
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{
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return __get<VectorAttribute>(n, v);
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}
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inline virtual int get(const string& n, vector<const SingleAttribute*>& s) const
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{
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return __get<SingleAttribute>(n, s);
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}
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inline virtual int get( const string& n, vector<SingleAttribute*>& s)
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{
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return __get<SingleAttribute>(n, s);
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}
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/**
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* Gets the first Attribute of the specified type with the given name.
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* Const and non-const versions of this method is provided
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* @param name the attribute name.
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* @return true first attribute or 0 if not found or wrong type
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*/
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inline const VectorAttribute * get(const string& name) const
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{
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return __get<VectorAttribute>(name);
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}
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inline VectorAttribute * get(const string& name)
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{
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return __get<VectorAttribute>(name);
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}
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/**
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* Gets the value of a SingleAttribute with the given name and converts
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* it to the target value format
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* @param name the attribute name.
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* @param value the attribute value
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*
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* @return true if a SingleAttribute was found and it stores a valid
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* value, false otherwise.
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*/
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template<typename T>
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bool get(const string& name, T& value) const
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{
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const SingleAttribute * s = __get<SingleAttribute>(name);
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value = 0;
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if ( s == 0 )
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{
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return false;
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}
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istringstream iss(s->value());
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iss >> value;
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if (iss.fail() || !iss.eof())
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{
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return false;
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}
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return true;
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}
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virtual bool get(const string& name, bool& value) const;
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virtual bool get(const string& name, string& value) const;
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/**
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* Trims the trailing spaces in the attribute
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* @param name of the attribute
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* @return True if the attribute was found and trimmed
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*/
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virtual bool trim(const string& name);
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/**
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* Trims the trailing spaces in the NAME attribute
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* @return True if the attribute was found and trimmed
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*/
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inline virtual bool trim_name()
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{
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return trim("NAME");
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};
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/**
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* Merges another Template, adding the new attributes and
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* replacing the existing ones
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*
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* @param from_tmpl the template to be merged
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*/
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void merge(const Template * from_tmpl);
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/**
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* Deletes all restricted attributes
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*/
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virtual void remove_restricted();
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/**
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* Deletes all the attributes, except the restricted ones
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*/
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virtual void remove_all_except_restricted();
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/**
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* @return true if the template defines one or more restricted attributes
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*/
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virtual bool has_restricted();
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protected:
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/**
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* The template attributes
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*/
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multimap<string,Attribute *> attributes;
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/**
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* Builds a SingleAttribute from the given node
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* @param node The xml element to build the attribute from.
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*
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* @return the attribute, or 0 if the node doesn't contain a single att.
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*/
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Attribute* single_xml_att(const xmlNode * node);
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/**
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* Builds a VectorAttribute from the given node
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* @param node The xml element to build the attribute from.
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*
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* @return the attribute, or 0 if the node doesn't contain a vector att.
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*/
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Attribute* vector_xml_att(const xmlNode * node);
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/**
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* Stores the attributes as restricted, these attributes will be used in
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* Template::check
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* @param rattrs Attributes to restrict
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* @param restricted_attributes The attributes will be stored here
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*/
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static void set_restricted_attributes(
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vector<const SingleAttribute *>& rattrs,
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vector<string>& restricted_attributes);
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/**
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* Checks the template for RESTRICTED ATTRIBUTES
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* @param rs_attr the first restricted attribute found if any
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* @return true if a restricted attribute is found in the template
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*/
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bool check(string& rs_attr, const vector<string> &restricted_attributes);
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/**
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* Deletes all restricted attributes
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*/
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void remove_restricted(const vector<string> &restricted_attributes);
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/**
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* Deletes all the attributes, except the restricted ones
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*/
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void remove_all_except_restricted(const vector<string> &restricted_attributes);
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/**
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* Updates the xml root element name
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*
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* @param _xml_root New name
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*/
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void set_xml_root(const char * _xml_root)
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{
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xml_root = _xml_root;
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};
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private:
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bool replace_mode;
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/**
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* Mutex to perform just one flex-bison parsing at a time
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*/
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static pthread_mutex_t mutex;
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/**
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* Character to separate key from value when dump onto a string
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**/
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char separator;
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/**
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* Name of the Root element for the XML document
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*/
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string xml_root;
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/**
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* Builds the template attribute from the node
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* @param root_element The xml element to build the template from.
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*/
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void rebuild_attributes(const xmlNode * root_element);
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/**
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* Gets the all the attributes of the given name and stores a reference
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* to them in a vector. If the selected attribute does not match the
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* requested type it will not be included
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* @param name the attribute name.
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* @param values vector with the values
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*
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* @return the number of elements in the vector
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*/
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template<typename T>
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int __get(const string& name, vector<const T *>& values) const
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{
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pair<multimap<string, Attribute *>::const_iterator,
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multimap<string, Attribute *>::const_iterator> index;
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multimap<string, Attribute *>::const_iterator i;
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int j = 0;
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index = attributes.equal_range(name);
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for (i = index.first; i != index.second ; i++)
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{
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const T * vatt = dynamic_cast<const T *>(i->second);
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if ( vatt == 0 )
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{
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continue;
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}
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values.push_back(vatt);
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j++;
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}
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return j;
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}
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/* Non-const version of get for all attributes */
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template<typename T>
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int __get(const string& name, vector<T *>& values)
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{
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pair<multimap<string, Attribute *>::iterator,
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multimap<string, Attribute *>::iterator> index;
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multimap<string, Attribute *>::iterator i;
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int j = 0;
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index = attributes.equal_range(name);
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for (i = index.first; i != index.second ; i++)
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{
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T * vatt = dynamic_cast<T *>(i->second);
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if ( vatt == 0 )
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{
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continue;
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}
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values.push_back(vatt);
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j++;
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}
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return j;
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}
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/**
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* Gets the first Attribute of the specified type with the given name.
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* Const and non-const versions of this method is provided
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* @param name the attribute name.
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* @return true first attribute or 0 if not found or wrong type
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*/
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template<typename T>
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const T * __get(const string& s) const
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{
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vector<const T*> atts;
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if (__get<T>(s, atts) < 1)
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{
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return 0;
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}
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return atts[0];
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}
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template<typename T>
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T * __get(const string& s)
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{
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return const_cast<T *>(
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static_cast<const Template&>(*this).__get<T>(s));
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}
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template<typename T>
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void _set(vector<T *>& values)
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{
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typename vector<T *>::iterator it;
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for(it = values.begin(); it != values.end(); it++ )
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{
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set(*it);
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}
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}
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};
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/* -------------------------------------------------------------------------- */
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/* -------------------------------------------------------------------------- */
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#endif /*TEMPLATE_H_*/
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