Annotation of parser3/src/include/pa_stylesheet_connection.h, revision 1.35
1.1 parser 1: /** @file
1.7 parser 2: Parser: Stylesheet connection decl.
1.1 parser 3:
1.33 paf 4: Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
1.26 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 parser 6: */
7:
8: #ifndef PA_STYLESHEET_CONNECTION_H
9: #define PA_STYLESHEET_CONNECTION_H
1.29 paf 10:
1.35 ! paf 11: static const char * const IDENT_STYLESHEET_CONNECTION_H="$Date: 2003/11/06 09:11:35 $";
1.1 parser 12:
1.22 paf 13: #include "libxslt/xslt.h"
1.18 paf 14: #include "libxslt/xsltInternals.h"
15:
1.33 paf 16:
1.34 paf 17: #include "pa_xml_exception.h"
1.1 parser 18: #include "pa_common.h"
1.33 paf 19: #include "pa_globals.h"
1.9 parser 20:
1.1 parser 21: // defines
22:
23: #define STYLESHEET_FILENAME_STAMP_SUFFIX ".stamp"
24:
25: /** Connection with stylesheet:
26: remembers time and can figure out that it needs recompilation
27: */
1.33 paf 28: class Stylesheet_connection: public PA_Object {
1.1 parser 29:
1.19 paf 30: friend class Stylesheet_connection_ptr;
31:
1.33 paf 32: private:
33:
34: const String& ffile_spec;
35: xsltStylesheet *fstylesheet;
36: time_t time_used;
37: time_t prev_disk_time;
38:
1.1 parser 39: public:
40:
1.33 paf 41: Stylesheet_connection(const String& afile_spec):
1.1 parser 42: ffile_spec(afile_spec),
43: prev_disk_time(0),
1.19 paf 44: fstylesheet(0),
1.33 paf 45: time_used(0), used(0) {}
1.1 parser 46:
47: const String& file_spec() { return ffile_spec; }
48:
49: bool expired(time_t older_dies) {
1.19 paf 50: return !used && time_used<older_dies;
1.1 parser 51: }
1.15 paf 52: time_t get_time_used() { return time_used; }
1.1 parser 53:
54: void disconnect() {
1.18 paf 55: xsltFreeStylesheet(fstylesheet); fstylesheet=0;
1.1 parser 56: }
57:
58: bool connected() { return fstylesheet!=0; }
59:
1.18 paf 60: xsltStylesheet *stylesheet(bool nocache) {
1.6 parser 61: time_t new_disk_time=get_new_disk_time();
62: if(nocache || new_disk_time)
1.1 parser 63: load(new_disk_time);
1.18 paf 64: return fstylesheet;
1.1 parser 65: }
66:
67: private:
68:
1.19 paf 69: /// return to cache
1.33 paf 70: void close();
1.19 paf 71:
72: private:
73:
1.1 parser 74: time_t get_new_disk_time() {
75: time_t now_disk_time=get_disk_time();
76: return now_disk_time>prev_disk_time?now_disk_time:0;
77: }
78:
79: void load(time_t new_disk_time) {
1.31 paf 80: int saved=xmlDoValidityCheckingDefaultValue;//
81: xmlDoValidityCheckingDefaultValue=0;//
1.24 paf 82: xsltStylesheet *nstylesheet=
1.33 paf 83: xsltParseStylesheetFile(BAD_CAST ffile_spec.cstr(String::L_FILE_SPEC));
1.31 paf 84: xmlDoValidityCheckingDefaultValue = saved;//
1.28 paf 85: if(xmlHaveGenericErrors()) {
1.20 paf 86: GdomeException exc=0;
1.34 paf 87: throw XmlException(&ffile_spec, exc);
1.28 paf 88: }
89: if(!nstylesheet)
90: throw Exception("file.missing",
1.18 paf 91: &ffile_spec,
1.28 paf 92: "stylesheet failed to load");
1.1 parser 93:
1.18 paf 94: xsltFreeStylesheet(fstylesheet);
95: fstylesheet=nstylesheet;
1.1 parser 96: prev_disk_time=new_disk_time;
97: }
98:
99: time_t get_disk_time() {
100: size_t size;
101: time_t atime, mtime, ctime;
1.27 paf 102: String stamp_file_spec(ffile_spec);
1.1 parser 103: stamp_file_spec << STYLESHEET_FILENAME_STAMP_SUFFIX;
1.3 parser 104: // {file_spec}.stamp modification time OR {file_spec}
105: const String& stat_file_spec=file_readable(stamp_file_spec)?stamp_file_spec:ffile_spec;
1.14 parser 106: file_stat(stat_file_spec,
1.1 parser 107: size,
108: atime, mtime, ctime,
1.14 parser 109: true/*exception on error*/);
1.1 parser 110: return mtime;
111: }
112:
1.19 paf 113: private: // connection usage methods
114:
1.33 paf 115: int used;
1.19 paf 116: void use() {
117: time_used=time(0); // they started to use at this time
118: used++;
119: }
120: void unuse() {
121: used--;
122: if(!used)
123: close();
124: }
125:
126: };
127:
128: /// Auto-object used to track Stylesheet_connection usage
129: class Stylesheet_connection_ptr {
130: Stylesheet_connection *fconnection;
131: public:
132: explicit Stylesheet_connection_ptr(Stylesheet_connection *aconnection) :
133: fconnection(aconnection) {
134: fconnection->use();
135: }
136: ~Stylesheet_connection_ptr() {
137: fconnection->unuse();
138: }
139: Stylesheet_connection* operator->() {
140: return fconnection;
141: }
1.33 paf 142: /* Stylesheet_connection& operator*() {
143: return *fconnection;
144: }*/
1.19 paf 145:
146: // copying
147: Stylesheet_connection_ptr(const Stylesheet_connection_ptr& src) : fconnection(src.fconnection) {
148: fconnection->use();
149: }
150: Stylesheet_connection_ptr& operator =(const Stylesheet_connection_ptr& src) {
151: // may do without this=src check
152: fconnection->unuse();
153: fconnection=src.fconnection;
154: fconnection->use();
155:
156: return *this;
157: }
1.1 parser 158: };
159:
160: #endif
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