Annotation of parser3/src/include/pa_stylesheet_connection.h, revision 1.36
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:
1.36 ! paf 11: static const char * const IDENT_STYLESHEET_CONNECTION_H="$Date: 2003/11/20 16:34:25 $";
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),
1.36 ! paf 43: fstylesheet(0),
! 44: time_used(0),
1.1 parser 45: prev_disk_time(0),
1.36 ! paf 46: used(0) {}
1.1 parser 47:
48: const String& file_spec() { return ffile_spec; }
49:
50: bool expired(time_t older_dies) {
1.19 paf 51: return !used && time_used<older_dies;
1.1 parser 52: }
1.15 paf 53: time_t get_time_used() { return time_used; }
1.1 parser 54:
55: void disconnect() {
1.18 paf 56: xsltFreeStylesheet(fstylesheet); fstylesheet=0;
1.1 parser 57: }
58:
59: bool connected() { return fstylesheet!=0; }
60:
1.18 paf 61: xsltStylesheet *stylesheet(bool nocache) {
1.6 parser 62: time_t new_disk_time=get_new_disk_time();
63: if(nocache || new_disk_time)
1.1 parser 64: load(new_disk_time);
1.18 paf 65: return fstylesheet;
1.1 parser 66: }
67:
68: private:
69:
1.19 paf 70: /// return to cache
1.33 paf 71: void close();
1.19 paf 72:
73: private:
74:
1.1 parser 75: time_t get_new_disk_time() {
76: time_t now_disk_time=get_disk_time();
77: return now_disk_time>prev_disk_time?now_disk_time:0;
78: }
79:
80: void load(time_t new_disk_time) {
1.31 paf 81: int saved=xmlDoValidityCheckingDefaultValue;//
82: xmlDoValidityCheckingDefaultValue=0;//
1.24 paf 83: xsltStylesheet *nstylesheet=
1.33 paf 84: xsltParseStylesheetFile(BAD_CAST ffile_spec.cstr(String::L_FILE_SPEC));
1.31 paf 85: xmlDoValidityCheckingDefaultValue = saved;//
1.28 paf 86: if(xmlHaveGenericErrors()) {
1.20 paf 87: GdomeException exc=0;
1.34 paf 88: throw XmlException(&ffile_spec, exc);
1.28 paf 89: }
90: if(!nstylesheet)
91: throw Exception("file.missing",
1.18 paf 92: &ffile_spec,
1.28 paf 93: "stylesheet failed to load");
1.1 parser 94:
1.18 paf 95: xsltFreeStylesheet(fstylesheet);
96: fstylesheet=nstylesheet;
1.1 parser 97: prev_disk_time=new_disk_time;
98: }
99:
100: time_t get_disk_time() {
101: size_t size;
102: time_t atime, mtime, ctime;
1.27 paf 103: String stamp_file_spec(ffile_spec);
1.1 parser 104: stamp_file_spec << STYLESHEET_FILENAME_STAMP_SUFFIX;
1.3 parser 105: // {file_spec}.stamp modification time OR {file_spec}
106: const String& stat_file_spec=file_readable(stamp_file_spec)?stamp_file_spec:ffile_spec;
1.14 parser 107: file_stat(stat_file_spec,
1.1 parser 108: size,
109: atime, mtime, ctime,
1.14 parser 110: true/*exception on error*/);
1.1 parser 111: return mtime;
112: }
113:
1.19 paf 114: private: // connection usage methods
115:
1.33 paf 116: int used;
1.19 paf 117: void use() {
118: time_used=time(0); // they started to use at this time
119: used++;
120: }
121: void unuse() {
122: used--;
123: if(!used)
124: close();
125: }
126:
127: };
128:
129: /// Auto-object used to track Stylesheet_connection usage
130: class Stylesheet_connection_ptr {
131: Stylesheet_connection *fconnection;
132: public:
133: explicit Stylesheet_connection_ptr(Stylesheet_connection *aconnection) :
134: fconnection(aconnection) {
135: fconnection->use();
136: }
137: ~Stylesheet_connection_ptr() {
138: fconnection->unuse();
139: }
140: Stylesheet_connection* operator->() {
141: return fconnection;
142: }
1.33 paf 143: /* Stylesheet_connection& operator*() {
144: return *fconnection;
145: }*/
1.19 paf 146:
147: // copying
148: Stylesheet_connection_ptr(const Stylesheet_connection_ptr& src) : fconnection(src.fconnection) {
149: fconnection->use();
150: }
151: Stylesheet_connection_ptr& operator =(const Stylesheet_connection_ptr& src) {
152: // may do without this=src check
153: fconnection->unuse();
154: fconnection=src.fconnection;
155: fconnection->use();
156:
157: return *this;
158: }
1.1 parser 159: };
160:
161: #endif
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