Annotation of parser3/src/include/pa_stylesheet_connection.h, revision 1.23
1.1 parser 1: /** @file
1.7 parser 2: Parser: Stylesheet connection decl.
1.1 parser 3:
4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.16 paf 5: Author: Alexander Petrosyan <paf@design.ru> (http://paf.design.ru)
1.1 parser 6:
1.23 ! paf 7: $Id: pa_stylesheet_connection.h,v 1.22 2002/01/21 16:44:48 paf Exp $
1.1 parser 8: */
9:
10: #ifndef PA_STYLESHEET_CONNECTION_H
11: #define PA_STYLESHEET_CONNECTION_H
12:
1.22 paf 13: #include "libxslt/xslt.h"
1.18 paf 14: #include "libxslt/xsltInternals.h"
15:
1.1 parser 16: #include "pa_pool.h"
1.14 parser 17: #include "pa_stylesheet_manager.h"
1.1 parser 18: #include "pa_exception.h"
19: #include "pa_common.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: */
28: class Stylesheet_connection : public Pooled {
29:
1.19 paf 30: friend class Stylesheet_connection_ptr;
31:
1.1 parser 32: public:
33:
34: Stylesheet_connection(Pool& pool, const String& afile_spec) : Pooled(pool),
35: ffile_spec(afile_spec),
36: prev_disk_time(0),
1.3 parser 37: fservices_pool(0),
1.19 paf 38: fstylesheet(0),
39: time_used(0), used(0) {
1.1 parser 40: }
41:
42: const String& file_spec() { return ffile_spec; }
43:
44: void set_services(Pool *aservices_pool) {
45: fservices_pool=aservices_pool;
46: }
47: bool expired(time_t older_dies) {
1.19 paf 48: return !used && time_used<older_dies;
1.1 parser 49: }
1.15 paf 50: time_t get_time_used() { return time_used; }
1.1 parser 51:
52: void disconnect() {
1.18 paf 53: xsltFreeStylesheet(fstylesheet); fstylesheet=0;
1.1 parser 54: }
55:
56: bool connected() { return fstylesheet!=0; }
57:
1.18 paf 58: xsltStylesheet *stylesheet(bool nocache) {
1.6 parser 59: time_t new_disk_time=get_new_disk_time();
60: if(nocache || new_disk_time)
1.1 parser 61: load(new_disk_time);
1.18 paf 62: return fstylesheet;
1.1 parser 63: }
64:
65: private:
66:
1.19 paf 67: /// return to cache
68: void close() {
69: stylesheet_manager->close_connection(ffile_spec, *this);
70: }
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) {
80: Pool& pool=*fservices_pool;
81:
1.18 paf 82: xsltStylesheet *nstylesheet;
1.23 ! paf 83: {
! 84: int savedReplaceEntities=xmlSubstituteEntitiesDefault(1);
! 85: nstylesheet=xsltParseStylesheetFile(BAD_CAST ffile_spec.cstr(String::UL_FILE_SPEC));
! 86: xmlSubstituteEntitiesDefault(savedReplaceEntities);
! 87: }
1.21 paf 88: if(!nstylesheet || xmlHaveGenericErrors()) {
1.20 paf 89: GdomeException exc=0;
1.18 paf 90: throw Exception(0, 0,
91: &ffile_spec,
1.20 paf 92: exc);
93: }
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;
103: String stamp_file_spec(ffile_spec);
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:
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: private: // connection usage data
127:
128: int used;
129:
1.1 parser 130: private:
131:
132: const String& ffile_spec;
1.18 paf 133: xsltStylesheet *fstylesheet;
1.1 parser 134: time_t time_used;
135: time_t prev_disk_time;
136:
137: private:
138:
139: Pool *fservices_pool;
1.14 parser 140:
141: private:
142: void *malloc(size_t size) { return fservices_pool->malloc(size); }
143: void *calloc(size_t size) { return fservices_pool->calloc(size); }
1.19 paf 144: };
145:
146: /// Auto-object used to track Stylesheet_connection usage
147: class Stylesheet_connection_ptr {
148: Stylesheet_connection *fconnection;
149: public:
150: explicit Stylesheet_connection_ptr(Stylesheet_connection *aconnection) :
151: fconnection(aconnection) {
152: fconnection->use();
153: }
154: ~Stylesheet_connection_ptr() {
155: fconnection->unuse();
156: }
157: Stylesheet_connection* operator->() {
158: return fconnection;
159: }
160:
161: // copying
162: Stylesheet_connection_ptr(const Stylesheet_connection_ptr& src) : fconnection(src.fconnection) {
163: fconnection->use();
164: }
165: Stylesheet_connection_ptr& operator =(const Stylesheet_connection_ptr& src) {
166: // may do without this=src check
167: fconnection->unuse();
168: fconnection=src.fconnection;
169: fconnection->use();
170:
171: return *this;
172: }
1.1 parser 173: };
174:
175: #endif
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