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comparison src/share/vm/utilities/xmlstream.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2002-2005 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 class xmlStream;
26 class defaultStream;
27
28 // Sub-stream for writing quoted text, as opposed to markup.
29 // Characters written to this stream are subject to quoting,
30 // as '<' => "&lt;", etc.
31 class xmlTextStream : public outputStream {
32 friend class xmlStream;
33 friend class defaultStream; // tty
34 private:
35
36 xmlStream* _outer_xmlStream;
37
38 xmlTextStream() { _outer_xmlStream = NULL; }
39
40 public:
41 virtual void flush(); // _outer.flush();
42 virtual void write(const char* str, size_t len); // _outer->write_text()
43 };
44
45
46 // Output stream for writing XML-structured logs.
47 // To write markup, use special calls elem, head/tail, etc.
48 // Use the xmlStream::text() stream to write unmarked text.
49 // Text written that way will be quoted as necessary using '&lt;', etc.
50 // Characters written directly to an xmlStream via print_cr, etc.,
51 // are directly written to the encapsulated stream, xmlStream::out().
52 // This can be used to produce markup directly, character by character.
53 // (Such writes are not checked for markup syntax errors.)
54
55 class xmlStream : public outputStream {
56 friend class defaultStream; // tty
57 public:
58 enum MarkupState { BODY, // after end_head() call, in text
59 HEAD, // after begin_head() call, in attrs
60 ELEM }; // after begin_elem() call, in attrs
61
62 protected:
63 outputStream* _out; // file stream by which it goes
64 julong _last_flush; // last position of flush
65 MarkupState _markup_state; // where in the elem/head/tail dance
66 outputStream* _text; // text stream
67 xmlTextStream _text_init;
68
69 // for subclasses
70 xmlStream() {}
71 void initialize(outputStream* out);
72
73 // protect this from public use:
74 outputStream* out() { return _out; }
75
76 // helpers for writing XML elements
77 void va_tag(bool push, const char* format, va_list ap);
78 virtual void see_tag(const char* tag, bool push) NOT_DEBUG({});
79 virtual void pop_tag(const char* tag) NOT_DEBUG({});
80
81 #ifdef ASSERT
82 // in debug mode, we verify matching of opening and closing tags
83 int _element_depth; // number of unfinished elements
84 char* _element_close_stack_high; // upper limit of down-growing stack
85 char* _element_close_stack_low; // upper limit of down-growing stack
86 char* _element_close_stack_ptr; // pointer of down-growing stack
87 #endif
88
89 public:
90 // creation
91 xmlStream(outputStream* out) { initialize(out); }
92 DEBUG_ONLY(virtual ~xmlStream();)
93
94 bool is_open() { return _out != NULL; }
95
96 // text output
97 bool inside_attrs() { return _markup_state != BODY; }
98
99 // flushing
100 virtual void flush(); // flushes out, sets _last_flush = count()
101 virtual void write(const char* s, size_t len);
102 void write_text(const char* s, size_t len); // used by xmlTextStream
103 int unflushed_count() { return (int)(out()->count() - _last_flush); }
104
105 // writing complete XML elements
106 void elem(const char* format, ...);
107 void begin_elem(const char* format, ...);
108 void end_elem(const char* format, ...);
109 void end_elem();
110 void head(const char* format, ...);
111 void begin_head(const char* format, ...);
112 void end_head(const char* format, ...);
113 void end_head();
114 void done(const char* format, ...); // xxx_done event, plus tail
115 void done_raw(const char * kind);
116 void tail(const char* kind);
117
118 // va_list versions
119 void va_elem(const char* format, va_list ap);
120 void va_begin_elem(const char* format, va_list ap);
121 void va_head(const char* format, va_list ap);
122 void va_begin_head(const char* format, va_list ap);
123 void va_done(const char* format, va_list ap);
124
125 // write text (with quoting of special XML characters <>&'" etc.)
126 outputStream* text() { return _text; }
127 void text(const char* format, ...);
128 void va_text(const char* format, va_list ap) {
129 text()->vprint(format, ap);
130 }
131
132 // commonly used XML attributes
133 void stamp(); // stamp='1.234'
134 void method(methodHandle m); // method='k n s' ...
135 void klass(KlassHandle k); // klass='name'
136 void name(symbolHandle s); // name='name'
137 void object(const char* attr, Handle val);
138
139 // print the text alone (sans ''):
140 void method_text(methodHandle m);
141 void klass_text(KlassHandle k); // klass='name'
142 void name_text(symbolHandle s); // name='name'
143 void object_text(Handle x);
144
145 /* Example uses:
146
147 // Empty element, simple case.
148 elem("X Y='Z'"); <X Y='Z'/> \n
149
150 // Empty element, general case.
151 begin_elem("X Y='Z'"); <X Y='Z'
152 ...attrs... ...attrs...
153 end_elem(); />
154
155 // Compound element, simple case.
156 head("X Y='Z'"); <X Y='Z'> \n
157 ...body... ...body...
158 tail("X"); </X> \n
159
160 // Compound element, general case.
161 begin_head("X Y='Z'"); <X Y='Z'
162 ...attrs... ...attrs...
163 end_head(); > \n
164 ...body... ...body...
165 tail("X"); </X> \n
166
167 // Printf-style formatting:
168 elem("X Y='%s'", "Z"); <X Y='Z'/> \n
169
170 */
171
172 };
173
174 // Standard log file, null if no logging is happening.
175 extern xmlStream* xtty;
176
177 // Note: If ::xtty != NULL, ::tty == ::xtty->text().