1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/*
* $Id$
* Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources.
*/
package org.apache.fop.fo;
// FOP
import org.apache.fop.layout.AreaTree;
import org.apache.fop.apps.FOPException;
import org.apache.fop.apps.StreamRenderer;
import org.apache.fop.fo.pagination.Root;
import org.apache.fop.fo.pagination.PageSequence;
import org.apache.fop.extensions.ExtensionObj;
import org.apache.log.Logger;
// SAX
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.SAXException;
import org.xml.sax.InputSource;
import org.xml.sax.Attributes;
// Java
import java.util.HashMap;
import java.util.ArrayList;
import java.io.IOException;
/**
* SAX Handler that builds the formatting object tree.
*
* Modified by Mark Lillywhite mark-fop@inomial.com. Now uses
* StreamRenderer to automagically render the document as
* soon as it receives a page-sequence end-tag. Also,
* calls methods to set up and shut down the renderer at
* the beginning and end of the FO document. Finally,
* supresses adding the PageSequence object to the Root,
* since it is parsed immediately.
*/
public class FOTreeBuilder extends DefaultHandler {
/**
* table mapping element names to the makers of objects
* representing formatting objects
*/
protected HashMap fobjTable = new HashMap();
protected ArrayList namespaces = new ArrayList();
/**
* current formatting object being handled
*/
protected FONode currentFObj = null;
/**
* the root of the formatting object tree
*/
protected FObj rootFObj = null;
/**
* set of names of formatting objects encountered but unknown
*/
protected HashMap unknownFOs = new HashMap();
/**
*
* The class that handles formatting and rendering to a stream
* (mark-fop@inomial.com)
*/
private StreamRenderer streamRenderer;
private Logger log;
private FOUserAgent userAgent;
public FOTreeBuilder() {}
public void setLogger(Logger logger) {
log = logger;
}
public void setUserAgent(FOUserAgent ua) {
userAgent = ua;
}
public FOUserAgent getUserAgent() {
return userAgent;
}
public void setStreamRenderer(StreamRenderer streamRenderer) {
this.streamRenderer = streamRenderer;
}
/**
* add a mapping from element name to maker.
*
* @param namespaceURI namespace URI of formatting object element
* @param localName local name of formatting object element
* @param maker Maker for class representing formatting object
*/
public void addMapping(String namespaceURI, HashMap table) {
this.fobjTable.put(namespaceURI, table);
this.namespaces.add(namespaceURI.intern());
}
/**
* SAX Handler for characters
*/
public void characters(char data[], int start, int length) {
if(currentFObj != null) {
currentFObj.addCharacters(data, start, start + length);
}
}
/**
* SAX Handler for the end of an element
*/
public void endElement(String uri, String localName, String rawName)
throws SAXException {
currentFObj.end();
currentFObj = currentFObj.getParent();
}
/**
* SAX Handler for the start of the document
*/
public void startDocument()
throws SAXException {
rootFObj = null; // allows FOTreeBuilder to be reused
log.info("building formatting object tree");
streamRenderer.startRenderer();
}
public void endDocument()
throws SAXException {
log.info("Parsing of document complete, stopping renderer");
streamRenderer.stopRenderer();
}
/**
* SAX Handler for the start of an element
*/
public void startElement(String uri, String localName, String rawName,
Attributes attlist) throws SAXException {
/* the formatting object started */
FONode fobj;
/* the maker for the formatting object started */
ElementMapping.Maker fobjMaker = null;
HashMap table = (HashMap)fobjTable.get(uri);
if(table != null) {
fobjMaker = (ElementMapping.Maker)table.get(localName);
// try default
if(fobjMaker == null) {
fobjMaker = (ElementMapping.Maker)table.get(ElementMapping.DEFAULT);
}
}
boolean foreignXML = false;
if (fobjMaker == null) {
String fullName = uri + "^" + localName;
if (!this.unknownFOs.containsKey(fullName)) {
this.unknownFOs.put(fullName, "");
log.warn("Unknown formatting object "
+ fullName);
}
if(namespaces.contains(uri.intern())) {
// fall back
fobjMaker = new Unknown.Maker();
} else {
fobjMaker = new UnknownXMLObj.Maker(uri);
foreignXML = true;
}
}
try {
fobj = fobjMaker.make(currentFObj);
fobj.setName(localName);
fobj.setLogger(log);
// set the user agent for resolving user agent values
fobj.setUserAgent(userAgent);
// set the stream renderer so that appropriate
// elements can add pages and handle resolving references
fobj.setStreamRenderer(streamRenderer);
fobj.handleAttrs(attlist);
} catch (FOPException e) {
throw new SAXException(e);
}
if (rootFObj == null) {
if (!fobj.getName().equals("fo:root")) {
throw new SAXException(new FOPException("Root element must"
+ " be fo:root, not "
+ fobj.getName()));
}
rootFObj = (FObj)fobj;
} else {
currentFObj.addChild(fobj);
}
currentFObj = fobj;
}
public void reset() {
currentFObj = null;
rootFObj = null;
streamRenderer = null;
}
public boolean hasData() {
return (rootFObj != null);
}
}
|
