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1 package jfun.yan.xml;
2
3 import java.util.ArrayList  ;
4 import java.util.List ;
5 import java.util.Stack ;
6
7
8
9 import org.xml.sax.SAXException ;
10 import org.xml.sax.SAXParseException ;
11 import org.xml.sax.helpers.DefaultHandler ;
12
13 import org.xml.sax.Locator ;
14
15 class SimpleHandler extends DefaultHandler {
16 private final class TagBuilder{
17 private final Location loc;
18 private final List nodes = new ArrayList ();
19 private final Attributes attrs;
20 private final String uri;
21 private final String name;
22 private final String qname;
23 public String toString(){
24 return name;
25 }
26 TagBuilder(Location loc, String uri, String name, String qname,
27 Attributes attrs) {
28 this.attrs = attrs;
29 this.loc = loc;
30 this.name = name;
31 this.qname = qname;
32 this.uri = uri;
33 }
34 void addNode(Node node){
35 nodes.add(node);
36 }
37 void collectText(TextBuilder tbuilder){
38 if(!tbuilder.isWhitespace()){
39 nodes.add(tbuilder.toNode());
41 }
42 }
43 Tag getResult(TextBuilder tbuilder){
44 if(tbuilder != null){
45 if(!tbuilder.isWhitespace() || nodes.isEmpty()){
46 nodes.add(tbuilder.toNode());
47 }
48 }
49 return new Tag(loc, name, attrs, nodes);
50 }
51 }
52 public Location getLocation(){
53 return MyUtil.toLocation(loc);
54 }
55 private Locator loc;
56 private final Stack builders = new Stack ();
57 private TagBuilder builder = null;
58 private Node result;
59
60 private static final class TextBuilder{
61 private final StringBuffer buf = new StringBuffer ();
62 private final Location loc;
63 private boolean whitespace = true;
64
65 TextBuilder(Location loc) {
66 this.loc = loc;
67 }
68 public Location getLocation() {
69 return loc;
70 }
71 boolean isWhitespace() {
72 return whitespace;
73 }
74 void setWhitespace(boolean whitespace) {
75 this.whitespace = whitespace;
76 }
77 void addText(String s){
78 if(s.trim().length()>0){
79 whitespace = false;
80 }
81 buf.append(s);
82 }
83 public CharacterData toNode(){
84 return new CharacterData(loc, buf.toString());
85 }
86 }
87 private TextBuilder tbuilder = null;
88 private void addText(String s){
89 if(s.length()==0) return;
90 if(tbuilder==null){
91 tbuilder = new TextBuilder(getLocation());
92 }
93 tbuilder.addText(s);
94 }
95 private TextBuilder readText(){
96 if(tbuilder==null) return null;
97 final TextBuilder ret = tbuilder;
98 tbuilder = null;
99 return ret;
100 }
101 public void characters(char[] chars, int start, int length){
102 final String text = new String (chars, start, length);
103 addText(text);
104
128 }
129
130 public void endElement(String uri, String name, String qname) throws SAXException {
131 if(builder == null)
132 throw new IllegalStateException ("not opening tag for "+name);
133 Tag tag = builder.getResult(readText());
134
135 if(builders.isEmpty()){
136 result = tag;
138 }
139 else{
140 this.builder = (TagBuilder)builders.pop();
141 this.builder.addNode(tag);
142 }
143 }
144
145 public void setDocumentLocator(org.xml.sax.Locator loc) {
146 this.loc = loc;
147 }
148 private static Attributes convert(org.xml.sax.Attributes attrs){
149 final int sz = attrs.getLength();
150 final Attributes result = new Attributes(sz);
151 for(int i=0; i<sz; i++){
152 result.add(attrs.getQName(i), attrs.getValue(i));
153 }
154 return result;
155 }
156 private void collectText(TextBuilder tbuilder){
157 if(tbuilder!=null){
158 if(builder==null){
159 if(tbuilder.isWhitespace()){
160 return;
162 }
163 throw new IllegalStateException ("text outside of a tag unrecoginized");
164 }
165 else{
166 builder.collectText(tbuilder);
167 }
168 }
169 }
170 public void startElement(String uri, String name, String qname,
171 org.xml.sax.Attributes attrs){
172
176 collectText(readText());
177 if(builder != null){
178 builders.push(builder);
179 }
180 builder = new TagBuilder(getLocation(), uri, name, qname, convert(attrs));
181 }
182
183 public void error(SAXParseException e) throws SAXException {
184 throw new ConfigurationException("xml error: "+e.getMessage(),
185 e, getLocation());
186 }
187
188 public void fatalError(SAXParseException e) throws SAXException {
189 throw new ConfigurationException("fatal xml error: "+e.getMessage(),
190 e, getLocation());
191 }
192
193 public void warning(SAXParseException e) throws SAXException {
194 System.err.println(e.getMessage());
195 super.warning(e);
196 }
197
198 public Node getResult(){
199 return result;
200 }
201 }
202 |
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