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1 package org.exoplatform.services.xml.querying.impl.xtas;
2
3 import org.xml.sax.ContentHandler  ;
4 import org.xml.sax.Attributes ;
5 import org.xml.sax.SAXException ;
6 import org.xml.sax.Locator ;
7
8 public class XTASMLContentHandler implements ContentHandler
9 {
10 private static final int ROOT = 0;
11 private static final int QUERY = 1;
12 private static final int INSTRUCTION = 2;
13
14 private int state = ROOT;
15
16 private boolean hasPrefixes = false;
17
18 private String sourceId;
19 private String destinationId;
20
21 private String match;
22 private String type;
23 private String newValue = "";
24
25
26 public XTASMLContentHandler ()
27 {
28 }
30
31 public void setDocumentLocator (Locator locator)
32 {
33 }
34
35 public void startDocument ()
36 throws SAXException
37 {
38 }
39
40 public void endDocument()
41 throws SAXException
42 {
43 }
44
45 public void startPrefixMapping (String prefix, String uri)
46 throws SAXException
47 {
48 this.hasPrefixes = true;
50 System.out.println("Prefix: "+prefix+" "+uri);
51 }
52
53
54 public void endPrefixMapping (String prefix)
55 throws SAXException
56 {
57 }
58
59 public void startElement (String namespaceURI, String localName,
60 String qName, Attributes atts)
61 throws SAXException
62 {
63
66 if( state == ROOT ) {
67 if( localName.equals("query") ) {
68
69 int n = atts.getLength();
70 for(int i = 0; i < n; i++) {
72 if( atts.getLocalName(i).equals("source") )
73 sourceId = atts.getValue(i);
74 else if( atts.getLocalName(i).equals("destination") )
75 destinationId = atts.getValue(i);
76 else
77 if(!hasPrefixes)
78 throw new SAXException ("Unknown query attribute '"+atts.getQName(i)+"'!");
79 }
80 state = QUERY;
81
82 } else
83 throw new SAXException ("The XTASML's root element must be 'query'!");
84
85 } else if( state == QUERY ) {
86 type = localName;
87 int n = atts.getLength();
88 for(int i = 0; i < n; i++) {
90 if( atts.getLocalName(i).equals("match") || atts.getLocalName(i).equals("xpath") || atts.getLocalName(i).equals("resource"))
91 match=atts.getValue(i);
92 else
93 throw new SAXException ("Unknown query attribute '"+atts.getQName(i)+"'!");
94 }
95 state = INSTRUCTION;
96 } else if( state == INSTRUCTION ) {
97 newValue+="<"+localName;
98 int n = atts.getLength();
99 for(int i = 0; i < n; i++) {
100 newValue+=" "+atts.getLocalName(i)+"=\""+atts.getValue(i)+"\"";
101 }
102 newValue+=">";
103
104 }
105
106
107 }
108
109
110 public void endElement (String namespaceURI, String localName,
111 String qName)
112 throws SAXException
113 {
114 if( localName == type )
115 state = QUERY;
116
117 if( state == INSTRUCTION ) {
118 newValue+="</"+localName+">";
119 }
120
121 }
122
123
124 public void characters (char[] ch, int start, int length)
125 throws SAXException
126 {
127 String s = new String (ch, start, length);
129 newValue+=s.trim();
130
131
133 }
134
135
136 public void ignorableWhitespace (char[] ch, int start, int length)
137 throws SAXException
138 {
139 String s = new String (ch, start, length);
140 newValue+=s;
141
143 }
144
145 public void processingInstruction (String target, String data)
146 throws SAXException
147 {
148 }
149
150 public void skippedEntity (String name)
151 throws SAXException
152 {
153 }
154
155 public String getSourceId()
156 {
157 return sourceId;
158 }
159
160 public String getDestinationId()
161 {
162 return destinationId;
163 }
164
165 public String getType()
166 {
167 return type;
168 }
169
170 public String getMatch()
171 {
172 return match;
173 }
174
175 public String getNewValue()
176 {
177 return newValue;
178 }
179 }
180 |
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