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1
4 package com.tc.aspectwerkz.definition.aspectj5;
5
6 import org.xml.sax.Attributes  ;
7 import org.xml.sax.InputSource ;
8 import org.xml.sax.SAXException ;
9 import org.xml.sax.SAXParseException ;
10 import org.xml.sax.XMLReader ;
11 import org.xml.sax.helpers.DefaultHandler ;
12 import org.xml.sax.helpers.XMLReaderFactory ;
13
14 import com.tc.aspectwerkz.util.Strings;
15
16 import java.io.InputStream ;
17 import java.net.URL ;
18
19
22 public class DocumentParser extends DefaultHandler {
23
24
27 private final static String DTD_PUBLIC_ID = "-//AspectJ//DTD 1.5.0//EN";
28
29
32 private final static String DTD_PUBLIC_ID_ALIAS = "-//AspectJ//DTD//EN";
33
34
37 private final static InputStream DTD_STREAM = DocumentParser.class
38 .getResourceAsStream("/aspectj_1_5_0.dtd");
39
40 private final static String ASPECTJ_ELEMENT = "aspectj";
41 private final static String WEAVER_ELEMENT = "weaver";
42 private final static String DUMP_ELEMENT = "dump";
43 private final static String INCLUDE_ELEMENT = "include";
44 private final static String EXCLUDE_ELEMENT = "exclude";
45 private final static String OPTIONS_ATTRIBUTE = "options";
46 private final static String ASPECTS_ELEMENT = "aspects";
47 private final static String ASPECT_ELEMENT = "aspect";
48 private final static String CONCRETE_ASPECT_ELEMENT = "concrete-aspect";
49 private final static String NAME_ATTRIBUTE = "name";
50 private final static String EXTEND_ATTRIBUTE = "extends";
51 private final static String POINTCUT_ELEMENT = "pointcut";
52 private final static String WITHIN_ATTRIBUTE = "within";
53 private final static String EXPRESSION_ATTRIBUTE = "expression";
54
55 private final Definition m_definition;
56
57 private boolean m_inAspectJ;
58 private boolean m_inWeaver;
59 private boolean m_inAspects;
60
61 private Definition.ConcreteAspect m_lastConcreteAspect;
62
63 private DocumentParser() {
64 m_definition = new Definition();
65 }
66
67 public static Definition parse(final URL url) throws Exception {
68 InputStream in = null;
69 try {
70 DocumentParser parser = new DocumentParser();
71 XMLReader xmlReader = XMLReaderFactory.createXMLReader();
72 xmlReader.setContentHandler(parser);
73 xmlReader.setErrorHandler(parser);
74
75 try {
76 xmlReader.setFeature("http://xml.org/sax/features/validation", false);
77 } catch (SAXException e) {
78 }
80 try {
81 xmlReader.setFeature("http://xml.org/sax/features/external-general-entities", false);
82 } catch (SAXException e) {
83 }
85 try {
86 xmlReader.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
87 } catch (SAXException e) {
88 }
90
91 xmlReader.setEntityResolver(parser);
92 in = url.openStream();
93 xmlReader.parse(new InputSource (in));
94 return parser.m_definition;
95 } finally {
96 try {
97 in.close();
98 } catch (Throwable t) {
99 }
101 }
102 }
103
104 public InputSource resolveEntity(String publicId, String systemId) {
105 if (publicId.equals(DTD_PUBLIC_ID) || publicId.equals(DTD_PUBLIC_ID_ALIAS)) {
106 InputStream in = DTD_STREAM;
107 if (in == null) {
108 System.err.println("AspectJ - WARN - could not read DTD " + publicId);
109 return null;
110 } else {
111 return new InputSource (in);
112 }
113 } else {
114 System.err.println("AspectJ - WARN - unknown DTD " + publicId + " - consider using " + DTD_PUBLIC_ID);
115 return null;
116 }
117 }
118
119 public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
120 if (ASPECT_ELEMENT.equals(qName)) {
121 String name = attributes.getValue(NAME_ATTRIBUTE);
122 if (!isNull(name)) {
123 m_definition.getAspectClassNames().add(name);
124 }
125 } else if (WEAVER_ELEMENT.equals(qName)) {
126 String options = attributes.getValue(OPTIONS_ATTRIBUTE);
127 if (!isNull(options)) {
128 m_definition.appendWeaverOptions(options);
129 }
130 m_inWeaver = true;
131 } else if (CONCRETE_ASPECT_ELEMENT.equals(qName)) {
132 String name = attributes.getValue(NAME_ATTRIBUTE);
133 String extend = attributes.getValue(EXTEND_ATTRIBUTE);
134 if (!isNull(name) && !isNull(extend)) {
135 m_lastConcreteAspect = new Definition.ConcreteAspect(name, extend);
136 m_definition.getConcreteAspects().add(m_lastConcreteAspect);
137 }
138 } else if (POINTCUT_ELEMENT.equals(qName) && m_lastConcreteAspect != null) {
139 String name = attributes.getValue(NAME_ATTRIBUTE);
140 String expression = attributes.getValue(EXPRESSION_ATTRIBUTE);
141 if (!isNull(name) && !isNull(expression)) {
142 m_lastConcreteAspect.pointcuts.add(new Definition.Pointcut(name, replaceXmlAnd(expression)));
143 }
144 } else if (ASPECTJ_ELEMENT.equals(qName)) {
145 if (m_inAspectJ) {
146 throw new SAXException ("Found nested <aspectj> element");
147 }
148 m_inAspectJ = true;
149 } else if (ASPECTS_ELEMENT.equals(qName)) {
150 m_inAspects = true;
151 } else if (INCLUDE_ELEMENT.equals(qName) && m_inWeaver) {
152 String typePattern = attributes.getValue(WITHIN_ATTRIBUTE);
153 if (!isNull(typePattern)) {
154 m_definition.getIncludePatterns().add(typePattern);
155 }
156 } else if (EXCLUDE_ELEMENT.equals(qName) && m_inWeaver) {
157 String typePattern = attributes.getValue(WITHIN_ATTRIBUTE);
158 if (!isNull(typePattern)) {
159 m_definition.getExcludePatterns().add(typePattern);
160 }
161 } else if (DUMP_ELEMENT.equals(qName) && m_inWeaver) {
162 String typePattern = attributes.getValue(WITHIN_ATTRIBUTE);
163 if (!isNull(typePattern)) {
164 m_definition.getDumpPatterns().add(typePattern);
165 }
166 } else if (EXCLUDE_ELEMENT.equals(qName) && m_inAspects) {
167 String typePattern = attributes.getValue(WITHIN_ATTRIBUTE);
168 if (!isNull(typePattern)) {
169 m_definition.getAspectExcludePatterns().add(typePattern);
170 }
171 } else {
172 throw new SAXException ("Unknown element while parsing<aspectj> element: " + qName);
173 }
174 super.startElement(uri, localName, qName, attributes);
175 }
176
177 public void endElement(String uri, String localName, String qName) throws SAXException {
178 if (CONCRETE_ASPECT_ELEMENT.equals(qName)) {
179 m_lastConcreteAspect = null;
180 } else if (ASPECTJ_ELEMENT.equals(qName)) {
181 m_inAspectJ = false;
182 } else if (WEAVER_ELEMENT.equals(qName)) {
183 m_inWeaver = false;
184 } else if (ASPECTS_ELEMENT.equals(qName)) {
185 m_inAspects = false;
186 }
187 super.endElement(uri, localName, qName);
188 }
189
190 public void warning(SAXParseException e) throws SAXException {
192 super.warning(e);
193 }
194
195 public void error(SAXParseException e) throws SAXException {
196 super.error(e);
197 }
198
199 public void fatalError(SAXParseException e) throws SAXException {
200 super.fatalError(e);
201 }
202
203 private static String replaceXmlAnd(String expression) {
204 return Strings.replaceSubString(expression, " AND ", " && ");
206 }
207
208 private boolean isNull(String s) {
209 return s == null || s.length() <= 0;
210 }
211 }
212 |
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