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1 package net.sf.saxon.style;
2 import net.sf.saxon.expr.Expression;
3 import net.sf.saxon.instruct.Executable;
4 import net.sf.saxon.om.AttributeCollection;
5 import net.sf.saxon.trans.XPathException;
6
7 import javax.xml.transform.TransformerException  ;
8 import java.net.MalformedURLException ;
9 import java.net.URL ;
10 import java.net.URLClassLoader ;
11 import java.util.StringTokenizer ;
12
13
16
17 public class SaxonScript extends StyleElement {
18
19 private Class javaClass = null;
20 private String implementsURI = null;
21 private String language = null;
22
23 public void prepareAttributes() throws XPathException {
24
25 String languageAtt = null;
26 String implementsAtt = null;
27 String srcAtt = null;
28 String archiveAtt = null;
29
30 AttributeCollection atts = getAttributeList();
31
32 for (int a=0; a<atts.getLength(); a++) {
33 int nc = atts.getNameCode(a);
34 String f = getNamePool().getClarkName(nc);
35 if (f==StandardNames.LANGUAGE) {
36 languageAtt = atts.getValue(a).trim();
37 } else if (f==StandardNames.IMPLEMENTS_PREFIX) {
38 implementsAtt = atts.getValue(a).trim();
39 } else if (f==StandardNames.SRC) {
40 srcAtt = atts.getValue(a).trim();
41 } else if (f==StandardNames.ARCHIVE) {
42 archiveAtt = atts.getValue(a).trim();
43 } else {
44 checkUnknownAttribute(nc);
45 }
46 }
47 if (implementsAtt==null) {
48 reportAbsence("implements-prefix");
49 return;
50 }
51 implementsURI = getURIForPrefix(implementsAtt, false);
52 if (implementsURI == null) {
53 undeclaredNamespaceError(implementsAtt, null);
54 return;
55 }
56
57 if (languageAtt==null) {
58 reportAbsence("language");
59 return;
60 }
61 language = languageAtt;
62
63 if (language.equals("java")) {
64 if (srcAtt==null) {
65 compileError("For java, the src attribute is mandatory");
66 return;
67 }
68 if (!srcAtt.startsWith("java:")) {
69 compileError("The src attribute must be a URI of the form java:full.class.Name");
70 return;
71 }
72 String className = srcAtt.substring(5);
73
74 if (archiveAtt==null) {
75 try {
76 javaClass = getConfiguration().getClass(className, false, null);
77 } catch (TransformerException err) {
78 compileError(err);
79 return;
80 }
81 } else {
82 URL base;
83 try {
84 base = new URL (getBaseURI());
85 } catch (MalformedURLException err) {
86 compileError("Invalid base URI " + getBaseURI());
87 return;
88 }
89 StringTokenizer st = new StringTokenizer (archiveAtt);
90 int count = 0;
91 while (st.hasMoreTokens()) {
92 count++;
93 st.nextToken();
94 }
95 URL [] urls = new URL [count];
96 count = 0;
97 st = new StringTokenizer (archiveAtt);
98 while (st.hasMoreTokens()) {
99 String s = st.nextToken();
100 try {
101 urls[count++] = new URL (base, s);
102 } catch (MalformedURLException err) {
103 compileError("Invalid URL " + s);
104 return;
105 }
106 }
107 try {
108 javaClass = new URLClassLoader (urls).loadClass(className);
109 } catch (java.lang.ClassNotFoundException err) {
110 compileError("Cannot find class " + className + " in the specified archive"
111 + (count>1 ? "s" : ""));
112 } catch (java.lang.NoClassDefFoundError err2) {
113 compileError("Cannot use the archive attribute with this Java VM");
114 }
115 }
116 } else {
117 compileError("The only language supported for Saxon extension functions is 'java'");
119 }
120 getPrincipalStylesheet().declareJavaClass(implementsURI, javaClass);
121 }
122
123 public void validate() throws XPathException {
124 checkTopLevel(null);
125 }
126
127 public Expression compile(Executable exec) throws XPathException {
128 return null;
129 }
130
131
132
136
137
155 }
156
157
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