|
1 package com.thaiopensource.relaxng.parse.compact;
2
3 import com.thaiopensource.relaxng.parse.BuildException;
4 import com.thaiopensource.relaxng.parse.IllegalSchemaException;
5 import com.thaiopensource.relaxng.parse.IncludedGrammar;
6 import com.thaiopensource.relaxng.parse.Parseable;
7 import com.thaiopensource.relaxng.parse.ParsedPattern;
8 import com.thaiopensource.relaxng.parse.SchemaBuilder;
9 import com.thaiopensource.relaxng.parse.Scope;
10 import com.thaiopensource.xml.util.EncodingMap;
11 import org.xml.sax.ErrorHandler  ;
12 import org.xml.sax.InputSource ;
13
14 import java.io.IOException ;
15 import java.io.InputStream ;
16 import java.io.InputStreamReader ;
17 import java.io.PushbackInputStream ;
18 import java.io.Reader ;
19 import java.net.URL ;
20
21 public class CompactParseable implements Parseable {
22 private final InputSource in;
23 private final ErrorHandler eh;
24
25 public CompactParseable(InputSource in, ErrorHandler eh) {
26 this.in = in;
27 this.eh = eh;
28 }
29
30 public ParsedPattern parse(SchemaBuilder sb, Scope scope) throws BuildException, IllegalSchemaException {
31 return new CompactSyntax(makeReader(in), in.getSystemId(), sb, eh).parse(scope);
32 }
33
34 public ParsedPattern parseInclude(String uri, SchemaBuilder sb, IncludedGrammar g)
35 throws BuildException, IllegalSchemaException {
36 InputSource tem = new InputSource (uri);
37 tem.setEncoding(in.getEncoding());
38 return new CompactSyntax(makeReader(tem), uri, sb, eh).parseInclude(g);
39 }
40
41 public ParsedPattern parseExternal(String uri, SchemaBuilder sb, Scope scope)
42 throws BuildException, IllegalSchemaException {
43 InputSource tem = new InputSource (uri);
44 tem.setEncoding(in.getEncoding());
45 return new CompactSyntax(makeReader(tem), uri, sb, eh).parse(scope);
46 }
47
48 private static final String UTF8 = EncodingMap.getJavaName("UTF-8");
49 private static final String UTF16 = EncodingMap.getJavaName("UTF-16");
50
51 private static Reader makeReader(InputSource is) throws BuildException {
52 try {
53 Reader r = is.getCharacterStream();
54 if (r == null) {
55 InputStream in = is.getByteStream();
56 if (in == null) {
57 String systemId = is.getSystemId();
58 in = new URL (systemId).openStream();
59 }
60 String encoding = is.getEncoding();
61 if (encoding == null) {
62 PushbackInputStream pb = new PushbackInputStream (in, 2);
63 encoding = detectEncoding(pb);
64 in = pb;
65 }
66 r = new InputStreamReader (in, encoding);
67 }
68 return r;
69 }
70 catch (IOException e) {
71 throw new BuildException(e);
72 }
73 }
74
75 static private String detectEncoding(PushbackInputStream in) throws IOException {
76 String encoding = UTF8;
77 int b1 = in.read();
78 if (b1 != -1) {
79 int b2 = in.read();
80 if (b2 != -1) {
81 in.unread(b2);
82 if ((b1 == 0xFF && b2 == 0xFE) || (b1 == 0xFE && b2 == 0xFF))
83 encoding = UTF16;
84 }
85 in.unread(b1);
86 }
87 return encoding;
88 }
89 }
90 |
Popular Tags |
Java API By Example, From Geeks To Geeks.