1/*
2 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25/*
26 * Copyright (C) 2004-2011
27 *
28 * Permission is hereby granted, free of charge, to any person obtaining a copy
29 * of this software and associated documentation files (the "Software"), to deal
30 * in the Software without restriction, including without limitation the rights
31 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
32 * copies of the Software, and to permit persons to whom the Software is
33 * furnished to do so, subject to the following conditions:
34 *
35 * The above copyright notice and this permission notice shall be included in
36 * all copies or substantial portions of the Software.
37 *
38 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
39 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
40 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
41 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
42 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
43 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
44 * THE SOFTWARE.
45 */
46package com.sun.xml.internal.rngom.parse.compact;
47
48import java.io.IOException;
49import java.io.InputStream;
50import java.io.InputStreamReader;
51import java.io.PushbackInputStream;
52import java.io.Reader;
53import java.net.URL;
54
55import com.sun.xml.internal.rngom.ast.builder.BuildException;
56import com.sun.xml.internal.rngom.ast.builder.IncludedGrammar;
57import com.sun.xml.internal.rngom.ast.builder.SchemaBuilder;
58import com.sun.xml.internal.rngom.ast.builder.Scope;
59import com.sun.xml.internal.rngom.ast.om.ParsedPattern;
60import com.sun.xml.internal.rngom.parse.IllegalSchemaException;
61import com.sun.xml.internal.rngom.parse.Parseable;
62import com.sun.xml.internal.rngom.xml.util.EncodingMap;
63import org.xml.sax.ErrorHandler;
64import org.xml.sax.InputSource;
65
66/**
67 * RELAX NG schema in the compact syntax.
68 */
69public class CompactParseable implements Parseable {
70  private final InputSource in;
71  private final ErrorHandler eh;
72
73  public CompactParseable(InputSource in, ErrorHandler eh) {
74    this.in = in;
75    this.eh = eh;
76  }
77
78  public ParsedPattern parse(SchemaBuilder sb) throws BuildException, IllegalSchemaException {
79      ParsedPattern p = new CompactSyntax(this, makeReader(in), in.getSystemId(), sb, eh, "").parse(null);
80      return sb.expandPattern(p);
81  }
82
83  public ParsedPattern parseInclude(String uri, SchemaBuilder sb, IncludedGrammar g, String inheritedNs)
84          throws BuildException, IllegalSchemaException {
85    InputSource tem = new InputSource(uri);
86    tem.setEncoding(in.getEncoding());
87    return new CompactSyntax(this, makeReader(tem), uri, sb, eh, inheritedNs).parseInclude(g);
88  }
89
90  public ParsedPattern parseExternal(String uri, SchemaBuilder sb, Scope scope, String inheritedNs)
91          throws BuildException, IllegalSchemaException {
92    InputSource tem = new InputSource(uri);
93    tem.setEncoding(in.getEncoding());
94    return new CompactSyntax(this, makeReader(tem), uri, sb, eh, inheritedNs).parse(scope);
95  }
96
97  private static final String UTF8 = EncodingMap.getJavaName("UTF-8");
98  private static final String UTF16 = EncodingMap.getJavaName("UTF-16");
99
100  private static Reader makeReader(InputSource is) throws BuildException {
101    try {
102      Reader r = is.getCharacterStream();
103      if (r == null) {
104        InputStream in = is.getByteStream();
105        if (in == null) {
106          String systemId = is.getSystemId();
107          in = new URL(systemId).openStream();
108        }
109        String encoding = is.getEncoding();
110        if (encoding == null) {
111          PushbackInputStream pb = new PushbackInputStream(in, 2);
112          encoding = detectEncoding(pb);
113          in = pb;
114        }
115        r = new InputStreamReader(in, encoding);
116      }
117      return r;
118    }
119    catch (IOException e) {
120      throw new BuildException(e);
121    }
122  }
123
124  static private String detectEncoding(PushbackInputStream in) throws IOException {
125    String encoding = UTF8;
126    int b1 = in.read();
127    if (b1 != -1) {
128      int b2 = in.read();
129      if (b2 != -1) {
130        in.unread(b2);
131        if ((b1 == 0xFF && b2 == 0xFE) || (b1 == 0xFE && b2 == 0xFF))
132          encoding = UTF16;
133      }
134      in.unread(b1);
135    }
136    return encoding;
137  }
138}
139