1 /*
2  * Copyright (c) 2012, 2018, 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
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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.
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23  * questions.
24  */
25 
26 package jdk.internal.util.xml.impl;
27 
28 import java.io.BufferedOutputStream;
29 import java.io.IOException;
30 import java.io.OutputStream;
31 import java.io.OutputStreamWriter;
32 import java.io.UnsupportedEncodingException;
33 import java.io.Writer;
34 import java.nio.charset.Charset;
35 import java.nio.charset.CharsetEncoder;
36 import jdk.internal.util.xml.XMLStreamException;
37 
38 /**
39  *
40  * @author huizwang
41  */
42 public class XMLWriter {
43 
44     private Writer _writer;
45     /**
46      * In some cases, this charset encoder is used to determine if a char is
47      * encodable by underlying writer. For example, an 8-bit char from the
48      * extended ASCII set is not encodable by 7-bit ASCII encoder. Unencodable
49      * chars are escaped using XML numeric entities.
50      */
51     private CharsetEncoder _encoder = null;
52 
XMLWriter(OutputStream os, String encoding, Charset cs)53     public XMLWriter(OutputStream os, String encoding, Charset cs) throws XMLStreamException {
54         _encoder = cs.newEncoder();
55         try {
56             _writer = getWriter(os, encoding, cs);
57         } catch (UnsupportedEncodingException ex) {
58             throw new XMLStreamException(ex);
59         }
60 
61     }
62 
canEncode(char ch)63     public boolean canEncode(char ch) {
64         if (_encoder == null) {
65             return false;
66         }
67         return (_encoder.canEncode(ch));
68     }
69 
write(String s)70     public void write(String s)
71             throws XMLStreamException {
72         try {
73             _writer.write(s.toCharArray());
74 //            _writer.write(s.getBytes(Charset.forName(_encoding)));
75         } catch (IOException e) {
76             throw new XMLStreamException("I/O error", e);
77         }
78     }
79 
write(String str, int off, int len)80     public void write(String str, int off, int len)
81             throws XMLStreamException {
82         try {
83             _writer.write(str, off, len);
84         } catch (IOException e) {
85             throw new XMLStreamException("I/O error", e);
86         }
87 
88     }
89 
write(char[] cbuf, int off, int len)90     public void write(char[] cbuf, int off, int len)
91             throws XMLStreamException {
92         try {
93             _writer.write(cbuf, off, len);
94         } catch (IOException e) {
95             throw new XMLStreamException("I/O error", e);
96         }
97 
98     }
99 
write(int b)100     void write(int b)
101             throws XMLStreamException {
102         try {
103             _writer.write(b);
104         } catch (IOException e) {
105             throw new XMLStreamException("I/O error", e);
106         }
107     }
108 
flush()109     void flush() throws XMLStreamException {
110         try {
111             _writer.flush();
112         } catch (IOException ex) {
113             throw new XMLStreamException(ex);
114         }
115     }
116 
close()117     void close() throws XMLStreamException {
118         try {
119             _writer.close();
120         } catch (IOException ex) {
121             throw new XMLStreamException(ex);
122         }
123     }
124 
nl()125     private void nl() throws XMLStreamException {
126         String lineEnd = System.lineSeparator();
127         try {
128             _writer.write(lineEnd);
129         } catch (IOException e) {
130             throw new XMLStreamException("I/O error", e);
131         }
132     }
133 
134     /**
135      * Returns a writer for the specified encoding based on an output stream.
136      *
137      * @param output The output stream
138      * @param encoding The encoding
139      * @return A suitable writer
140      * @throws UnsupportedEncodingException There is no convertor to support
141      * this encoding
142      */
getWriter(OutputStream output, String encoding, Charset cs)143     private Writer getWriter(OutputStream output, String encoding, Charset cs)
144         throws XMLStreamException, UnsupportedEncodingException
145     {
146         if (cs != null) {
147             return (new OutputStreamWriter(new BufferedOutputStream(output), cs));
148         }
149 
150         return new OutputStreamWriter(new BufferedOutputStream(output), encoding);
151     }
152 }
153