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    1   package groovy.xml.streamingmarkupsupport;
    2   /*
    3
    4   Copyright 2004 (C) John Wilson. All Rights Reserved.
    5
    6   Redistribution and use of this software and associated documentation
    7   ("Software"), with or without modification, are permitted provided
    8   that the following conditions are met:
    9
    10  1. Redistributions of source code must retain copyright
    11     statements and notices.  Redistributions must also contain a
    12     copy of this document.
    13
    14  2. Redistributions in binary form must reproduce the
    15     above copyright notice, this list of conditions and the
    16     following disclaimer in the documentation and/or other
    17     materials provided with the distribution.
    18
    19  3. The name "groovy" must not be used to endorse or promote
    20     products derived from this Software without prior written
    21     permission of The Codehaus.  For written permission,
    22     please contact info@codehaus.org.
    23
    24  4. Products derived from this Software may not be called "groovy"
    25     nor may "groovy" appear in their names without prior written
    26     permission of The Codehaus. "groovy" is a registered
    27     trademark of The Codehaus.
    28
    29  5. Due credit should be given to The Codehaus -
    30     http://groovy.codehaus.org/
    31
    32  THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
    33  ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
    34  NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
    35  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
    36  THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
    37  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    38  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    39  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    40  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
    41  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    42  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
    43  OF THE POSSIBILITY OF SUCH DAMAGE.
    44
    45  */
    46
    47  import java.io.IOException;
    48  import java.io.OutputStreamWriter;
    49  import java.io.Writer;
    50  import java.nio.charset.Charset;
    51  import java.nio.charset.CharsetEncoder;
    52
    53  public class StreamingMarkupWriter extends Writer {
    54  	protected final Writer writer;
    55    protected final String encoding;
    56    protected final CharsetEncoder encoder;
    57  	private final Writer bodyWriter =  new Writer() {
    58  											/* (non-Javadoc)
    59  											 * @see java.io.Writer#close()
    60  											 */
    61  											public void close() throws IOException {
    62  												StreamingMarkupWriter.this.close();
    63  											}
    64
    65  											/* (non-Javadoc)
    66  											 * @see java.io.Writer#flush()
    67  											 */
    68  											public void flush() throws IOException {
    69  												StreamingMarkupWriter.this.flush();
    70  											}
    71
    72  											/* (non-Javadoc)
    73  											 * @see java.io.Writer#write(int)
    74  											 */
    75  											public void write(final int c) throws IOException {
    76  												if (!StreamingMarkupWriter.this.encoder.canEncode((char)c)) {
    77  													StreamingMarkupWriter.this.writer.write("&#x");
    78  													StreamingMarkupWriter.this.writer.write(Integer.toHexString(c));
    79  													StreamingMarkupWriter.this.writer.write(';');
    80  												} else if (c == '<') {
    81  													StreamingMarkupWriter.this.writer.write("&lt;");
    82  												} else if (c == '>') {
    83  													StreamingMarkupWriter.this.writer.write("&gt;");
    84  												} else if (c == '&') {
    85  													StreamingMarkupWriter.this.writer.write("&amp;");
    86  												} else {
    87  													StreamingMarkupWriter.this.writer.write(c);
    88  												}
    89  											}
    90
    91  											/* (non-Javadoc)
    92  											 * @see java.io.Writer#write(char[], int, int)
    93  											 */
    94  											public void write(final char[] cbuf, int off, int len) throws IOException {
    95  												while (len-- > 0){
    96  													write(cbuf[off++]);
    97  												}
    98  											}
    99
    100 											public Writer attributeValue() {
    101 												return StreamingMarkupWriter.this.attributeWriter;
    102 											}
    103
    104 											public Writer bodyText() {
    105 												return bodyWriter;
    106 											}
    107
    108 											public Writer unescaped() {
    109 												return StreamingMarkupWriter.this;
    110 											}
    111 										};
    112
    113 	private final Writer attributeWriter =  new Writer() {
    114 												/* (non-Javadoc)
    115 												 * @see java.io.Writer#close()
    116 												 */
    117 												public void close() throws IOException {
    118 													StreamingMarkupWriter.this.close();
    119 												}
    120
    121 												/* (non-Javadoc)
    122 												 * @see java.io.Writer#flush()
    123 												 */
    124 												public void flush() throws IOException {
    125 													StreamingMarkupWriter.this.flush();
    126 												}
    127
    128 												/* (non-Javadoc)
    129 												 * @see java.io.Writer#write(int)
    130 												 */
    131 												public void write(final int c) throws IOException {
    132 													if (c == '\'') {
    133 														StreamingMarkupWriter.this.writer.write("&apos;");
    134 													} else {
    135 														StreamingMarkupWriter.this.bodyWriter.write(c);
    136 													}
    137 												}
    138
    139 												/* (non-Javadoc)
    140 												 * @see java.io.Writer#write(char[], int, int)
    141 												 */
    142 												public void write(final char[] cbuf, int off, int len) throws IOException {
    143 													while (len-- > 0){
    144 														write(cbuf[off++]);
    145 													}
    146 												}
    147
    148 												public Writer attributeValue() {
    149 													return attributeWriter;
    150 												}
    151
    152 												public Writer bodyText() {
    153 													return StreamingMarkupWriter.this.bodyWriter;
    154 												}
    155
    156 												public Writer unescaped() {
    157 													return StreamingMarkupWriter.this;
    158 												}
    159 											};
    160
    161 		public StreamingMarkupWriter(final Writer writer, final String encoding) {
    162 			this.writer = writer;
    163
    164       if (encoding != null) {
    165         this.encoding = encoding;
    166       } else if (writer instanceof OutputStreamWriter) {
    167         this.encoding = ((OutputStreamWriter)writer).getEncoding();
    168       } else {
    169         this.encoding = "US-ASCII";
    170       }
    171
    172       this.encoder = Charset.forName(this.encoding).newEncoder();
    173 		}
    174
    175     public StreamingMarkupWriter(final Writer writer) {
    176       this(writer, null);
    177     }
    178
    179 		/* (non-Javadoc)
    180 		 * @see java.io.Writer#close()
    181 		 */
    182 		public void close() throws IOException {
    183 			this.writer.close();
    184 		}
    185
    186 		/* (non-Javadoc)
    187 		 * @see java.io.Writer#flush()
    188 		 */
    189 		public void flush() throws IOException {
    190 			this.writer.flush();
    191 		}
    192
    193 		/* (non-Javadoc)
    194 		 * @see java.io.Writer#write(char[], int, int)
    195 		 */
    196 		public void write(final char[] cbuf, int off, int len) throws IOException {
    197 			this.writer.write(cbuf, off, len);
    198 		}
    199
    200 		public Writer attributeValue() {
    201 			return this.attributeWriter;
    202 		}
    203
    204 		public Writer bodyText() {
    205 			return this.bodyWriter;
    206 		}
    207
    208 		public Writer unescaped() {
    209 			return this;
    210 		}
    211 	}