Source Code Cross Referenced for JadWriter.java in  » 6.0-JDK-Modules » j2me » com » sun » midp » jadtool » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.midp.jadtool 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *   
003:         *
004:         * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation.
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt).
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions.
025:         */
026:
027:        package com.sun.midp.jadtool;
028:
029:        import java.io.*;
030:
031:        import com.sun.midp.util.Properties;
032:
033:        /**
034:         * A class for writing JAD's. for details see
035:         * {@link #write(Properties, OutputStream, String)}
036:         */
037:        public class JadWriter {
038:            /** prevents anyone from instantiating this class */
039:            private JadWriter() {
040:            };
041:
042:            /**
043:             * Writes this property list (key and element pairs) in this
044:             * <code>Properties</code> table to the output stream in a format suitable
045:             * for loading into a <code>Properties</code> table using the
046:             * <code>load</code> method.
047:             * The stream is written using the character encoding specified by
048:             * <code>enc</code>.
049:             * <p>
050:             * Then every entry in this <code>Properties</code> table is written out,
051:             * one per line. For each entry the key string is written, then an ASCII
052:             * <code>=</code>, then the associated element string. Each character of
053:             * the element string is examined to see whether it should be rendered as
054:             * an escape sequence. Characters less than <code>&#92;u0020</code> and
055:             * characters greater than <code>&#92;u007E</code> are written as
056:             * <code>&#92;u</code><i>xxxx</i> for
057:             * the appropriate hexadecimal value <i>xxxx</i>.
058:             * <p>
059:             * After the entries have been written, the output stream is flushed.  The
060:             * output stream remains open after this method returns.
061:             *
062:             * @param   out      an output stream.
063:             * @param   enc      character encoding used on input stream.
064:             * @exception  IOException if writing this property list to the specified
065:             *             output stream throws an <tt>IOException</tt>.
066:             * @exception  ClassCastException  if this <code>Properties</code> object
067:             *             contains any keys or values that are not 
068:             *             <code>Strings</code>.
069:             */
070:            public static void write(Properties props, OutputStream out,
071:                    String enc) throws IOException {
072:                OutputStreamWriter awriter;
073:                awriter = new OutputStreamWriter(out, enc);
074:
075:                // output in order.
076:                for (int idx = 0; idx < props.size(); idx++) {
077:                    String key = props.getKeyAt(idx);
078:                    String val = props.getValueAt(idx);
079:
080:                    if (enc.equals("ISO8859_1")) {
081:                        key = saveConvert(key);
082:                        val = saveConvert(val);
083:                    }
084:
085:                    // don't forget the required space after the ":"
086:                    writeln(awriter, key + ": " + val);
087:                }
088:
089:                awriter.flush();
090:            }
091:
092:            /**
093:             * Stores properties to the output stream using the ISO 8859-1
094:             * character encoding.
095:             *
096:             * @see #write(Properties, OutputStream, String)
097:             * @param   out      an output stream.
098:             * @exception  IOException if writing this property list to the specified
099:             *             output stream throws an <tt>IOException</tt>.
100:             * @exception  ClassCastException if this <code>Properties</code>
101:             *             object contains any keys or values that are not
102:             *             <code>Strings</code>.
103:             */
104:            public static void write(Properties props, OutputStream out)
105:                    throws IOException {
106:                write(props, out, "UTF-8");
107:            }
108:
109:            private static void writeln(OutputStreamWriter ow, String s)
110:                    throws IOException {
111:                ow.write(s);
112:                ow.write("\n");
113:            }
114:
115:            /*
116:             * Converts unicodes to encoded &#92;uxxxx
117:             * with a preceding slash
118:             */
119:            private static String saveConvert(String theString) {
120:                int len = theString.length();
121:                StringBuffer outBuffer = new StringBuffer(len * 2);
122:
123:                for (int x = 0; x < len; x++) {
124:                    char aChar = theString.charAt(x);
125:
126:                    // don't for get to escape the '/'
127:                    if ((aChar < 0x0020) || (aChar > 0x007e) || aChar == 0x005c) {
128:                        outBuffer.append('\\');
129:                        outBuffer.append('u');
130:                        outBuffer.append(toHex((aChar >> 12) & 0xF));
131:                        outBuffer.append(toHex((aChar >> 8) & 0xF));
132:                        outBuffer.append(toHex((aChar >> 4) & 0xF));
133:                        outBuffer.append(toHex(aChar & 0xF));
134:                        continue;
135:                    }
136:
137:                    outBuffer.append(aChar);
138:                }
139:
140:                return outBuffer.toString();
141:            }
142:
143:            /**
144:             * Convert a nibble to a hex character
145:             * @param nibble the nibble to convert.
146:             * @return a hex digit
147:             */
148:            private static char toHex(int nibble) {
149:                return hexDigit[(nibble & 0xF)];
150:            }
151:
152:            /** A table of hex digits */
153:            private static final char[] hexDigit = { '0', '1', '2', '3', '4',
154:                    '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
155:        }
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