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/*
* Copyright 2002 Phil Burk, Mobileer Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.softsynth.util;
/**
* Tools for reading and writing XML files.
*
* @author Phil Burk, (C) 2002 Mobileer Inc, PROPRIETARY and CONFIDENTIAL
* @see XMLListener
* @see XMLPrinter
*/
public class XMLTools {
static public String replaceCharacters(String text, int ch, String newText) {
// just return same string if character does not occur
int index = text.indexOf(ch);
if (index < 0)
return text;
StringBuffer buffer = new StringBuffer();
index = 0;
while (index < text.length()) {
char cs = text.charAt(index);
if (cs == ch) {
buffer.append(newText);
} else {
buffer.append(cs);
}
index++;
}
return buffer.toString();
}
/** Convert a human readable string into an XML valid string with proper escape sequences.
* Character like '<' must be converted to <
*
* <pre>
* & => &
* < => <
* > => >
* " => "
* ' => '
* </pre>
*/
public static String escapeText(String text) {
text = replaceCharacters(text, '&', "&");
text = replaceCharacters(text, '<', "<");
text = replaceCharacters(text, '>', ">");
text = replaceCharacters(text, '"', """);
text = replaceCharacters(text, '\'', "'");
return text;
}
public static String unescapeText(String text) {
int newchar;
// just return same string if ampersand does not occur
int index = text.indexOf('&');
if (index < 0)
return text;
StringBuffer buffer = new StringBuffer();
index = 0;
while (index < text.length()) {
char cs = text.charAt(index);
if (cs == '&') {
// find ending semicolon
int indexSemiColon = text.indexOf(';', index);
if (indexSemiColon >= 0) {
// figure out replacement string
String repStr = null;
String escape = text.substring(index + 1, indexSemiColon);
if (escape.equals("amp"))
repStr = "&";
else if (escape.equals("lt"))
repStr = "<";
else if (escape.equals("gt"))
repStr = ">";
else if (escape.equals("quot"))
repStr = "\"";
else if (escape.equals("apos"))
repStr = "'";
if (repStr != null)
buffer.append(repStr);
} else
break; // FIXME - throw exception?
index = indexSemiColon;
} else {
buffer.append(cs);
}
index++;
}
return buffer.toString();
}
public static void testText(String text1) {
String text2, text3;
text2 = escapeText(text1);
text3 = unescapeText(text2);
System.out.println("Convert \"" + text1 + "\"");
System.out.println("to \"" + text2 + "\"");
System.out.println("and back to \"" + text3 + "\"");
}
public static void main(String argv[]) {
testText("Is 2 < 3 or is 2 > 3 ?");
testText("Joe's & Fred's <<<wow>>> use quotes \"hey bob\"");
}
}
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