Mega Code Archive
Cleans strings of illegal characters with respect to the XML specification
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/*
* JSwiff is an open source Java API for Macromedia Flash file generation
* and manipulation
*
* Copyright (C) 2004-2005 Ralf Terdic (contact@jswiff.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
//package com.jswiff.util;
import java.text.DecimalFormat;
import java.util.Locale;
/**
* Contains some methods for string manipulation.
*/
public class StringUtilities {
/** Default rounding precision (digits after decimal point) */
public static final int DEFAULT_ROUND_PRECISION = 16;
private static DecimalFormat df;
static {
Locale.setDefault(Locale.US);
df = new DecimalFormat();
df.setGroupingUsed(false);
}
/**
* Checks if a string contains illegal characters with respect to the XML
* specification.
*
* @param text the text to be checked
*
* @return true if illegal chars contained, otherwise false
*/
public static boolean containsIllegalChars(String text) {
int size = text.length();
boolean illegal = false;
for (int i = 0; i < size; i++) {
char c = text.charAt(i);
if ((c < 32) && (c != '\t') && (c != '\n') && (c != '\r')) {
illegal = true;
break;
}
}
return illegal;
}
/**
* Converts a double to a string. You can specify the rounding precision,
* i.e. the number of digits after the decimal point.
*
* @param d double to be converted
* @param precision rounding precision
*
* @return a string representing the passed double value
*/
public static String doubleToString(double d, int precision) {
synchronized (df) {
df.setMaximumFractionDigits(precision);
return df.format(d);
}
}
/**
* Converts a double to a string. The default rounding precision is used.
*
* @param d double to be converted
*
* @return a string representing the passed double value
*/
public static String doubleToString(double d) {
return doubleToString(d, DEFAULT_ROUND_PRECISION);
}
/**
* Cleans strings of illegal characters with respect to the XML
* specification.
*
* @param text string to be cleaned
*
* @return the cleaned string
*/
public static String purgeString(String text) {
char[] block = null;
StringBuffer buffer = new StringBuffer();
int i;
int last = 0;
int size = text.length();
for (i = 0; i < size; i++) {
char c = text.charAt(i);
if ((c < 32) && (c != '\t') && (c != '\n') && (c != '\r')) {
// remove character
if (block == null) {
block = text.toCharArray();
}
buffer.append(block, last, i - last);
last = i + 1;
}
}
if (last == 0) {
return text;
}
if (last < size) {
if (block == null) {
block = text.toCharArray();
}
buffer.append(block, last, i - last);
}
return buffer.toString();
}
}
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