net.timewalker.ffmq4.utils.StringTools Maven / Gradle / Ivy
/*
* This file is part of FFMQ.
*
* FFMQ is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* FFMQ 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with FFMQ; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.timewalker.ffmq4.utils;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;
/**
* StringTools
*/
public class StringTools
{
/**
* Test if the given text is null or an empty string
*/
public static boolean isEmpty( String text )
{
return text == null || text.length() == 0;
}
/**
* Test if the given text is not null and not an empty string
*/
public static boolean isNotEmpty( String text )
{
return text != null && text.length() > 0;
}
/**
* Right pad the given string
*/
public static String rightPad( String value , int size , char padChar )
{
if (value.length() >= size)
return value;
StringBuilder result = new StringBuilder(size);
result.append(value);
for (int n = 0 ; n < size-value.length() ; n++)
result.append(padChar);
return result.toString();
}
/**
* Case-aware version of startsWith()
*/
public static boolean startsWith( String text , String prefix , int offset , boolean ignoreCase )
{
if (ignoreCase)
return startsWithIgnoreCase(text,prefix,offset);
else
return text.startsWith(prefix,offset);
}
/**
* Case-insensitive version of startsWith()
*/
public static boolean startsWithIgnoreCase( String text , String prefix , int offset )
{
int textLen = text.length();
int prefixLen = prefix.length();
if (offset < 0 || (offset > textLen - prefixLen))
return false;
for(int n=0;n= textLen) return needleLen == 0 ? textLen : -1;
int i = fromIndex;
if (i < 0)
i = 0;
if (needleLen == 0) return i;
char first = Character.toUpperCase(needle.charAt(0));
int max = textLen - needleLen;
startSearchForFirstChar:
while (true)
{
// Look for first character.
while (i <= max)
{
char c = Character.toUpperCase(text.charAt(i));
if (c != first)
i++;
else
break;
}
if (i > max) return -1;
// Found first character, now look at the rest of the string
int j = i + 1;
int end = j + needleLen - 1;
int k = 1;
while (j < end)
{
char c1 = Character.toUpperCase(text.charAt(j++));
char c2 = Character.toUpperCase(needle.charAt(k++));
if (c1 != c2)
{
i++;
// Look for str's first char again.
continue startSearchForFirstChar;
}
}
return i;
}
}
/**
* Check if the given text matches a pattern
*/
public static boolean matches( String text , String pattern )
{
return matches(text,pattern,false);
}
/**
* Check if the given text matches a pattern
*/
public static boolean matchesIgnoreCase( String text , String pattern )
{
return matches(text,pattern,true);
}
/**
* Check if the given text matches a pattern
*/
protected static boolean matches( String text , String pattern , boolean ignoreCase )
{
if (text == null)
return false;
if (pattern.length() == 0)
return text.length() == 0;
int textPos = 0;
boolean startWithAny = false;
StringTokenizer st = new StringTokenizer(pattern,"*?",true);
while (st.hasMoreTokens())
{
String subPattern = st.nextToken();
if (subPattern.equals("*"))
{
startWithAny = true;
}
else
if (subPattern.equals("?"))
{
if (textPos < text.length())
textPos++;
else
return false;
}
else
{
if (startWithAny)
{
textPos = indexOf(text,subPattern,textPos,ignoreCase);
if (textPos == -1) return false;
startWithAny = false;
}
else
{
if (!startsWith(text,subPattern,textPos,ignoreCase))
return false;
}
textPos += subPattern.length();
}
}
// Remaining text
if (textPos < text.length())
if (!startWithAny)
return false;
return true;
}
/**
* Capitalize the given string (null safe)
* @param text String to capitalize
* @return the capitalized string
*/
public static String capitalize( String text )
{
if (text == null || text.length() == 0)
return text;
if (Character.isLowerCase(text.charAt(0)))
return Character.toUpperCase(text.charAt(0)) + text.substring(1);
else
return text;
}
public static String join( Collection objects , String separator )
{
StringBuilder sb = new StringBuilder();
int count = 0;
Iterator allObjects = objects.iterator();
while (allObjects.hasNext())
{
Object object = allObjects.next();
if (count++ > 0)
sb.append(separator);
sb.append(String.valueOf(object));
}
return sb.toString();
}
public static String join( Object[] objects , String separator )
{
StringBuilder sb = new StringBuilder();
for (int n = 0 ; n < objects.length ; n++)
{
if (n > 0)
sb.append(separator);
sb.append(String.valueOf(objects[n]));
}
return sb.toString();
}
public static String[] split(String str, char separatorChar)
{
if (str == null)
return null;
int len = str.length();
if (len == 0)
return new String[0];
List list = new ArrayList<>();
int i = 0, start = 0;
boolean match = false;
while (i < len)
{
if (str.charAt(i) == separatorChar)
{
if (match)
{
list.add(str.substring(start, i));
match = false;
}
start = ++i;
continue;
}
match = true;
i++;
}
if (match)
list.add(str.substring(start, i));
return list.toArray(new String[list.size()]);
}
/**
* Format the given size
*/
public static String formatSize( long size )
{
if (size == 0)
return "0";
StringBuilder sb = new StringBuilder();
if (size < 0)
{
size = -size;
sb.append("-");
}
long gigs = size / (1024*1024*1024);
if (gigs > 0)
{
sb.append(new DecimalFormat("######.###").format((double)size/(1024*1024*1024)));
sb.append(" GB");
return sb.toString();
}
long megs = size / (1024*1024);
if (megs > 0)
{
sb.append(new DecimalFormat("###.#").format((double)size/(1024*1024)));
sb.append(" MB");
return sb.toString();
}
long kbs = size / (1024);
if (kbs > 0)
{
sb.append(new DecimalFormat("###.#").format((double)size/(1024)));
sb.append(" KB");
return sb.toString();
}
sb.append(size);
sb.append(" B");
return sb.toString();
}
private static final char[] HEX_CHARS = {'0', '1', '2', '3',
'4', '5', '6', '7',
'8', '9', 'a', 'b',
'c', 'd', 'e', 'f',};
public static String asHex(byte[] data)
{
if (data == null || data.length == 0)
return "";
char buf[] = new char[data.length * 2];
for (int i = 0, x = 0; i < data.length; i++)
{
buf[x++] = HEX_CHARS[(data[i] >>> 4) & 0xf];
buf[x++] = HEX_CHARS[data[i] & 0xf];
}
return new String(buf);
}
}
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