Mega Code Archive
Parse Fraction
<![CDATA[
/*
* Copyright (c) 2003 - 2007 OpenSubsystems s.r.o. Slovak Republic. All rights reserved.
*
* Project: OpenSubsystems
*
* $Id: StringUtils.java,v 1.14 2007/02/20 04:08:10 bastafidli Exp $
*
* 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; version 2 of the License.
*
* 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
*/
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;
/**
* Utility methods for String manipulation.
*
* @version $Id: StringUtils.java,v 1.14 2007/02/20 04:08:10 bastafidli Exp $
* @author Peter Satury
* @code.reviewer Miro Halas
* @code.reviewed 1.11 2006/04/29 00:24:18 jlegeny
*/
public final class StringUtils {
// Constants ////////////////////////////////////////////////////////////////
/**
* Constant for assigning
*/
public static final String EMPTY_STRING = "";
/**
* Constant for assigning
*/
public static final String COMMA_STRING = ",";
/**
* Keep the original case of the string;
*/
public static final int CASE_ORIGINAL = 0;
/**
* Convert the string to upper case.
*/
public static final int CASE_TOUPPER = 1;
/**
* Convert the string to lower case.
*/
public static final int CASE_TOLOWER = 2;
// Constructors /////////////////////////////////////////////////////////////
/**
* Private constructor since this class cannot be instantiated
*/
private StringUtils() {
// Do nothing
}
// Public methods ///////////////////////////////////////////////////////////
/**
* Count number of occurences of lookup in text.
*
* @param text -
* text to search in for occurences of lookup
* @param lookup -
* character to count
* @return int - number of occurences of lookup in text.
*/
public static int count(String text, char lookup) {
int iCount = 0;
if (text != null) {
int iIndex = text.indexOf(lookup);
while (iIndex != -1) {
iCount++;
iIndex = text.indexOf(lookup, iIndex + 1);
}
}
return iCount;
}
/**
* Parse textual representation of fraction to a floating point number
*
* @param textToParse -
* in the form "any_text whole_part quotient/divisor any_text"
* @param defaultValue -
* if the test is unparsable, what default value to return
* @param bIgnoreRest -
* if true, this will ignore the rest of the string (any_other_text)
* after the fraction, if false then the whole string is considered
* @return double - number coresponding to the fraction
*/
public static double parseFraction(String textToParse, double defaultValue, boolean bIgnoreRest) {
double parsed = defaultValue;
int iLength;
int iIndex;
int iIndexStart;
int iIndexEnd;
int iNumber;
// lets use "xxxxxxx 123 456 / 789 yyyyy" as example or
// lets use "xxxxxxx 123 / 789 yyyyy" as example
iIndexStart = 0;
iLength = textToParse.length();
if (bIgnoreRest) {
// Skip while not number
while ((iIndexStart < iLength) && (!Character.isDigit(textToParse.charAt(iIndexStart)))) {
iIndexStart++;
}
// We skiped "xxxxxxx", iIndexStart is at "123 456 / 789 yyyyy"
}
// We should be at first digit
if (iIndexStart < iLength) {
// Find end of the number
iIndex = iIndexStart;
while ((iIndex < iLength) && (Character.isDigit(textToParse.charAt(iIndex)))) {
iIndex++;
}
iIndexEnd = iIndex;
// We skiped "123", iIndexStart is at "123 456 / 789 yyyyy"
// iIndexEnd is at " 456 / 789 yyyyy"
if (iIndexStart != iIndexEnd) {
// There was at least some digits
iNumber = Integer.parseInt(textToParse.substring(iIndexStart, iIndexEnd));
// iNumber is 123
// There was at least one digit, now is it whole part or quotient?
// Skip spaces
while ((iIndex < iLength)
&& ((textToParse.charAt(iIndex) == ' ') || (textToParse.charAt(iIndex) == '-'))) {
iIndex++;
}
// We skiped "123", iIndex is at "456 / 789 yyyyy"
// Now we have stopped because of 2 things, we either reached end of
// string or we have found something other than space, if it is /
// then it was qoutient, if it is digit, then it was whole part
if (iIndex == iLength) {
// it was a whole part and we are done
parsed = iNumber;
} else {
int iQuotient = 0;
int iDivisor = Integer.MAX_VALUE;
if (Character.isDigit(textToParse.charAt(iIndex))) {
int iWholePart = 0;
// it was a whole part and we continue to look for the quotient
iWholePart = iNumber;
// Find end of the number
iIndexStart = iIndex; // Remember start
while ((iIndex < iLength) && (Character.isDigit(textToParse.charAt(iIndex)))) {
iIndex++;
}
iIndexEnd = iIndex;
// We skiped "456", iStartIndex is at "456 / 789 yyyyy"
// And iIndexEnd is at " / 789 yyyyy"
iQuotient = Integer.parseInt(textToParse.substring(iIndexStart, iIndexEnd));
// iQuotient is 456
// Skip spaces
while ((iIndex < iLength) && (textToParse.charAt(iIndex) == ' ')) {
iIndex++;
}
// And iIndex is at "/ 789 yyyyy"
if (textToParse.charAt(iIndex) == '/') {
// It was a quotient and we continue to look for divisor
iIndexStart = iIndex + 1;
while ((iIndexStart < iLength) && (textToParse.charAt(iIndexStart) == ' ')) {
iIndexStart++;
}
// And iIndexStart is at "789 yyyyy"
// We should be at next digit
if (iIndexStart < iLength) {
// Find end of the number
iIndex = iIndexStart;
while ((iIndex < iLength) && (Character.isDigit(textToParse.charAt(iIndex)))) {
iIndex++;
}
iIndexEnd = iIndex;
// We skiped "789", iStartIndex is at "789 yyyyy"
// And iIndexEnd is at " yyyyy"
if (iIndexStart != iIndexEnd) {
iDivisor = Integer.parseInt(textToParse.substring(iIndexStart, iIndexEnd));
// iDivisor is 789
if (iDivisor != 0) {
if (iIndexEnd == iLength) {
// And we are at the end of the string
parsed = ((double) (iWholePart))
+ (((double) iQuotient) / ((double) iDivisor));
} else {
if (bIgnoreRest) {
// And we can ignore what is after
parsed = ((double) (iWholePart))
+ (((double) iQuotient) / ((double) iDivisor));
} else {
// there was something else we don't know what so
// return the default value
}
}
}
} else {
// The divisor is missing, return default value
}
} else {
// The divisor is missing, return default value
}
} else {
// The divisor is missing, return default value
}
} else {
if (textToParse.charAt(iIndex) == '/') {
// And iIndex is at "/ 456 yyyyy"
// It was a quotient and we continue to look for divisor
iQuotient = iNumber;
// iQuotient is 123
iIndexStart = iIndex + 1;
while ((iIndexStart < iLength) && (textToParse.charAt(iIndexStart) == ' ')) {
iIndexStart++;
}
// And iIndexStart is at "456 yyyyy"
// We should be at next digit
if (iIndexStart < iLength) {
// Find end of the number
iIndex = iIndexStart;
while ((iIndex < iLength) && (Character.isDigit(textToParse.charAt(iIndex)))) {
iIndex++;
}
iIndexEnd = iIndex;
// We skipped "456", iIndexStart is at "456 yyyyy"
// iIndexEnd is at " yyyyy"
if (iIndexStart != iIndexEnd) {
iDivisor = Integer.parseInt(textToParse.substring(iIndexStart, iIndexEnd));
// iDivisor is 456
if (iDivisor != 0) {
if (iIndexEnd == iLength) {
// And we are at the end of the string
parsed = ((double) iQuotient) / ((double) iDivisor);
} else {
if (bIgnoreRest) {
// And we can ignore what is after
parsed = ((double) iQuotient) / ((double) iDivisor);
} else {
// there was something else we don't know what so
// return the default value
}
}
}
} else {
// The divisor is missing, return default value
}
} else {
// The divisor is missing, return default value
}
} else {
// It was a whole part and there is something else
if (bIgnoreRest) {
// and we are done
parsed = iNumber;
} else {
// there was something else we don't know what so
// return the default value
}
}
}
}
}
}
return parsed;
}
/**
* Parse String to array of Strings while treating quoted values as single
* element.
*
* @param strParse -
* String to parse
* @param strDel -
* String deliminer
* @param bAllowSingleQuote -
* single qoutes such as ' can be used to group value
* @param bAllowDoubleQuote -
* double quote such as " can be used to group value
* @return String[] - parsed list
* @throws OSSInvalidDataException -
* error during parsing
*/
public static String[] parseQuotedStringToStringArray(String strParse, String strDel,
boolean bAllowSingleQuote, boolean bAllowDoubleQuote) throws Exception {
String[] arrayStrings;
if (strParse == null) {
arrayStrings = null;
} else {
List lstElements = new ArrayList();
int iCurrentIndex = 0;
int iNextIndex;
int iDelLength = strDel.length();
int iParseLength = strParse.length();
while (iCurrentIndex < iParseLength) {
if ((bAllowSingleQuote) && (strParse.charAt(iCurrentIndex) == '\'')) {
// Find next single quote and treat the things in the middle as
// single element
iNextIndex = strParse.indexOf('\'', iCurrentIndex + 1);
if (iNextIndex == -1) {
throw new Exception("Incorrect input. " + strParse
+ " No single quote following the one" + " at location " + iCurrentIndex);
}
lstElements.add(strParse.substring(iCurrentIndex + 1, iNextIndex));
iCurrentIndex = iNextIndex + 1;
if (strParse.substring(iCurrentIndex).startsWith(strDel)) {
iCurrentIndex += iDelLength;
}
} else if ((bAllowDoubleQuote) && (strParse.charAt(iCurrentIndex) == '"')) {
// Find next double quote and treat the things in the middle as
// single element
iNextIndex = strParse.indexOf('"', iCurrentIndex + 1);
if (iNextIndex == -1) {
throw new Exception("Incorrect input. " + strParse
+ " No double quote following the one" + " at location " + iCurrentIndex);
}
lstElements.add(strParse.substring(iCurrentIndex + 1, iNextIndex));
iCurrentIndex = iNextIndex + 1;
if (strParse.substring(iCurrentIndex).startsWith(strDel)) {
iCurrentIndex += iDelLength;
}
} else {
// Find next separator and treat the things in the middle as
// single element
iNextIndex = strParse.indexOf(strDel, iCurrentIndex);
if (iNextIndex == -1) {
// No other delimiter found so take the rest of the string
lstElements.add(strParse.substring(iCurrentIndex));
iCurrentIndex = iParseLength;
} else {
lstElements.add(strParse.substring(iCurrentIndex, iNextIndex));
iCurrentIndex = iNextIndex + iDelLength;
}
}
}
arrayStrings = (String[]) lstElements.toArray(new String[lstElements.size()]);
}
return arrayStrings;
}
/**
* Parse String to array of integers.
*
* @param strParse -
* String to parse
* @param strDel -
* String deliminer
* @return int[] - parsed list
* @throws OSSException -
* error during parsing
*/
public static int[] parseStringToIntArray(String strParse, String strDel) throws Exception {
int[] arrayInts;
try {
if (strParse == null) {
arrayInts = null;
} else {
// TODO: Performance: Memory vs speed, here we allocate list and then
// another array, how about just counting the number of elements
// and then allocating array and parsing directly to array without
// the extra list and copying from list to array?
List lstInts = parseStringToList(strParse, strDel);
if (lstInts == null || lstInts.size() < 1) {
arrayInts = null;
} else {
Iterator items;
int iCount;
arrayInts = new int[lstInts.size()];
for (iCount = 0, items = lstInts.iterator(); items.hasNext();) {
arrayInts[iCount++] = Integer.parseInt(((String) items.next()).trim());
}
}
}
} catch (NumberFormatException eExc) {
throw new RuntimeException("Problems with parsing String to array of int.", eExc);
}
return arrayInts;
}
/**
* Parse String to array of Integers.
*
* @param strParse -
* String to parse
* @param strDel -
* String deliminer
* @return Integer[] - parsed list
* @throws OSSException -
* error during parsing
*/
public static Integer[] parseStringToIntegerArray(String strParse, String strDel)
throws Exception {
Integer[] arrayInts;
try {
if (strParse == null) {
arrayInts = null;
} else {
// TODO: Performance: Memory vs speed, here we allocate list and then
// another array, how about just counting the number of elements
// and then allocating array and parsing directly to array without
// the extra list and copying from list to array?
List strInts = parseStringToList(strParse, strDel);
if (strInts == null || strInts.size() < 1) {
arrayInts = null;
} else {
arrayInts = new Integer[strInts.size()];
for (int iCount = 0; iCount < strInts.size(); iCount++) {
arrayInts[iCount] = Integer.valueOf((String) strInts.get(iCount));
}
}
}
} catch (NumberFormatException eExc) {
throw new RuntimeException("Problems with parsing String to array of int.", eExc);
}
return arrayInts;
}
/**
* Parse String to array of Strings.
*
* @param strParse -
* String to parse
* @param strDel -
* String deliminer
* @return String[] - parsed list
*/
public static String[] parseStringToStringArray(String strParse, String strDel) {
String[] arrayStrings;
if (strParse == null) {
arrayStrings = null;
} else {
// TODO: Performance: Memory vs speed, here we allocate list and then
// another array, how about just counting the number of elements
// and then allocating array and parsing directly to array without
// the extra list and copying from list to array?
List lstStrings = parseStringToList(strParse, strDel);
if ((lstStrings == null) || (lstStrings.isEmpty())) {
arrayStrings = null;
} else {
arrayStrings = (String[]) lstStrings.toArray(new String[lstStrings.size()]);
}
}
return arrayStrings;
}
/**
* Parse array of integers to String.
*
* @param arrParse -
* int array to parse
* @param strDel -
* String deliminer
* @return String - parsed array
*/
public static String parseIntArrayToString(int[] arrParse, String strDel) {
StringBuffer strbInts = new StringBuffer();
if ((arrParse != null) && (arrParse.length > 0)) {
for (int iCount = 0; iCount < arrParse.length; iCount++) {
if (iCount > 0) {
strbInts.append(strDel);
}
strbInts.append(arrParse[iCount]);
}
}
return strbInts.toString();
}
/**
* Parse collection of objects to String by calling toString on each element.
*
* @param colObjects -
* collection of data objects to parse
* @param strDel -
* String deliminer
* @return String - parsed array
*/
public static String parseCollectionToString(Collection colObjects, String strDel) {
StringBuffer strbInts = new StringBuffer();
if ((colObjects != null) && (!colObjects.isEmpty())) {
for (Iterator items = colObjects.iterator(); items.hasNext();) {
if (strbInts.length() > 0) {
strbInts.append(strDel);
}
strbInts.append(items.next().toString());
}
}
return strbInts.toString();
}
/**
* Parse String to List.
*
* @param strParse -
* String to parse
* @param strDel -
* String deliminer
* @return List - parsed list of items in the string delimtied by delimiter
*/
public static List parseStringToList(String strParse, String strDel) {
return (List) parseStringToCollection(strParse, strDel, false, CASE_ORIGINAL, null);
}
/**
* Parse String to ANY collection you specify and trim each item.
*
* @param strParse -
* String to parse
* @param strDel -
* String deliminer
* @param container -
* if specified then it will be filled with items (it WILL NOT be
* emptied first). If this is null, the default collection will be
* allocated. This allows you here to pass list or set so this method
* is more flexible.
* @param bTrim -
* should it be trimmed or not
* @param iConvertCase -
* how to convert the case of the string - one of the CASE_XXX
* costants
* @return Collection - parsed collection, if container was specified, the
* same object will be returned. If it was not specified default
* object will be returned. If strParse was not null, then this will
* be not null.
*/
public static Collection parseStringToCollection(String strParse, String strDel, boolean bTrim,
int iConvertCase, Collection container) {
Collection colReturn;
if (strParse == null || strParse.length() < 1) {
if (container != null) {
colReturn = container;
} else {
colReturn = null;
}
} else {
// TODO: Performance: StringTokenizer is considered to be slow
// because it creates lots of objects internally, consider replacing
// this with String.indexOf(delimiter)
StringTokenizer strTokParse = new StringTokenizer(strParse, strDel);
String strTemp;
if (container == null) {
// This has to be List since parseStringToList requires it
colReturn = new ArrayList();
} else {
container.clear();
colReturn = container;
}
if (strParse.startsWith(strDel)) {
// If the string starts with the delimiter, tokenizer would skip it
// but we have to have empty element in front
colReturn.add("");
}
while (strTokParse.hasMoreTokens()) {
strTemp = (String) strTokParse.nextToken();
if (bTrim) {
strTemp = strTemp.trim();
}
switch (iConvertCase) {
case (CASE_ORIGINAL): {
// do nothing
break;
}
case (CASE_TOUPPER): {
strTemp = strTemp.toUpperCase();
break;
}
case (CASE_TOLOWER): {
strTemp = strTemp.toLowerCase();
break;
}
default: {
assert false : "Incorrect case specification.";
}
}
colReturn.add(strTemp);
}
}
return colReturn;
}
/**
* Method to limit String length for display and add '...' to the end
*
* @param limitLength -
* limit of length
* @param strValue -
* String to limit
* @return String - limited String
*/
public static String limitStringLength(int limitLength, String strValue) {
StringBuffer sbReturn = new StringBuffer();
if ((limitLength > 0) && (strValue.length() > limitLength)) {
// If limit length is lower then 5 we will do just exact substring
if (limitLength < 5) {
sbReturn.append(strValue.substring(0, limitLength));
}
// If limit length is lower then 15 and higher then 4 we will
// return substring of (limit - 3) and '...'
else if (limitLength < 15) {
sbReturn.append(strValue.substring(0, limitLength - 3));
sbReturn.append("...");
}
// If limit length is higher then 15 we will try to find
// some space ' ' near before limit and cut string there
else {
// if we will not find ' ' near before limit
// we will return substring of (limit - 3) and '...'
if ((strValue.indexOf(" ", limitLength - 12) > (limitLength - 4))
|| (strValue.indexOf(" ", limitLength - 12) < 0)) {
sbReturn.append(strValue.substring(0, limitLength - 3));
sbReturn.append("...");
}
// if we will find ' ' near before limit
// we will return substring until ' ' and ' ...'
else {
sbReturn.append(strValue.substring(0, strValue.indexOf(" ", limitLength - 12)));
sbReturn.append(" ...");
}
}
} else {
sbReturn.append(strValue);
}
return sbReturn.toString();
}
/**
* Method to remove comma from start and from end of the string for examples
* to use it as parameter to SQL IN operator
*
* @param strToRemoveFrom -
* String to remove comma from
* @return String - string with removed commas from the start and end of the
* string
*/
public static String removeComma(String strToRemoveFrom) {
// we have to remove comma from start and from end of the string
// because then it can be used for SQL IN operator
if (strToRemoveFrom.length() > 2) {
strToRemoveFrom = strToRemoveFrom.substring(1, strToRemoveFrom.length() - 1);
} else {
strToRemoveFrom = "";
}
return strToRemoveFrom;
}
/**
* Concat all the specified strings to a single one
*
* @param strings -
* strings to concat, all null and empty ones will be ignored
* @param separator -
* separator to put in between the string elements
* @param quote -
* quote string to put around string elements, if null nothing will
* be put around them
* @return String with concatenated inputs
*/
public static String concat(String[] strings, String separator, String quote) {
StringBuffer output = new StringBuffer();
if (strings != null) {
int iIndex;
boolean bSeparator;
boolean bQuote;
bSeparator = (separator != null) && (separator.length() > 0);
bQuote = (quote != null) && (quote.length() > 0);
for (iIndex = 0; iIndex < strings.length; iIndex++) {
if ((strings[iIndex] != null) && (strings[iIndex].length() > 0)) {
if ((output.length() > 0) && (bSeparator)) {
output.append(separator);
}
if (bQuote) {
output.append(quote);
}
output.append(strings[iIndex]);
if (bQuote) {
output.append(quote);
}
}
}
}
return output.toString();
}
/**
* Test if any element in the container contains given string.
*
* @param container -
* container of which elements will be searched to see if they
* contains given text
* @param strSearch -
* text to search in the elements of specified container
* @return boolean - true if any of the elements in container contains given
* text
*/
public static boolean isContained(Collection container, String strSearch) {
boolean bReturn = false;
if ((container != null) && (!container.isEmpty())) {
for (Iterator itrElements = container.iterator(); (itrElements.hasNext() && (!bReturn));) {
if (((String) itrElements.next()).indexOf(strSearch) != -1) {
bReturn = true;
}
}
}
return bReturn;
}
/**
* Test if given string contains any element in the container.
*
* @param container -
* container of which elements will be searched to see if they are
* contained within given text
* @param strSearch -
* text to search in for the elements of specified container
* @return boolean - true if the search text contains any of the elements in
* container
*/
public static boolean contains(Collection container, String strSearch) {
boolean bReturn = false;
if ((container != null) && (!container.isEmpty())) {
for (Iterator itrElements = container.iterator(); (itrElements.hasNext() && (!bReturn));) {
if (strSearch.indexOf((String) itrElements.next()) != -1) {
bReturn = true;
}
}
}
return bReturn;
}
/**
* Method return boolean result if particular substring is contained within
* the list of substrings separated by a separator.
*
* @param strSearchIn -
* string of all substrings separated by separator to search in
* @param strSearchFor -
* string that will be search for
* @param strSeparator -
* item separator
* @return boolean - true if it contains the ID, false otherwise
*/
public static boolean containsInSeparatedString(String strSearchIn, String strSearchFor,
String strSeparator) {
boolean bReturn = false;
StringBuffer sbInputString = new StringBuffer();
StringBuffer sbSearchString = new StringBuffer();
if (strSearchIn.length() > 0) {
// add separator at the beginning and end of the input string
sbInputString.append(strSeparator);
sbInputString.append(strSearchIn);
sbInputString.append(strSeparator);
// add separator at the beginning and end of the search string
sbSearchString.append(strSeparator);
sbSearchString.append(strSearchFor);
sbSearchString.append(strSeparator);
// search for particular ID
if (sbInputString.indexOf(sbSearchString.toString()) != -1) {
bReturn = true;
}
}
return bReturn;
}
}
]]>