公共类，判断不为空对象，字符串，集合等

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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
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package cn.com.mcd.util;

import java.sql.Timestamp;
import java.util.Collection;
import java.util.Map;

import org.apache.commons.validator.EmailValidator;

import java.util.Calendar;

/**
* General input/data validation methods
* Utility methods for validating data, especially input.
* See detailed description below.
*
* SUMMARY
* 
* This is a set of meethods for validating input. Functions are provided to validate:
* - U.S. and international phone/fax numbers
* - U.S. ZIP codes(5 or 9 digit postal codes)
* - U.S. Postal Codes(2 letter abbreviations for names of states)
* - U.S. Social Security Numbers(abbreviated as SSNs)
* - email addresses
* - dates(entry of year, month, and day and validity of combined date)
* - credit card numbers
* 
* Supporting utility functions validate that:
* - characters are Letter, Digit, or LetterOrDigit
* - strings are a Signed, Positive, Negative, Nonpositive, or Nonnegative integer
* - strings are a Float or a SignedFloat
* - strings are Alphabetic, Alphanumeric, or Whitespace
* - strings contain an integer within a specified range
* 
* Other utility functions are provided to:
* - remove from a string characters which are/are not in a "bag" of selected characters
* - strip whitespace/leading whitespace from a string
* 
* ==============================================================================
* NOTE: This code was adapted from the Netscape JavaScript form validation code,
* usually found in "FormChek.js". Credit card verification functions Originally
* included as Starter Application 1.0.0 in LivePayment.
* ==============================================================================
*/
public class UtilValidate {

public static final String module = UtilValidate.class.getName();

/** boolean specifying by default whether or not it is okay for a String to be empty */
public static final boolean defaultEmptyOK = true;

/** digit characters */
public static final String digits = "0123456789";

/** hex digit characters */
public static final String hexDigits = digits + "abcdefABCDEF";

/** lower-case letter characters */
public static final String lowercaseLetters = "abcdefghijklmnopqrstuvwxyz";

/** upper-case letter characters */
public static final String uppercaseLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

/** letter characters */
public static final String letters = lowercaseLetters + uppercaseLetters;

/** whitespace characters */
public static final String whitespace = " \t\n\r";

/** decimal point character differs by language and culture */
public static final String decimalPointDelimiter = ".";

/** non-digit characters which are allowed in phone numbers */
public static final String phoneNumberDelimiters = "()- ";

/** characters which are allowed in US phone numbers */
public static final String validUSPhoneChars = digits + phoneNumberDelimiters;

/** characters which are allowed in international phone numbers(a leading + is OK) */
public static final String validWorldPhoneChars = digits + phoneNumberDelimiters + "+";

/** non-digit characters which are allowed in Social Security Numbers */
public static final String SSNDelimiters = "- ";

/** characters which are allowed in Social Security Numbers */
public static final String validSSNChars = digits + SSNDelimiters;

/** U.S. Social Security Numbers have 9 digits. They are formatted as 123-45-6789. */
public static final int digitsInSocialSecurityNumber = 9;

/** U.S. phone numbers have 10 digits. They are formatted as 123 456 7890 or(123) 456-7890. */
public static final int digitsInUSPhoneNumber = 10;
public static final int digitsInUSPhoneAreaCode = 3;
public static final int digitsInUSPhoneMainNumber = 7;

/** non-digit characters which are allowed in ZIP Codes */
public static final String ZipCodeDelimiters = "-";

/** our preferred delimiter for reformatting ZIP Codes */
public static final String ZipCodeDelimeter = "-";

/** characters which are allowed in Social Security Numbers */
public static final String validZipCodeChars = digits + ZipCodeDelimiters;

/** U.S. ZIP codes have 5 or 9 digits. They are formatted as 12345 or 12345-6789. */
public static final int digitsInZipCode1 = 5;

/** U.S. ZIP codes have 5 or 9 digits. They are formatted as 12345 or 12345-6789. */
public static final int digitsInZipCode2 = 9;

/** non-digit characters which are allowed in credit card numbers */
public static final String creditCardDelimiters = " -";

public static final String isNotEmptyMsg = "This field cannot be empty, please enter a value.";
public static final String isStateCodeMsg = "The State Code must be a valid two character U.S. state abbreviation(like CA for California).";
public static final String isContiguousStateCodeMsg = "The State Code must be a valid two character U.S. state abbreviation for one of the 48 contiguous United States (like CA for California).";
public static final String isZipCodeMsg = "The ZIP Code must be a 5 or 9 digit U.S. ZIP Code(like 94043).";
public static final String isUSPhoneMsg = "The US Phone must be a 10 digit U.S. phone number(like 415-555-1212).";
public static final String isUSPhoneAreaCodeMsg = "The Phone Number Area Code must be 3 digits.";
public static final String isUSPhoneMainNumberMsg = "The Phone Number must be 7 digits.";
public static final String isContiguousZipCodeMsg = "Zip Code is not a valid Zip Code for one of the 48 contiguous United States .";
public static final String isInternationalPhoneNumberMsg = "The World Phone must be a valid international phone number.";
public static final String isSSNMsg = "The SSN must be a 9 digit U.S. social security number(like 123-45-6789).";
public static final String isEmailMsg = "The Email must be a valid email address(like john@email.com). Please re-enter it now.";
public static final String isAnyCardMsg = "The credit card number is not a valid card number.";
public static final String isCreditCardPrefixMsg = " is not a valid ";
public static final String isCreditCardSuffixMsg = " credit card number.";
public static final String isDayMsg = "The Day must be a day number between 1 and 31. ";
public static final String isMonthMsg = "The Month must be a month number between 1 and 12. ";
public static final String isYearMsg = "The Year must be a 2 or 4 digit year number. ";
public static final String isDatePrefixMsg = "The Day, Month, and Year for ";
public static final String isDateSuffixMsg = " do not form a valid date. Please reenter them now.";
public static final String isHourMsg = "The Hour must be a number between 0 and 23.";
public static final String isMinuteMsg = "The Minute must be a number between 0 and 59.";
public static final String isSecondMsg = "The Second must be a number between 0 and 59.";
public static final String isTimeMsg = "The Time must be a valid time formed like: HH:MM or HH:MM:SS.";
public static final String isDateMsg = "The Date must be a valid date formed like: MM/YY, MM/YYYY, MM/DD/YY, or MM/DD/YYYY.";
public static final String isDateAfterToday = "The Date must be a valid date after today, and formed like: MM/YY, MM/YYYY, MM/DD/YY, or MM/DD/YYYY.";
public static final String isIntegerMsg = "The Number must be a valid unsigned whole decimal number.";
public static final String isSignedIntegerMsg = "The Number must be a valid signed whole decimal number.";
public static final String isLongMsg = "The Number must be a valid unsigned whole decimal number.";
public static final String isSignedLongMsg = "The Number must be a valid signed whole decimal number.";
public static final String isFloatMsg = "The Number must be a valid unsigned decimal number.";
public static final String isSignedFloatMsg = "The Number must be a valid signed decimal number.";
public static final String isSignedDoubleMsg = "The Number must be a valid signed decimal number.";

/** An array of ints representing the number of days in each month of the year.
* Note: February varies depending on the year */
public static final int[] daysInMonth = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

/** Delimiter for USStateCodes String */
public static final String USStateCodeDelimiter = "|";

/** Valid U.S. Postal Codes for states, territories, armed forces, etc.
* See http://www.usps.gov/ncsc/lookups/abbr_state.txt. */
public static final String USStateCodes = "AL|AK|AS|AZ|AR|CA|CO|CT|DE|DC|FM|FL|GA|GU|HI|ID|IL|IN|IA|KS|KY|LA|ME|MH|MD|MA|MI|MN|MS|MO|MT|NE|NV|NH|NJ|NM|NY|NC|ND|MP|OH|OK|OR|PW|PA|PR|RI|SC|SD|TN|TX|UT|VT|VI|VA|WA|WV|WI|WY|AE|AA|AE|AE|AP";

/** Valid contiguous U.S. postal codes */
public static final String ContiguousUSStateCodes = "AL|AZ|AR|CA|CO|CT|DE|DC|FL|GA|ID|IL|IN|IA|KS|KY|LA|ME|MD|MA|MI|MN|MS|MO|MT|NE|NV|NH|NJ|NM|NY|NC|ND|OH|OK|OR|PA|RI|SC|SD|TN|TX|UT|VT|VA|WA|WV|WI|WY";

public static boolean areEqual(Object obj, Object obj2) {
if (obj == null) {
return obj2 == null;
} else {
return obj.equals(obj2);
}
}

/** Check whether an object is empty, will see if it is a String, Map, Collection, etc. */
public static boolean isEmpty(Object value) {
if (value == null) return true;

if (value instanceof String) return ((String) value).length() == 0;
if (value instanceof Collection) return ((Collection<? extends Object>) value).size() == 0;
if (value instanceof Map) return ((Map<? extends Object, ? extends Object>) value).size() == 0;
if (value instanceof CharSequence) return ((CharSequence) value).length() == 0;

// These types would flood the log
// Number covers: BigDecimal, BigInteger, Byte, Double, Float, Integer, Long, Short
if (value instanceof Boolean) return false;
if (value instanceof Number) return false;
if (value instanceof Character) return false;
if (value instanceof java.util.Date) return false;

return false;
}

/**Check the object is not empty**/
public static boolean isNotEmpty(Object value){
return !isEmpty(value);
}

/** Check whether string s is empty. */
public static boolean isEmpty(String s) {
return (s == null) || s.length() == 0;
}

/** Check whether collection c is empty. */
public static <E> boolean isEmpty(Collection<E> c) {
return (c == null) || c.isEmpty();
}

/** Check whether map m is empty. */
public static <K,E> boolean isEmpty(Map<K,E> m) {
return (m == null) || m.isEmpty();
}

/** Check whether charsequence c is empty. */
public static <E> boolean isEmpty(CharSequence c) {
return (c == null) || c.length() == 0;
}

/** Check whether string s is NOT empty. */
public static boolean isNotEmpty(String s) {
return (s != null) && s.length() > 0;
}

/** Check whether collection c is NOT empty. */
public static <E> boolean isNotEmpty(Collection<E> c) {
return (c != null) && !c.isEmpty();
}

/** Check whether charsequence c is NOT empty. */
public static <E> boolean isNotEmpty(CharSequence c) {
return ((c != null) && (c.length() > 0));
}

public static boolean isString(Object obj) {
return ((obj != null) && (obj instanceof java.lang.String));
}

/** Returns true if string s is empty or whitespace characters only. */
public static boolean isWhitespace(String s) {
// Is s empty?
if (isEmpty(s)) return true;

// Search through string's characters one by one
// until we find a non-whitespace character.
// When we do, return false; if we don't, return true.
for (int i = 0; i < s.length(); i++) {
// Check that current character isn't whitespace.
char c = s.charAt(i);

if (whitespace.indexOf(c) == -1) return false;
}
// All characters are whitespace.
return true;
}

/** Removes all characters which appear in string bag from string s. */
public static String stripCharsInBag(String s, String bag) {
int i;
StringBuilder stringBuilder = new StringBuilder("");

// Search through string's characters one by one.
// If character is not in bag, append to returnString.
for (i = 0; i < s.length(); i++) {
char c = s.charAt(i);

if (bag.indexOf(c) == -1) stringBuilder.append(c);
}
return stringBuilder.toString();
}

/** Removes all characters which do NOT appear in string bag from string s. */
public static String stripCharsNotInBag(String s, String bag) {
int i;
StringBuilder stringBuilder = new StringBuilder("");

// Search through string's characters one by one.
// If character is in bag, append to returnString.
for (i = 0; i < s.length(); i++) {
char c = s.charAt(i);

if (bag.indexOf(c) != -1) stringBuilder.append(c);
}
return stringBuilder.toString();
}

/** Removes all whitespace characters from s.
* Member whitespace(see above) defines which characters are considered whitespace. */
public static String stripWhitespace(String s) {
return stripCharsInBag(s, whitespace);
}

/** Returns true if single character c(actually a string) is contained within string s. */
public static boolean charInString(char c, String s) {
return (s.indexOf(c) != -1);
// for(int i = 0; i < s.length; i++) {
// if (s.charAt(i) == c) return true;
// }
// return false;
}

/** Removes initial(leading) whitespace characters from s.
* Member whitespace(see above) defines which characters are considered whitespace. */
public static String stripInitialWhitespace(String s) {
int i = 0;

while ((i < s.length()) && charInString(s.charAt(i), whitespace)) i++;
return s.substring(i);
// return s.substring(i, s.length);
}

/** Returns true if character c is an English letter (A .. Z, a..z).
*
* NOTE: Need i18n version to support European characters.
* This could be tricky due to different character
* sets and orderings for various languages and platforms. */
public static boolean isLetter(char c) {
return Character.isLetter(c);
}

/** Returns true if character c is a digit (0 .. 9). */
public static boolean isDigit(char c) {
return Character.isDigit(c);
}

/** Returns true if character c is a letter or digit. */
public static boolean isLetterOrDigit(char c) {
return Character.isLetterOrDigit(c);
}

/** Returns true if character c is a letter or digit. */
public static boolean isHexDigit(char c) {
return hexDigits.indexOf(c) >= 0;
}

/** Returns true if all characters in string s are numbers.
*
* Accepts non-signed integers only. Does not accept floating
* point, exponential notation, etc.
*/
public static boolean isInteger(String s) {
if (isEmpty(s)) return defaultEmptyOK;

// Search through string's characters one by one
// until we find a non-numeric character.
// When we do, return false; if we don't, return true.
for (int i = 0; i < s.length(); i++) {
// Check that current character is number.
char c = s.charAt(i);

if (!isDigit(c)) return false;
}

// All characters are numbers.
return true;
}

/** Returns true if all characters are numbers;
* first character is allowed to be + or - as well.
*
* Does not accept floating point, exponential notation, etc.
*/
public static boolean isSignedInteger(String s) {
if (isEmpty(s)) return defaultEmptyOK;
try {
Integer.parseInt(s);
return true;
} catch (Exception e) {
return false;
}

// int startPos = 0;
// boolean secondArg = defaultEmptyOK;

// if (isSignedInteger.arguments.length > 1) secondArg = isSignedInteger.arguments[1];

// skip leading + or -
// if ((s.charAt(0) == "-") ||(s.charAt(0) == "+")) startPos = 1;
// return(isInteger(s.substring(startPos, s.length), secondArg))
}

/** Returns true if all characters are numbers;
* first character is allowed to be + or - as well.
*
* Does not accept floating point, exponential notation, etc.
*/
public static boolean isSignedLong(String s) {
if (isEmpty(s)) return defaultEmptyOK;
try {
Long.parseLong(s);
return true;
} catch (Exception e) {
return false;
}
}

/** Returns true if string s is an integer > 0. NOTE: using the Java Long object for greatest precision */
public static boolean isPositiveInteger(String s) {
if (isEmpty(s)) return defaultEmptyOK;

try {
long temp = Long.parseLong(s);

if (temp > 0) return true;
return false;
} catch (Exception e) {
return false;
}

// return(isSignedInteger(s, secondArg)
// &&((isEmpty(s) && secondArg) ||(parseInt(s) > 0)));
}

/** Returns true if string s is an integer >= 0. */
public static boolean isNonnegativeInteger(String s) {
if (isEmpty(s)) return defaultEmptyOK;

try {
int temp = Integer.parseInt(s);

if (temp >= 0) return true;
return false;
} catch (Exception e) {
return false;
}

// return(isSignedInteger(s, secondArg)
// &&((isEmpty(s) && secondArg) ||(parseInt(s) >= 0)));
}

/** Returns true if string s is an integer < 0. */
public static boolean isNegativeInteger(String s) {
if (isEmpty(s)) return defaultEmptyOK;

try {
int temp = Integer.parseInt(s);

if (temp < 0) return true;
return false;
} catch (Exception e) {
return false;
}

// return(isSignedInteger(s, secondArg)
// &&((isEmpty(s) && secondArg) ||(parseInt(s) < 0)));
}

/** Returns true if string s is an integer <= 0. */
public static boolean isNonpositiveInteger(String s) {
if (isEmpty(s)) return defaultEmptyOK;

try {
int temp = Integer.parseInt(s);

if (temp <= 0) return true;
return false;
} catch (Exception e) {
return false;
}

// return(isSignedInteger(s, secondArg)
// &&((isEmpty(s) && secondArg) ||(parseInt(s) <= 0)));
}

/** True if string s is an unsigned floating point(real) number.
*
* Also returns true for unsigned integers. If you wish
* to distinguish between integers and floating point numbers,
* first call isInteger, then call isFloat.
*
* Does not accept exponential notation.
*/
public static boolean isFloat(String s) {
if (isEmpty(s)) return defaultEmptyOK;

boolean seenDecimalPoint = false;

if (s.startsWith(decimalPointDelimiter)) return false;

if (c == decimalPointDelimiter.charAt(0)) {
if (!seenDecimalPoint) {
seenDecimalPoint = true;
} else {
return false;
}
} else {
if (!isDigit(c)) return false;
}
}
// All characters are numbers.
return true;
}

/** General routine for testing whether a string is a float.
*/
public static boolean isFloat(String s, boolean allowNegative, boolean allowPositive, int minDecimal, int maxDecimal) {
if (isEmpty(s)) return defaultEmptyOK;

try {
float temp = Float.parseFloat(s);
if (!allowNegative && temp < 0) return false;
if (!allowPositive && temp > 0) return false;
int decimalPoint = s.indexOf(".");
if (decimalPoint == -1) {
if (minDecimal > 0) return false;
return true;
}
// 1.2345; length=6; point=1; num=4
int numDecimals = s.length() - decimalPoint - 1;
if (minDecimal >= 0 && numDecimals < minDecimal) return false;
if (maxDecimal >= 0 && numDecimals > maxDecimal) return false;
return true;
} catch (Exception e) {
return false;
}
}

/** General routine for testing whether a string is a double.
*/
public static boolean isDouble(String s, boolean allowNegative, boolean allowPositive, int minDecimal, int maxDecimal) {
if (isEmpty(s)) return defaultEmptyOK;

try {
double temp = Double.parseDouble(s);
if (!allowNegative && temp < 0) return false;
if (!allowPositive && temp > 0) return false;
int decimalPoint = s.indexOf(".");
if (decimalPoint == -1) {
if (minDecimal > 0) return false;
return true;
}
// 1.2345; length=6; point=1; num=4
int numDecimals = s.length() - decimalPoint - 1;
if (minDecimal >= 0 && numDecimals < minDecimal) return false;
if (maxDecimal >= 0 && numDecimals > maxDecimal) return false;
return true;
} catch (Exception e) {
return false;
}
}

/** True if string s is a signed or unsigned floating point
* (real) number. First character is allowed to be + or -.
*
* Also returns true for unsigned integers. If you wish
* to distinguish between integers and floating point numbers,
* first call isSignedInteger, then call isSignedFloat.
*/
public static boolean isSignedFloat(String s) {
if (isEmpty(s)) return defaultEmptyOK;
try {
Float.parseFloat(s);
return true;
} catch (Exception e) {
return false;
}

//The old way:
// int startPos = 0;
// if (isSignedFloat.arguments.length > 1) secondArg = isSignedFloat.arguments[1];
// skip leading + or -
// if ((s.charAt(0) == "-") ||(s.charAt(0) == "+")) startPos = 1;
// return(isFloat(s.substring(startPos, s.length), secondArg))
}

/** True if string s is a signed or unsigned floating point
* (real) number. First character is allowed to be + or -.
*
* Also returns true for unsigned integers. If you wish
* to distinguish between integers and floating point numbers,
* first call isSignedInteger, then call isSignedFloat.
*/
public static boolean isSignedDouble(String s) {
if (isEmpty(s)) return defaultEmptyOK;
try {
Double.parseDouble(s);
return true;
} catch (Exception e) {
return false;
}
}

/** Returns true if string s is letters only.
*
* NOTE: This should handle i18n version to support European characters, etc.
* since it now uses Character.isLetter()
*/
public static boolean isAlphabetic(String s) {
if (isEmpty(s)) return defaultEmptyOK;

// Search through string's characters one by one
// until we find a non-alphabetic character.
// When we do, return false; if we don't, return true.
for (int i = 0; i < s.length(); i++) {
// Check that current character is letter.
char c = s.charAt(i);

if (!isLetter(c))
return false;
}

// All characters are letters.
return true;
}

/** Returns true if string s is English letters (A .. Z, a..z) and numbers only.
*
* NOTE: Need i18n version to support European characters.
* This could be tricky due to different character
* sets and orderings for various languages and platforms.
*/
public static boolean isAlphanumeric(String s) {
if (isEmpty(s)) return defaultEmptyOK;

// Search through string's characters one by one
// until we find a non-alphanumeric character.
// When we do, return false; if we don't, return true.
for (int i = 0; i < s.length(); i++) {
// Check that current character is number or letter.
char c = s.charAt(i);

if (!isLetterOrDigit(c)) return false;
}

// All characters are numbers or letters.
return true;
}

/* ================== METHODS TO CHECK VARIOUS FIELDS. ==================== */

/** isSSN returns true if string s is a valid U.S. Social Security Number. Must be 9 digits. */
public static boolean isSSN(String s) {
if (isEmpty(s)) return defaultEmptyOK;

String normalizedSSN = stripCharsInBag(s, SSNDelimiters);

return (isInteger(normalizedSSN) && normalizedSSN.length() == digitsInSocialSecurityNumber);
}

/** isUSPhoneNumber returns true if string s is a valid U.S. Phone Number. Must be 10 digits. */
public static boolean isUSPhoneNumber(String s) {
if (isEmpty(s)) return defaultEmptyOK;
String normalizedPhone = stripCharsInBag(s, phoneNumberDelimiters);

return (isInteger(normalizedPhone) && normalizedPhone.length() == digitsInUSPhoneNumber);
}

/** isUSPhoneAreaCode returns true if string s is a valid U.S. Phone Area Code. Must be 3 digits. */
public static boolean isUSPhoneAreaCode(String s) {
if (isEmpty(s)) return defaultEmptyOK;
String normalizedPhone = stripCharsInBag(s, phoneNumberDelimiters);

return (isInteger(normalizedPhone) && normalizedPhone.length() == digitsInUSPhoneAreaCode);
}

/** isUSPhoneMainNumber returns true if string s is a valid U.S. Phone Main Number. Must be 7 digits. */
public static boolean isUSPhoneMainNumber(String s) {
if (isEmpty(s)) return defaultEmptyOK;
String normalizedPhone = stripCharsInBag(s, phoneNumberDelimiters);

return (isInteger(normalizedPhone) && normalizedPhone.length() == digitsInUSPhoneMainNumber);
}

/** isInternationalPhoneNumber returns true if string s is a valid
* international phone number. Must be digits only; any length OK.
* May be prefixed by + character.
*/
public static boolean isInternationalPhoneNumber(String s) {
if (isEmpty(s)) return defaultEmptyOK;

String normalizedPhone = stripCharsInBag(s, phoneNumberDelimiters);

return isPositiveInteger(normalizedPhone);
}

/** isZIPCode returns true if string s is a valid U.S. ZIP code. Must be 5 or 9 digits only. */
public static boolean isZipCode(String s) {
if (isEmpty(s)) return defaultEmptyOK;

String normalizedZip = stripCharsInBag(s, ZipCodeDelimiters);

return (isInteger(normalizedZip) && ((normalizedZip.length() == digitsInZipCode1) || (normalizedZip.length() == digitsInZipCode2)));
}

/** Returns true if string s is a valid contiguous U.S. Zip code. Must be 5 or 9 digits only. */
public static boolean isContiguousZipCode(String s) {
boolean retval = false;
if (isZipCode(s)) {
if (isEmpty(s)) retval = defaultEmptyOK;
else {
String normalizedZip = s.substring(0,5);
int iZip = Integer.parseInt(normalizedZip);
if ((iZip >= 96701 && iZip <= 96898) || (iZip >= 99501 && iZip <= 99950)) retval = false;
else retval = true;
}
}
return retval;
}

/** Return true if s is a valid U.S. Postal Code (abbreviation for state). */
public static boolean isStateCode(String s) {
if (isEmpty(s)) return defaultEmptyOK;
return ((USStateCodes.indexOf(s) != -1) && (s.indexOf(USStateCodeDelimiter) == -1));
}

/** Return true if s is a valid contiguous U.S. Postal Code (abbreviation for state). */
public static boolean isContiguousStateCode(String s) {
if (isEmpty(s)) return defaultEmptyOK;
return ((ContiguousUSStateCodes.indexOf(s) != -1) && (s.indexOf(USStateCodeDelimiter) == -1));
}

/** isUrl returns true if the string contains ://
* @param s String to validate
* @return true if s contains ://
*/
public static boolean isUrl(String s) {
if (isEmpty(s)) return defaultEmptyOK;
if (s.indexOf("://") != -1)
return true;
return false;
}

/** isYear returns true if string s is a valid
* Year number. Must be 2 or 4 digits only.
*
* For Year 2000 compliance, you are advised
* to use 4-digit year numbers everywhere.
*/
public static boolean isYear(String s) {
if (isEmpty(s)) return defaultEmptyOK;

if (!isNonnegativeInteger(s)) return false;
return ((s.length() == 2) || (s.length() == 4));
}

/** isIntegerInRange returns true if string s is an integer
* within the range of integer arguments a and b, inclusive.
*/
public static boolean isIntegerInRange(String s, int a, int b) {
if (isEmpty(s)) return defaultEmptyOK;
// Catch non-integer strings to avoid creating a NaN below,
// which isn't available on JavaScript 1.0 for Windows.
if (!isSignedInteger(s)) return false;
// Now, explicitly change the type to integer via parseInt
// so that the comparison code below will work both on
// JavaScript 1.2(which typechecks in equality comparisons)
// and JavaScript 1.1 and before(which doesn't).
int num = Integer.parseInt(s);

return ((num >= a) && (num <= b));
}

/** isMonth returns true if string s is a valid month number between 1 and 12. */
public static boolean isMonth(String s) {
if (isEmpty(s)) return defaultEmptyOK;
return isIntegerInRange(s, 1, 12);
}

/** isDay returns true if string s is a valid day number between 1 and 31. */
public static boolean isDay(String s) {
if (isEmpty(s)) return defaultEmptyOK;
return isIntegerInRange(s, 1, 31);
}

/** Given integer argument year, returns number of days in February of that year. */
public static int daysInFebruary(int year) {
// February has 29 days in any year evenly divisible by four,
// EXCEPT for centurial years which are not also divisible by 400.
return (((year % 4 == 0) && ((!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28);
}

/** isHour returns true if string s is a valid number between 0 and 23. */
public static boolean isHour(String s) {
if (isEmpty(s)) return defaultEmptyOK;
return isIntegerInRange(s, 0, 23);
}

/** isMinute returns true if string s is a valid number between 0 and 59. */
public static boolean isMinute(String s) {
if (isEmpty(s)) return defaultEmptyOK;
return isIntegerInRange(s, 0, 59);
}

/** isSecond returns true if string s is a valid number between 0 and 59. */
public static boolean isSecond(String s) {
if (isEmpty(s)) return defaultEmptyOK;
return isIntegerInRange(s, 0, 59);
}

/** isDate returns true if string arguments year, month, and day form a valid date. */
public static boolean isDate(String year, String month, String day) {
// catch invalid years(not 2- or 4-digit) and invalid months and days.
if (!(isYear(year) && isMonth(month) && isDay(day))) return false;

int intYear = Integer.parseInt(year);
int intMonth = Integer.parseInt(month);
int intDay = Integer.parseInt(day);

// catch invalid days, except for February
if (intDay > daysInMonth[intMonth - 1]) return false;
if ((intMonth == 2) && (intDay > daysInFebruary(intYear))) return false;
return true;
}

/** isDate returns true if string argument date forms a valid date. */
public static boolean isDate(String date) {
if (isEmpty(date)) return defaultEmptyOK;
String month;
String day;
String year;

int dateSlash1 = date.indexOf("/");
int dateSlash2 = date.lastIndexOf("/");

if (dateSlash1 <= 0 || dateSlash1 == dateSlash2) return false;
month = date.substring(0, dateSlash1);
day = date.substring(dateSlash1 + 1, dateSlash2);
year = date.substring(dateSlash2 + 1);

return isDate(year, month, day);
}

/** isDate returns true if string argument date forms a valid date and is after today. */
public static boolean isDateAfterToday(String date) {
if (isEmpty(date)) return defaultEmptyOK;
int dateSlash1 = date.indexOf("/");
int dateSlash2 = date.lastIndexOf("/");

if (dateSlash1 <= 0) return false;

java.util.Date passed = null;
if (dateSlash1 == dateSlash2) {
// consider the day to be optional; use the first day of the following month for comparison since this is an is after test
String month = date.substring(0, dateSlash1);
String day = "28";
String year = date.substring(dateSlash1 + 1);
if (!isDate(year, month, day)) return false;

try {
int monthInt = Integer.parseInt(month);
int yearInt = Integer.parseInt(year);
Calendar calendar = Calendar.getInstance();
calendar.set(yearInt, monthInt - 1, 0, 0, 0, 0);
calendar.add(Calendar.MONTH, 1);
passed = new java.util.Date(calendar.getTime().getTime());
} catch (Exception e) {
passed = null;
}
} else {
String month = date.substring(0, dateSlash1);
String day = date.substring(dateSlash1 + 1, dateSlash2);
String year = date.substring(dateSlash2 + 1);
if (!isDate(year, month, day)) return false;
passed = UtilDateTime.toDate(month, day, year, "0", "0", "0");
}

java.util.Date now = UtilDateTime.nowDate();
if (passed != null) {
return passed.after(now);
} else {
return false;
}
}

/** isDate returns true if string argument date forms a valid date and is before today. */
public static boolean isDateBeforeToday(String date) {
if (isEmpty(date)) return defaultEmptyOK;
int dateSlash1 = date.indexOf("/");
int dateSlash2 = date.lastIndexOf("/");

if (dateSlash1 <= 0) return defaultEmptyOK; // In this case an issue number has been provided (requires a javascript check in template!)

java.util.Date now = UtilDateTime.nowDate();
if (passed != null) {
return passed.before(now);
} else {
return false;
}
}

public static boolean isDateBeforeNow(Timestamp date) {
Timestamp now = UtilDateTime.nowTimestamp();
if (date != null) {
return date.before(now);
} else {
return false;
}
}

public static boolean isDateAfterNow(Timestamp date) {
Timestamp now = UtilDateTime.nowTimestamp();
if (date != null) {
return date.after(now);
} else {
return false;
}
}
/** isTime returns true if string arguments hour, minute, and second form a valid time. */
public static boolean isTime(String hour, String minute, String second) {
// catch invalid years(not 2- or 4-digit) and invalid months and days.
if (isHour(hour) && isMinute(minute) && isSecond(second))
return true;
else
return false;
}

/** isTime returns true if string argument time forms a valid time. */
public static boolean isTime(String time) {
if (isEmpty(time)) return defaultEmptyOK;

String hour;
String minute;
String second;

int timeColon1 = time.indexOf(":");
int timeColon2 = time.lastIndexOf(":");

if (timeColon1 <= 0) return false;
hour = time.substring(0, timeColon1);
if (timeColon1 == timeColon2) {
minute = time.substring(timeColon1 + 1);
second = "0";
} else {
minute = time.substring(timeColon1 + 1, timeColon2);
second = time.substring(timeColon2 + 1);
}
return isTime(hour, minute, second);
}

/** Check to see if a card number is a valid ValueLink Gift Card
*
* @param stPassed a string representing a valuelink gift card
* @return true, if the number passed simple checks
*/
public static boolean isValueLinkCard(String stPassed) {
if (isEmpty(stPassed)) return defaultEmptyOK;
String st = stripCharsInBag(stPassed, creditCardDelimiters);
if (st.length() == 16 && (st.startsWith("7") || st.startsWith("6"))) {
return true;
}
return false;
}

/** Check to see if a card number is a valid OFB Gift Card (Certifiicate)
*
* @param stPassed a string representing a gift card
* @return tru, if the number passed simple checks
*/
public static boolean isOFBGiftCard(String stPassed) {
if (isEmpty(stPassed)) return defaultEmptyOK;
String st = stripCharsInBag(stPassed, creditCardDelimiters);
if (st.length() == 15 && sumIsMod10(getLuhnSum(st))) {
return true;
}
return false;
}

/** Check to see if a card number is a supported Gift Card
*
* @param stPassed a string representing a gift card
* @return true, if the number passed simple checks
*/
public static boolean isGiftCard(String stPassed) {
if (isOFBGiftCard(stPassed)) {
return true;
} else if (isValueLinkCard(stPassed)) {
return true;
}
return false;
}

public static int getLuhnSum(String stPassed) {
stPassed = stPassed.replaceAll("\\D", ""); // nuke any non-digit characters

int len = stPassed.length();
int sum = 0;
int mul = 1;
for (int i = len - 1; i >= 0; i--) {
int digit = Character.digit(stPassed.charAt(i), 10);
digit *= (mul == 1) ? mul++ : mul--;
sum += (digit >= 10) ? (digit % 10) + 1 : digit;
}

return sum;
}

public static int getLuhnCheckDigit(String stPassed) {
int sum = getLuhnSum(stPassed);
int mod = ((sum / 10 + 1) * 10 - sum) % 10;
return (10 - mod);
}

public static boolean sumIsMod10(int sum) {
return ((sum % 10) == 0);
}

public static String appendCheckDigit(String stPassed) {
String checkDigit = Integer.toString(getLuhnCheckDigit(stPassed));
return stPassed + checkDigit;
}

/** Checks credit card number with Luhn Mod-10 test
*
* @param stPassed a string representing a credit card number
* @return true, if the credit card number passes the Luhn Mod-10 test, false otherwise
*/
public static boolean isCreditCard(String stPassed) {
if (isEmpty(stPassed)) return defaultEmptyOK;
String st = stripCharsInBag(stPassed, creditCardDelimiters);

// encoding only works on cars with less the 19 digits
if (st.length() > 19) return false;
return sumIsMod10(getLuhnSum(st));
}

/** Checks to see if the cc number is a valid Visa number
*
* @param cc a string representing a credit card number; Sample number: 4111 1111 1111 1111(16 digits)
* @return true, if the credit card number is a valid VISA number, false otherwise
*/
public static boolean isVisa(String cc) {
if (((cc.length() == 16) || (cc.length() == 13)) && (cc.substring(0, 1).equals("4")))
return isCreditCard(cc);
return false;
}

/** Checks to see if the cc number is a valid Master Card number
*
* @param cc a string representing a credit card number; Sample number: 5500 0000 0000 0004(16 digits)
* @return true, if the credit card number is a valid MasterCard number, false otherwise
*/
public static boolean isMasterCard(String cc) {
int firstdig = Integer.parseInt(cc.substring(0, 1));
int seconddig = Integer.parseInt(cc.substring(1, 2));

if ((cc.length() == 16) && (firstdig == 5) && ((seconddig >= 1) && (seconddig <= 5)))
return isCreditCard(cc);
return false;

}

/** Checks to see if the cc number is a valid American Express number
* @param cc - a string representing a credit card number; Sample number: 340000000000009(15 digits)
* @return true, if the credit card number is a valid American Express number, false otherwise
*/
public static boolean isAmericanExpress(String cc) {
int firstdig = Integer.parseInt(cc.substring(0, 1));
int seconddig = Integer.parseInt(cc.substring(1, 2));

if ((cc.length() == 15) && (firstdig == 3) && ((seconddig == 4) || (seconddig == 7)))
return isCreditCard(cc);
return false;

}

/** Checks to see if the cc number is a valid Diners Club number
* @param cc - a string representing a credit card number; Sample number: 30000000000004(14 digits)
* @return true, if the credit card number is a valid Diner's Club number, false otherwise
*/
public static boolean isDinersClub(String cc) {
int firstdig = Integer.parseInt(cc.substring(0, 1));
int seconddig = Integer.parseInt(cc.substring(1, 2));

if ((cc.length() == 14) && (firstdig == 3) && ((seconddig == 0) || (seconddig == 6) || (seconddig == 8)))
return isCreditCard(cc);
return false;
}

/** Checks to see if the cc number is a valid Carte Blanche number
* @param cc - a string representing a credit card number; Sample number: 30000000000004(14 digits)
* @return true, if the credit card number is a valid Carte Blanche number, false otherwise
*/
public static boolean isCarteBlanche(String cc) {
return isDinersClub(cc);
}

/** Checks to see if the cc number is a valid Discover number
* @param cc - a string representing a credit card number; Sample number: 6011000000000004(16 digits)
* @return true, if the credit card number is a valid Discover card number, false otherwise
*/
public static boolean isDiscover(String cc) {
String first4digs = cc.substring(0, 4);

if ((cc.length() == 16) && (first4digs.equals("6011")))
return isCreditCard(cc);
return false;
}

/** Checks to see if the cc number is a valid EnRoute number
* @param cc - a string representing a credit card number; Sample number: 201400000000009(15 digits)
* @return true, if the credit card number is a valid enRoute card number, false, otherwise
*/
public static boolean isEnRoute(String cc) {
String first4digs = cc.substring(0, 4);

if ((cc.length() == 15) && (first4digs.equals("2014") || first4digs.equals("2149")))
return isCreditCard(cc);
return false;
}

/** Checks to see if the cc number is a valid JCB number
* @param cc - a string representing a credit card number; Sample number: 3088000000000009(16 digits)
* @return true, if the credit card number is a valid JCB card number, false otherwise
*/
public static boolean isJCB(String cc) {
String first4digs = cc.substring(0, 4);

if ((cc.length() == 16) &&
(first4digs.equals("3088") ||
first4digs.equals("3096") ||
first4digs.equals("3112") ||
first4digs.equals("3158") ||
first4digs.equals("3337") ||
first4digs.equals("3528")))
return isCreditCard(cc);
return false;
}

/** Checks to see if the cc number is a valid Switch number
* @param cc - a string representing a credit card number; Sample number: 6331100000000096(16 digits)
* @return true, if the credit card number is a valid Switch card number, false otherwise
*/
public static boolean isswitch (String cc) {
String first4digs = cc.substring(0, 4);
String first6digs = cc.substring(0, 6);

if (((cc.length() == 16) || (cc.length() == 18) || (cc.length() == 19)) &&
(first4digs.equals("4903") ||
first4digs.equals("4905") ||
first4digs.equals("4911") ||
first4digs.equals("4936") ||
first6digs.equals("564182") ||
first6digs.equals("633110") ||
first4digs.equals("6333") ||
first4digs.equals("6759")))
return isCreditCard(cc);
return false;
}

/** Checks to see if the cc number is a valid Solo number
* @param cc - a string representing a credit card number; Sample number: 6331100000000096 (16 digits)
* @return true, if the credit card number is a valid Solo card number, false otherwise
*/
public static boolean isSolo(String cc) {
String first4digs = cc.substring(0, 4);
String first2digs = cc.substring(0, 2);
if (((cc.length() == 16) || (cc.length() == 18) || (cc.length() == 19)) &&
(first2digs.equals("63") || first4digs.equals("6767")))
return isCreditCard(cc);
return false;
}

/** Checks to see if the cc number is a valid Visa Electron number
* @param cc - a string representing a credit card number; Sample number: 4175000000000001(16 digits)
* @return true, if the credit card number is a valid Visa Electron card number, false otherwise
*/
public static boolean isVisaElectron(String cc) {
String first6digs = cc.substring(0, 6);
String first4digs = cc.substring(0, 4);

if ((cc.length() == 16) &&
(first6digs.equals("417500") ||
first4digs.equals("4917") ||
first4digs.equals("4913") ||
first4digs.equals("4508") ||
first4digs.equals("4844") ||
first4digs.equals("4027")))
return isCreditCard(cc);
return false;
}

/** Checks to see if the cc number is a valid number for any accepted credit card
* @param ccPassed - a string representing a credit card number
* @return true, if the credit card number is any valid credit card number for any of the accepted card types, false otherwise
*/
public static boolean isAnyCard(String ccPassed) {
if (isEmpty(ccPassed)) return defaultEmptyOK;

String cc = stripCharsInBag(ccPassed, creditCardDelimiters);

if (!isCreditCard(cc)) return false;
if (isMasterCard(cc) || isVisa(cc) || isAmericanExpress(cc) || isDinersClub(cc) ||
isDiscover(cc) || isEnRoute(cc) || isJCB(cc) || isSolo(cc)|| isswitch (cc)|| isVisaElectron(cc))
return true;
return false;
}

/** isNotPoBox returns true if address argument does not contain anything that looks like a a PO Box. */
public static boolean isNotPoBox(String s) {
if (isEmpty(s)) return defaultEmptyOK;

// strings to check from Greg's program
// "P.O. B"
// "P.o.B"
// "P.O B"
// "PO. B"
// "P O B"
// "PO B"
// "P.0. B"
// "P0 B"

String sl = s.toLowerCase();
if (sl.indexOf("p.o. b") != -1) return false;
if (sl.indexOf("p.o.b") != -1) return false;
if (sl.indexOf("p.o b") != -1) return false;
if (sl.indexOf("p o b") != -1) return false;
if (sl.indexOf("po b") != -1) return false;
if (sl.indexOf("pobox") != -1) return false;
if (sl.indexOf("po#") != -1) return false;
if (sl.indexOf("po #") != -1) return false;

// now with 0's for them sneaky folks
if (sl.indexOf("p.0. b") != -1) return false;
if (sl.indexOf("p.0.b") != -1) return false;
if (sl.indexOf("p.0 b") != -1) return false;
if (sl.indexOf("p 0 b") != -1) return false;
if (sl.indexOf("p0 b") != -1) return false;
if (sl.indexOf("p0box") != -1) return false;
if (sl.indexOf("p0#") != -1) return false;
if (sl.indexOf("p0 #") != -1) return false;
return true;
}

public static boolean isValidUpc(String upc) {
if (upc == null || upc.length() != 12) {
throw new IllegalArgumentException("Invalid UPC length; must be 12 characters");
}

char csum = upc.charAt(11);
char calcSum = calcUpcChecksum(upc);
return csum == calcSum;
}

public static char calcUpcChecksum(String upc) {
return calcChecksum(upc, 12);
}

public static boolean isValidEan(String ean) {
if (ean == null || ean.length() != 13) {
throw new IllegalArgumentException("Invalid EAN length; must be 13 characters");
}
char csum = ean.charAt(13);
char calcSum = calcChecksum(ean, 13);
return csum == calcSum;
}

public static char calcChecksum(String value, int length) {
if (value != null && value.length() == length + 1) {
value = value.substring(0, length);
}
if (value == null || value.length() != length) {
throw new IllegalArgumentException("Illegal size of value; must be either" + length + " or " + (length + 1) + " characters");
}
int oddsum = 0;
int evensum = 0;
for (int i = value.length() - 1; i >= 0; i--) {
if ((value.length() - i) % 2 == 0) {
evensum += Character.digit(value.charAt(i), 10);
} else {
oddsum += Character.digit(value.charAt(i), 10);
}
}
int check = 10 - ((evensum + 3 * oddsum) % 10);
if (check >= 10) check = 0;
return Character.forDigit(check, 10);
}

public static String checkValidDatabaseId(String fieldStr) {
if (fieldStr.indexOf(' ') >= 0) {
return "[space found at position " + (fieldStr.indexOf(' ') + 1) + "]";
}
if (fieldStr.indexOf('"') >= 0) {
return "[double-quote found at position " + (fieldStr.indexOf('"') + 1) + "]";
}
if (fieldStr.indexOf('\'') >= 0) {
return "[single-quote found at position " + (fieldStr.indexOf('\'') + 1) + "]";
}
if (fieldStr.indexOf('&') >= 0) {
return "[ampersand found at position " + (fieldStr.indexOf('&') + 1) + "]";
}
if (fieldStr.indexOf('?') >= 0) {
return "[question mark found at position " + (fieldStr.indexOf('?') + 1) + "]";
}
if (fieldStr.indexOf('<') >= 0) {
return "[less-than sign found at position " + (fieldStr.indexOf('<') + 1) + "]";
}
if (fieldStr.indexOf('>') >= 0) {
return "[greater-than sign found at position " + (fieldStr.indexOf('>') + 1) + "]";
}
if (fieldStr.indexOf('\\') >= 0) {
return "[back-slash found at position " + (fieldStr.indexOf('\\') + 1) + "]";
}
if (fieldStr.indexOf('/') >= 0) {
return "[forward-slash found at position " + (fieldStr.indexOf('/') + 1) + "]";
}
return null;
}

public static boolean isValidDatabaseId(String fieldStr, StringBuffer errorDetails) {
boolean isValid = true;
String checkMessage = checkValidDatabaseId(fieldStr);
if (checkMessage != null) {
isValid = false;
errorDetails.append(checkMessage);
}
return isValid;
}

public static boolean isValidDatabaseId(String fieldStr, StringBuilder errorDetails) {
boolean isValid = true;
String checkMessage = checkValidDatabaseId(fieldStr);
if (checkMessage != null) {
isValid = false;
errorDetails.append(checkMessage);
}
return isValid;
}
}

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