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Panda Core is the core module of Panda Framework, it contains commonly used utility classes similar to apache-commons.
package panda.lang;
import java.lang.reflect.Array;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.Locale;
/**
* Utility class for Number.
*/
public class Numbers {
/** 1KB */
public static final int KB = 1024;
/** 1KB BigInteger */
public static final BigInteger BI_KB = BigInteger.valueOf(KB);
/** 1KB BigDecimal */
public static final BigDecimal BD_KB = BigDecimal.valueOf(KB);
/** 1MB */
public static final int MB = KB * KB;
/** 1MB BigInteger */
public static final BigInteger BI_MB = BigInteger.valueOf(MB);
/** 1MB BigDecimal */
public static final BigDecimal BD_MB = BigDecimal.valueOf(MB);
/** 1GB */
public static final long GB = MB * 1024L;
/** 1GB BigInteger */
public static final BigInteger BI_GB = BigInteger.valueOf(GB);
/** 1GB BigDecimal */
public static final BigDecimal BD_GB = BigDecimal.valueOf(GB);
/** 1TB */
public static final long TB = GB * KB;
/** 1TB BigInteger */
public static final BigInteger BI_TB = BigInteger.valueOf(TB);
/** 1TB BigDecimal */
public static final BigDecimal BD_TB = BigDecimal.valueOf(TB);
/** 1PB */
public static final long PB = TB * KB;
/** 1PB BigInteger */
public static final BigInteger BI_PB = BigInteger.valueOf(PB);
/** 1PB BigDecimal */
public static final BigDecimal BD_PB = BigDecimal.valueOf(PB);
/** 1EB */
public static final long EB = PB * KB;
/** 1EB BigInteger */
public static final BigInteger BI_EB = BigInteger.valueOf(EB);
/** 1EB BigDecimal */
public static final BigDecimal BD_EB = BigDecimal.valueOf(EB);
/** 1ZB BigInteger */
public static final BigInteger BI_ZB = BigInteger.valueOf(KB).multiply(BI_EB);
/** 1ZB BigDecimal */
public static final BigDecimal BD_ZB = BigDecimal.valueOf(KB).multiply(BD_EB);
/** 1YB BigInteger */
public static final BigInteger BI_YB = BI_ZB.multiply(BI_KB);
/** 1YB BigDecimal */
public static final BigDecimal BD_YB = BD_ZB.multiply(BD_KB);
/** Reusable Long constant for zero. */
public static final Long LONG_ZERO = Long.valueOf(0L);
/** Reusable Long constant for one. */
public static final Long LONG_ONE = Long.valueOf(1L);
/** Reusable Long constant for minus one. */
public static final Long LONG_MINUS_ONE = Long.valueOf(-1L);
/** Reusable Integer constant for zero. */
public static final Integer INTEGER_ZERO = Integer.valueOf(0);
/** Reusable Integer constant for one. */
public static final Integer INTEGER_ONE = Integer.valueOf(1);
/** Reusable Integer constant for minus one. */
public static final Integer INTEGER_MINUS_ONE = Integer.valueOf(-1);
/** Reusable Short constant for zero. */
public static final Short SHORT_ZERO = Short.valueOf((short) 0);
/** Reusable Short constant for one. */
public static final Short SHORT_ONE = Short.valueOf((short) 1);
/** Reusable Short constant for minus one. */
public static final Short SHORT_MINUS_ONE = Short.valueOf((short) -1);
/** Reusable Byte constant for zero. */
public static final Byte BYTE_ZERO = Byte.valueOf((byte) 0);
/** Reusable Byte constant for one. */
public static final Byte BYTE_ONE = Byte.valueOf((byte) 1);
/** Reusable Byte constant for minus one. */
public static final Byte BYTE_MINUS_ONE = Byte.valueOf((byte) -1);
/** Reusable Double constant for zero. */
public static final Double DOUBLE_ZERO = Double.valueOf(0.0d);
/** Reusable Double constant for one. */
public static final Double DOUBLE_ONE = Double.valueOf(1.0d);
/** Reusable Double constant for minus one. */
public static final Double DOUBLE_MINUS_ONE = Double.valueOf(-1.0d);
/** Reusable Float constant for zero. */
public static final Float FLOAT_ZERO = Float.valueOf(0.0f);
/** Reusable Float constant for one. */
public static final Float FLOAT_ONE = Float.valueOf(1.0f);
/** Reusable Float constant for minus one. */
public static final Float FLOAT_MINUS_ONE = Float.valueOf(-1.0f);
public static DecimalFormat COMMA_FORMAT = new DecimalFormat("#,###");
//----------------------------------------------------------------
public static String toCommaString(Number n) {
if (n == null) {
return null;
}
return COMMA_FORMAT.format(n);
}
public static String toCommaString(short n) {
return COMMA_FORMAT.format(n);
}
public static String toCommaString(int n) {
return COMMA_FORMAT.format(n);
}
public static String toCommaString(long n) {
return COMMA_FORMAT.format(n);
}
//----------------------------------------------------------------
public static byte defaultByte(Number n) {
return n == null ? 0 : n.byteValue();
}
public static byte defaultByte(Number n, byte d) {
return n == null ? d : n.byteValue();
}
public static short defaultShort(Number n) {
return n == null ? 0 : n.shortValue();
}
public static short defaultShort(Number n, short d) {
return n == null ? d : n.shortValue();
}
public static int defaultInt(Number n) {
return n == null ? 0 : n.intValue();
}
public static int defaultInt(Number n, int d) {
return n == null ? d : n.intValue();
}
public static long defaultLong(Number n) {
return n == null ? 0 : n.longValue();
}
public static long defaultLong(Number n, long d) {
return n == null ? d : n.longValue();
}
public static float defaultFloat(Number n) {
return n == null ? 0 : n.floatValue();
}
public static float defaultFloat(Number n, float f) {
return n == null ? f : n.floatValue();
}
public static double defaultDouble(Number n) {
return n == null ? 0 : n.doubleValue();
}
public static double defaultDouble(Number n, double d) {
return n == null ? d : n.doubleValue();
}
//----------------------------------------------------------------
/**
*
* Checks if the value can safely be converted to a byte primitive.
*
*
* @param value The value validation is being performed on.
* @return true if the value can be converted to a Byte.
*/
public static boolean isByte(String value) {
return (toByte(value) != null);
}
/**
*
* Checks if the value can safely be converted to a short primitive.
*
*
* @param value The value validation is being performed on.
* @return true if the value can be converted to a Short.
*/
public static boolean isShort(String value) {
return (toShort(value) != null);
}
/**
*
* Checks if the value can safely be converted to a int primitive.
*
*
* @param value The value validation is being performed on.
* @return true if the value can be converted to an Integer.
*/
public static boolean isInt(String value) {
return (toInt(value) != null);
}
/**
*
* Checks if the value can safely be converted to a long primitive.
*
*
* @param value The value validation is being performed on.
* @return true if the value can be converted to a Long.
*/
public static boolean isLong(String value) {
return (toLong(value) != null);
}
/**
*
* Checks if the value can safely be converted to a float primitive.
*
*
* @param value The value validation is being performed on.
* @return true if the value can be converted to a Float.
*/
public static boolean isFloat(String value) {
return (toFloat(value) != null);
}
/**
*
* Checks if the value can safely be converted to a double primitive.
*
*
* @param value The value validation is being performed on.
* @return true if the value can be converted to a Double.
*/
public static boolean isDouble(String value) {
return (toDouble(value) != null);
}
public static Integer toInt(Number num) {
return (num == null ? null : num.intValue());
}
/**
*
* Convert a String to an int, returning zero if the
* conversion fails.
*
*
* If the string is null, null is returned.
*
*
*
* Numbers.toInt(null) = null
* Numbers.toInt("") = null
* Numbers.toInt("1") = 1
*
*
* @param str the string to convert, may be null
* @return the int represented by the string, or null if conversion fails
*/
public static Integer toInt(String str) {
return toInt(str, null);
}
/**
*
* Convert a String to an int, returning a default value if the
* conversion fails.
*
*
* If the string is null, the default value is returned.
*
*
*
* Numbers.toInt(null, 1) = 1
* Numbers.toInt("", 1) = 1
* Numbers.toInt("1", 0) = 1
*
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the int represented by the string, or the default if conversion fails
*/
public static Integer toInt(String str, Integer defaultValue) {
if (str == null) {
return defaultValue;
}
try {
return createInteger(str);
}
catch (NumberFormatException nfe) {
return defaultValue;
}
}
public static Long toLong(Number num) {
return (num == null ? null : num.longValue());
}
/**
*
* Convert a String to a long, returning null if the
* conversion fails.
*
*
* If the string is null, null is returned.
*
*
*
* Numbers.toLong(null) = null
* Numbers.toLong("") = null
* Numbers.toLong("1") = 1L
*
*
* @param str the string to convert, may be null
* @return the long represented by the string, or null if conversion fails
*/
public static Long toLong(String str) {
return toLong(str, null);
}
/**
*
* Convert a String to a long, returning a default value if the
* conversion fails.
*
*
* If the string is null, the default value is returned.
*
*
*
* Numbers.toLong(null, 1L) = 1L
* Numbers.toLong("", 1L) = 1L
* Numbers.toLong("1", 0L) = 1L
*
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the long represented by the string, or the default if conversion fails
*/
public static Long toLong(String str, Long defaultValue) {
if (str == null) {
return defaultValue;
}
try {
return createLong(str);
}
catch (NumberFormatException nfe) {
return defaultValue;
}
}
public static Float toFloat(Number num) {
return (num == null ? null : num.floatValue());
}
/**
*
* Convert a String to a float, returning null if the
* conversion fails.
*
*
* If the string is null, null is returned.
*
*
*
* Numbers.toFloat(null) = null
* Numbers.toFloat("") = null
* Numbers.toFloat("1.5") = 1.5f
*
*
* @param str the string to convert, may be null
* @return the float represented by the string, or null if conversion fails
*/
public static Float toFloat(String str) {
return toFloat(str, null);
}
/**
*
* Convert a String to a float, returning a default value if the
* conversion fails.
*
*
* If the string str is null, the default value is returned.
*
*
*
* Numbers.toFloat(null, 1.1f) = 1.0f
* Numbers.toFloat("", 1.1f) = 1.1f
* Numbers.toFloat("1.5", 0.0f) = 1.5f
*
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the float represented by the string, or defaultValue if conversion fails
*/
public static Float toFloat(String str, Float defaultValue) {
if (str == null) {
return defaultValue;
}
try {
return createFloat(str);
}
catch (NumberFormatException nfe) {
return defaultValue;
}
}
public static Double toDouble(Number num) {
return (num == null ? null : num.doubleValue());
}
/**
*
* Convert a String to a double, returning null if the
* conversion fails.
*
*
* If the string is null, null is returned.
*
*
*
* Numbers.toDouble(null) = null
* Numbers.toDouble("") = null
* Numbers.toDouble("1.5") = 1.5d
*
*
* @param str the string to convert, may be null
* @return the double represented by the string, or null if conversion fails
*/
public static Double toDouble(String str) {
return toDouble(str, null);
}
/**
*
* Convert a String to a double, returning a default value if the
* conversion fails.
*
*
* If the string str is null, the default value is returned.
*
*
*
* Numbers.toDouble(null, 1.1d) = 1.1d
* Numbers.toDouble("", 1.1d) = 1.1d
* Numbers.toDouble("1.5", 0.0d) = 1.5d
*
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the double represented by the string, or defaultValue if conversion fails
*/
public static Double toDouble(String str, Double defaultValue) {
if (str == null) {
return defaultValue;
}
try {
return createDouble(str);
}
catch (NumberFormatException nfe) {
return defaultValue;
}
}
public static BigDecimal toBigDecimal(Number num) {
return (num == null ? null : (num instanceof BigDecimal ? (BigDecimal)num : BigDecimal.valueOf(num.doubleValue())));
}
/**
*
* Convert a String to a BigDecimal, returning null if the
* conversion fails.
*
*
* If the string is null, null is returned.
*
*
*
* Numbers.toBigDecimal(null) = null
* Numbers.toBigDecimal("") = null
* Numbers.toBigDecimal("1.5") = 1.5d
*
*
* @param str the string to convert, may be null
* @return the double represented by the string, or null if conversion fails
*/
public static BigDecimal toBigDecimal(String str) {
return toBigDecimal(str, null);
}
/**
*
* Convert a String to a BigDecimal, returning a default value if the
* conversion fails.
*
*
* If the string str is null, the default value is returned.
*
*
*
* Numbers.toBigDecimal(null, 1.1d) = 1.1d
* Numbers.toBigDecimal("", 1.1d) = 1.1d
* Numbers.toBigDecimal("1.5", 0.0d) = 1.5d
*
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the double represented by the string, or defaultValue if conversion fails
*/
public static BigDecimal toBigDecimal(String str, BigDecimal defaultValue) {
if (Strings.isEmpty(str)) {
return defaultValue;
}
try {
return new BigDecimal(str);
}
catch (NumberFormatException nfe) {
return defaultValue;
}
}
/**
*
* Convert a String to a BigDecimal, returning null if the
* conversion fails.
*
*
* If the string is null, null is returned.
*
*
*
* Numbers.toBigDecimal(null) = null
* Numbers.toBigDecimal("") = null
* Numbers.toBigDecimal("1.5") = 1.5d
*
*
* @param num the double number to convert, may be null
* @return the double represented by the string, or null if conversion fails
*/
public static BigDecimal toBigDecimal(double num) {
return toBigDecimal(num, null);
}
/**
*
* Convert a String to a BigDecimal, returning a default value if the
* conversion fails.
*
*
* If the string str is null, the default value is returned.
*
*
*
* Numbers.toBigDecimal(null, 1.1d) = 1.1d
* Numbers.toBigDecimal("", 1.1d) = 1.1d
* Numbers.toBigDecimal("1.5", 0.0d) = 1.5d
*
*
* @param num the double number to convert, may be null
* @param defaultValue the default value
* @return the double represented by the string, or defaultValue if conversion fails
*/
public static BigDecimal toBigDecimal(double num, BigDecimal defaultValue) {
if (num == Double.NaN) {
return defaultValue;
}
try {
return BigDecimal.valueOf(num);
}
catch (NumberFormatException nfe) {
return defaultValue;
}
}
public static BigInteger toBigInteger(Number num) {
return (num == null ? null : (num instanceof BigInteger ? (BigInteger)num : BigInteger.valueOf(num.longValue())));
}
/**
*
* Convert a String to a BigInteger, returning null if the
* conversion fails.
*
*
* If the string is null, null is returned.
*
*
*
* Numbers.toBigInteger(null) = null
* Numbers.toBigInteger("") = null
* Numbers.toBigInteger("15") = 15L
*
*
* @param str the string to convert, may be null
* @return the double represented by the string, or null if conversion fails
*/
public static BigInteger toBigInteger(String str) {
return toBigInteger(str, null);
}
/**
*
* Convert a String to a BigInteger, returning a default value if the
* conversion fails.
*
*
* If the string str is null, the default value is returned.
*
*
*
* Numbers.toBigInteger(null, 1.1d) = 1.1d
* Numbers.toBigInteger("", 1.1d) = 1.1d
* Numbers.toBigInteger("1.5", 0.0d) = 1.5d
*
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the double represented by the string, or defaultValue if conversion fails
*/
public static BigInteger toBigInteger(String str, BigInteger defaultValue) {
if (str == null) {
return defaultValue;
}
try {
return createBigInteger(str);
}
catch (NumberFormatException nfe) {
return defaultValue;
}
}
/**
*
* Convert a String to a BigInteger, returning null if the
* conversion fails.
*
*
* If the string is null, null is returned.
*
*
*
* Numbers.toBigInteger(null) = null
* Numbers.toBigInteger("") = null
* Numbers.toBigInteger("15") = 15L
*
*
* @param num the double number to convert, may be null
* @return the double represented by the string, or null if conversion fails
*/
public static BigInteger toBigInteger(long num) {
return toBigInteger(num, null);
}
/**
*
* Convert a String to a BigInteger, returning a default value if the
* conversion fails.
*
*
* If the string str is null, the default value is returned.
*
*
*
* Numbers.toBigInteger(null, 11L) = 11L
* Numbers.toBigInteger("", 11L) = 11L
* Numbers.toBigInteger("15", 0L) = 15L
*
*
* @param num the double number to convert, may be null
* @param defaultValue the default value
* @return the double represented by the string, or defaultValue if conversion fails
*/
public static BigInteger toBigInteger(long num, BigInteger defaultValue) {
if (num == Double.NaN) {
return defaultValue;
}
try {
return BigInteger.valueOf(num);
}
catch (NumberFormatException nfe) {
return defaultValue;
}
}
// -----------------------------------------------------------------------
/**
*
* Convert a String to a byte, returning null if the
* conversion fails.
*
*
* If the string is null, null is returned.
*
*
*
* Numbers.toByte(null) = null
* Numbers.toByte("") = null
* Numbers.toByte("1") = 1
*
*
* @param str the string to convert, may be null
* @return the byte represented by the string, or null if conversion fails
*/
public static Byte toByte(String str) {
return toByte(str, null);
}
/**
*
* Convert a String to a byte, returning a default value if the
* conversion fails.
*
*
* If the string is null, the default value is returned.
*
*
*
* Numbers.toByte(null, 1) = 1
* Numbers.toByte("", 1) = 1
* Numbers.toByte("1", 0) = 1
*
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the byte represented by the string, or the default if conversion fails
*/
public static Byte toByte(String str, Byte defaultValue) {
if (str == null) {
return defaultValue;
}
try {
return Byte.parseByte(str);
}
catch (NumberFormatException nfe) {
return defaultValue;
}
}
/**
*
* Convert a String to a short, returning null if the
* conversion fails.
*
*
* If the string is null, null is returned.
*
*
*
* Numbers.toShort(null) = null
* Numbers.toShort("") = null
* Numbers.toShort("1") = 1
*
*
* @param str the string to convert, may be null
* @return the short represented by the string, or null if conversion fails
*/
public static Short toShort(String str) {
return toShort(str, null);
}
/**
*
* Convert a String to an short, returning a default value if the
* conversion fails.
*
*
* If the string is null, the default value is returned.
*
*
*
* Numbers.toShort(null, 1) = 1
* Numbers.toShort("", 1) = 1
* Numbers.toShort("1", 0) = 1
*
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the short represented by the string, or the default if conversion fails
*/
public static Short toShort(String str, Short defaultValue) {
if (str == null) {
return defaultValue;
}
try {
return createShort(str);
}
catch (NumberFormatException nfe) {
return defaultValue;
}
}
/**
*
* Convert a String to a Number, returning null if the
* conversion fails.
*
*
* If the string is null, null is returned.
*
*
*
* Numbers.toNumber(null) = null
* Numbers.toNumber("") = null
* Numbers.toNumber("1") = 1
*
*
* @param str the string to convert, may be null
* @return the short represented by the string, or null if conversion fails
*/
public static Number toNumber(String str) {
return toNumber(str, null);
}
/**
*
* Convert a String to an Number, returning a default value if the
* conversion fails.
*
*
* If the string is null, the default value is returned.
*
*
*
* Numbers.toNumber(null, 1) = 1
* Numbers.toNumber("", 1) = 1
* Numbers.toNumber("1", 0) = 1
*
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the short represented by the string, or the default if conversion fails
*/
public static Number toNumber(String str, Number defaultValue) {
if (str == null) {
return defaultValue;
}
try {
return createNumber(str);
}
catch (NumberFormatException nfe) {
return defaultValue;
}
}
// -----------------------------------------------------------------------
// must handle Long, Float, Integer, Float, Short,
// BigDecimal, BigInteger and Byte
// useful methods:
// Byte.decode(String)
// Byte.valueOf(String,int radix)
// Byte.valueOf(String)
// Double.valueOf(String)
// Float.valueOf(String)
// Float.valueOf(String)
// Integer.valueOf(String,int radix)
// Integer.valueOf(String)
// Integer.decode(String)
// Integer.getInteger(String)
// Integer.getInteger(String,int val)
// Integer.getInteger(String,Integer val)
// Integer.valueOf(String)
// Double.valueOf(String)
// new Byte(String)
// Long.valueOf(String)
// Long.getLong(String)
// Long.getLong(String,int)
// Long.getLong(String,Integer)
// Long.valueOf(String,int)
// Long.valueOf(String)
// Short.valueOf(String)
// Short.decode(String)
// Short.valueOf(String,int)
// Short.valueOf(String)
// new BigDecimal(String)
// new BigInteger(String)
// new BigInteger(String,int radix)
// Possible inputs:
// 45 45.5 45E7 4.5E7 Hex Oct Binary xxxF xxxD xxxf xxxd
// plus minus everything. Prolly more. A lot are not separable.
/**
*
* Turns a string value into a java.lang.Number.
*
*
*
* First, the value is examined for a type qualifier on the end (
* 'f','F','d','D','l','L'). If it is found, it starts trying
* to create successively larger types from the type specified until one is
* found that can represent the value.
*
*
*
* If a type specifier is not found, it will check for a decimal point and
* then try successively larger types from Integer to
* BigInteger and from Float to
* BigDecimal.
*
*
*
* If the string starts with 0x or -0x (lower or
* upper case), it will be interpreted as a hexadecimal integer. Values with
* leading 0's will not be interpreted as octal.
*
*
*
* Returns null if the string is null.
*
*
*
* This method does not trim the input string, i.e., strings with leading or
* trailing spaces will generate NumberFormatExceptions.
*
*
* @param str
* String containing a number, may be null
* @return Number created from the string (or null if the input is null)
* @throws NumberFormatException
* if the value cannot be converted
*/
public static Number createNumber(String str) throws NumberFormatException {
if (str == null) {
return null;
}
if (Strings.isBlank(str)) {
throw new NumberFormatException("A blank string is not a valid number");
}
// Need to deal with all possible hex prefixes here
final String[] hex_prefixes = { "0x", "0X", "-0x", "-0X", "#", "-#" };
int pfxLen = 0;
for (final String pfx : hex_prefixes) {
if (str.startsWith(pfx)) {
pfxLen += pfx.length();
break;
}
}
if (pfxLen > 0) { // we have a hex number
char firstSigDigit = 0; // strip leading zeroes
for (int i = pfxLen; i < str.length(); i++) {
firstSigDigit = str.charAt(i);
if (firstSigDigit == '0') { // count leading zeroes
pfxLen++;
}
else {
break;
}
}
final int hexDigits = str.length() - pfxLen;
if (hexDigits > 16 || (hexDigits == 16 && firstSigDigit > '7')) { // too many for Long
return createBigInteger(str);
}
if (hexDigits > 8 || (hexDigits == 8 && firstSigDigit > '7')) { // too many for an int
return createLong(str);
}
return createInteger(str);
}
final char lastChar = str.charAt(str.length() - 1);
String mant;
String dec;
String exp;
final int decPos = str.indexOf('.');
final int expPos = str.indexOf('e') + str.indexOf('E') + 1; // assumes both not present
// if both e and E are present, this is caught by the checks on expPos (which prevent IOOBE)
// and the parsing which will detect if e or E appear in a number due to using the wrong
// offset
int numDecimals = 0; // Check required precision (LANG-693)
if (decPos > -1) { // there is a decimal point
if (expPos > -1) { // there is an exponent
if (expPos < decPos || expPos > str.length()) { // prevents double exponent causing
// IOOBE
throw new NumberFormatException(str + " is not a valid number.");
}
dec = str.substring(decPos + 1, expPos);
}
else {
dec = str.substring(decPos + 1);
}
mant = str.substring(0, decPos);
numDecimals = dec.length(); // gets number of digits past the decimal to ensure no loss
// of precision for floating point numbers.
}
else {
if (expPos > -1) {
if (expPos > str.length()) { // prevents double exponent causing IOOBE
throw new NumberFormatException(str + " is not a valid number.");
}
mant = str.substring(0, expPos);
}
else {
mant = str;
}
dec = null;
}
if (!Character.isDigit(lastChar) && lastChar != '.') {
if (expPos > -1 && expPos < str.length() - 1) {
exp = str.substring(expPos + 1, str.length() - 1);
}
else {
exp = null;
}
// Requesting a specific type..
final String numeric = str.substring(0, str.length() - 1);
final boolean allZeros = isAllZeros(mant) && isAllZeros(exp);
switch (lastChar) {
case 'l':
case 'L':
if (dec == null && exp == null
&& (numeric.charAt(0) == '-' && isDigits(numeric.substring(1)) || isDigits(numeric))) {
try {
return createLong(numeric);
}
catch (final NumberFormatException nfe) { // NOPMD
// Too big for a long
}
return createBigInteger(numeric);
}
throw new NumberFormatException(str + " is not a valid number.");
case 'f':
case 'F':
try {
final Float f = createFloat(numeric);
if (!(f.isInfinite() || (f.floatValue() == 0.0F && !allZeros))) {
// If it's too big for a float or the float value = 0 and the string
// has non-zeros in it, then float does not have the precision we want
return f;
}
}
catch (final NumberFormatException nfe) { // NOPMD
// ignore the bad number
}
//$FALL-THROUGH$
case 'd':
case 'D':
try {
final Double d = createDouble(numeric);
if (!(d.isInfinite() || (d.floatValue() == 0.0D && !allZeros))) {
return d;
}
}
catch (final NumberFormatException nfe) { // NOPMD
// ignore the bad number
}
try {
return createBigDecimal(numeric);
}
catch (final NumberFormatException e) { // NOPMD
// ignore the bad number
}
//$FALL-THROUGH$
default:
throw new NumberFormatException(str + " is not a valid number.");
}
}
// User doesn't have a preference on the return type, so let's start
// small and go from there...
if (expPos > -1 && expPos < str.length() - 1) {
exp = str.substring(expPos + 1, str.length());
}
else {
exp = null;
}
if (dec == null && exp == null) { // no decimal point and no exponent
// Must be an Integer, Long, Biginteger
try {
return createInteger(str);
}
catch (final NumberFormatException nfe) { // NOPMD
// ignore the bad number
}
try {
return createLong(str);
}
catch (final NumberFormatException nfe) { // NOPMD
// ignore the bad number
}
return createBigInteger(str);
}
// Must be a Float, Double, BigDecimal
final boolean allZeros = isAllZeros(mant) && isAllZeros(exp);
try {
if (numDecimals <= 7) {// If number has 7 or fewer digits past the decimal point then
// make it a float
final Float f = createFloat(str);
if (!(f.isInfinite() || (f.floatValue() == 0.0F && !allZeros))) {
return f;
}
}
}
catch (final NumberFormatException nfe) { // NOPMD
// ignore the bad number
}
try {
if (numDecimals <= 16) {// If number has between 8 and 16 digits past the decimal point
// then make it a double
final Double d = createDouble(str);
if (!(d.isInfinite() || (d.doubleValue() == 0.0D && !allZeros))) {
return d;
}
}
}
catch (final NumberFormatException nfe) { // NOPMD
// ignore the bad number
}
return createBigDecimal(str);
}
/**
*
* Returns true if s is null.
*
*
* @param str the String to check
* @return if it is all zeros or null
*/
public static boolean isAllZeros(String str) {
if (str == null) {
return true;
}
for (int i = str.length() - 1; i >= 0; i--) {
if (str.charAt(i) != '0') {
return false;
}
}
return str.length() > 0;
}
// -----------------------------------------------------------------------
/**
*
* Convert a String to a Float.
*
*
*
* Returns null if the string is null.
*
*
* @param str
* a String to convert, may be null
* @return converted Float
* @throws NumberFormatException
* if the value cannot be converted
*/
public static Float createFloat(String str) {
if (str == null) {
return null;
}
return Float.valueOf(str);
}
/**
*
* Convert a String to a Double.
*
*
*
* Returns null if the string is null.
*
*
* @param str
* a String to convert, may be null
* @return converted Double
* @throws NumberFormatException
* if the value cannot be converted
*/
public static Double createDouble(String str) {
if (str == null) {
return null;
}
return Double.valueOf(str);
}
/**
*
* Convert a String to a Byte, handling hex and
* octal notations.
*
*
*
* Returns null if the string is null.
*
*
* @param str
* a String to convert, may be null
* @return converted Integer
* @throws NumberFormatException
* if the value cannot be converted
*/
public static Byte createByte(String str) {
if (str == null) {
return null;
}
// decode() handles 0xAABD and 0777 (hex and octal) as well.
return Byte.decode(str);
}
/**
*
* Convert a String to a Integer, handling hex and
* octal notations.
*
*
*
* Returns null if the string is null.
*
*
* @param str
* a String to convert, may be null
* @return converted Integer
* @throws NumberFormatException
* if the value cannot be converted
*/
public static Short createShort(String str) {
if (str == null) {
return null;
}
// decode() handles 0xAABD and 0777 (hex and octal) as well.
return Short.decode(str);
}
/**
*
* Convert a String to a Integer, handling hex and
* octal notations.
*
*
*
* Returns null if the string is null.
*
*
* @param str
* a String to convert, may be null
* @return converted Integer
* @throws NumberFormatException
* if the value cannot be converted
*/
public static Integer createInteger(String str) {
if (str == null) {
return null;
}
// decode() handles 0xAABD and 0777 (hex and octal) as well.
return Integer.decode(str);
}
/**
*
* Convert a String to a Long; since 3.1 it
* handles hex and octal notations.
*
*
*
* Returns null if the string is null.
*
*
* @param str
* a String to convert, may be null
* @return converted Long
* @throws NumberFormatException
* if the value cannot be converted
*/
public static Long createLong(String str) {
if (str == null) {
return null;
}
return Long.decode(str);
}
/**
*
* Convert a String to a BigInteger.
*
*
*
* Returns null if the string is null.
*
*
* @param str
* a String to convert, may be null
* @return converted BigInteger
* @throws NumberFormatException
* if the value cannot be converted
*/
public static BigInteger createBigInteger(String str) {
if (str == null) {
return null;
}
int pos = 0; // offset within string
int radix = 10;
boolean negate = false; // need to negate later?
if (str.startsWith("-")) {
negate = true;
pos = 1;
}
if (str.startsWith("0x", pos) || str.startsWith("0x", pos)) { // hex
radix = 16;
pos += 2;
}
else if (str.startsWith("#", pos)) { // alternative hex (allowed by Long/Integer)
radix = 16;
pos++;
}
else if (str.startsWith("0", pos) && str.length() > pos + 1) { // octal; so long as there
// are additional digits
radix = 8;
pos++;
} // default is to treat as decimal
final BigInteger value = new BigInteger(str.substring(pos), radix);
return negate ? value.negate() : value;
}
/**
*
* Convert a String to a BigDecimal.
*
*
*
* Returns null if the string is null.
*
*
* @param str
* a String to convert, may be null
* @return converted BigDecimal
* @throws NumberFormatException
* if the value cannot be converted
*/
public static BigDecimal createBigDecimal(String str) {
if (str == null) {
return null;
}
// handle JDK1.3.1 bug where "" throws IndexOutOfBoundsException
if (Strings.isBlank(str)) {
throw new NumberFormatException(
"A blank string is not a valid number");
}
return new BigDecimal(str);
}
/**
* Checks if the specified array is neither null nor empty.
*
* @param array the array to check
* @throws IllegalArgumentException if {@code array} is either {@code null} or empty
*/
private static void validateArray(final Object array) {
if (array == null) {
throw new IllegalArgumentException("The Array must not be null");
}
if (Array.getLength(array) == 0) {
throw new IllegalArgumentException("Array cannot be empty.");
}
}
// Min in array
// --------------------------------------------------------------------
/**
*
* Returns the minimum value in an array.
*
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws IllegalArgumentException if array is null
* @throws IllegalArgumentException if array is empty
*/
public static long min(final long... array) {
validateArray(array);
// Finds and returns min
long min = array[0];
for (int i = 1; i < array.length; i++) {
if (array[i] < min) {
min = array[i];
}
}
return min;
}
/**
*
* Returns the minimum value in an array.
*
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws IllegalArgumentException if array is null
* @throws IllegalArgumentException if array is empty
*/
public static int min(final int... array) {
validateArray(array);
// Finds and returns min
int min = array[0];
for (int j = 1; j < array.length; j++) {
if (array[j] < min) {
min = array[j];
}
}
return min;
}
/**
*
* Returns the minimum value in an array.
*
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws IllegalArgumentException if array is null
* @throws IllegalArgumentException if array is empty
*/
public static short min(final short... array) {
validateArray(array);
// Finds and returns min
short min = array[0];
for (int i = 1; i < array.length; i++) {
if (array[i] < min) {
min = array[i];
}
}
return min;
}
/**
*
* Returns the minimum value in an array.
*
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws IllegalArgumentException if array is null
* @throws IllegalArgumentException if array is empty
*/
public static byte min(final byte ... array) {
validateArray(array);
// Finds and returns min
byte min = array[0];
for (int i = 1; i < array.length; i++) {
if (array[i] < min) {
min = array[i];
}
}
return min;
}
/**
*
* Returns the minimum value in an array.
*
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws IllegalArgumentException if array is null
* @throws IllegalArgumentException if array is empty
*/
public static double min(final double... array) {
validateArray(array);
// Finds and returns min
double min = array[0];
for (int i = 1; i < array.length; i++) {
if (Double.isNaN(array[i])) {
return Double.NaN;
}
if (array[i] < min) {
min = array[i];
}
}
return min;
}
/**
*
* Returns the minimum value in an array.
*
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws IllegalArgumentException if array is null
* @throws IllegalArgumentException if array is empty
*/
public static float min(final float... array) {
validateArray(array);
// Finds and returns min
float min = array[0];
for (int i = 1; i < array.length; i++) {
if (Float.isNaN(array[i])) {
return Float.NaN;
}
if (array[i] < min) {
min = array[i];
}
}
return min;
}
// Max in array
// --------------------------------------------------------------------
/**
*
* Returns the maximum value in an array.
*
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws IllegalArgumentException if array is null
* @throws IllegalArgumentException if array is empty
*/
public static long max(final long... array) {
validateArray(array);
// Finds and returns max
long max = array[0];
for (int j = 1; j < array.length; j++) {
if (array[j] > max) {
max = array[j];
}
}
return max;
}
/**
*
* Returns the maximum value in an array.
*
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws IllegalArgumentException if array is null
* @throws IllegalArgumentException if array is empty
*/
public static int max(final int... array) {
validateArray(array);
// Finds and returns max
int max = array[0];
for (int j = 1; j < array.length; j++) {
if (array[j] > max) {
max = array[j];
}
}
return max;
}
/**
*
* Returns the maximum value in an array.
*
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws IllegalArgumentException if array is null
* @throws IllegalArgumentException if array is empty
*/
public static short max(final short... array) {
validateArray(array);
// Finds and returns max
short max = array[0];
for (int i = 1; i < array.length; i++) {
if (array[i] > max) {
max = array[i];
}
}
return max;
}
/**
*
* Returns the maximum value in an array.
*
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws IllegalArgumentException if array is null
* @throws IllegalArgumentException if array is empty
*/
public static byte max(final byte... array) {
validateArray(array);
// Finds and returns max
byte max = array[0];
for (int i = 1; i < array.length; i++) {
if (array[i] > max) {
max = array[i];
}
}
return max;
}
/**
*
* Returns the maximum value in an array.
*
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws IllegalArgumentException if array is null
* @throws IllegalArgumentException if array is empty
*/
public static double max(final double... array) {
validateArray(array);
// Finds and returns max
double max = array[0];
for (int j = 1; j < array.length; j++) {
if (Double.isNaN(array[j])) {
return Double.NaN;
}
if (array[j] > max) {
max = array[j];
}
}
return max;
}
/**
*
* Returns the maximum value in an array.
*
*
* @param array an array, must not be null or empty
* @return the minimum value in the array
* @throws IllegalArgumentException if array is null
* @throws IllegalArgumentException if array is empty
*/
public static float max(final float... array) {
validateArray(array);
// Finds and returns max
float max = array[0];
for (int j = 1; j < array.length; j++) {
if (Float.isNaN(array[j])) {
return Float.NaN;
}
if (array[j] > max) {
max = array[j];
}
}
return max;
}
// 3 param min
// -----------------------------------------------------------------------
/**
*
* Gets the minimum of three long values.
*
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the smallest of the values
*/
public static long min(long a, long b, long c) {
if (b < a) {
a = b;
}
if (c < a) {
a = c;
}
return a;
}
/**
*
* Gets the minimum of three int values.
*
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the smallest of the values
*/
public static int min(int a, int b, int c) {
if (b < a) {
a = b;
}
if (c < a) {
a = c;
}
return a;
}
/**
*
* Gets the minimum of three short values.
*
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the smallest of the values
*/
public static short min(short a, short b, short c) {
if (b < a) {
a = b;
}
if (c < a) {
a = c;
}
return a;
}
/**
*
* Gets the minimum of three byte values.
*
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the smallest of the values
*/
public static byte min(byte a, byte b, byte c) {
if (b < a) {
a = b;
}
if (c < a) {
a = c;
}
return a;
}
/**
*
* Gets the minimum of three double values.
*
*
* If any value is NaN, NaN is returned. Infinity is handled.
*
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the smallest of the values
*/
public static double min(double a, double b, double c) {
return Math.min(Math.min(a, b), c);
}
/**
*
* Gets the minimum of three float values.
*
*
* If any value is NaN, NaN is returned. Infinity is handled.
*
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the smallest of the values
*/
public static float min(float a, float b, float c) {
return Math.min(Math.min(a, b), c);
}
// 3 param max
// -----------------------------------------------------------------------
/**
*
* Gets the maximum of three long values.
*
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the largest of the values
*/
public static long max(long a, long b, long c) {
if (b > a) {
a = b;
}
if (c > a) {
a = c;
}
return a;
}
/**
*
* Gets the maximum of three int values.
*
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the largest of the values
*/
public static int max(int a, int b, int c) {
if (b > a) {
a = b;
}
if (c > a) {
a = c;
}
return a;
}
/**
*
* Gets the maximum of three short values.
*
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the largest of the values
*/
public static short max(short a, short b, short c) {
if (b > a) {
a = b;
}
if (c > a) {
a = c;
}
return a;
}
/**
*
* Gets the maximum of three byte values.
*
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the largest of the values
*/
public static byte max(byte a, byte b, byte c) {
if (b > a) {
a = b;
}
if (c > a) {
a = c;
}
return a;
}
/**
*
* Gets the maximum of three double values.
*
*
* If any value is NaN, NaN is returned. Infinity is handled.
*
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the largest of the values
*/
public static double max(double a, double b, double c) {
return Math.max(Math.max(a, b), c);
}
/**
*
* Gets the maximum of three float values.
*
*
* If any value is NaN, NaN is returned. Infinity is handled.
*
*
* @param a value 1
* @param b value 2
* @param c value 3
* @return the largest of the values
*/
public static float max(float a, float b, float c) {
return Math.max(Math.max(a, b), c);
}
// -----------------------------------------------------------------------
public static int compare(Number n1, Number n2) {
return compare(n1, n2, false);
}
public static int compare(Number n1, Number n2, boolean nullGreater) {
if (n1 == n2) {
return 0;
}
if (n1 == null) {
return nullGreater ? 1 : -1;
}
if (n2 == null) {
return nullGreater ? -1 : 1;
}
return compare(n1.doubleValue(), n2.doubleValue());
}
/**
*
* Compares two doubles for order.
*
*
* This method is more comprehensive than the standard Java greater than, less than and equals
* operators.
*
*
* - It returns
-1 if the first value is less than the second.
* - It returns
+1 if the first value is greater than the second.
* - It returns
0 if the values are equal.
*
*
* The ordering is as follows, largest to smallest:
*
* - NaN
*
- Positive infinity
*
- Maximum double
*
- Normal positive numbers
*
- +0.0
*
- -0.0
*
- Normal negative numbers
*
- Minimum double (
-Double.MAX_VALUE)
* - Negative infinity
*
*
*
* Comparing NaN with NaN will return 0.
*
*
* @param lhs the first double
* @param rhs the second double
* @return -1 if lhs is less, +1 if greater, 0 if equal
* to rhs
*/
public static int compare(double lhs, double rhs) {
if (lhs < rhs) {
return -1;
}
if (lhs > rhs) {
return +1;
}
// Need to compare bits to handle 0.0 == -0.0 being true
// compare should put -0.0 < +0.0
// Two NaNs are also == for compare purposes
// where NaN == NaN is false
long lhsBits = Double.doubleToLongBits(lhs);
long rhsBits = Double.doubleToLongBits(rhs);
if (lhsBits == rhsBits) {
return 0;
}
// Something exotic! A comparison to NaN or 0.0 vs -0.0
// Fortunately NaN's long is > than everything else
// Also negzeros bits < poszero
// NAN: 9221120237041090560
// MAX: 9218868437227405311
// NEGZERO: -9223372036854775808
if (lhsBits < rhsBits) {
return -1;
}
else {
return +1;
}
}
/**
*
* Compares two floats for order.
*
*
* This method is more comprehensive than the standard Java greater than, less than and equals
* operators.
*
*
* - It returns
-1 if the first value is less than the second.
* - It returns
+1 if the first value is greater than the second.
* - It returns
0 if the values are equal.
*
*
* The ordering is as follows, largest to smallest:
*
* - NaN
*
- Positive infinity
*
- Maximum float
*
- Normal positive numbers
*
- +0.0
*
- -0.0
*
- Normal negative numbers
*
- Minimum float (
-Float.MAX_VALUE)
* - Negative infinity
*
*
* Comparing NaN with NaN will return 0.
*
*
* @param lhs the first float
* @param rhs the second float
* @return -1 if lhs is less, +1 if greater, 0 if equal
* to rhs
*/
public static int compare(float lhs, float rhs) {
if (lhs < rhs) {
return -1;
}
if (lhs > rhs) {
return +1;
}
// Need to compare bits to handle 0.0 == -0.0 being true
// compare should put -0.0 < +0.0
// Two NaNs are also == for compare purposes
// where NaN == NaN is false
int lhsBits = Float.floatToIntBits(lhs);
int rhsBits = Float.floatToIntBits(rhs);
if (lhsBits == rhsBits) {
return 0;
}
// Something exotic! A comparison to NaN or 0.0 vs -0.0
// Fortunately NaN's int is > than everything else
// Also negzeros bits < poszero
// NAN: 2143289344
// MAX: 2139095039
// NEGZERO: -2147483648
if (lhsBits < rhsBits) {
return -1;
}
else {
return +1;
}
}
// -----------------------------------------------------------------------
/**
*
* Checks whether the String contains only digit characters.
*
*
* Null and empty String will return false.
*
*
* @param str the String to check
* @return true if str contains only unicode numeric
*/
public static boolean isDigits(String str) {
if (Strings.isEmpty(str)) {
return false;
}
for (int i = 0; i < str.length(); i++) {
if (!Character.isDigit(str.charAt(i))) {
return false;
}
}
return true;
}
/**
*
* Checks whether the String a valid Java number.
*
*
* Valid numbers include hexadecimal marked with the 0x qualifier, scientific
* notation and numbers marked with a type qualifier (e.g. 123L).
*
*
* Null and empty String will return false.
*
*
* @param str the String to check
* @return true if the string is a correctly formatted number
*/
public static boolean isNumber(String str) {
if (Strings.isEmpty(str)) {
return false;
}
char[] chars = str.toCharArray();
int sz = chars.length;
boolean hasExp = false;
boolean hasDecPoint = false;
boolean allowSigns = false;
boolean foundDigit = false;
// deal with any possible sign up front
int start = (chars[0] == '-') ? 1 : 0;
if (sz > start + 1) {
if (chars[start] == '0' && chars[start + 1] == 'x') {
int i = start + 2;
if (i == sz) {
return false; // str == "0x"
}
// checking hex (it can't be anything else)
for (; i < chars.length; i++) {
if ((chars[i] < '0' || chars[i] > '9') && (chars[i] < 'a' || chars[i] > 'f')
&& (chars[i] < 'A' || chars[i] > 'F')) {
return false;
}
}
return true;
}
}
sz--; // don't want to loop to the last char, check it afterwords
// for type qualifiers
int i = start;
// loop to the next to last char or to the last char if we need another digit to
// make a valid number (e.g. chars[0..5] = "1234E")
while (i < sz || (i < sz + 1 && allowSigns && !foundDigit)) {
if (chars[i] >= '0' && chars[i] <= '9') {
foundDigit = true;
allowSigns = false;
}
else if (chars[i] == '.') {
if (hasDecPoint || hasExp) {
// two decimal points or dec in exponent
return false;
}
hasDecPoint = true;
}
else if (chars[i] == 'e' || chars[i] == 'E') {
// we've already taken care of hex.
if (hasExp) {
// two E's
return false;
}
if (!foundDigit) {
return false;
}
hasExp = true;
allowSigns = true;
}
else if (chars[i] == '+' || chars[i] == '-') {
if (!allowSigns) {
return false;
}
allowSigns = false;
foundDigit = false; // we need a digit after the E
}
else {
return false;
}
i++;
}
if (i < chars.length) {
if (chars[i] >= '0' && chars[i] <= '9') {
// no type qualifier, OK
return true;
}
if (chars[i] == 'e' || chars[i] == 'E') {
// can't have an E at the last byte
return false;
}
if (chars[i] == '.') {
if (hasDecPoint || hasExp) {
// two decimal points or dec in exponent
return false;
}
// single trailing decimal point after non-exponent is ok
return foundDigit;
}
if (!allowSigns
&& (chars[i] == 'd' || chars[i] == 'D' || chars[i] == 'f' || chars[i] == 'F')) {
return foundDigit;
}
if (chars[i] == 'l' || chars[i] == 'L') {
// not allowing L with an exponent or decimal point
return foundDigit && !hasExp && !hasDecPoint;
}
// last character is illegal
return false;
}
// allowSigns is true iff the val ends in 'E'
// found digit it to make sure weird stuff like '.' and '1E-' doesn't pass
return !allowSigns && foundDigit;
}
// -----------------------------------------------------------------------
private static final ThreadLocal DEFAULT_FORMAT = new ThreadLocal() {
@Override
protected DecimalFormat initialValue() {
DecimalFormat df = new DecimalFormat("#", new DecimalFormatSymbols(Locale.ENGLISH));
df.setMaximumFractionDigits(340);
return df;
}
};
/**
* @param n the number to format
* @return formatted number string
*/
public static String format(Number n) {
return DEFAULT_FORMAT.get().format(n);
}
/**
* decFormat(1.235, 2) -> 1.23
* decFormat(1.236, 2) -> 1.24
*
* @param n the number to format
* @param frac maximum fraction digits
* @return formatted number string
*/
public static String decFormat(Number n, int frac) {
DecimalFormat df = null;
df = new DecimalFormat("#", new DecimalFormatSymbols(Locale.ENGLISH));
df.setMaximumFractionDigits(frac);
return df.format(n);
}
/**
* decFormat(1.235, 2) -> 1.23
* decFormat(1.236, 2) -> 1.23
*
* @param n the number to format
* @param frac maximum fraction digits
* @return formatted number string
*/
public static String cutFormat(double n, int frac) {
boolean minus = false;
if (n < 0) {
minus = true;
n = -n;
}
long i = (long)n;
double d = n - i;
double p = Math.pow(10, frac);
double dp = d * p;
long f = (long)(dp);
if (f <= 0) {
return String.valueOf(i);
}
StringBuilder sb = new StringBuilder();
if (minus) {
sb.append('-');
};
sb.append(i)
.append('.')
.append(Strings.stripEnd(Strings.leftPad(String.valueOf(f), frac, '0'), '0'));
return sb.toString();
}
// -----------------------------------------------------------------------
private static String _formatSize(final double size) {
return cutFormat(size, 2);
}
/**
* Returns a human-readable version of the file size, where the input represents a specific
* number of bytes.
*
* If the size is over 1GB, the size is returned as the number of whole GB, i.e. the size is
* rounded down to the nearest GB boundary.
*
*
* Similarly for the 1MB and 1KB boundaries.
*
*
* @param size the number of bytes
* @return a human-readable display value (includes units - EB, PB, TB, GB, MB, KB or bytes)
*/
public static String formatSize(final BigInteger size) {
if (size == null) {
return Strings.EMPTY;
}
return formatSize(new BigDecimal(size));
}
/**
* Returns a human-readable version of the file size, where the input represents a specific
* number of bytes.
*
* If the size is over 1GB, the size is returned as the number of whole GB, i.e. the size is
* rounded down to the nearest GB boundary.
*
*
* Similarly for the 1MB and 1KB boundaries.
*
*
* @param size the number of bytes
* @return a human-readable display value (includes units - EB, PB, TB, GB, MB, KB or bytes)
*/
public static String formatSize(final BigDecimal size) {
if (size == null) {
return Strings.EMPTY;
}
String sz;
if (size.compareTo(Numbers.BD_YB) > 0) {
sz = _formatSize(size.divide(BD_YB).doubleValue()) + " YB";
}
else if (size.compareTo(BD_ZB) > 0) {
sz = _formatSize(size.divide(BD_ZB).doubleValue()) + " ZB";
}
else {
sz = formatSize(size.longValue());
}
return sz;
}
/**
* Returns a human-readable version of the file size, where the input represents a specific
* number of bytes.
*
* If the size is over 1GB, the size is returned as the number of whole GB, i.e. the size is
* rounded down to the nearest GB boundary.
*
*
* Similarly for the 1MB and 1KB boundaries.
*
*
* @param size the number of bytes
* @return a human-readable display value (includes units - EB, PB, TB, GB, MB, KB or bytes)
*/
public static String formatSize(final Number size) {
if (size == null) {
return Strings.EMPTY;
}
return formatSize(size.doubleValue());
}
/**
* Returns a human-readable version of the file size, where the input represents a specific
* number of bytes.
*
* If the size is over 1GB, the size is returned as the number of whole GB, i.e. the size is
* rounded down to the nearest GB boundary.
*
*
* Similarly for the 1MB and 1KB boundaries.
*
*
* @param size the number of bytes
* @return a human-readable display value (includes units - EB, PB, TB, GB, MB, KB or bytes)
*/
public static String formatSize(final long size) {
return formatSize((double)size);
}
/**
* Returns a human-readable version of the file size, where the input represents a specific
* number of bytes.
*
* If the size is over 1GB, the size is returned as the number of whole GB, i.e. the size is
* rounded down to the nearest GB boundary.
*
*
* Similarly for the 1MB and 1KB boundaries.
*
*
* @param size the number of bytes
* @return a human-readable display value (includes units - EB, PB, TB, GB, MB, KB or bytes)
*/
public static String formatSize(final double size) {
String sz;
if (size >= EB) {
sz = _formatSize(size / EB) + " EB";
}
else if (size >= PB) {
sz = _formatSize(size / PB) + " PB";
}
else if (size >= TB) {
sz = _formatSize(size / TB) + " TB";
}
else if (size >= GB) {
sz = _formatSize(size / GB) + " GB";
}
else if (size >= MB) {
sz = _formatSize(size / MB) + " MB";
}
else if (size >= KB) {
sz = _formatSize(size / KB) + " KB";
}
else {
sz = _formatSize(size) + " bytes";
}
return sz;
}
/**
* parse display size to number.
* return null if the input string is not a valid display size string.
*
* @param str display size string
* @return number
*/
public static BigDecimal parseSize(final String str) {
if (Strings.isEmpty(str)) {
return null;
}
int i = 0;
while (i < str.length() && !Character.isLetter(str.charAt(i))) {
i++;
}
BigDecimal n = toBigDecimal(Strings.strip(str.substring(0, i)));
if (n == null) {
return null;
}
if (i == str.length()) {
return n;
}
char unit = str.charAt(i);
switch (unit) {
case 'Y':
case 'y':
n = n.multiply(BD_YB);
break;
case 'Z':
case 'z':
n = n.multiply(BD_ZB);
break;
case 'E':
case 'e':
n = n.multiply(BD_EB);
break;
case 'P':
case 'p':
n = n.multiply(BD_PB);
break;
case 'T':
case 't':
n = n.multiply(BD_TB);
break;
case 'G':
case 'g':
n = n.multiply(BD_GB);
break;
case 'M':
case 'm':
n = n.multiply(BD_MB);
break;
case 'K':
case 'k':
n = n.multiply(BD_KB);
break;
}
return n;
}
}