| /* java.lang.Integer |
| Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package java.lang; |
| |
| /** |
| * Instances of class <code>Integer</code> represent primitive |
| * <code>int</code> values. |
| * |
| * Additionally, this class provides various helper functions and variables |
| * related to ints. |
| * |
| * @author Paul Fisher |
| * @author John Keiser |
| * @author Warren Levy |
| * @since JDK 1.0 |
| */ |
| public final class Integer extends Number implements Comparable |
| { |
| // compatible with JDK 1.0.2+ |
| private static final long serialVersionUID = 1360826667806852920L; |
| |
| /** |
| * The minimum value an <code>int</code> can represent is -2147483648. |
| */ |
| public static final int MIN_VALUE = 0x80000000; |
| |
| /** |
| * The maximum value an <code>int</code> can represent is 2147483647. |
| */ |
| public static final int MAX_VALUE = 0x7fffffff; |
| |
| /** |
| * The primitive type <code>int</code> is represented by this |
| * <code>Class</code> object. |
| */ |
| public static final Class TYPE = VMClassLoader.getPrimitiveClass ('I'); |
| |
| /** |
| * The immutable value of this Integer. |
| */ |
| private final int value; |
| |
| /** |
| * Create an <code>Integer</code> object representing the value of the |
| * <code>int</code> argument. |
| * |
| * @param value the value to use |
| */ |
| public Integer(int value) |
| { |
| this.value = value; |
| } |
| |
| /** |
| * Create an <code>Integer</code> object representing the value of the |
| * argument after conversion to an <code>int</code>. |
| * |
| * @param s the string to convert. |
| */ |
| public Integer(String s) throws NumberFormatException |
| { |
| value = parseInt(s, 10); |
| } |
| |
| /** |
| * Return a hashcode representing this Object. |
| * |
| * <code>Integer</code>'s hash code is calculated by simply returning its |
| * value. |
| * |
| * @return this Object's hash code. |
| */ |
| public int hashCode() |
| { |
| return value; |
| } |
| |
| /** |
| * If the <code>Object</code> is not <code>null</code>, is an |
| * <code>instanceof</code> <code>Integer</code>, and represents |
| * the same primitive <code>int</code> value return |
| * <code>true</code>. Otherwise <code>false</code> is returned. |
| */ |
| public boolean equals(Object obj) |
| { |
| return obj instanceof Integer && value == ((Integer)obj).value; |
| } |
| |
| /** |
| * Get the specified system property as an <code>Integer</code>. |
| * |
| * The <code>decode()</code> method will be used to interpret the value of |
| * the property. |
| * @param nm the name of the system property |
| * @return the system property as an <code>Integer</code>, or |
| * <code>null</code> if the property is not found or cannot be |
| * decoded as an <code>Integer</code>. |
| * @see java.lang.System#getProperty(java.lang.String) |
| * @see #decode(int) |
| */ |
| public static Integer getInteger(String nm) |
| { |
| return getInteger(nm, null); |
| } |
| |
| /** |
| * Get the specified system property as an <code>Integer</code>, or use a |
| * default <code>int</code> value if the property is not found or is not |
| * decodable. |
| * |
| * The <code>decode()</code> method will be used to interpret the value of |
| * the property. |
| * |
| * @param nm the name of the system property |
| * @param val the default value to use if the property is not found or not |
| * a number. |
| * @return the system property as an <code>Integer</code>, or the default |
| * value if the property is not found or cannot be decoded as an |
| * <code>Integer</code>. |
| * @see java.lang.System#getProperty(java.lang.String) |
| * @see #decode(int) |
| * @see #getInteger(java.lang.String,java.lang.Integer) |
| */ |
| public static Integer getInteger(String nm, int val) |
| { |
| Integer result = getInteger(nm, null); |
| return (result == null) ? new Integer(val) : result; |
| } |
| |
| /** |
| * Get the specified system property as an <code>Integer</code>, or use a |
| * default <code>Integer</code> value if the property is not found or is |
| * not decodable. |
| * |
| * The <code>decode()</code> method will be used to interpret the value of |
| * the property. |
| * |
| * @param nm the name of the system property |
| * @param val the default value to use if the property is not found or not |
| * a number. |
| * @return the system property as an <code>Integer</code>, or the default |
| * value if the property is not found or cannot be decoded as an |
| * <code>Integer</code>. |
| * @see java.lang.System#getProperty(java.lang.String) |
| * @see #decode(int) |
| * @see #getInteger(java.lang.String,int) |
| */ |
| public static Integer getInteger(String nm, Integer def) |
| { |
| if (nm == null || "".equals(nm)) |
| return def; |
| nm = System.getProperty(nm); |
| if (nm == null) return def; |
| try |
| { |
| return decode(nm); |
| } |
| catch (NumberFormatException e) |
| { |
| return def; |
| } |
| } |
| |
| private static String toUnsignedString(int num, int exp) |
| { |
| // Use an array large enough for a binary number. |
| int radix = 1 << exp; |
| int mask = radix - 1; |
| char[] buffer = new char[32]; |
| int i = 32; |
| do |
| { |
| buffer[--i] = Character.forDigit(num & mask, radix); |
| num = num >>> exp; |
| } |
| while (num != 0); |
| |
| return String.valueOf(buffer, i, 32-i); |
| } |
| |
| /** |
| * Converts the <code>int</code> to a <code>String</code> assuming it is |
| * unsigned in base 16. |
| * @param i the <code>int</code> to convert to <code>String</code> |
| * @return the <code>String</code> representation of the argument. |
| */ |
| public static String toHexString(int i) |
| { |
| return toUnsignedString(i, 4); |
| } |
| |
| /** |
| * Converts the <code>int</code> to a <code>String</code> assuming it is |
| * unsigned in base 8. |
| * @param i the <code>int</code> to convert to <code>String</code> |
| * @return the <code>String</code> representation of the argument. |
| */ |
| public static String toOctalString(int i) |
| { |
| return toUnsignedString(i, 3); |
| } |
| |
| /** |
| * Converts the <code>int</code> to a <code>String</code> assuming it is |
| * unsigned in base 2. |
| * @param i the <code>int</code> to convert to <code>String</code> |
| * @return the <code>String</code> representation of the argument. |
| */ |
| public static String toBinaryString(int i) |
| { |
| return toUnsignedString(i, 1); |
| } |
| |
| /** |
| * Converts the <code>int</code> to a <code>String</code> and assumes |
| * a radix of 10. |
| * @param i the <code>int</code> to convert to <code>String</code> |
| * @return the <code>String</code> representation of the argument. |
| */ |
| public static String toString(int i) |
| { |
| // This is tricky: in libgcj, String.valueOf(int) is a fast native |
| // implementation. In Classpath it just calls back to |
| // Integer.toString(int,int). |
| return String.valueOf (i); |
| } |
| |
| /** |
| * Converts the <code>Integer</code> value to a <code>String</code> and |
| * assumes a radix of 10. |
| * @return the <code>String</code> representation of this <code>Integer</code>. |
| */ |
| public String toString() |
| { |
| return toString (value); |
| } |
| |
| /** |
| * Converts the <code>int</code> to a <code>String</code> using |
| * the specified radix (base). |
| * @param i the <code>int</code> to convert to <code>String</code>. |
| * @param radix the radix (base) to use in the conversion. |
| * @return the <code>String</code> representation of the argument. |
| */ |
| public static String toString(int num, int radix) |
| { |
| if (radix < Character.MIN_RADIX || radix > Character.MAX_RADIX) |
| radix = 10; |
| |
| // For negative numbers, print out the absolute value w/ a leading '-'. |
| // Use an array large enough for a binary number. |
| char[] buffer = new char[33]; |
| int i = 33; |
| boolean isNeg; |
| if (num < 0) |
| { |
| isNeg = true; |
| num = -(num); |
| |
| // When the value is MIN_VALUE, it overflows when made positive |
| if (num < 0) |
| { |
| buffer[--i] = Character.forDigit(-(num + radix) % radix, radix); |
| num = -(num / radix); |
| } |
| } |
| else |
| isNeg = false; |
| |
| do |
| { |
| buffer[--i] = Character.forDigit(num % radix, radix); |
| num /= radix; |
| } |
| while (num > 0); |
| |
| if (isNeg) |
| buffer[--i] = '-'; |
| |
| return String.valueOf(buffer, i, 33-i); |
| } |
| |
| /** |
| * Creates a new <code>Integer</code> object using the <code>String</code>, |
| * assuming a radix of 10. |
| * @param s the <code>String</code> to convert. |
| * @return the new <code>Integer</code>. |
| * @see #Integer(java.lang.String) |
| * @see #parseInt(java.lang.String) |
| * @exception NumberFormatException thrown if the <code>String</code> |
| * cannot be parsed as an <code>int</code>. |
| */ |
| public static Integer valueOf(String s) throws NumberFormatException |
| { |
| return new Integer(parseInt(s)); |
| } |
| |
| /** |
| * Creates a new <code>Integer</code> object using the <code>String</code> |
| * and specified radix (base). |
| * @param s the <code>String</code> to convert. |
| * @param radix the radix (base) to convert with. |
| * @return the new <code>Integer</code>. |
| * @see #parseInt(java.lang.String,int) |
| * @exception NumberFormatException thrown if the <code>String</code> |
| * cannot be parsed as an <code>int</code>. |
| */ |
| public static Integer valueOf(String s, int radix) |
| throws NumberFormatException |
| { |
| return new Integer(parseInt(s, radix)); |
| } |
| |
| /** |
| * Converts the specified <code>String</code> into an <code>int</code>. |
| * This function assumes a radix of 10. |
| * |
| * @param s the <code>String</code> to convert |
| * @return the <code>int</code> value of the <code>String</code> |
| * argument. |
| * @exception NumberFormatException thrown if the <code>String</code> |
| * cannot be parsed as an <code>int</code>. |
| */ |
| public static int parseInt(String s) throws NumberFormatException |
| { |
| return parseInt(s, 10); |
| } |
| |
| /** |
| * Converts the specified <code>String</code> into an <code>int</code> |
| * using the specified radix (base). |
| * |
| * @param s the <code>String</code> to convert |
| * @param radix the radix (base) to use in the conversion |
| * @return the <code>String</code> argument converted to </code>int</code>. |
| * @exception NumberFormatException thrown if the <code>String</code> |
| * cannot be parsed as a <code>int</code>. |
| */ |
| public static int parseInt(String str, int radix) |
| throws NumberFormatException |
| { |
| final int len; |
| |
| if (str == null) |
| throw new NumberFormatException (); |
| |
| if ((len = str.length()) == 0 || |
| radix < Character.MIN_RADIX || radix > Character.MAX_RADIX) |
| throw new NumberFormatException(); |
| |
| boolean isNeg = false; |
| int index = 0; |
| if (str.charAt(index) == '-') |
| if (len > 1) |
| { |
| isNeg = true; |
| index++; |
| } |
| else |
| throw new NumberFormatException(); |
| |
| return parseInt(str, index, len, isNeg, radix); |
| } |
| |
| private static int parseInt(String str, int index, int len, boolean isNeg, |
| int radix) |
| throws NumberFormatException |
| { |
| int val = 0; |
| int digval; |
| |
| int max = MAX_VALUE / radix; |
| // We can't directly write `max = (MAX_VALUE + 1) / radix'. |
| // So instead we fake it. |
| if (isNeg && MAX_VALUE % radix == radix - 1) |
| ++max; |
| |
| for ( ; index < len; index++) |
| { |
| if (val < 0 || val > max) |
| throw new NumberFormatException(); |
| |
| if ((digval = Character.digit(str.charAt(index), radix)) < 0) |
| throw new NumberFormatException(); |
| |
| // Throw an exception for overflow if result is negative. |
| // However, we special-case the most negative value. |
| val = val * radix + digval; |
| if (val < 0 && (! isNeg || val != MIN_VALUE)) |
| throw new NumberFormatException(); |
| } |
| |
| return isNeg ? -(val) : val; |
| } |
| |
| /** |
| * Convert the specified <code>String</code> into an <code>Integer</code>. |
| * The <code>String</code> may represent decimal, hexadecimal, or |
| * octal numbers. |
| * |
| * The <code>String</code> argument is interpreted based on the leading |
| * characters. Depending on what the String begins with (after an optional |
| * minus sign), the base will be interpreted differently: |
| * |
| * <table border=1> |
| * <tr><th>Leading<br>Characters</th><th>Base</th></tr> |
| * <tr><td>#</td><td>16</td></tr> |
| * <tr><td>0x</td><td>16</td></tr> |
| * <tr><td>0X</td><td>16</td></tr> |
| * <tr><td>0</td><td>8</td></tr> |
| * <tr><td>Anything<br>Else</td><td>10</td></tr> |
| * </table> |
| * |
| * If the String starts with a minus sign the result is negated. |
| * |
| * @param str the <code>String</code> to interpret. |
| * @return the value of the String as an <code>Integer</code>. |
| * @exception NumberFormatException thrown if the <code>String</code> |
| * cannot be parsed as an <code>int</code>. |
| */ |
| public static Integer decode(String str) throws NumberFormatException |
| { |
| boolean isNeg = false; |
| int index = 0; |
| int radix = 10; |
| final int len; |
| |
| if ((len = str.length()) == 0) |
| throw new NumberFormatException("empty string"); |
| |
| if (str.charAt(index) == '-') |
| { |
| // The minus sign should be followed by at least one more char |
| if (len > 1) |
| { |
| isNeg = true; |
| index++; |
| } |
| else |
| throw new NumberFormatException(); |
| } |
| |
| if (str.charAt(index) == '#') |
| { |
| radix = 16; |
| index++; |
| } |
| else if (str.charAt(index) == '0') |
| { |
| index++; |
| |
| // Check if str is just "0" or "-0" |
| if (len == index) |
| return new Integer(0); |
| |
| if (str.charAt(index) == 'x' || str.charAt(index) == 'X') |
| { |
| radix = 16; |
| index++; |
| } |
| else |
| radix = 8; |
| } |
| |
| if (index >= len) |
| throw new NumberFormatException("empty value"); |
| |
| return new Integer(parseInt(str, index, len, isNeg, radix)); |
| } |
| |
| /** Return the value of this <code>Integer</code> as a <code>byte</code>. |
| ** @return the value of this <code>Integer</code> as a <code>byte</code>. |
| **/ |
| public byte byteValue() |
| { |
| return (byte) value; |
| } |
| |
| /** Return the value of this <code>Integer</code> as a <code>short</code>. |
| ** @return the value of this <code>Integer</code> as a <code>short</code>. |
| **/ |
| public short shortValue() |
| { |
| return (short) value; |
| } |
| |
| /** Return the value of this <code>Integer</code> as an <code>int</code>. |
| ** @return the value of this <code>Integer</code> as an <code>int</code>. |
| **/ |
| public int intValue() |
| { |
| return value; |
| } |
| |
| /** Return the value of this <code>Integer</code> as a <code>long</code>. |
| ** @return the value of this <code>Integer</code> as a <code>long</code>. |
| **/ |
| public long longValue() |
| { |
| return value; |
| } |
| |
| /** Return the value of this <code>Integer</code> as a <code>float</code>. |
| ** @return the value of this <code>Integer</code> as a <code>float</code>. |
| **/ |
| public float floatValue() |
| { |
| return value; |
| } |
| |
| /** Return the value of this <code>Integer</code> as a <code>double</code>. |
| ** @return the value of this <code>Integer</code> as a <code>double</code>. |
| **/ |
| public double doubleValue() |
| { |
| return value; |
| } |
| |
| /** |
| * Compare two Integers numerically by comparing their |
| * <code>int</code> values. |
| * @return a positive value if this <code>Integer</code> is greater |
| * in value than the argument <code>Integer</code>; a negative value |
| * if this <code>Integer</code> is smaller in value than the argument |
| * <code>Integer</code>; and <code>0</code>, zero, if this |
| * <code>Integer</code> is equal in value to the argument |
| * <code>Integer</code>. |
| * |
| * @since 1.2 |
| */ |
| public int compareTo(Integer i) |
| { |
| if (this.value == i.value) |
| return 0; |
| |
| // Returns just -1 or 1 on inequality; doing math might overflow. |
| if (this.value > i.value) |
| return 1; |
| |
| return -1; |
| } |
| |
| /** |
| * Behaves like <code>compareTo(java.lang.Integer)</code> unless the Object |
| * is not a <code>Integer</code>. Then it throws a |
| * <code>ClassCastException</code>. |
| * @exception ClassCastException if the argument is not a |
| * <code>Integer</code>. |
| * |
| * @since 1.2 |
| */ |
| public int compareTo(Object o) |
| { |
| return compareTo((Integer)o); |
| } |
| } |