Initial revision

From-SVN: r26263

1 files changed, 355 insertions, 0 deletions

diff --git a/libjava/java/lang/Integer.java b/libjava/java/lang/Integer.java
new file mode 100644
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+/* Copyright (C) 1998, 1999  Cygnus Solutions
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+ 
+package java.lang;
+
+/**
+ * @author Warren Levy <warrenl@cygnus.com>
+ * @date September 11, 1998.  
+ */
+/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
+ * "The Java Language Specification", ISBN 0-201-63451-1
+ * plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
+ * Status:  Believed complete and correct.
+ */
+ 
+public final class Integer extends Number implements Comparable
+{
+  public static final int MAX_VALUE = 0x7FFFFFFF;
+  public static final int MIN_VALUE = 0x80000000;
+
+  // This initialization is seemingly circular, but it is accepted
+  // by javac, and is handled specially by gcc.
+  public static final Class TYPE = int.class;
+
+  /* The int value of the instance. */
+  private int value;
+
+  public Integer(int val)
+  {
+    value = val;
+  }
+
+  public Integer(String str) throws NumberFormatException
+  {
+    value = parseInt(str, 10);
+  }
+
+  public byte byteValue()
+  {
+    return (byte) value;
+  }
+
+  public double doubleValue()
+  {
+    return (double) value;
+  }
+
+  public float floatValue()
+  {
+    return (float) value;
+  }
+
+  public int intValue()
+  {
+    return value;
+  }
+
+  public long longValue()
+  {
+    return value;
+  }
+
+  public short shortValue()
+  {
+    return (short) value;
+  }
+
+  // Added in JDK 1.2
+  public int compareTo(Integer anotherInteger)
+  {
+    if (this.value == anotherInteger.value)
+      return 0;
+
+    // Returns just -1 or 1 on inequality; doing math might overflow the int.
+    if (this.value > anotherInteger.value)
+      return 1;
+
+    return -1;
+  }
+
+  // Added in JDK 1.2
+  public int compareTo(Object o) throws ClassCastException
+  {
+    if (!(o instanceof Integer))
+      throw new ClassCastException();
+
+    return this.compareTo((Integer) o);
+  }
+
+  public static Integer decode(String str) throws NumberFormatException
+  {
+    boolean isNeg = false;
+    int index = 0;
+    int radix = 10;
+    final int len;
+
+    if (str == null || (len = str.length()) == 0)
+      throw new NumberFormatException();
+
+    // Negative numbers are always radix 10.
+    if (str.charAt(0) == '-')
+      {
+        radix = 10;
+        index++;
+        isNeg = true;
+      }
+    else if (str.charAt(index) == '#')
+      {
+        radix = 16;
+        index++;
+      }
+    else if (str.charAt(index) == '0')
+      {
+        // Check if str is just "0"
+        if (len == 1)
+          return new Integer(0);
+
+        index++;
+        if (str.charAt(index) == 'x')
+          {
+            radix = 16;
+            index++;
+          }
+        else
+          radix = 8;
+      }
+
+    if (index >= len)
+      throw new NumberFormatException();
+
+    return new Integer(parseInt(str, index, len, isNeg, radix));
+  }
+
+  public boolean equals(Object obj)
+  {
+    return (obj != null && (obj instanceof Integer)
+            && ((Integer) obj).value == value);
+  }
+
+  public static Integer getInteger(String prop)
+  {
+    return getInteger(prop, null);
+  }
+
+  public static Integer getInteger(String prop, int defval)
+  {
+    Integer val = getInteger(prop, null);
+    return val == null ? new Integer(defval) : val;
+  }
+
+  public static Integer getInteger(String prop, Integer defobj)
+  {
+    try
+    {
+      return decode(System.getProperty(prop));
+    }
+    catch (NumberFormatException ex)
+    {
+      return defobj;
+    }
+  }
+
+  public int hashCode()
+  {
+    return value;
+  }
+
+  public static int parseInt(String str) throws NumberFormatException
+  {
+    return parseInt(str, 10);
+  }
+
+  public static int parseInt(String str, int radix) throws NumberFormatException
+  {
+    final int len;
+
+    if (str == null || (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;
+
+    for ( ; index < len; index++)
+      {
+	// The the previous loop iteration left us with a negative
+	// value (which can only be the most negative value, but we
+	// don't check that), then having more digits is wrong.
+	if (val == MIN_VALUE)
+	  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 *= radix;
+	if (val < 0 || val + digval < 0)
+	  {
+	    if (isNeg && val + digval == MIN_VALUE)
+	      {
+		// Ok.
+	      }
+	    else
+	      throw new NumberFormatException();
+	  }
+	val += digval;
+      }
+
+    return isNeg ? -(val) : val;
+  }
+
+  public static String toBinaryString(int num)
+  {
+    return toUnsignedString(num, 1);
+  }
+
+  public static String toHexString(int num)
+  {
+    return toUnsignedString(num, 4);
+  }
+
+  public static String toOctalString(int num)
+  {
+    return toUnsignedString(num, 3);
+  }
+
+  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);
+  }
+
+  public String toString()
+  {
+    return toString(this.value);
+  }
+
+  public static String toString(int num)
+  {
+    // Use an arrary large enough for "-2147483648"; i.e. 11 chars.
+    char[] buffer = new char[11];
+    int i = 11;
+    boolean isNeg;
+    if (num < 0)
+      {
+        isNeg = true;
+        num = -(num);
+        if (num < 0)
+          {
+            // Must be MIN_VALUE, so handle this special case.
+            buffer[--i] = '8';
+            num = 214748364;
+          }
+      }
+    else
+      isNeg = false;
+
+    do
+      {
+        buffer[--i] = (char) ((int) '0' + (num % 10));
+        num /= 10;
+      }
+    while (num > 0);
+
+    if (isNeg)
+      buffer[--i] = '-';
+
+    return String.valueOf(buffer, i, 11-i);
+  }
+
+  public static String toString(int num, int radix)
+  {
+    // Use optimized method for the typical case.
+    if (radix == 10 ||
+        radix < Character.MIN_RADIX || radix > Character.MAX_RADIX)
+      return toString(num);
+
+    // 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);
+  }
+
+  public static Integer valueOf(String str) throws NumberFormatException
+  {
+    return new Integer(parseInt(str, 10));
+  }
+
+  public static Integer valueOf(String str, int radix)
+  				throws NumberFormatException
+  {
+    return new Integer(parseInt(str, radix));
+  }
+}