| /* BigDecimalHelper.java -- |
| Copyright (C) 2005 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., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 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 gnu.CORBA; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| |
| import java.math.BigDecimal; |
| import java.math.BigInteger; |
| |
| import org.omg.CORBA.TypeCode; |
| import org.omg.CORBA.TypeCodePackage.BadKind; |
| |
| /** |
| * Reads and writes BigDecimal as CORBA <code>fixed</code>. |
| * The format, described in CORBA specification, requires to store |
| * data in hexadecimal format, two digits per byte (oceted), most |
| * significant digit first. The last half-byte in the representation |
| * stores the sign, being 0xD for negative numbers and 0xC for |
| * zero and positive numbers. To have the even number of half bytes, |
| * 0x0 is appended to the beginning, if required. The position of the |
| * decimal point is not stored. |
| * |
| * @author Audrius Meskauskas (AudriusA@Bioinformatics.org) |
| */ |
| public class BigDecimalHelper |
| { |
| { |
| } |
| |
| /** |
| * @todo remove from the release version. |
| */ |
| public static void main(String[] args) |
| { |
| try |
| { |
| ByteArrayOutputStream b = new ByteArrayOutputStream(); |
| BigDecimal d = new BigDecimal("12234.54689"); |
| |
| write(b, d); |
| |
| byte[] a = b.toByteArray(); |
| |
| for (int i = 0; i < a.length; i++) |
| { |
| int k = a [ i ] & 0xFF; |
| System.out.print(Integer.toHexString(k) + " "); |
| } |
| |
| System.out.println("Now reading"); |
| |
| ByteArrayInputStream bin = new ByteArrayInputStream(a); |
| |
| BigDecimal r = read(bin, d.scale()); |
| |
| System.out.println(r); |
| } |
| catch (Exception ex) |
| { |
| ex.printStackTrace(); |
| } |
| } |
| |
| /** |
| * Read the CORBA fixed, autodetecting the number of bytes |
| * and assuming the given scale. |
| */ |
| public static BigDecimal read(java.io.InputStream in, int scale) |
| throws IOException |
| { |
| ByteArrayOutputStream bout = new ByteArrayOutputStream(); |
| |
| int f; |
| |
| do |
| { |
| f = in.read(); |
| if (f >= 0) |
| bout.write(f); |
| } |
| // The last byte has 0xC or 0xD in the last halfbyte. |
| while ((f & 0xF) <= 0x9); |
| |
| return createFixed(scale, bout.toByteArray()); |
| } |
| |
| /** |
| * Write the big decimal as CORBA <code>fixed<.code>. |
| * The scale will not be stored. |
| * |
| * @param out a stream to write into. |
| * @param x a big decimal to write. |
| * @param digits a number of the decimal digits in the record |
| * being written. For the smaller |
| * numbers, zeroes are added to the left. |
| * |
| * @throws IOException if the stream write method throws one. |
| * @throws BadKind if this BigDecimal has more digits than |
| * specified. |
| */ |
| public static void write(java.io.OutputStream out, BigDecimal x) |
| throws IOException, BadKind |
| { |
| StringBuffer v = new StringBuffer(x.unscaledValue().toString()); |
| |
| boolean negative = v.charAt(0) == '-'; |
| |
| if (negative) |
| v = v.deleteCharAt(0); |
| |
| if ( (v.length() & 1) == 0) |
| v.insert(0, '0'); |
| |
| int c; |
| |
| for (int i = 0; i < v.length() - 1; i = i + 2) |
| { |
| c = ((v.charAt(i) - '0') << 4) | (v.charAt(i + 1) - '0'); |
| out.write(c); |
| } |
| |
| c = ((v.charAt(v.length() - 1) - '0') << 4) | (negative ? 0xD : 0xC); |
| |
| out.write(c); |
| } |
| |
| /** |
| * Convert the loaded byte array, representing |
| * CORBA <code>fixed</code>, into an instance of |
| * the {@link BigDecimal} |
| */ |
| private static BigDecimal createFixed(int scale, byte[] d) |
| { |
| StringBuffer s = new StringBuffer(2 * d.length); |
| |
| int last = d.length - 1; |
| |
| if ((d [ last ] & 0xF) == 0xD) |
| s.append('-'); |
| |
| if (last > 0) |
| for (int i = 0; i < last; i++) |
| { |
| s.append((char) (((d [ i ] >> 4) & 0xF) + '0')); |
| s.append((char) (((d [ i ]) & 0xF) + '0')); |
| } |
| |
| s.append((char) (((d [ last ] >> 4) & 0xF) + '0')); |
| |
| BigInteger b = new BigInteger(s.toString()); |
| BigDecimal dec = new BigDecimal(b, scale); |
| |
| return dec; |
| } |
| } |