001: // ============================================================================
002: // $Id: DecimalMath.java,v 1.5 2005/08/02 23:45:05 davidahall Exp $
003: // Copyright (c) 2003-2005 David A. Hall
004: // ============================================================================
005: // The contents of this file are subject to the Common Development and
006: // Distribution License (CDDL), Version 1.0 (the License); you may not use this
007: // file except in compliance with the License. You should have received a copy
008: // of the the License along with this file: if not, a copy of the License is
009: // available from Sun Microsystems, Inc.
010: //
011: // http://www.sun.com/cddl/cddl.html
012: //
013: // From time to time, the license steward (initially Sun Microsystems, Inc.) may
014: // publish revised and/or new versions of the License. You may not use,
015: // distribute, or otherwise make this file available under subsequent versions
016: // of the License.
017: //
018: // Alternatively, the contents of this file may be used under the terms of the
019: // GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which
020: // case the provisions of the LGPL are applicable instead of those above. If you
021: // wish to allow use of your version of this file only under the terms of the
022: // LGPL, and not to allow others to use your version of this file under the
023: // terms of the CDDL, indicate your decision by deleting the provisions above
024: // and replace them with the notice and other provisions required by the LGPL.
025: // If you do not delete the provisions above, a recipient may use your version
026: // of this file under the terms of either the CDDL or the LGPL.
027: //
028: // This library is distributed in the hope that it will be useful,
029: // but WITHOUT ANY WARRANTY; without even the implied warranty of
030: // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
031: // ============================================================================
032:
033: package net.sf.jga.fn.arithmetic;
034:
035: import java.math.BigDecimal;
036:
037: /**
038: * Provides Arithmetic implementation for BigDecimals
039: * <p>
040: * Copyright © 2003-2005 David A. Hall
041: *
042: * @author <a href="mailto:davidahall@users.sourceforge.net">David A. Hall</a>
043: */
044:
045: class DecimalMath implements Arithmetic<BigDecimal> {
046:
047: static final long serialVersionUID = 2565703485705053014L;
048:
049: static private final BigDecimal ZERO = new BigDecimal(0.0);
050: static private final BigDecimal ONE = new BigDecimal(1.0);
051:
052: /**
053: * Returns the given value in the appropriate type
054: * @throws IllegalArgumentException if the value cannot be converted
055: */
056:
057: public BigDecimal valueOf(Number value)
058: throws IllegalArgumentException {
059: if (value instanceof BigDecimal)
060: return (BigDecimal) value;
061: else
062: return new BigDecimal(value.toString());
063: }
064:
065: /**
066: * Returns the value 0 of the appropriate type
067: */
068:
069: public BigDecimal zero() {
070: return ZERO;
071: }
072:
073: /**
074: * Returns the value 1 of the appropriate type
075: */
076:
077: public BigDecimal one() {
078: return ONE;
079: }
080:
081: /**
082: * For numeric arguments x and y, returns x + y
083: * @return the sum of the two arguments
084: */
085:
086: public BigDecimal plus(BigDecimal x, BigDecimal y) {
087: return x.add(y);
088: }
089:
090: /**
091: * For numeric arguments x and y, returns x - y
092: * @return the difference of the two arguments
093: */
094:
095: public BigDecimal minus(BigDecimal x, BigDecimal y) {
096: return x.subtract(y);
097: }
098:
099: /**
100: * For numeric arguments x and y, returns x * y
101: * @return the product of the two arguments
102: */
103:
104: public BigDecimal multiplies(BigDecimal x, BigDecimal y) {
105: return x.multiply(y);
106: }
107:
108: /**
109: * For numeric arguments x and y, returns x / y (rounded HALF_UP)
110: * @return the quotient of the two arguments
111: */
112:
113: public BigDecimal divides(BigDecimal x, BigDecimal y) {
114: return x.divide(y, BigDecimal.ROUND_HALF_UP);
115: }
116:
117: /**
118: * for numeric argument x, returns -x
119: * @return the negative of its argument
120: */
121:
122: public BigDecimal negate(BigDecimal x) {
123: return x.negate();
124: }
125: }
|