Frames | No Frames |
1: /** 2: * ========================================= 3: * LibFormula : a free Java formula library 4: * ========================================= 5: * 6: * Project Info: http://reporting.pentaho.org/libformula/ 7: * 8: * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors. 9: * 10: * This library is free software; you can redistribute it and/or modify it under the terms 11: * of the GNU Lesser General Public License as published by the Free Software Foundation; 12: * either version 2.1 of the License, or (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 15: * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 16: * See the GNU Lesser General Public License for more details. 17: * 18: * You should have received a copy of the GNU Lesser General Public License along with this 19: * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, 20: * Boston, MA 02111-1307, USA. 21: * 22: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 23: * in the United States and other countries.] 24: * 25: * 26: * ------------ 27: * $Id: PrefixTerm.java 2780 2007-05-07 22:51:12Z mimil $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.lvalues; 32: 33: import org.jfree.formula.operators.PrefixOperator; 34: import org.jfree.formula.EvaluationException; 35: 36: /** 37: * Creation-Date: 02.11.2006, 10:20:27 38: * 39: * @author Thomas Morgner 40: */ 41: public class PrefixTerm extends AbstractLValue 42: { 43: private PrefixOperator operator; 44: private LValue value; 45: 46: public PrefixTerm(final PrefixOperator operator, final LValue value) 47: { 48: if (operator == null) 49: { 50: throw new NullPointerException(); 51: } 52: if (value == null) 53: { 54: throw new NullPointerException(); 55: } 56: 57: this.operator = operator; 58: this.value = value; 59: } 60: 61: public PrefixOperator getOperator() 62: { 63: return operator; 64: } 65: 66: public LValue getValue() 67: { 68: return value; 69: } 70: 71: 72: public TypeValuePair evaluate() throws EvaluationException 73: { 74: return operator.evaluate(getContext(), value.evaluate()); 75: } 76: 77: 78: public String toString() 79: { 80: return "(" + operator + value + ")"; 81: } 82: 83: /** 84: * Returns any dependent lvalues (parameters and operands, mostly). 85: * 86: * @return 87: */ 88: public LValue[] getChildValues() 89: { 90: return new LValue[]{ value }; 91: } 92: 93: /** 94: * Checks, whether the LValue is constant. Constant lvalues always return the 95: * same value. 96: * 97: * @return 98: */ 99: public boolean isConstant() 100: { 101: return value.isConstant(); 102: } 103: 104: public Object clone() throws CloneNotSupportedException 105: { 106: final PrefixTerm o = (PrefixTerm) super.clone(); 107: o.value = (LValue) value.clone(); 108: return o; 109: } 110: }