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: PostfixTerm.java 2716 2007-04-01 13:51:58Z taqua $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.lvalues; 32: 33: import org.jfree.formula.EvaluationException; 34: import org.jfree.formula.operators.PostfixOperator; 35: 36: /** 37: * Creation-Date: 02.11.2006, 10:20:27 38: * 39: * @author Thomas Morgner 40: */ 41: public class PostfixTerm extends AbstractLValue 42: { 43: private PostfixOperator operator; 44: private LValue value; 45: 46: public PostfixTerm(final LValue value, final PostfixOperator operator) 47: { 48: if (operator == null) 49: { 50: throw new NullPointerException(); 51: } 52: if (value == null) 53: { 54: throw new NullPointerException(); 55: } 56: this.operator = operator; 57: this.value = value; 58: } 59: 60: public PostfixOperator getOperator() 61: { 62: return operator; 63: } 64: 65: public LValue getValue() 66: { 67: return value; 68: } 69: 70: public TypeValuePair evaluate() throws EvaluationException 71: { 72: return operator.evaluate(getContext(), value.evaluate()); 73: } 74: 75: 76: public String toString() 77: { 78: return "(" + value + operator + ')'; 79: } 80: 81: /** 82: * Checks, whether the LValue is constant. Constant lvalues always return the 83: * same value. 84: * 85: * @return 86: */ 87: public boolean isConstant() 88: { 89: return value.isConstant(); 90: } 91: 92: /** 93: * Returns any dependent lvalues (parameters and operands, mostly). 94: * 95: * @return 96: */ 97: public LValue[] getChildValues() 98: { 99: return new LValue[]{ value }; 100: } 101: 102: public Object clone() throws CloneNotSupportedException 103: { 104: final PostfixTerm o = (PostfixTerm) super.clone(); 105: o.value = (LValue) value.clone(); 106: return o; 107: } 108: }