001 /** 002 * ========================================= 003 * LibFormula : a free Java formula library 004 * ========================================= 005 * 006 * Project Info: http://reporting.pentaho.org/libformula/ 007 * 008 * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors. 009 * 010 * This library is free software; you can redistribute it and/or modify it under the terms 011 * of the GNU Lesser General Public License as published by the Free Software Foundation; 012 * either version 2.1 of the License, or (at your option) any later version. 013 * 014 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 015 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 016 * See the GNU Lesser General Public License for more details. 017 * 018 * You should have received a copy of the GNU Lesser General Public License along with this 019 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, 020 * Boston, MA 02111-1307, USA. 021 * 022 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 023 * in the United States and other countries.] 024 * 025 * 026 * ------------ 027 * $Id: PostfixTerm.java 2716 2007-04-01 13:51:58Z taqua $ 028 * ------------ 029 * (C) Copyright 2006-2007, by Pentaho Corporation. 030 */ 031 package org.jfree.formula.lvalues; 032 033 import org.jfree.formula.EvaluationException; 034 import org.jfree.formula.operators.PostfixOperator; 035 036 /** 037 * Creation-Date: 02.11.2006, 10:20:27 038 * 039 * @author Thomas Morgner 040 */ 041 public class PostfixTerm extends AbstractLValue 042 { 043 private PostfixOperator operator; 044 private LValue value; 045 046 public PostfixTerm(final LValue value, final PostfixOperator operator) 047 { 048 if (operator == null) 049 { 050 throw new NullPointerException(); 051 } 052 if (value == null) 053 { 054 throw new NullPointerException(); 055 } 056 this.operator = operator; 057 this.value = value; 058 } 059 060 public PostfixOperator getOperator() 061 { 062 return operator; 063 } 064 065 public LValue getValue() 066 { 067 return value; 068 } 069 070 public TypeValuePair evaluate() throws EvaluationException 071 { 072 return operator.evaluate(getContext(), value.evaluate()); 073 } 074 075 076 public String toString() 077 { 078 return "(" + value + operator + ')'; 079 } 080 081 /** 082 * Checks, whether the LValue is constant. Constant lvalues always return the 083 * same value. 084 * 085 * @return 086 */ 087 public boolean isConstant() 088 { 089 return value.isConstant(); 090 } 091 092 /** 093 * Returns any dependent lvalues (parameters and operands, mostly). 094 * 095 * @return 096 */ 097 public LValue[] getChildValues() 098 { 099 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 }