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 * $Id$ 028 * ------------ 029 * (C) Copyright 2006-2007, by Pentaho Corporation. 030 */ 031 package org.jfree.formula.typing.sequence; 032 033 import org.jfree.formula.EvaluationException; 034 import org.jfree.formula.FormulaContext; 035 import org.jfree.formula.typing.ArrayCallback; 036 import org.jfree.formula.typing.Type; 037 038 /** 039 * @author Cedric Pronzato 040 */ 041 public class NumberSequence 042 { 043 private int rowCursor = 0; 044 private int columnCursor = 0; 045 private Number number; 046 private ArrayCallback array; 047 private FormulaContext context; 048 049 /** 050 * Empty number sequence. 051 */ 052 public NumberSequence(final FormulaContext context) 053 { 054 this.context = context; 055 } 056 057 /** 058 * Number sequence bounded to only one number item. 059 * 060 * @param n A number 061 */ 062 public NumberSequence(final Number n, final FormulaContext context) 063 { 064 number = n; 065 this.context = context; 066 } 067 068 /** 069 * Number sequence bounded to an array. 070 * 071 * @param array 072 */ 073 public NumberSequence(final ArrayCallback array, final FormulaContext context) 074 { 075 this.array = array; 076 this.context = context; 077 } 078 079 public boolean hasNext() throws EvaluationException 080 { 081 // empty sequence 082 if (number == null && array == null) 083 { 084 return false; 085 } 086 // sequence of one number 087 if (number != null && rowCursor == 0) 088 { 089 return true; 090 } 091 092 // else array 093 if (array != null) 094 { 095 final int rowCount = array.getRowCount(); 096 final int columnCount = array.getColumnCount(); 097 if (array != null && rowCursor < rowCount && columnCursor < columnCount) 098 { 099 for (; rowCursor < rowCount; rowCursor++) 100 { 101 for (; columnCursor < columnCount; columnCursor++) 102 { 103 final Type type = array.getType(rowCursor, columnCursor); 104 final boolean b = type.isFlagSet(Type.NUMERIC_TYPE); 105 106 if (b) 107 { 108 return true; 109 } 110 } 111 columnCursor = 0; // go to start of the next row 112 } 113 } 114 } 115 116 return false; 117 } 118 119 public Number nextNumber() throws EvaluationException 120 { 121 if (number != null && rowCursor == 0) 122 { 123 rowCursor++; 124 return number; 125 } 126 if (array != null) 127 { 128 final Type type = array.getType(rowCursor, columnCursor); 129 final Object value = array.getValue(rowCursor, columnCursor); 130 final Number number = context.getTypeRegistry().convertToNumber(type, value); 131 // advance 132 if (columnCursor == array.getColumnCount() - 1) 133 { 134 rowCursor++; 135 columnCursor = 0; 136 } 137 else 138 { 139 columnCursor++; 140 } 141 return number; 142 143 } 144 return null; 145 } 146 147 }