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: DefaultOperatorFactory.java 3521 2007-10-16 10:55:14Z tmorgner $ 028 * ------------ 029 * (C) Copyright 2006-2007, by Pentaho Corporation. 030 */ 031 package org.jfree.formula.operators; 032 033 import java.util.HashMap; 034 import java.util.Iterator; 035 036 import org.jfree.util.Configuration; 037 import org.jfree.util.ObjectUtilities; 038 039 /** 040 * Creation-Date: 02.11.2006, 12:29:27 041 * 042 * @author Thomas Morgner 043 */ 044 public class DefaultOperatorFactory implements OperatorFactory 045 { 046 private static final String INFIX_PREFIX = "org.jfree.formula.operators.infix."; 047 private static final String PREFIX_PREFIX = "org.jfree.formula.operators.prefix."; 048 private static final String POSTFIX_PREFIX = "org.jfree.formula.operators.postfix."; 049 050 private HashMap infixOperators; 051 private HashMap prefixOperators; 052 private HashMap postfixOperators; 053 054 public DefaultOperatorFactory() 055 { 056 infixOperators = new HashMap(); 057 prefixOperators = new HashMap(); 058 postfixOperators = new HashMap(); 059 } 060 061 public void initalize(final Configuration configuration) 062 { 063 loadInfixOperators(configuration); 064 loadPrefixOperators(configuration); 065 loadPostfixOperators(configuration); 066 } 067 068 private void loadInfixOperators(final Configuration configuration) 069 { 070 final Iterator infixKeys = configuration.findPropertyKeys(INFIX_PREFIX); 071 while (infixKeys.hasNext()) 072 { 073 final String configKey = (String) infixKeys.next(); 074 if (configKey.endsWith(".class") == false) 075 { 076 continue; 077 } 078 final String operatorClass = configuration.getConfigProperty(configKey); 079 if (operatorClass == null) 080 { 081 continue; 082 } 083 if (operatorClass.length() == 0) 084 { 085 continue; 086 } 087 final String tokenKey = configKey.substring 088 (0, configKey.length() - ".class".length()) + ".token"; 089 final String token = configuration.getConfigProperty(tokenKey); 090 if (token == null) 091 { 092 continue; 093 } 094 final String tokenTrimmed = token.trim(); 095 096 // this assumption was breaking >=, <=, and <> 097 // if (tokenTrimmed.length() != 1) 098 // { 099 // continue; 100 // } 101 102 final Object operator = ObjectUtilities.loadAndInstantiate 103 (operatorClass, DefaultOperatorFactory.class, InfixOperator.class); 104 if (operator instanceof InfixOperator) 105 { 106 infixOperators.put (tokenTrimmed, operator); 107 } 108 } 109 } 110 111 private void loadPrefixOperators(final Configuration configuration) 112 { 113 final Iterator infixKeys = configuration.findPropertyKeys(PREFIX_PREFIX); 114 final int infixLength = PREFIX_PREFIX.length(); 115 while (infixKeys.hasNext()) 116 { 117 final String configKey = (String) infixKeys.next(); 118 if (configKey.endsWith(".class") == false) 119 { 120 continue; 121 } 122 final String operatorClass = configuration.getConfigProperty(configKey); 123 if (operatorClass == null) 124 { 125 continue; 126 } 127 if (operatorClass.length() == 0) 128 { 129 continue; 130 } 131 final String tokenKey = configKey.substring 132 (0, configKey.length() - ".class".length()) + ".token"; 133 final String token = configuration.getConfigProperty(tokenKey); 134 if (token == null) 135 { 136 continue; 137 } 138 final String tokenTrimmed = token.trim(); 139 140 // this is an invalid assumption 141 // if (tokenTrimmed.length() != 1) 142 // { 143 // continue; 144 // } 145 146 final Object operator = ObjectUtilities.loadAndInstantiate 147 (operatorClass, DefaultOperatorFactory.class, PrefixOperator.class); 148 if (operator instanceof PrefixOperator) 149 { 150 prefixOperators.put (tokenTrimmed, operator); 151 } 152 } 153 } 154 155 private void loadPostfixOperators(final Configuration configuration) 156 { 157 final Iterator infixKeys = configuration.findPropertyKeys(POSTFIX_PREFIX); 158 final int infixLength = POSTFIX_PREFIX.length(); 159 while (infixKeys.hasNext()) 160 { 161 final String configKey = (String) infixKeys.next(); 162 if (configKey.endsWith(".class") == false) 163 { 164 continue; 165 } 166 final String operatorClass = configuration.getConfigProperty(configKey); 167 if (operatorClass == null) 168 { 169 continue; 170 } 171 if (operatorClass.length() == 0) 172 { 173 continue; 174 } 175 final String tokenKey = configKey.substring 176 (0, configKey.length() - ".class".length()) + ".token"; 177 final String token = configuration.getConfigProperty(tokenKey); 178 if (token == null) 179 { 180 continue; 181 } 182 final String tokenTrimmed = token.trim(); 183 // this is an invalid assumption 184 // if (tokenTrimmed.length() != 1) 185 // { 186 // continue; 187 // } 188 189 final Object operator = ObjectUtilities.loadAndInstantiate 190 (operatorClass, DefaultOperatorFactory.class, PostfixOperator.class); 191 if (operator instanceof PostfixOperator) 192 { 193 postfixOperators.put (tokenTrimmed, operator); 194 } 195 } 196 } 197 198 public InfixOperator createInfixOperator(final String operator) 199 { 200 return (InfixOperator) infixOperators.get(operator); 201 } 202 203 public PostfixOperator createPostfixOperator(final String operator) 204 { 205 return (PostfixOperator) postfixOperators.get(operator); 206 } 207 208 public PrefixOperator createPrefixOperator(final String operator) 209 { 210 return (PrefixOperator) prefixOperators.get(operator); 211 } 212 }