1 | /*
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2 | * The Apache Software License, Version 1.1
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3 | *
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4 | * Copyright (c) 2001-2002 The Apache Software Foundation. All rights
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5 | * reserved.
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6 | *
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7 | * Redistribution and use in source and binary forms, with or without
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8 | * modification, are permitted provided that the following conditions
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9 | * are met:
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10 | *
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11 | * 1. Redistributions of source code must retain the above copyright
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12 | * notice, this list of conditions and the following disclaimer.
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13 | *
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14 | * 2. Redistributions in binary form must reproduce the above copyright
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15 | * notice, this list of conditions and the following disclaimer in
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16 | * the documentation and/or other materials provided with the
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17 | * distribution.
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18 | *
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19 | * 3. The end-user documentation included with the redistribution, if
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20 | * any, must include the following acknowlegement:
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21 | * "This product includes software developed by the
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22 | * Apache Software Foundation (http://www.apache.org/)."
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23 | * Alternately, this acknowlegement may appear in the software itself,
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24 | * if and wherever such third-party acknowlegements normally appear.
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25 | *
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26 | * 4. The names "The Jakarta Project", "Ant", and "Apache Software
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27 | * Foundation" must not be used to endorse or promote products derived
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28 | * from this software without prior written permission. For written
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29 | * permission, please contact [email protected].
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30 | *
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31 | * 5. Products derived from this software may not be called "Apache"
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32 | * nor may "Apache" appear in their names without prior written
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33 | * permission of the Apache Group.
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34 | *
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35 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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36 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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37 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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38 | * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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39 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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40 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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41 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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42 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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43 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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44 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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45 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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46 | * SUCH DAMAGE.
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47 | * ====================================================================
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48 | *
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49 | * This software consists of voluntary contributions made by many
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50 | * individuals on behalf of the Apache Software Foundation. For more
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51 | * information on the Apache Software Foundation, please see
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52 | * <http://www.apache.org/>.
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53 | */
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54 | package ise.antelope.tasks;
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55 |
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56 | import org.apache.tools.ant.BuildException;
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57 | import java.util.Vector;
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58 | import java.util.Enumeration;
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59 |
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60 | /**
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61 | * Represents a mathematical operation.
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62 | * @author Dale Anson, [email protected]
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63 | */
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64 | public class Op {
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65 | // datatype for the result of this operation
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66 | private String datatype = null;
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67 |
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68 | // storage for the numbers to execute the operation on
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69 | Vector nums = new Vector();
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70 |
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71 | // storage for nested Ops
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72 | Vector ops = new Vector();
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73 |
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74 | // storage for operation
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75 | String operation = null;
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76 |
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77 | // should the StrictMath library be used?
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78 | private boolean _strict = false;
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79 |
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80 | /**
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81 | * Set the operation.
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82 | */
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83 | public void setOp( String op ) {
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84 | if (op.equals("+"))
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85 | operation = "add";
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86 | else if (op.equals("-"))
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87 | operation = "subtract";
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88 | else if (op.equals("*"))
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89 | operation = "multiply";
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90 | else if (op.equals("/"))
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91 | operation = "divide";
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92 | else if (op.equals("%"))
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93 | operation = "mod";
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94 | else
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95 | operation = op;
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96 | }
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97 |
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98 | /**
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99 | * Add a number to this operation. An operation can hold any number of
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100 | * numbers to support formulas like 5 + 4 + 3 + 2 + 1.
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101 | * @param num a number to use in this operation
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102 | */
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103 | public void addNum( Num num ) {
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104 | nums.addElement( num );
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105 | }
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106 |
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107 | /**
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108 | * Sets the datatype of this calculation. Allowed values are
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109 | * "int", "long", "float", or "double".
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110 | */
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111 | public void setDatatype( String p ) {
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112 | if ( p.equals( "int" ) ||
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113 | p.equals( "long" ) ||
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114 | p.equals( "float" ) ||
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115 | p.equals( "double" ) )
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116 | datatype = p;
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117 | else
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118 | throw new BuildException( "Invalid datatype: " + p +
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119 | ". Must be one of int, long, float, or double." );
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120 | }
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121 |
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122 | /**
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123 | * Add a nested operation.
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124 | * @param the operation to add.
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125 | */
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126 | public void addConfiguredOp( Op op ) {
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127 | if ( datatype != null )
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128 | op.setDatatype( datatype );
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129 | ops.addElement( op );
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130 | }
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131 |
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132 | /**
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133 | * Use the StrictMath library.
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134 | */
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135 | public void setStrict( boolean b ) {
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136 | _strict = b;
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137 | }
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138 |
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139 | /**
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140 | * Perform this operation.
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141 | * @return the value resulting from the calculation as a Num.
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142 | */
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143 | public Num calculate() {
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144 | if ( operation == null )
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145 | throw new BuildException( "Operation not specified." );
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146 |
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147 | // calculate nested Ops
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148 | Enumeration en = ops.elements();
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149 | while ( en.hasMoreElements() ) {
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150 | Op op = ( Op ) en.nextElement();
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151 | if ( datatype != null )
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152 | op.setDatatype( datatype );
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153 | nums.addElement( op.calculate() );
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154 | }
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155 |
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156 | // make an array of operands
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157 | String[] operands = new String[ nums.size() ];
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158 | en = nums.elements();
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159 | int i = 0;
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160 | while ( en.hasMoreElements() ) {
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161 | Num num = (Num)en.nextElement();
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162 | if (datatype != null)
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163 | num.setDatatype(datatype);
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164 | operands[ i++ ] = num.toString();
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165 | }
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166 |
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167 | Math math = new Math(_strict);
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168 |
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169 | Number number = math.calculate( operation, datatype, operands );
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170 | Num num = new Num();
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171 | num.setValue(number.toString());
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172 | num.setDatatype(datatype);
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173 | return num;
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174 |
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175 | }
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176 | }
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177 |
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178 |
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