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 java.util.Vector;
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57 | import java.util.Enumeration;
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58 |
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59 | import org.apache.tools.ant.Task;
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60 | import org.apache.tools.ant.TaskContainer;
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61 | import org.apache.tools.ant.BuildException;
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62 |
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63 | /**
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64 | * This task emulates a Java switch.
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65 | * @author Dale Anson
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66 | */
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67 | public class SwitchTask extends Task {
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68 |
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69 | private Vector cases = new Vector();
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70 | private Case defaultCase = null;
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71 | private String name = null;
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72 |
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73 | /**
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74 | * Register dependent tasks.
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75 | */
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76 | public void init() {
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77 | getProject().addTaskDefinition( "case", Case.class );
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78 | getProject().addTaskDefinition( "default", DefaultCase.class );
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79 | getProject().addTaskDefinition( "break", Break.class );
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80 | }
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81 |
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82 | /**
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83 | * Set the name of the property to switch on.
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84 | * @param name the name of the property to switch on.
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85 | */
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86 | public void setName( String name ) {
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87 | this.name = name;
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88 | }
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89 |
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90 | /**
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91 | * Adds a case to this switch. A switch can have any number of cases.
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92 | * @param c the case to add.
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93 | */
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94 | public void addCase( Case c ) {
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95 | cases.addElement( c );
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96 | }
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97 |
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98 | /**
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99 | * Adds a default case to this switch. Only one case may be added.
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100 | * @param c the default case.
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101 | */
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102 | public void addDefault( DefaultCase c ) {
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103 | if ( defaultCase == null ) {
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104 | defaultCase = c;
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105 | return ;
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106 | }
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107 | else
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108 | throw new BuildException( "<switch> can have only one <default>" );
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109 | }
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110 |
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111 | public void execute() throws BuildException {
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112 | if ( name == null )
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113 | throw new BuildException( "'name' attribute cannot be null." );
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114 | String value = getProject().getProperty( name );
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115 | if ( value == null )
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116 | throw new BuildException( "Property " + name + " does not exist." );
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117 | boolean disregardValue = false; // should the case fall through to the next?
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118 | Enumeration en = cases.elements();
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119 | while ( en.hasMoreElements() ) {
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120 | Case c = ( Case ) en.nextElement();
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121 | if ( disregardValue ) {
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122 | c.perform();
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123 | if ( c.doBreak() )
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124 | return ;
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125 | }
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126 | else if ( value.equals( c.getValue() ) ) {
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127 | c.perform();
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128 | if ( c.doBreak() )
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129 | return ;
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130 | else
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131 | disregardValue = true;
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132 | }
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133 | }
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134 | // if here, then do the default case
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135 | if ( defaultCase != null ) {
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136 | defaultCase.perform();
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137 | }
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138 | }
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139 | }
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