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<meta http-equiv="Content-Language" content="en-us"> |
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<title>Ant User Manual</title> |
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</head> |
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<body> |
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<h2><a name="Condition">Condition</a></h2> |
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<h3>Description</h3> |
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<p>Sets a property if a certain condition holds true - this is a |
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generalization of <a href="available.html">Available</a> and <a |
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href="uptodate.html">Uptodate</a>.</p> |
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<p>If the condition holds true, the property value is set to true by |
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default; otherwise, the property is not set. You can set the value to |
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something other than the default by specifying the <code>value</code> |
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attribute.</p> |
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<p>Conditions are specified as <a href="#nested">nested elements</a>, |
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you must specify exactly one condition.</p> |
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<h3>Parameters</h3> |
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<table border="1" cellpadding="2" cellspacing="0"> |
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<tr> |
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<td valign="top"><b>Attribute</b></td> |
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<td valign="top"><b>Description</b></td> |
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<td align="center" valign="top"><b>Required</b></td> |
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</tr> |
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<tr> |
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<td valign="top">property</td> |
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<td valign="top">The name of the property to set.</td> |
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<td valign="top" align="center">Yes</td> |
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</tr> |
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<tr> |
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<td valign="top">value</td> |
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<td valign="top">The value to set the property to. Defaults to |
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"true".</td> |
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<td valign="top" align="center">No</td> |
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</tr> |
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</table> |
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<h3><a name="nested">Parameters specified as nested elements</a></h3> |
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<p>All conditions to test are specified as nested elements.</p> |
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<h4>not</h4> |
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<p>The <code><not></code> element expects exactly one other |
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condition to be nested into this element, negating the result of the |
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condition. It doesn't have any attributes and accepts all nested |
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elements of the condition task as nested elements as well.</p> |
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<h4>and</h4> <p> |
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The <code><and></code> element doesn't have any attributes and |
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accepts an arbitrary number of conditions as nested elements - all |
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nested elements of the condition task are supported. This condition |
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is true if all of its contained conditions are, conditions will be |
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evaluated in the order they have been specified in the build file.</p> |
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<p>The <code><and></code> condition has the same shortcut |
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semantics as the Java && operator, as soon as one of the |
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nested conditions is false, no other condition will be evaluated.</p> |
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<h4>or</h4> <p> |
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The <code><or></code> element doesn't have any attributes and |
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accepts an arbitrary number of conditions as nested elements - all |
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nested elements of the condition task are supported. This condition |
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is true if at least one of its contained conditions is, conditions |
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will be evaluated in the order they have been specified in the build |
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file.</p> <p>The <code><or></code> condition has the same |
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shortcut semantics as the Java || operator, as soon as one of the |
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nested conditions is true, no other condition will be evaluated.</p> |
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<h4>available</h4> |
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<p>This condition is identical to the <a |
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href="available.html">Available</a> task, all attributes and nested |
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elements of that task are supported, the property and value attributes |
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are redundant and will be ignored.</p> |
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<h4>uptodate</h4> |
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<p>This condition is identical to the <a |
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href="uptodate.html">Uptodate</a> task, all attributes and nested |
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elements of that task are supported, the property and value attributes |
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are redundant and will be ignored.</p> |
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<h4>os</h4> |
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<p>Test whether the current operating system is of a given type.</p> |
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<table border="1" cellpadding="2" cellspacing="0"> |
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<tr> |
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<td valign="top"><b>Attribute</b></td> |
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<td valign="top"><b>Description</b></td> |
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<td align="center" valign="top"><b>Required</b></td> |
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</tr> |
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<tr> |
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<td valign="top">family</td> |
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<td valign="top">The name of the operating system family to expect.</td> |
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<td valign="top" align="center">No</td> |
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</tr> |
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</table> |
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<p>Supported values for the family attribute are: |
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<ul> |
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<li>windows (for all versions of Microsoft Windows)</li> |
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<li>dos (for all Microsoft DOS based operating systems including |
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Microsoft Windows and OS/2)</li> |
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<li>mac (for all Apple Macintosh systems)</li> |
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<li>unix (for all Unix and Unix-like operating systems)</li> |
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</ul> |
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<h4>equals</h4> |
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<p>Tests whether the two given Strings are identical</p> |
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<table border="1" cellpadding="2" cellspacing="0"> |
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<tr> |
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<td valign="top"><b>Attribute</b></td> |
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<td valign="top"><b>Description</b></td> |
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<td align="center" valign="top"><b>Required</b></td> |
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</tr> |
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<tr> |
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<td valign="top">arg1</td> |
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<td valign="top">First string to test.</td> |
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<td valign="top" align="center">Yes</td> |
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</tr> |
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<tr> |
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<td valign="top">arg2</td> |
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<td valign="top">Second string to test.</td> |
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<td valign="top" align="center">Yes</td> |
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</tr> |
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</table> |
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<h3>Examples</h3> |
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<pre> |
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<condition property="javamail.complete"> |
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<and> |
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<available classname="javax.activation.DataHandler" /> |
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<available classname="javax.mail.Transport" /> |
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</and> |
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</condition> |
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</pre> |
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<p>sets the property <code>javamail.complete</code> if both the |
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JavaBeans Activation Framework and JavaMail are available in the |
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classpath.</p> |
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<pre> |
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<condition property="isMacOsButNotMacOsX"> |
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<and> |
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<os family="mac" /> |
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<not> |
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<os family="unix" /> |
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</not> |
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</and> |
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</condition> |
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</pre> |
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<p>sets the property <code>isMacOsButNotMacOsX</code> if the current |
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operating system is MacOS, but not MacOS X - which Ant considers to be |
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in the Unix family as well.</p> |
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<hr> |
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<p align="center">Copyright © 2001 Apache Software |
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Foundation. All rights Reserved.</p> |
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</body> |
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</html> |
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Stefan Bodewig