CODEWITHSUNDEEP
ant
Chris
Chris

Reputation: 117

condition property in Ant

Here's what the manual says about "condition":

Sets a property if a certain condition holds true. If the condition holds true, the property value is set to true by default; otherwise, the property is not set. You can set the value to something other than the default by specifying the value attribute

What I try:

<echo message="${a}" />
<condition property="a">
    <isfalse value="test" />
</condition>
<echo message="${a}" />

My reasoning:

if property "a" isfalse then set the value of "a" to "test"

The result that is echoed is:

[echo] ${a}
[echo] true

The property is set to "true" because it was false, but what is the purpose of "value" then?

thank you

Chris

Upvotes: 0

Views: 555

Answers (1)

Ian Roberts
Ian Roberts

Reputation: 122364

Ant properties are immutable - once set they cannot be changed. So you can't modify the value of "a" but you could set a different property conditionally. For the following slight modification of your problem statement:

if property "a" is false then set the value of b to "test"

you could use

<condition property="b" value="test">
  <isfalse value="${a}"/>
</condition>

The condition tag's property attribute is the property you're setting, and its value attribute is the value to set it to if the condition succeeds. The value you're testing is the value attribute on the isfalse.

Upvotes: 5

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