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Since you can use properties anywhere in the build script, they are extremely powerful: it is possible to parameterize any attribute. The NAnt documentation describes the attributes of properties as shown in Table 2-5. Table 2-5. Property Task Attributes
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name value dynamic
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string string bool
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Specifies the name of the NAnt property to set. Specifies the value to assign to the NAnt property. Specifies whether references to other properties should not be expanded when the value of the property is set, but expanded when the property is actually used. The default is false, meaning references to other properties will be expanded when the property value is set. Specifies whether or not the property is read-only. The default is false.
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True True False
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readonly
bool
False
CHAPTER 2 DISSECTING NANT
Attribute
failonerror if unless
Type
bool bool bool
Description
Determines if task failure stops the build or is just reported. The default is true. If set to true, then the task will be executed; otherwise, it will be skipped. The default is true. Opposite of if. If set to false, then the task will be executed; otherwise, it will be skipped. The default is false. Determines whether the task should report detailed build log messages. The default is false.
Required
False False False
verbose
bool
False
Clearly, the core requirements are to provide a name and value for a property. The other attributes have some potential uses, though.
dynamic
This can be a little confusing when used in a script, and it is best demonstrated through code. This attribute determines whether the property is expanded at the time it is set, or when it is used. You can see the effects using the following script: < xml version="1.0" encoding="utf-8" > <project name="Dynamic" default="go"> <property name="one" value="one"/> <property name="two" value="two"/> <property name="both" value="${one}${two}" dynamic="${dynamic}"/> <target name="go" depends="change"/> <target name="change"> <echo message="one=${one}"/> <echo message="two=${two}"/> <property name="one" value="three"/> <echo message="one=${one}"/> <echo message="both=${both}"/> </target> </project> We can see the effects of the dynamic switch by calling the script first with the default value, false: nant -D:dynamic=false This produces the following partial output: [echo] [echo] [echo] [echo] one=one two=two one=three both=onetwo
CHAPTER 2 DISSECTING NANT
Running with the dynamic value set to true produces different output: [echo] [echo] [echo] [echo] one=one two=two one=three both=threetwo
We can see that in the first instance, the property had been resolved at the set time because when we adjust the one property later on it has no effect. In the second instance, the property resolves as it is invoked. Subsequently changing the value of one will also be resolved correctly by both.
readonly
Similarly, if a property is marked as readonly, then it cannot be overwritten. Consider a similar build file to the one shown earlier. The effect can be seen here: < xml version="1.0" encoding="utf-8" > <project name="ReadOnlyProperty" default="go"> <target name="go"> <property name="alwaysthesame" value="true" readonly="true"/> <echo message="alwaysthesame = ${alwaysthesame}"/> <property name="alwaysthesame" value="false"/> <echo message="alwaysthesame = ${alwaysthesame}"/> </target> </project> The results are the same, although the reason is different. In this case, the property is readonly so no overwrite is allowed to take place: ---------- NAnt ---------NAnt 0.85 Copyright (C) 2001-2003 Gerry Shaw http://nant.sourceforge.net Buildfile: file:///ReadOnlyProperty.build Target(s) specified: go go: [echo] alwaysthesame = true [echo] alwaysthesame = true BUILD SUCCEEDED Total time: 0.1 seconds. Output completed (2 sec consumed) - Normal Termination
CHAPTER 2 DISSECTING NANT
if and unless
These two attributes give us some control over property settings by allowing the evaluation of a Boolean value, usually a property. In the following example, we can see that usehat will be set to true if raining is true, whereas useumbrella requires raining to be true but windy to be false owing to the unless attribute. < xml version="1.0" encoding="utf-8" > <project name="IfUnlessProperty" default="go"> <target name="go"> <property name="usehat" value="false"/> <property name="useumbrella" value="false"/> <property name="raining" value="true"/> <property name="windy" value="true"/> <property name="usehat" value="true" if="${raining}"/> <property name="useumbrella" value="true" if="${raining}" unless="${windy}"/> <echo message="usehat = ${usehat}"/> <echo message="useumbrella = ${useumbrella}"/> </target> </project> Therefore, the results are that usehat becomes true, but useumbrella remains false: ---------- NAnt ---------NAnt 0.85 Copyright (C) 2001-2003 Gerry Shaw http://nant.sourceforge.net Buildfile: file:///IfUnlessProperty.build Target(s) specified: go go: [echo] usehat = true [echo] useumbrella = false BUILD SUCCEEDED Total time: 0.1 seconds. Output completed (2 sec consumed) - Normal Termination
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