Properties outside targets in Java

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Properties outside targets
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Properties are special in that they can be declared outside the scope of a target A property declared in such a manner is defined before any target is executed and is immutable For example, in the following build script
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<project name="Test" default="test" basedir=""> <property name="foo" value="xyz"/> <target name="test"> <echo message="foo=${foo}"/> <property name="foo" value="abc"/> <echo message="foo=${foo}"/> </target> </project>
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TT 19 Building a product
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the foo property is assigned its value before the test target is executed, and its value is not changed by the second property task within the test target
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Buildfile: mutability_test_2xml test: [echo] foo=xyz [echo] foo=xyz BUILD SUCCESSFUL Total time: 188 milliseconds
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Properties on the command line
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Properties can also be declared outside of the build script A property declared on the command line is defined before the build is launched and is immutable
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a brief introduction to Ant
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Figure 19-2 Declaring a property as part of the Ant command line
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For example, if we execute the build script described in the prior section (see Section 19144) using the Run Ant command, switch to the
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TT 19 Building a product
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Main tab panel (see Figure 19-2), and enter the following in the Arguments field
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-Dfoo=mop
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then the foo property is assigned its value before the build script is executed, and its value is not changed by the property declaration or property task within the build script
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Buildfile: mutability_test_2xml test: [echo] foo=mop [echo] foo=mop BUILD SUCCESSFUL Total time: 297 milliseconds
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Alternately, properties can be specified by switching to the Properties tab panel (see Figure 19-3) and unchecking the Use global properties checkbox The top part of the page contains individual property declarations, while the bottom part displays a list of files that contain property declarations
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a brief introduction to Ant
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Figure 19-3 Declaring properties and property files applicable to an individual build script
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If you want to specify properties applicable to all build scripts in the workspace, open the Eclipse preference dialog and navigating to the Ant >
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TT 19 Building a product
Runtime preference page (see Figure 19-4) Similar to the Properties tab panel show above, the top part of the preference page contains individual property declarations, while the bottom part displays a list of files that contain property declarations
Figure 19-4 Declaring properties and property files applicable to all build scripts in the workspace
a brief introduction to Ant
<antcall> task
The <antcall> tasks has some unusual aspects worthy of discussion Parameters specified in an <antcall> task override any properties specified elsewhere For example, if the following build script is executed
< xml version="10" encoding="UTF-8" > <project name="Test" default="test" basedir=""> <target name="init"> <property name="foo" value="xyz"/> <echo message="in init, foo=${foo}"/> <property name="foo" value="123"/> <echo message="in init, foo=${foo}"/> </target> <target name="test" depends="init"> <echo message="in test, foo=${foo}"/> <antcall target="sub"> <param name="foo" value="gob"/> </antcall> <echo message="in test, foo=${foo}"/> </target> <target name="sub"> <echo message="in sub, foo=${foo}"/> <property name="foo" value="abc"/> <echo message="in sub, foo=${foo}"/> </target> </project>
the foo property is assigned in the init target and should be immutable (see Section 19143) However, because foo is specified as a parameter in the <antcall> task, the value is modified for the duration of the <antcall> task; its original value is restored when the <antcall> task completes
TT 19 Building a product
Buildfile: mutability_test_3xml init: [echo] in init, foo=xyz [echo] in init, foo=xyz test: [echo] in test, foo=xyz sub: [echo] in sub, foo=gob [echo] in sub, foo=gob [echo] in test, foo=xyz BUILD SUCCESSFUL Total time: 282 milliseconds
The <antcall> task resets the depends calculations so that targets may be executed twice Consider the prior build script with a slight modification:
< xml version="10" encoding="UTF-8" > <project name="Test" default="test" basedir=""> <target name="init"> <property name="foo" value="xyz"/> <echo message="in init, foo=${foo}"/> <property name="foo" value="123"/> <echo message="in init, foo=${foo}"/> </target> <target name="test" depends="init"> <echo message="in test, foo=${foo}"/> <antcall target="sub"> <param name="foo" value="gob"/> </antcall> <echo message="in test, foo=${foo}"/> </target> <target name="sub" depends="init"> <echo message="in sub, foo=${foo}"/> <property name="foo" value="abc"/> <echo message="in sub, foo=${foo}"/> </target> </project>
This modification makes the sub target dependent upon the init target Even though the init target is executed prior to the test target, the init tar-
a brief introduction to Ant
get is executed a second time before the sub target because the sub target was executed using the <antcall> task In addition, the value for the foo property is different the second time the init target is executed, but as discussed above returns to its original value when the <antcall> task completes:
Buildfile: mutability_test_4xml init: [echo] in init, foo=xyz [echo] in init, foo=xyz test: [echo] in test, foo=xyz init: [echo] in init, foo=gob [echo] in init, foo=gob sub: [echo] in sub, foo=gob [echo] in sub, foo=gob [echo] in test, foo=xyz BUILD SUCCESSFUL Total time: 375 milliseconds