vb.net generate 2d barcode Best Practice I recommend using a properties file named build.properties to store any overridden in Java

Generation PDF 417 in Java Best Practice I recommend using a properties file named build.properties to store any overridden

Best Practice I recommend using a properties file named build.properties to store any overridden
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default values. This property file shouldn t be kept in the source-code repository but instead should add a sample properties file named build.properties.sample along with instructions on how to configure an individual build.properties file.
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Datatypes
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Ant s datatypes are primitive constructs that provide frequently required information in the processing of a buildfile. Their purpose is to simplify a task by encapsulating some information required and providing a simple way to manipulate it. Several of Ant s built-in datatypes provide a structure that encapsulates information about a set of related resources such as files, environment variables, or even complex mappings between input and output files. Knowing how to properly use the Ant s datatypes will help you keep your buildfiles simple and efficient.
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Datatypes and Properties in Action: A Simple Example
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Many of Ant s tasks need to manipulate a file or groups of files. A typical need in a build is to specify a set of JAR files to be included in the classpath for certain tasks. Imagine that you re building a simple application with a directory structure, as shown in Figure 3-4.
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Figure 3-4. Sample directory structure for datatypes and properties The sample buildfile in Listing 3-5 shows a build for which two path structures (datatypes) are defined, one with an id of class.path and the other with and id of all.source.path. These two datatypes are then used in the target named compile , which uses the javac task to compile the classes referenced by the path reference by the id all.source.path. Listing 3-5. Simple Ant Buildfile Showing Datatypes < xml version="1.0" > <project name="My Project" default="all" basedir="."> ... <property name="lib" location="lib"/> <property name="src" location="src"/> <property name="classes" location="classes"/> <property name="build" location="build"/> <property name="src-java" location="${src}/java"/> <property name="src-test" location="${src}/test"/> <property name="some-lib" location="${lib}/some-lib"/> ... <path id="class.path"> <fileset dir="${lib}"> <include name="*.jar"/>
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</fileset> <fileset dir="${some-lib}"> <include name="*.jar"/> </fileset> </path> <path id="all.source.path"> <pathelement path="${src-java}"/> <pathelement path="${src-test}"/> </path> ... <target name="compile" description="Compiles all sources."> ... <javac destdir="${classes}" classpathref="class.path" debug="on" deprecation="on" optimize="off"> <src> <path refid="all.source.path"/> </src> </javac> </target> The class.path path structure uses two instances of the fileset datatype to group under a common classpath all the JAR files included in the directories referenced by the lib and struts-lib properties. The pathelement is an example of an indispensable datatype that enables you to reuse path information in your builds. The fileset datatype is a typical example of Ant s pathlike structures. It encapsulates a group of files defined via nested patternset structures. For example, to create a fileset that includes all JAR files under the ${lib} directory, you can use the following fileset definition: <fileset dir="${lib}"> <patternset> <include name="*.jar"/> </patternset> </fileset> The fileset datatype contains an implicit patternset structure, which means that you can use shorthand to rewrite the fileset definition as follows: <fileset dir="${lib}"> <include name="*.jar"/> </fileset> We can further compact the fileset definition by using the include as a property rather than as a nested element: <fileset dir="${lib}" include="*.jar" />
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CHAPTER 3 BUILDING WITH ANT
The path datatype can also make use of nested pathelements, as shown in the definition of the all.source.path path structure. It uses the pathelement datatype to reference the locations defined by src-java and src-generated properties. Path is a typical Ant pathlike structure. When dealing with paths or classpaths, Ant s task makes use of pathlike structures to perform its function. In the previous example, you can see that the two pathelements defined at the top of the buildfile are then used by reference in the context of the javac task. The class.path path is passed to the classpathref attribute of javac to determine the classpath for compilation and the all.source.path is used by creating a new pathelement, which is nested inside the src nested element of the javac task. As a build s complexity increases so do the patterns for selecting files. Pathlike structures enable the reuse of path information and help keep the growth of buildfiles under control.
Note One of the criteria used in choosing many of the tools in this chapter was whether the tool provided
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