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Running the target adds one more line to the compilation target s output; here stating that two files were deleted:
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compile: [depend] Deleted 2 out of date files in 0 seconds [javac] Compiling 3 source files to C:\AntBook\app\webapp\build\classes
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Because this task ensures that source code changes are picked up more reliably, we always use this task in our projects. Sometimes the fact that it cannot detect dependencies upon imported constants (static final data) catches us out, as their changes do not propagate: remember to clean build every time you change a public constant. A regular clean build is always a good idea. 10.2.4 Grammar parsing with JavaCC The Lucene indexing and search engine that we ve incorporated into our example application allows for sophisticated search expressions such as these:
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(foo OR bar) AND (baz OR boo) title:ftp AND NOT content:telnet
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Under the hood, Lucene s API can perform searches by using a Query object, which can be constructed either through the API directly (for example, a nested set of BooleanQuery objects), or more simply using the QueryParser, which takes expressions like those just shown and parses them into a Query object. The parsing of such expressions into Java objects can be done by using a grammar compiler. There are two grammar compilers with built-in Ant support: ANTLR and JavaCC. Because our particular application uses Lucene and because Lucene takes advantage of JavaCC, we feature it here. JavaCC is a Java grammar compiler that compiles .jj files into .java source code. The Lucene query parser, for example, is written using JavaCC, compiled into .java files during Lucene s build process, and then compiled using the standard <javac> task. If you re writing your own meta-language by using JavaCC, the Ant <javacc> task is the quickest way to integrate the two-step sequence into your build process. The <javacc> task is simply a wrapper around the JavaCC command-line compiler. Listing 10.4 is a piece of Lucene s own build file that uses the <javacc> task.
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Listing 10.4 Lucene s own build, which uses Ant s JavaCC task
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<target name="compile" depends="init,javacc_check" if="javacc.present"> <!-- ... --> Outputs to temporary directory <javacc target="${src.dir}/org/apache/lucene/queryParser/QueryParser.jj" javacchome="${javacc.zip.dir}" outputdirectory="${build.src}/org/apache/lucene/queryParser"/> <javac srcdir="${src.dir}:${build.src}" includes="org/**/*.java"
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Compiles both source trees
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destdir="${build.classes}" debug="${debug}"> <classpath refid="classpath"/> </javac> </target>
Regular expression replacement If you re coming from a Unix and a Make-based build, chances are you ll be wondering where sed, awk, and Perl are hiding in Ant. The <replaceregexp> task is not quite a full-fledged version of those handy tools, but it can be just what you need to solve some of those tricky build process issues. Let s demonstrate regular expression replacement with an example: an application uses a file display.properties to define sort.order as a comma-delimited list. The application uses this information to provide default sorting of names displayed.
sort.order=lastName,firstName
Suppose certain customers want to deviate from this default and swap the order. Rather than provide a separate properties file for each customer, we could use the <replaceregexp> task to maintain a single file and note the exceptions (perhaps in a customer-specific properties file loaded in Ant), as the following code illustrates:
<project name="Regexp" default="default"> <property name="customer" value="normal"/> <property file="${customer}.properties"/> <target name="init"> <delete dir="output"/> <mkdir dir="output"/> </target> <target name="default" depends="init" if="customer.different"> <copy file="display.properties" todir="output"/> <replaceregexp file="output/display.properties" match="sort.order=(.*),(.*)" replace="sort.order=\2,\1" byline="true" /> </target> </project>
The <replaceregexp> shown matches a comma-delimited sort.order line and replaces it with the two fields swapped. The <replaceregexp> task modifies files in place. Notice that the source file was copied to a working directory prior to replacement. Although the main point is to demonstrate a use of <replaceregexp>, the conditional flag was added to provide some insight into how Ant properties can be used to make life easier, even given exceptions to rules. In this example, an
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BEYOND ANT S CORE TASKS
acme.properties file could be provided with customer.different=true and Ant run with ant -Dcustomer=acme. Alternatively, customer.different could be enabled directly using ant -Dcustomer.different=yes.
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