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<delete> <fileset dir="${src.dir}" includes="*~" defaultexcludes="false" /> </delete>
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Here, as well as providing a pattern to delete, we have told the task to ignore the default exclusion patterns. We introduced these patterns in section 3.4.2. Usually, automatically omitting editor- and SCM-generated backup files is useful, but when trying to delete such files you need to turn this filtering off. Setting the defaultexcludes attribute to false has this effect. There are two Boolean attributes, quiet and failonerror, that tell the task how to behave when something can t be deleted. This happens quite often if a program has a lock on a file, such as when a JAR is loaded into an application server. It also happens when Windows Explorer has a directory listed in a window, preventing Ant from deleting the directory. When the failonerror flag is set, as it is by default, Ant reports the error and the build breaks. If the flag is false, then Ant reports the error before it continues to delete the remaining the files. You can tell that something went wrong, but the build continues:
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<delete defaultexcludes="false" failonerror="false" > <fileset dir="${src.dir}" includes="*.~"/> </delete>
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The quiet option is nearly the exact opposite of failonerror. When quiet="true", errors are not reported and the build continues. Setting this flag implies you don t care whether the deletion worked, and don t want any information if it doesn t. It is the equivalent of rm -q in Unix. There is also a verbose flag that causes the task to list all the files as it goes. This can be useful for verifying that it does clean up:
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<delete failonerror="false" verbose="true"> <fileset dir="${src.dir}" includes="*.bak"/> </delete>
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Using this combination of verbose output with errors logged but ignored makes it easy to notice when a file was not deleted, and which files were. This is useful if you can delete the file by hand afterward, or just rerun the task a second time with more windows and applications closed. We should warn that the <delete dir> option is unforgiving, as it can silently delete everything in the specified directory and those below it. If you have accidentally set the directory attribute to the current directory (dir="."), then the entire project will be destroyed. This will happen regardless of any settings in nested filesets. Setting the directory to root, (dir="/"), would be even more destructive. 6.1.2 How to copy files The task to copy files is, of course, <copy>. At its simplest, you can copy files from somewhere, to somewhere else. You can specify the destination directory, which the task creates if it is not already present:
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<copy file="readme.txt" todir="doc"/>
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You can also give the complete destination file name, which renames the file during the copy:
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<copy file="readme.txt" tofile="doc/README"/>
The task performs bulk copies when you specify a fileset inside the copy task; you must also specify the destination directory with the todir attribute and omit the tofile attribute:
<copy todir="${dist.bin.dir}"> <fileset dir="src/scripts" > <include name="**/*.*"/> </fileset> </copy>
Be aware that <copy> is timestamp-aware by default; sometimes that can catch you out. One of the authors used Ant to install a web application off a CD onto a server, but one system wouldn t upgrade because the CD file was older than the dates of the file installed on the server. A build file that had worked for months suddenly broke. The solution to such a problem is to set overwrite="true", which tells Ant to overwrite the file regardless of timestamp differences. Another point to note is <copy> gives the file a timestamp of the current time. You can request that the date of the original file is propagated to the new file, by setting preservelastmodified="true". This may be useful, even though we have not used it ourselves. If you want to change the names of files when copying or moving them, or change the directory layout as you do so, you can specify a <mapper> as a nested element of the task. We introduced mappers in chapter 3; packaging is one of the times where you may want to make use of them. 6.1.3 How to move files To move files around, use the <move> task. It first tries to rename the file or directory; if this fails then it copies the files and deletes the originals. Note that this is a change in Ant 1.5; previous versions always copied files, even when a rename was possible. The syntax of this task is nearly identical to <copy>, as it is a direct subclass of the <copy> task, so any of the examples listed in section 6.1.2 can be renamed and used to move files:
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