I'd like to take a slightly different angle on the <import> issue by getting
some thoughts on this little experimental task I wrote. I haven't cleaned it
up at all (lots of unused imports, inner classes etc). Anyway it lets you
override any target in the build. e.g. This build file
<project name="override" default="test">
<taskdef name="override"
classname="org.apache.tools.ant.taskdefs.Override"/>
<taskdef name="super"
classname="org.apache.tools.ant.taskdefs.Override$Super"/>
<override target="test">
<echo message="pre"/>
<super/>
<echo message="post"/>
</override>
<override target="test">
<echo message="pre2"/>
<super/>
<echo message="post2"/>
</override>
<target name="test">
<echo message="test"/>
</target>
</project>
produces the following output
Buildfile: build.xml
test:
[echo] pre2
[echo] pre
[echo] test
[echo] post
[echo] post2
BUILD SUCCESSFUL
:-)
I think with a renaming <import> task this would let you override any part of
the build easily.
BTW, note that simple renaming of targets is not enough. Any use of a target
name needs to be updated too (e.g. <antcall>). Can be done (at time of use)
but may require tasks knowing their import prefix. The import task will need
this to do cascade renaming.
Anyway, just thought I'd throw it out there. Override might even be useful in
an entity includes approach.
Comments?
Conor
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package org.apache.tools.ant.taskdefs;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.lang.reflect.Method;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.BuildListener;
import org.apache.tools.ant.DefaultLogger;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.ProjectComponent;
import org.apache.tools.ant.ProjectHelper;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.TaskContainer;
import org.apache.tools.ant.Target;
import org.apache.tools.ant.types.PropertySet;
import org.apache.tools.ant.util.FileUtils;
import java.util.Map;
/*
* @author Conor MacNeill
*/
public class Override extends Task implements TaskContainer {
public static class OverrideTarget extends Target {
private Target original;
}
private String targetName;
private OverrideTarget override = new OverrideTarget();
public void setTarget(String targetName) {
this.targetName = targetName;
}
public void addTask(Task task) {
override.addTask(task);
task.setOwningTarget(override);
}
public void execute() {
Project project = getProject();
Map targets = project.getTargets();
override.original = (Target) targets.get(targetName);
override.setProject(project);
override.setName(targetName);
targets.put(targetName, override);
for (Enumeration e = override.original.getDependencies(); e.hasMoreElements();) {
String dependency = (String) e.nextElement();
override.addDependency(dependency);
}
}
public static class Super extends Task {
public void execute() {
Target owner = getOwningTarget();
if (owner instanceof OverrideTarget) {
Target original = ((OverrideTarget) owner).original;
original.execute();
}
}
}
}
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