I either could not get the ones I found working, or they were just too
complicated. Here is the one I wrote which is not a for loop, but can become
one by maintaining your own index property and setting the if value to the loop
maximum.
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.MacroDef;
import org.apache.tools.ant.taskdefs.MacroInstance;
public class WhileTask extends Task {
protected String _property = null;
protected String _ifVal = null;
protected String _unlessVal = null;
protected boolean _keepgoing = false;
protected MacroDef _macroDef = null;
protected int _taskCount = 0;
protected int _errorCount = 0;
public WhileTask()
{
}
public void setKeepgoing(boolean keepgoing)
{
_keepgoing = keepgoing;
}
public void setProperty(String property)
{
_property = property;
}
public void setIf(String ifVal)
{
_ifVal = ifVal;
}
public void setUnless(String unlessVal)
{
_unlessVal = unlessVal;
}
public Object createSequential()
{
_macroDef = new MacroDef();
_macroDef.setProject(getProject());
return(_macroDef.createSequential());
}
public void execute()
{
if(_property == null)
throw new BuildException("You must supply a property name to check
terminating conditions on");
if((_ifVal == null) && (_unlessVal == null))
throw new BuildException("You must supply either an if value or unless
value for termination of the while loop");
if(_macroDef == null)
throw new BuildException("You must supply an embedded sequential to
perform");
doTheTasks();
}
protected void doSequentialIteration()
{
MacroInstance instance = new MacroInstance();
instance.setProject(getProject());
instance.setOwningTarget(getOwningTarget());
instance.setMacroDef(_macroDef);
instance.execute();
}
protected void doTask()
{
try {
_taskCount++;
doSequentialIteration();
} catch(BuildException be) {
if(_keepgoing) {
_errorCount++;
} else {
throw be;
}
}
}
protected void doTheTasks()
{
_errorCount = 0;
_taskCount = 0;
Project proj = getProject();
if(!proj.getProperties().containsKey(_property))
throw new BuildException("Property: " + _property + " does not exist");
String propVal = proj.getProperty(_property);
while(((_ifVal != null) && (propVal.equals(_ifVal))) || ((_unlessVal !=
null) && (!propVal.equals(_unlessVal)))) {
doTask();
propVal = proj.getProperty(_property);
}
if((_keepgoing) && (_errorCount != 0))
throw new BuildException("Keepgoing execution: " + _errorCount + " of " +
_taskCount + " iterations failed.");
}
}
Shawn Castrianni
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