Formatting Source Code programmatically with JDT

Question

I am generating some classes with JDT. Afterwards I would like to format the whole ICompilationUnit, just as if I pressed Ctrl+Shift+F (Source > Format) in an open Editor wi

Answer 1

This could be a bug, but using the JDK in Elcipse 4.2.2, it is necessary to create a working copy of the ICompilationUnit in order to apply a TextEdit to the file.

    targetUnit.becomeWorkingCopy(new SubProgressMonitor(monitor, 1));
    ... do work on the source file ...
    formatUnitSourceCode(targetUnit, new SubProgressMonitor(monitor, 1));
    targetUnit.commitWorkingCopy(true, new SubProgressMonitor(monitor, 1));

The formatting itself is done like this:

public static void formatUnitSourceCode(ICompilationUnit unit, IProgressMonitor monitor) throws JavaModelException {
    CodeFormatter formatter = ToolFactory.createCodeFormatter(null);
    ISourceRange range = unit.getSourceRange();
    TextEdit formatEdit = formatter.format(CodeFormatter.K_COMPILATION_UNIT, unit.getSource(), range.getOffset(), range.getLength(), 0, null);
    if (formatEdit != null && formatEdit.hasChildren()) {
        unit.applyTextEdit(formatEdit, monitor);
    } else {
        monitor.done();
    }
}