Question

我有一个IResourceChangeListener来监听工作区中的更改。但是我无法仅返回触发IResourceChangeEvent的类。

这就是我目前所拥有的：

public class ResourceChangeListener implements IResourceChangeListener {

    private Logger logger = Logger.getAnonymousLogger();

    public void resourceChanged(IResourceChangeEvent event) {
        IResourceDelta[] allChanges = event.getDelta().getAffectedChildren();

        for(IResourceDelta delta : allChanges) {
            // only check projects when there are actual changes (4 = CHANGED)
            if(delta.getKind() == 4) {
                try {
                    IPackageFragment[] packages = JavaCore.create(delta.getResource().getProject()).getPackageFragments();
                    IPackageFragment myPackage = null;

                    // get current project package
                    for(IPackageFragment currentPackage : packages) {
                        if(currentPackage.getKind() == IPackageFragmentRoot.K_SOURCE) {
                            myPackage = currentPackage;
                        }
                    }

                    // get all compilation units from package and parse them for new achievements
                    ICompilationUnit[] units = myPackage.getCompilationUnits();
                    for(ICompilationUnit unit : units) {
                        // do something with ICompilationUnits
                    }
                }
                catch (JavaModelException e) {
                    // catch exception here
                }
            }
        }
    }

}

此尝试返回受影响的整个包。因此，我只能遍历其中的所有ICompilationUnits。

与此相反，我的目标是获得实际发生变化的课程。这有可能吗？

Answer 1

感谢greg，我得到了解决方案。

我的初级课程现在看起来像这样：

public class ResourceChangeListener implements IResourceChangeListener {

    private Logger logger = Logger.getAnonymousLogger();

    public void resourceChanged(IResourceChangeEvent event) {
        IResourceDelta[] allChanges = event.getDelta().getAffectedChildren();

        for(IResourceDelta delta : allChanges) {
            if(delta.getKind() == 4) {  // only check projects when there are actual changes (4 = CHANGED)
                try {
                    // visits resource deltas
                    ResourceDeltaVisitor resourceDeltaVisitor = new ResourceDeltaVisitor();
                    delta.accept(resourceDeltaVisitor);
                    ArrayList<IResource> changedClasses = resourceDeltaVisitor.getChangedResources();

                    for(IResource changedClass : changedClasses) {
                        ICompilationUnit iCompilationUnit = (ICompilationUnit)JavaCore.create(changedClass);
                        // do something with ICompilationUnits...
                    }
                }
                catch (CoreException e1) {
                    // catch exception here
                }
            }
        }
    }

}

我的ResourceDeltaVisitor课程如下：

public class ResourceDeltaVisitor implements IResourceDeltaVisitor {

    private ArrayList<IResource> changedClasses = new ArrayList<IResource>();

    public boolean visit(IResourceDelta delta) {
        IResource res = delta.getResource();
        if(res.getName().endsWith(".java")) {
            addResource(res);
        }
        return true; // visit the children
    }

    public ArrayList<IResource> getChangedResources() {
        return changedClasses;
    }

    private void addResource(IResource res) {
        changedClasses.add(res);
    }
}

这不是最佳解决方案，但它对我有用。

Eclipse插件：从IResourceChangeListener返回受影响的类

1 个答案: