自定义Eclipse重构的预览出错

时间：2009-11-18 11:03:05

标签： java eclipse refactoring eclipse-plugin

我正在实施一个新的eclipse重构。这将使开发人员能够将preconditions语句从子方法提取到父方法。

当我在重构向导中选择“完成”时，这一切都很完美，但是当我选择“预览”时，我收到错误“没有提供目标编辑”。这似乎是由TextEdit返回的ASTRewrite.rewriteAST()中的问题引起的。但是我无法弄明白为什么。

在我的Refactoring.createChange()代码运行后，异常的堆栈跟踪发生，并且更改用于生成预览。

org.eclipse.text.edits.MalformedTreeException: No target edit provided.
at org.eclipse.text.edits.MoveSourceEdit.performConsistencyCheck(MoveSourceEdit.java:208)
at org.eclipse.text.edits.TextEdit.traverseConsistencyCheck(TextEdit.java:873)
at org.eclipse.text.edits.MoveSourceEdit.traverseConsistencyCheck(MoveSourceEdit.java:183)
at org.eclipse.text.edits.TextEdit.traverseConsistencyCheck(TextEdit.java:869)
at org.eclipse.text.edits.TextEdit.traverseConsistencyCheck(TextEdit.java:869)
at org.eclipse.text.edits.TextEditProcessor.checkIntegrityDo(TextEditProcessor.java:176)
at org.eclipse.text.edits.TextEdit.dispatchCheckIntegrity(TextEdit.java:743)
at org.eclipse.text.edits.TextEditProcessor.performEdits(TextEditProcessor.java:151)
at org.eclipse.ltk.core.refactoring.TextChange.getPreviewDocument(TextChange.java:534)
at org.eclipse.ltk.core.refactoring.TextChange.getPreviewDocument(TextChange.java:403)
at org.eclipse.ltk.core.refactoring.TextChange.getPreviewContent(TextChange.java:411)
at org.eclipse.ltk.internal.ui.refactoring.TextEditChangePreviewViewer.setInput(TextEditChangePreviewViewer.java:209)
at org.eclipse.ltk.internal.ui.refactoring.AbstractChangeNode.feedInput(AbstractChangeNode.java:99)
at org.eclipse.ltk.internal.ui.refactoring.PreviewWizardPage.showPreview(PreviewWizardPage.java:598)
at org.eclipse.ltk.internal.ui.refactoring.PreviewWizardPage.access$6(PreviewWizardPage.java:583)
at org.eclipse.ltk.internal.ui.refactoring.PreviewWizardPage$7.selectionChanged(PreviewWizardPage.java:574)
at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:162)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.runtime.Platform.run(Platform.java:888)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:160)
at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:2132)
at org.eclipse.jface.viewers.StructuredViewer.setSelection(StructuredViewer.java:1669)
at org.eclipse.jface.viewers.TreeViewer.setSelection(TreeViewer.java:1124)
at org.eclipse.jface.viewers.Viewer.setSelection(Viewer.java:392)
at org.eclipse.ltk.internal.ui.refactoring.PreviewWizardPage.setVisible(PreviewWizardPage.java:505)
at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.makeVisible(RefactoringWizardDialog2.java:762)
at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.showCurrentPage(RefactoringWizardDialog2.java:477)
at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.nextOrPreviewPressed(RefactoringWizardDialog2.java:507)
at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.access$2(RefactoringWizardDialog2.java:492)
at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2$1.widgetSelected(RefactoringWizardDialog2.java:691)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3880)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3473)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
at org.eclipse.jface.window.Window.open(Window.java:801)
at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation$1.run(RefactoringWizardOpenOperation.java:143)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation.run(RefactoringWizardOpenOperation.java:155)
at org.jmlspecs.eclipse.refactor.action.AbstractMethodActionDelegate.run(AbstractMethodActionDelegate.java:78)
at org.jmlspecs.eclipse.refactor.action.AbstractMethodActionDelegate.run(AbstractMethodActionDelegate.java:67)
at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:251)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)
at org.eclipse.jface.action.ActionContributionItem$6.handleEvent(ActionContributionItem.java:452)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3880)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3473)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
at org.eclipse.equinox.launcher.Main.main(Main.java:1287)

目前执行更改的代码如下所示：

CompilationUnit sourceNode = ...
ASTRewrite sourceRewrite = ASTRewrite.create(sourceNode.getAST());

Statement statement = ...
sourceRewrite.createMoveTarget(statement);

CompilationUnit destinationNode = ...
MethodDeclaration destinationMethod = ...
ASTRewrite destinationRewrite = ASTRewrite.create(destinationNode.getAST());

ListRewrite lrw = destinationRewrite.getListRewrite(destinationMethod.getBody(),
    Block.STATEMENTS_PROPERTY);

lrw.insertFirst(statement, null);

我知道使用createMoveTarget的方式并不是如何记录的，但是当我按照下面的文档进行操作时，语句会从源代码中删除但不会移动到目标位置，我仍然会得到相同的预览中出错。

CompilationUnit sourceNode = ...
ASTRewrite sourceRewrite = ASTRewrite.create(sourceNode.getAST());

Statement statement = ...
Statement replacement = sourceRewrite.createMoveTarget(statement);
sourceRewrite.remove(statement, null);

CompilationUnit destinationNode = ...
MethodDeclaration destinationMethod = ...
ASTRewrite destinationRewrite = ASTRewrite.create(destinationNode.getAST());

ListRewrite lrw = destinationRewrite.getListRewrite(destinationMethod.getBody(),
    Block.STATEMENTS_PROPERTY);

lrw.insertFirst(replacement, null);

以下是正在执行重构的示例。

在：

class A {
    foo(int a) {
        return a * 2;
    }
}

class B {
    foo(int a) {
        JC.requires(a > 1);

        return a * 3;
    }
}

后：

class A {
    foo(int a) {
        JC.requires(a > 1);

        return a * 2;
    }
}

class B extends A {
    foo(int a) {        
        return a * 3;
    }
}

1 个答案:

答案 0 :(得分：2)

我发现eclipse.org文章对我开始是最有帮助的。

开始调试代码的好地方是在org.eclipse.jdt.core.dom.rewrite.ASTRewrite上设置断点，特别是rewriteAST（）方法，然后触发一些重构。

以下是您可能会觉得有用的一些内容。您是在寻找特别的东西还是如何处理AST？

http://www.ibm.com/developerworks/opensource/library/os-ast/  
http://blog.sahits.ch/?p=228
http://www.vogella.com/articles/EclipseJDT/article.html
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