如何识别来自 Eclipse 中 CompareEditorInput 的文本选择事件的来源？

Question

在我的 eclipse 插件中，我有以下代码：

public class MyHandler extends AbstractHandler {
    @Override
    public Object execute( ExecutionEvent event ) throws ExecutionException {
        ISelection sel = HandlerUtil
            .getActiveWorkbenchWindowChecked( event )
            .getSelectionService()
            .getSelection();

        if( sel instanceof TextSelection ) {
            IEditorPart activeEditor = PlatformUI
                    .getWorkbench()
                    .getActiveWorkbenchWindow()
                    .getActivePage()
                    .getActiveEditor();
            IEditorInput editorInput = activeEditor.getEditorInput();

            if( editorInput instanceof CompareEditorInput ) {
                // here are two possible sources of the text selection, the
                // left or the right side of the compare editor.

                // How can I find out, which side it is from?
            }
        }
        return null;
    }
}

这里我正在处理来自 CompareEditorInput 的文本选择事件，即将文件的两个远程版本与 subclipse 进行比较的结果。

现在我想正确处理文本选择。为此，我必须知道它是否选择左侧编辑器内或右侧编辑器内的某些文本。

我怎样才能找到它？

编辑2010-04-10：

CompareEditorInput 的具体实例是org.tigris.subversion.subclipse.ui.compare.SVNCompareEditorInput。

Answer 1

问题是： org.eclipse.compare.CompareEditorInput （其具有 java 源代码）是一个抽象类，它并不总是“左”或“右”窗格：

/**
 * The most important part of this implementation is the setup 
 *  of the compare/merge UI.
 * The UI uses a simple browser metaphor to present compare results.
 * The top half of the layout shows the structural compare results 
 *  (e.g. added, deleted, and changed files),
 * The bottom half the content compare results  
 *  (e.g. textual differences between two files).
 * A selection in the top pane is fed to the bottom pane. 
 * If a content viewer is registered for the type of the selected object, 
 *  this viewer is installed in the pane.
 * In addition if a structure viewer is registered for the selection type,
 *  the top pane is split horizontally to make room for another pane 
 *  and the structure viewer is installed in it. 
 * When comparing Java files this second structure viewer would show 
 *  the structural differences within a Java file, 
 *  e.g. added, deleted or changed methods and fields.
 */

问题是：你知道它的确切实现类型吗？这个CompareEditorInput 对象？

即：看看具体类如何处理选择很有趣：
org.eclipse.compare.internal。 ResourceCompareInput 例如处理 < code>org.eclipse.jface.viewers.IStructuredSelection，并附带 根据选择获取左右 IResource 的实用函数。