Support Source Edit in Compare with Clipboard

Support for modifying source in compare clipboard editor and Use
MultiPageEditorPart for getting active editor and in ClipboardReplace &
Clipboard Compare

Author: SougandhS

team/bundles/org.eclipse.compare/compare/org/eclipse/compare/internal/ClipboardCompare.java

@@ -13,193 +13,30 @@
  *******************************************************************************/
 package org.eclipse.compare.internal;
 
-import java.io.ByteArrayInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.lang.reflect.InvocationTargetException;
-import java.nio.charset.StandardCharsets;
-
-import org.eclipse.compare.CompareConfiguration;
-import org.eclipse.compare.CompareEditorInput;
-import org.eclipse.compare.CompareUI;
-import org.eclipse.compare.IEncodedStreamContentAccessor;
-import org.eclipse.compare.ITypedElement;
-import org.eclipse.compare.structuremergeviewer.DiffNode;
 import org.eclipse.core.resources.IFile;
-import org.eclipse.core.runtime.CoreException;
-import org.eclipse.core.runtime.IProgressMonitor;
-import org.eclipse.jface.action.IAction;
 import org.eclipse.jface.dialogs.MessageDialog;
-import org.eclipse.jface.text.ITextSelection;
 import org.eclipse.jface.viewers.ISelection;
-import org.eclipse.osgi.util.NLS;
-import org.eclipse.swt.dnd.Clipboard;
-import org.eclipse.swt.dnd.TextTransfer;
-import org.eclipse.swt.graphics.Image;
-import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Shell;
-import org.eclipse.ui.IEditorPart;
-import org.eclipse.ui.IObjectActionDelegate;
-import org.eclipse.ui.IViewPart;
-import org.eclipse.ui.IWorkbenchPage;
-import org.eclipse.ui.IWorkbenchPart;
-import org.eclipse.ui.PlatformUI;
-import org.eclipse.ui.forms.editor.FormEditor;
-import org.eclipse.ui.texteditor.ITextEditor;
-
-public class ClipboardCompare extends BaseCompareAction implements IObjectActionDelegate {
 
-	private final String clipboard = "Clipboard"; //$NON-NLS-1$
-	private final String compareFailed = "Comparision Failed"; //$NON-NLS-1$
 
-	private IWorkbenchPart activePart;
+public class ClipboardCompare extends BaseCompareAction {
 
 	@Override
 	protected void run(ISelection selection) {
 		IFile[] files = Utilities.getFiles(selection);
 		Shell parentShell = CompareUIPlugin.getShell();
 		for (IFile file : files) {
 			try {
-				processComparison(file, parentShell);
+				ClipboardCompareProcess pro = new ClipboardCompareProcess();
+				pro.processComparison(parentShell, file);
 			} catch (Exception e) {
-				MessageDialog.openError(parentShell, compareFailed, e.getMessage());
+				MessageDialog.openError(parentShell, "Comparison Failed", e.getMessage()); //$NON-NLS-1$
 			}
 		}
 	}
-	@Override
-	protected boolean isEnabled(ISelection selection) {
-		return Utilities.getFiles(selection).length == 1 && getClipboard() != null;
-	}
-
-	/**
-	 * Process comparison with selection or entire editor contents with contents in
-	 * clipboard
-	 *
-	 * @param file        Editor file
-	 * @param parentShell The shell containing this window's controls
-	 * @throws IOException, CoreException
-	 */
-	private void processComparison(IFile file, Shell parentShell) throws IOException, CoreException {
-		String cb = getClipboard().toString();
-		String fileName = file.getName();
-		IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
-		IEditorPart editor = page.getActiveEditor();
-		if (activePart instanceof IViewPart) {
-			String fileContents = new String(file.getContents().readAllBytes(), file.getCharset());
-			showComparison(fileContents, fileName, cb, parentShell);
-			return;
-		}
-		final String selectionContents;
-		if (editor instanceof FormEditor fromEditor) {
-			editor = fromEditor.getActiveEditor();
-		}
-		if (editor instanceof ITextEditor txtEditor) {
-			ISelection selection = txtEditor.getSelectionProvider().getSelection();
-			if (selection instanceof ITextSelection textSelection) {
-				selectionContents = textSelection.getText();
-				if (selectionContents.isEmpty()) {
-					String fileContents = new String(file.getContents().readAllBytes(), file.getCharset());
-					showComparison(fileContents, fileName, cb, parentShell);
-				} else {
-					showComparison(selectionContents, fileName, cb, parentShell);
-				}
-				return;
-			}
-		}
-		if (editor instanceof CompareEditor existingCompare) { // if selection is from compare editor itself
-			ISelection selection = existingCompare.getSite().getSelectionProvider().getSelection();
-			if (selection instanceof ITextSelection textSelection) {
-				String selectedText = textSelection.getText();
-				String fileContents = new String(file.getContents().readAllBytes(), file.getCharset());
-				showComparison(fileContents, fileName, selectedText, parentShell);
-			}
-		}
-	}
-
-	/**
-	 * Shows comparison result
-	 *
-	 * @param source            Either selection from current editor or entire
-	 *                          editor if no selection
-	 * @param fileName          Editor file name
-	 * @param clipboardContents Contents in clipboard
-	 * @param parentShell       The shell containing this window's controls
-	 */
-	private void showComparison(String source, String fileName, String clipboardContents, Shell parentShell) {
-		class ClipboardTypedElement implements ITypedElement, IEncodedStreamContentAccessor {
-			private final String name;
-			private final String content;
-
-			public ClipboardTypedElement(String name, String content) {
-				this.name = name;
-				this.content = content;
-			}
-
-			@Override
-			public String getName() {
-				return name;
-			}
-
-			@Override
-			public Image getImage() {
-				return null;
-			}
-
-			@Override
-			public String getType() {
-				return null;
-			}
-
-			@Override
-			public String getCharset() throws CoreException {
-				return "UTF-8"; //$NON-NLS-1$
-			}
-
-			@Override
-			public InputStream getContents() throws CoreException {
-				return new ByteArrayInputStream(content.getBytes(StandardCharsets.UTF_8));
-			}
-
-		}
-		if (source == null) {
-			MessageDialog.openInformation(parentShell, compareFailed, "Failed to process selected file"); //$NON-NLS-1$
-			return;
-		}
-		CompareConfiguration config = new CompareConfiguration();
-		config.setLeftLabel(fileName);
-		config.setRightLabel(clipboard);
-		config.setLeftEditable(true);
-		config.setRightEditable(true);
-		CompareEditorInput compareInput = new CompareEditorInput(config) {
-			@Override
-			protected Object prepareInput(IProgressMonitor monitor)
-					throws InvocationTargetException, InterruptedException {
-				return new DiffNode(new ClipboardTypedElement(fileName, source),
-						new ClipboardTypedElement(clipboard, clipboardContents));
-
-			}
-		};
-		compareInput.setTitle(NLS.bind(CompareMessages.CompareWithClipboardTitle, fileName));
-		CompareUI.openCompareEditor(compareInput);
-	}
-
-	/**
-	 * Returns Clipboard Object or null if there is nothing in clipboard
-	 *
-	 * @returns Clipboard Object or null
-	 */
-	private Object getClipboard() {
-		Clipboard clip = new Clipboard(Display.getDefault());
-		try {
-			return clip.getContents(TextTransfer.getInstance());
-		} finally {
-			clip.dispose();
-		}
-	}
 
 	@Override
-	public void setActivePart(IAction action, IWorkbenchPart targetPart) {
-		this.activePart = targetPart;
+	protected boolean isEnabled(ISelection selection) {
+		return Utilities.getFiles(selection).length == 1 && ClipboardCompareProcess.getClipboard() != null;
 	}
-
-}
+}