/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.ui.text.correction.proposals;
import org.eclipse.swt.graphics.Image;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.text.edits.CopyTargetEdit;
import org.eclipse.text.edits.DeleteEdit;
import org.eclipse.text.edits.InsertEdit;
import org.eclipse.text.edits.MoveSourceEdit;
import org.eclipse.text.edits.MoveTargetEdit;
import org.eclipse.text.edits.MultiTextEdit;
import org.eclipse.text.edits.ReplaceEdit;
import org.eclipse.text.edits.TextEdit;
import org.eclipse.text.edits.TextEditVisitor;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.ltk.core.refactoring.Change;
import org.eclipse.ltk.core.refactoring.DocumentChange;
import org.eclipse.ltk.core.refactoring.TextChange;
import org.eclipse.ltk.core.refactoring.TextFileChange;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.refactoring.CompilationUnitChange;
import org.eclipse.jdt.internal.corext.codemanipulation.StubUtility;
import org.eclipse.jdt.internal.corext.fix.LinkedProposalModel;
import org.eclipse.jdt.internal.corext.fix.LinkedProposalPositionGroup;
import org.eclipse.jdt.internal.corext.util.Resources;
import org.eclipse.jdt.internal.corext.util.Strings;
import org.eclipse.jdt.ui.JavaUI;
import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.internal.ui.JavaUIStatus;
import org.eclipse.jdt.internal.ui.javaeditor.EditorUtility;
import org.eclipse.jdt.internal.ui.javaeditor.JavaEditor;
import org.eclipse.jdt.internal.ui.text.correction.CorrectionMessages;
import org.eclipse.jdt.internal.ui.util.ExceptionHandler;
import org.eclipse.jdt.internal.ui.viewsupport.LinkedProposalModelPresenter;
/**
* A proposal for quick fixes and quick assist that work on a single compilation unit.
* Either a {@link TextChange text change} is directly passed in the constructor or method
* {@link #addEdits(IDocument, TextEdit)} is overridden to provide the text edits that are
* applied to the document when the proposal is evaluated.
* <p>
* The proposal takes care of the preview of the changes as proposal information.
* </p>
* @since 3.2
*/
public class CUCorrectionProposal extends ChangeCorrectionProposal {
private ICompilationUnit fCompilationUnit;
private LinkedProposalModel fLinkedProposalModel;
/**
* Constructs a correction proposal working on a compilation unit with a given text change
*
* @param name the name that is displayed in the proposal selection dialog.
* @param cu the compilation unit on that the change works.
* @param change the change that is executed when the proposal is applied or <code>null</code>
* if implementors override {@link #addEdits(IDocument, TextEdit)} to provide
* the text edits or {@link #createTextChange()} to provide a text change.
* @param relevance the relevance of this proposal.
* @param image the image that is displayed for this proposal or <code>null</code> if no
* image is desired.
*/
public CUCorrectionProposal(String name, ICompilationUnit cu, TextChange change, int relevance, Image image) {
super(name, change, relevance, image);
if (cu == null) {
throw new IllegalArgumentException("Compilation unit must not be null"); //$NON-NLS-1$
}
fCompilationUnit= cu;
fLinkedProposalModel= null;
}
/**
* Constructs a correction proposal working on a compilation unit.
* <p>Users have to override {@link #addEdits(IDocument, TextEdit)} to provide
* the text edits or {@link #createTextChange()} to provide a text change.
* </p>
*
* @param name The name that is displayed in the proposal selection dialog.
* @param cu The compilation unit on that the change works.
* @param relevance The relevance of this proposal.
* @param image The image that is displayed for this proposal or <code>null</code> if no
* image is desired.
*/
protected CUCorrectionProposal(String name, ICompilationUnit cu, int relevance, Image image) {
this(name, cu, null, relevance, image);
}
/**
* Called when the {@link CompilationUnitChange} is initialized. Subclasses can override to
* add text edits to the root edit of the change. Implementors must not access the proposal,
* e.g getting the change.
* <p>The default implementation does not add any edits</p>
*
* @param document content of the underlying compilation unit. To be accessed read only.
* @param editRoot The root edit to add all edits to
* @throws CoreException can be thrown if adding the edits is failing.
*/
protected void addEdits(IDocument document, TextEdit editRoot) throws CoreException {
}
protected LinkedProposalModel getLinkedProposalModel() {
if (fLinkedProposalModel == null) {
fLinkedProposalModel= new LinkedProposalModel();
}
return fLinkedProposalModel;
}
public void setLinkedProposalModel(LinkedProposalModel model) {
fLinkedProposalModel= model;
}
public Object getAdditionalProposalInfo(IProgressMonitor monitor) {
final StringBuffer buf= new StringBuffer();
try {
final TextChange change= getTextChange();
change.setKeepPreviewEdits(true);
final IDocument previewContent= change.getPreviewDocument(monitor);
final TextEdit rootEdit= change.getPreviewEdit(change.getEdit());
class EditAnnotator extends TextEditVisitor {
private int fWrittenToPos = 0;
public void unchangedUntil(int pos) {
if (pos > fWrittenToPos) {
appendContent(previewContent, fWrittenToPos, pos, buf, true);
fWrittenToPos = pos;
}
}
public boolean visit(MoveTargetEdit edit) {
return true; //rangeAdded(edit);
}
public boolean visit(CopyTargetEdit edit) {
return true; //return rangeAdded(edit);
}
public boolean visit(InsertEdit edit) {
return rangeAdded(edit);
}
public boolean visit(ReplaceEdit edit) {
if (edit.getLength() > 0)
return rangeAdded(edit);
return rangeRemoved(edit);
}
public boolean visit(MoveSourceEdit edit) {
return rangeRemoved(edit);
}
public boolean visit(DeleteEdit edit) {
return rangeRemoved(edit);
}
private boolean rangeRemoved(TextEdit edit) {
unchangedUntil(edit.getOffset());
return false;
}
private boolean rangeAdded(TextEdit edit) {
unchangedUntil(edit.getOffset());
buf.append("<b>"); //$NON-NLS-1$
appendContent(previewContent, edit.getOffset(), edit.getExclusiveEnd(), buf, false);
buf.append("</b>"); //$NON-NLS-1$
fWrittenToPos = edit.getExclusiveEnd();
return false;
}
}
EditAnnotator ea = new EditAnnotator();
rootEdit.accept(ea);
// Final pre-existing region
ea.unchangedUntil(previewContent.getLength());
} catch (CoreException e) {
JavaPlugin.log(e);
}
return buf.toString();
}
private final int surroundLines= 1;
private void appendContent(IDocument text, int startOffset, int endOffset, StringBuffer buf, boolean surroundLinesOnly) {
try {
int startLine= text.getLineOfOffset(startOffset);
int endLine= text.getLineOfOffset(endOffset);
boolean dotsAdded= false;
if (surroundLinesOnly && startOffset == 0) { // no surround lines for the top no-change range
startLine= Math.max(endLine - surroundLines, 0);
buf.append("...<br>"); //$NON-NLS-1$
dotsAdded= true;
}
for (int i= startLine; i <= endLine; i++) {
if (surroundLinesOnly) {
if ((i - startLine > surroundLines) && (endLine - i > surroundLines)) {
if (!dotsAdded) {
buf.append("...<br>"); //$NON-NLS-1$
dotsAdded= true;
} else if (endOffset == text.getLength()) {
return; // no surround lines for the bottom no-change range
}
continue;
}
}
IRegion lineInfo= text.getLineInformation(i);
int start= lineInfo.getOffset();
int end= start + lineInfo.getLength();
int from= Math.max(start, startOffset);
int to= Math.min(end, endOffset);
String content= text.get(from, to - from);
if (surroundLinesOnly && (from == start) && Strings.containsOnlyWhitespaces(content)) {
continue; // ignore empty lines except when range started in the middle of a line
}
for (int k= 0; k < content.length(); k++) {
char ch= content.charAt(k);
if (ch == '<') {
buf.append("<"); //$NON-NLS-1$
} else if (ch == '>') {
buf.append(">"); //$NON-NLS-1$
} else {
buf.append(ch);
}
}
if (to == end && to != endOffset) { // new line when at the end of the line, and not end of range
buf.append("<br>"); //$NON-NLS-1$
}
}
} catch (BadLocationException e) {
// ignore
}
}
/* (non-Javadoc)
* @see org.eclipse.jface.text.contentassist.ICompletionProposal#apply(org.eclipse.jface.text.IDocument)
*/
public void apply(IDocument document) {
try {
ICompilationUnit unit= getCompilationUnit();
IEditorPart part= null;
if (unit.getResource().exists()) {
boolean canEdit= performValidateEdit(unit);
if (!canEdit) {
return;
}
part= EditorUtility.isOpenInEditor(unit);
if (part == null) {
part= JavaUI.openInEditor(unit);
if (part != null) {
document= JavaUI.getDocumentProvider().getDocument(part.getEditorInput());
}
}
IWorkbenchPage page= JavaPlugin.getActivePage();
if (page != null && part != null) {
page.bringToTop(part);
}
if (part != null) {
part.setFocus();
}
}
performChange(part, document);
} catch (CoreException e) {
ExceptionHandler.handle(e, CorrectionMessages.CUCorrectionProposal_error_title, CorrectionMessages.CUCorrectionProposal_error_message);
}
}
private boolean performValidateEdit(ICompilationUnit unit) {
IStatus status= Resources.makeCommittable(unit.getResource(), JavaPlugin.getActiveWorkbenchShell());
if (!status.isOK()) {
String label= CorrectionMessages.CUCorrectionProposal_error_title;
String message= CorrectionMessages.CUCorrectionProposal_error_message;
ErrorDialog.openError(JavaPlugin.getActiveWorkbenchShell(), label, message, status);
return false;
}
return true;
}
/* (non-Javadoc)
* @see org.eclipse.jdt.internal.ui.text.correction.ChangeCorrectionProposal#performChange(org.eclipse.jface.text.IDocument, org.eclipse.ui.IEditorPart)
*/
protected void performChange(IEditorPart part, IDocument document) throws CoreException {
try {
super.performChange(part, document);
if (part == null) {
return;
}
if (fLinkedProposalModel != null) {
if (fLinkedProposalModel.hasLinkedPositions() && part instanceof JavaEditor) {
// enter linked mode
ITextViewer viewer= ((JavaEditor) part).getViewer();
new LinkedProposalModelPresenter().enterLinkedMode(viewer, part, fLinkedProposalModel);
} else if (part instanceof ITextEditor) {
LinkedProposalPositionGroup.PositionInformation endPosition= fLinkedProposalModel.getEndPosition();
if (endPosition != null) {
// select a result
int pos= endPosition.getOffset() + endPosition.getLength();
((ITextEditor) part).selectAndReveal(pos, 0);
}
}
}
} catch (BadLocationException e) {
throw new CoreException(JavaUIStatus.createError(IStatus.ERROR, e));
}
}
/**
* Creates the text change for this proposal.
* This method is only called once and only when no text change has been passed in
* {@link #CUCorrectionProposal(String, ICompilationUnit, TextChange, int, Image)}.
*
* @return returns the created text change.
* @throws CoreException thrown if the creation of the text change failed.
*/
protected TextChange createTextChange() throws CoreException {
ICompilationUnit cu= getCompilationUnit();
String name= getName();
TextChange change;
if (!cu.getResource().exists()) {
String source;
try {
source= cu.getSource();
} catch (JavaModelException e) {
JavaPlugin.log(e);
source= new String(); // empty
}
Document document= new Document(source);
document.setInitialLineDelimiter(StubUtility.getLineDelimiterUsed(cu));
change= new DocumentChange(name, document);
} else {
CompilationUnitChange cuChange = new CompilationUnitChange(name, cu);
cuChange.setSaveMode(TextFileChange.LEAVE_DIRTY);
change= cuChange;
}
TextEdit rootEdit= new MultiTextEdit();
change.setEdit(rootEdit);
// initialize text change
IDocument document= change.getCurrentDocument(new NullProgressMonitor());
addEdits(document, rootEdit);
return change;
}
/* (non-Javadoc)
* @see org.eclipse.jdt.internal.ui.text.correction.ChangeCorrectionProposal#createChange()
*/
protected final Change createChange() throws CoreException {
return createTextChange(); // make sure that only text changes are allowed here
}
/**
* Gets the text change that is invoked when the change is applied.
*
* @return returns the text change that is invoked when the change is applied.
* @throws CoreException throws an exception if accessing the change failed
*/
public final TextChange getTextChange() throws CoreException {
return (TextChange) getChange();
}
/**
* The compilation unit on that the change works.
*
* @return the compilation unit on that the change works.
*/
public final ICompilationUnit getCompilationUnit() {
return fCompilationUnit;
}
/**
* Creates a preview of the content of the compilation unit after applying the change.
*
* @return returns the preview of the changed compilation unit.
* @throws CoreException thrown if the creation of the change failed.
*/
public String getPreviewContent() throws CoreException {
return getTextChange().getPreviewContent(new NullProgressMonitor());
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
public String toString() {
try {
return getPreviewContent();
} catch (CoreException e) {
}
return super.toString();
}
}