/*******************************************************************************
* Copyright (c) 2000, 2010 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
* Genady Beryozkin <eclipse@genady.org> - [hovering] tooltip for constant string does not show constant value - https://bugs.eclipse.org/bugs/show_bug.cgi?id=85382
*******************************************************************************/
package org.eclipse.jdt.internal.ui.text.java.hover;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringReader;
import java.net.URISyntaxException;
import java.net.URL;
import org.osgi.framework.Bundle;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.ToolBarManager;
import org.eclipse.jface.internal.text.html.BrowserInformationControl;
import org.eclipse.jface.internal.text.html.BrowserInformationControlInput;
import org.eclipse.jface.internal.text.html.BrowserInput;
import org.eclipse.jface.internal.text.html.HTMLPrinter;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.text.AbstractReusableInformationControlCreator;
import org.eclipse.jface.text.DefaultInformationControl;
import org.eclipse.jface.text.IInformationControl;
import org.eclipse.jface.text.IInformationControlCreator;
import org.eclipse.jface.text.IInformationControlExtension4;
import org.eclipse.jface.text.IInputChangedListener;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.ISharedImages;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchSite;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.editors.text.EditorsUI;
import org.eclipse.jdt.core.IAnnotatable;
import org.eclipse.jdt.core.IField;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IMember;
import org.eclipse.jdt.core.IOpenable;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.ITypeRoot;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.ASTParser;
import org.eclipse.jdt.core.dom.CharacterLiteral;
import org.eclipse.jdt.core.dom.ClassInstanceCreation;
import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jdt.core.dom.ConstructorInvocation;
import org.eclipse.jdt.core.dom.IAnnotationBinding;
import org.eclipse.jdt.core.dom.IBinding;
import org.eclipse.jdt.core.dom.IMemberValuePairBinding;
import org.eclipse.jdt.core.dom.IMethodBinding;
import org.eclipse.jdt.core.dom.ITypeBinding;
import org.eclipse.jdt.core.dom.IVariableBinding;
import org.eclipse.jdt.core.dom.NodeFinder;
import org.eclipse.jdt.core.dom.ParameterizedType;
import org.eclipse.jdt.core.dom.QualifiedName;
import org.eclipse.jdt.core.dom.QualifiedType;
import org.eclipse.jdt.core.dom.SimpleName;
import org.eclipse.jdt.core.dom.SimpleType;
import org.eclipse.jdt.core.dom.StringLiteral;
import org.eclipse.jdt.core.dom.StructuralPropertyDescriptor;
import org.eclipse.jdt.core.dom.SuperConstructorInvocation;
import org.eclipse.jdt.core.formatter.DefaultCodeFormatterConstants;
import org.eclipse.jdt.internal.corext.javadoc.JavaDocLocations;
import org.eclipse.jdt.internal.corext.util.JdtFlags;
import org.eclipse.jdt.internal.corext.util.Messages;
import org.eclipse.jdt.ui.JavaElementLabels;
import org.eclipse.jdt.ui.JavaUI;
import org.eclipse.jdt.ui.PreferenceConstants;
import org.eclipse.jdt.ui.SharedASTProvider;
import org.eclipse.jdt.ui.actions.OpenAttachedJavadocAction;
import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.internal.ui.JavaPluginImages;
import org.eclipse.jdt.internal.ui.actions.OpenBrowserUtil;
import org.eclipse.jdt.internal.ui.actions.SimpleSelectionProvider;
import org.eclipse.jdt.internal.ui.infoviews.JavadocView;
import org.eclipse.jdt.internal.ui.text.javadoc.JavadocContentAccess2;
import org.eclipse.jdt.internal.ui.viewsupport.BasicElementLabels;
import org.eclipse.jdt.internal.ui.viewsupport.JavaElementLinks;
/**
* Provides Javadoc as hover info for Java elements.
*
* @since 2.1
*/
public class JavadocHover extends AbstractJavaEditorTextHover {
/**
* Action to go back to the previous input in the hover control.
*
* @since 3.4
*/
private static final class BackAction extends Action {
private final BrowserInformationControl fInfoControl;
public BackAction(BrowserInformationControl infoControl) {
fInfoControl= infoControl;
setText(JavaHoverMessages.JavadocHover_back);
ISharedImages images= PlatformUI.getWorkbench().getSharedImages();
setImageDescriptor(images.getImageDescriptor(ISharedImages.IMG_TOOL_BACK));
setDisabledImageDescriptor(images.getImageDescriptor(ISharedImages.IMG_TOOL_BACK_DISABLED));
update();
}
public void run() {
BrowserInformationControlInput previous= (BrowserInformationControlInput) fInfoControl.getInput().getPrevious();
if (previous != null) {
fInfoControl.setInput(previous);
}
}
public void update() {
BrowserInformationControlInput current= fInfoControl.getInput();
if (current != null && current.getPrevious() != null) {
BrowserInput previous= current.getPrevious();
setToolTipText(Messages.format(JavaHoverMessages.JavadocHover_back_toElement_toolTip, BasicElementLabels.getJavaElementName(previous.getInputName())));
setEnabled(true);
} else {
setToolTipText(JavaHoverMessages.JavadocHover_back);
setEnabled(false);
}
}
}
/**
* Action to go forward to the next input in the hover control.
*
* @since 3.4
*/
private static final class ForwardAction extends Action {
private final BrowserInformationControl fInfoControl;
public ForwardAction(BrowserInformationControl infoControl) {
fInfoControl= infoControl;
setText(JavaHoverMessages.JavadocHover_forward);
ISharedImages images= PlatformUI.getWorkbench().getSharedImages();
setImageDescriptor(images.getImageDescriptor(ISharedImages.IMG_TOOL_FORWARD));
setDisabledImageDescriptor(images.getImageDescriptor(ISharedImages.IMG_TOOL_FORWARD_DISABLED));
update();
}
public void run() {
BrowserInformationControlInput next= (BrowserInformationControlInput) fInfoControl.getInput().getNext();
if (next != null) {
fInfoControl.setInput(next);
}
}
public void update() {
BrowserInformationControlInput current= fInfoControl.getInput();
if (current != null && current.getNext() != null) {
setToolTipText(Messages.format(JavaHoverMessages.JavadocHover_forward_toElement_toolTip, BasicElementLabels.getJavaElementName(current.getNext().getInputName())));
setEnabled(true);
} else {
setToolTipText(JavaHoverMessages.JavadocHover_forward_toolTip);
setEnabled(false);
}
}
}
/**
* Action that shows the current hover contents in the Javadoc view.
*
* @since 3.4
*/
private static final class ShowInJavadocViewAction extends Action {
private final BrowserInformationControl fInfoControl;
public ShowInJavadocViewAction(BrowserInformationControl infoControl) {
fInfoControl= infoControl;
setText(JavaHoverMessages.JavadocHover_showInJavadoc);
setImageDescriptor(JavaPluginImages.DESC_OBJS_JAVADOCTAG); //TODO: better image
}
/*
* @see org.eclipse.jface.action.Action#run()
*/
public void run() {
JavadocBrowserInformationControlInput infoInput= (JavadocBrowserInformationControlInput) fInfoControl.getInput(); //TODO: check cast
fInfoControl.notifyDelayedInputChange(null);
fInfoControl.dispose(); //FIXME: should have protocol to hide, rather than dispose
try {
JavadocView view= (JavadocView) JavaPlugin.getActivePage().showView(JavaUI.ID_JAVADOC_VIEW);
view.setInput(infoInput);
} catch (PartInitException e) {
JavaPlugin.log(e);
}
}
}
/**
* Action that opens the current hover input element.
*
* @since 3.4
*/
private static final class OpenDeclarationAction extends Action {
private final BrowserInformationControl fInfoControl;
public OpenDeclarationAction(BrowserInformationControl infoControl) {
fInfoControl= infoControl;
setText(JavaHoverMessages.JavadocHover_openDeclaration);
JavaPluginImages.setLocalImageDescriptors(this, "goto_input.gif"); //$NON-NLS-1$ //TODO: better images
}
/*
* @see org.eclipse.jface.action.Action#run()
*/
public void run() {
JavadocBrowserInformationControlInput infoInput= (JavadocBrowserInformationControlInput) fInfoControl.getInput(); //TODO: check cast
fInfoControl.notifyDelayedInputChange(null);
fInfoControl.dispose(); //FIXME: should have protocol to hide, rather than dispose
try {
//FIXME: add hover location to editor navigation history?
JavaUI.openInEditor(infoInput.getElement());
} catch (PartInitException e) {
JavaPlugin.log(e);
} catch (JavaModelException e) {
JavaPlugin.log(e);
}
}
}
/**
* Presenter control creator.
*
* @since 3.3
*/
public static final class PresenterControlCreator extends AbstractReusableInformationControlCreator {
private IWorkbenchSite fSite;
/**
* Creates a new PresenterControlCreator.
*
* @param site the site or <code>null</code> if none
* @since 3.6
*/
public PresenterControlCreator(IWorkbenchSite site) {
fSite= site;
}
/*
* @see org.eclipse.jdt.internal.ui.text.java.hover.AbstractReusableInformationControlCreator#doCreateInformationControl(org.eclipse.swt.widgets.Shell)
*/
public IInformationControl doCreateInformationControl(Shell parent) {
if (BrowserInformationControl.isAvailable(parent)) {
ToolBarManager tbm= new ToolBarManager(SWT.FLAT);
String font= PreferenceConstants.APPEARANCE_JAVADOC_FONT;
BrowserInformationControl iControl= new BrowserInformationControl(parent, font, tbm);
final BackAction backAction= new BackAction(iControl);
backAction.setEnabled(false);
tbm.add(backAction);
final ForwardAction forwardAction= new ForwardAction(iControl);
tbm.add(forwardAction);
forwardAction.setEnabled(false);
final ShowInJavadocViewAction showInJavadocViewAction= new ShowInJavadocViewAction(iControl);
tbm.add(showInJavadocViewAction);
final OpenDeclarationAction openDeclarationAction= new OpenDeclarationAction(iControl);
tbm.add(openDeclarationAction);
final SimpleSelectionProvider selectionProvider= new SimpleSelectionProvider();
if (fSite != null) {
OpenAttachedJavadocAction openAttachedJavadocAction= new OpenAttachedJavadocAction(fSite);
openAttachedJavadocAction.setSpecialSelectionProvider(selectionProvider);
openAttachedJavadocAction.setImageDescriptor(JavaPluginImages.DESC_ELCL_OPEN_BROWSER);
openAttachedJavadocAction.setDisabledImageDescriptor(JavaPluginImages.DESC_DLCL_OPEN_BROWSER);
selectionProvider.addSelectionChangedListener(openAttachedJavadocAction);
selectionProvider.setSelection(new StructuredSelection());
tbm.add(openAttachedJavadocAction);
}
IInputChangedListener inputChangeListener= new IInputChangedListener() {
public void inputChanged(Object newInput) {
backAction.update();
forwardAction.update();
if (newInput == null) {
selectionProvider.setSelection(new StructuredSelection());
} else if (newInput instanceof BrowserInformationControlInput) {
BrowserInformationControlInput input= (BrowserInformationControlInput) newInput;
Object inputElement= input.getInputElement();
selectionProvider.setSelection(new StructuredSelection(inputElement));
boolean isJavaElementInput= inputElement instanceof IJavaElement;
showInJavadocViewAction.setEnabled(isJavaElementInput);
openDeclarationAction.setEnabled(isJavaElementInput);
}
}
};
iControl.addInputChangeListener(inputChangeListener);
tbm.update(true);
addLinkListener(iControl);
return iControl;
} else {
return new DefaultInformationControl(parent, true);
}
}
}
/**
* Hover control creator.
*
* @since 3.3
*/
public static final class HoverControlCreator extends AbstractReusableInformationControlCreator {
/**
* The information presenter control creator.
* @since 3.4
*/
private final IInformationControlCreator fInformationPresenterControlCreator;
/**
* <code>true</code> to use the additional info affordance, <code>false</code> to use the hover affordance.
*/
private final boolean fAdditionalInfoAffordance;
/**
* @param informationPresenterControlCreator control creator for enriched hover
* @since 3.4
*/
public HoverControlCreator(IInformationControlCreator informationPresenterControlCreator) {
this(informationPresenterControlCreator, false);
}
/**
* @param informationPresenterControlCreator control creator for enriched hover
* @param additionalInfoAffordance <code>true</code> to use the additional info affordance, <code>false</code> to use the hover affordance
* @since 3.4
*/
public HoverControlCreator(IInformationControlCreator informationPresenterControlCreator, boolean additionalInfoAffordance) {
fInformationPresenterControlCreator= informationPresenterControlCreator;
fAdditionalInfoAffordance= additionalInfoAffordance;
}
/*
* @see org.eclipse.jdt.internal.ui.text.java.hover.AbstractReusableInformationControlCreator#doCreateInformationControl(org.eclipse.swt.widgets.Shell)
*/
public IInformationControl doCreateInformationControl(Shell parent) {
String tooltipAffordanceString= fAdditionalInfoAffordance ? JavaPlugin.getAdditionalInfoAffordanceString() : EditorsUI.getTooltipAffordanceString();
if (BrowserInformationControl.isAvailable(parent)) {
String font= PreferenceConstants.APPEARANCE_JAVADOC_FONT;
BrowserInformationControl iControl= new BrowserInformationControl(parent, font, tooltipAffordanceString) {
/*
* @see org.eclipse.jface.text.IInformationControlExtension5#getInformationPresenterControlCreator()
*/
public IInformationControlCreator getInformationPresenterControlCreator() {
return fInformationPresenterControlCreator;
}
};
addLinkListener(iControl);
return iControl;
} else {
return new DefaultInformationControl(parent, tooltipAffordanceString);
}
}
/*
* @see org.eclipse.jdt.internal.ui.text.java.hover.AbstractReusableInformationControlCreator#canReuse(org.eclipse.jface.text.IInformationControl)
*/
public boolean canReuse(IInformationControl control) {
if (!super.canReuse(control))
return false;
if (control instanceof IInformationControlExtension4) {
String tooltipAffordanceString= fAdditionalInfoAffordance ? JavaPlugin.getAdditionalInfoAffordanceString() : EditorsUI.getTooltipAffordanceString();
((IInformationControlExtension4)control).setStatusText(tooltipAffordanceString);
}
return true;
}
}
private static final long LABEL_FLAGS= JavaElementLabels.ALL_FULLY_QUALIFIED
| JavaElementLabels.M_PRE_RETURNTYPE | JavaElementLabels.M_PARAMETER_TYPES | JavaElementLabels.M_PARAMETER_NAMES | JavaElementLabels.M_EXCEPTIONS
| JavaElementLabels.F_PRE_TYPE_SIGNATURE | JavaElementLabels.M_PRE_TYPE_PARAMETERS | JavaElementLabels.T_TYPE_PARAMETERS
| JavaElementLabels.USE_RESOLVED;
private static final long LOCAL_VARIABLE_FLAGS= LABEL_FLAGS & ~JavaElementLabels.F_FULLY_QUALIFIED | JavaElementLabels.F_POST_QUALIFIED;
private static final long TYPE_PARAMETER_FLAGS= LABEL_FLAGS | JavaElementLabels.TP_POST_QUALIFIED;
/**
* The style sheet (css).
* @since 3.4
*/
private static String fgStyleSheet;
/**
* The hover control creator.
*
* @since 3.2
*/
private IInformationControlCreator fHoverControlCreator;
/**
* The presentation control creator.
*
* @since 3.2
*/
private IInformationControlCreator fPresenterControlCreator;
/*
* @see org.eclipse.jface.text.ITextHoverExtension2#getInformationPresenterControlCreator()
* @since 3.1
*/
public IInformationControlCreator getInformationPresenterControlCreator() {
if (fPresenterControlCreator == null)
fPresenterControlCreator= new PresenterControlCreator(getSite());
return fPresenterControlCreator;
}
private IWorkbenchSite getSite() {
IEditorPart editor= getEditor();
if (editor == null) {
IWorkbenchPage page= JavaPlugin.getActivePage();
if (page != null)
editor= page.getActiveEditor();
}
if (editor != null)
return editor.getSite();
return null;
}
/*
* @see ITextHoverExtension#getHoverControlCreator()
* @since 3.2
*/
public IInformationControlCreator getHoverControlCreator() {
if (fHoverControlCreator == null)
fHoverControlCreator= new HoverControlCreator(getInformationPresenterControlCreator());
return fHoverControlCreator;
}
private static void addLinkListener(final BrowserInformationControl control) {
control.addLocationListener(JavaElementLinks.createLocationListener(new JavaElementLinks.ILinkHandler() {
/* (non-Javadoc)
* @see org.eclipse.jdt.internal.ui.viewsupport.JavaElementLinks.ILinkHandler#handleJavadocViewLink(org.eclipse.jdt.core.IJavaElement)
*/
public void handleJavadocViewLink(IJavaElement linkTarget) {
control.notifyDelayedInputChange(null);
control.setVisible(false);
control.dispose(); //FIXME: should have protocol to hide, rather than dispose
try {
JavadocView view= (JavadocView) JavaPlugin.getActivePage().showView(JavaUI.ID_JAVADOC_VIEW);
view.setInput(linkTarget);
} catch (PartInitException e) {
JavaPlugin.log(e);
}
}
/* (non-Javadoc)
* @see org.eclipse.jdt.internal.ui.viewsupport.JavaElementLinks.ILinkHandler#handleInlineJavadocLink(org.eclipse.jdt.core.IJavaElement)
*/
public void handleInlineJavadocLink(IJavaElement linkTarget) {
JavadocBrowserInformationControlInput hoverInfo= getHoverInfo(new IJavaElement[] { linkTarget }, null, null, (JavadocBrowserInformationControlInput) control.getInput());
if (control.hasDelayedInputChangeListener())
control.notifyDelayedInputChange(hoverInfo);
else
control.setInput(hoverInfo);
}
/* (non-Javadoc)
* @see org.eclipse.jdt.internal.ui.viewsupport.JavaElementLinks.ILinkHandler#handleDeclarationLink(org.eclipse.jdt.core.IJavaElement)
*/
public void handleDeclarationLink(IJavaElement linkTarget) {
control.notifyDelayedInputChange(null);
control.dispose(); //FIXME: should have protocol to hide, rather than dispose
try {
//FIXME: add hover location to editor navigation history?
JavaUI.openInEditor(linkTarget);
} catch (PartInitException e) {
JavaPlugin.log(e);
} catch (JavaModelException e) {
JavaPlugin.log(e);
}
}
/* (non-Javadoc)
* @see org.eclipse.jdt.internal.ui.viewsupport.JavaElementLinks.ILinkHandler#handleExternalLink(java.net.URL, org.eclipse.swt.widgets.Display)
*/
public boolean handleExternalLink(URL url, Display display) {
control.notifyDelayedInputChange(null);
control.dispose(); //FIXME: should have protocol to hide, rather than dispose
// Open attached Javadoc links
OpenBrowserUtil.open(url, display);
return true;
}
public void handleTextSet() {
}
}));
}
/**
* @deprecated see {@link org.eclipse.jface.text.ITextHover#getHoverInfo(ITextViewer, IRegion)}
*/
public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
JavadocBrowserInformationControlInput info= (JavadocBrowserInformationControlInput) getHoverInfo2(textViewer, hoverRegion);
return info != null ? info.getHtml() : null;
}
/*
* @see org.eclipse.jface.text.ITextHoverExtension2#getHoverInfo2(org.eclipse.jface.text.ITextViewer, org.eclipse.jface.text.IRegion)
*/
public Object getHoverInfo2(ITextViewer textViewer, IRegion hoverRegion) {
return internalGetHoverInfo(textViewer, hoverRegion);
}
private JavadocBrowserInformationControlInput internalGetHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
IJavaElement[] elements= getJavaElementsAt(textViewer, hoverRegion);
if (elements == null || elements.length == 0)
return null;
return getHoverInfo(elements, getEditorInputJavaElement(), hoverRegion, null);
}
/**
* Computes the hover info.
*
* @param elements the resolved elements
* @param editorInputElement the editor input, or <code>null</code>
* @param hoverRegion the text range of the hovered word, or <code>null</code>
* @param previousInput the previous input, or <code>null</code>
* @return the HTML hover info for the given element(s) or <code>null</code> if no information is available
* @since 3.4
*/
private static JavadocBrowserInformationControlInput getHoverInfo(IJavaElement[] elements, ITypeRoot editorInputElement, IRegion hoverRegion, JavadocBrowserInformationControlInput previousInput) {
int nResults= elements.length;
StringBuffer buffer= new StringBuffer();
boolean hasContents= false;
String base= null;
IJavaElement element= null;
int leadingImageWidth= 0;
if (nResults > 1) {
for (int i= 0; i < elements.length; i++) {
HTMLPrinter.startBulletList(buffer);
IJavaElement curr= elements[i];
if (curr instanceof IMember || curr.getElementType() == IJavaElement.LOCAL_VARIABLE) {
String label= JavaElementLabels.getElementLabel(curr, getHeaderFlags(curr));
String link;
try {
String uri= JavaElementLinks.createURI(JavaElementLinks.JAVADOC_SCHEME, curr);
link= JavaElementLinks.createLink(uri, label);
} catch (URISyntaxException e) {
JavaPlugin.log(e);
link= label;
}
HTMLPrinter.addBullet(buffer, link);
hasContents= true;
}
HTMLPrinter.endBulletList(buffer);
}
} else {
element= elements[0];
if (element instanceof IMember) {
HTMLPrinter.addSmallHeader(buffer, getInfoText(element, editorInputElement, hoverRegion, true));
buffer.append("<br>"); //$NON-NLS-1$
addAnnotations(buffer, element, editorInputElement, hoverRegion);
IMember member= (IMember) element;
Reader reader;
try {
// reader= JavadocContentAccess.getHTMLContentReader(member, true, true);
String content= JavadocContentAccess2.getHTMLContent(member, true);
reader= content == null ? null : new StringReader(content);
// Provide hint why there's no Javadoc
if (reader == null && member.isBinary()) {
boolean hasAttachedJavadoc= JavaDocLocations.getJavadocBaseLocation(member) != null;
IPackageFragmentRoot root= (IPackageFragmentRoot)member.getAncestor(IJavaElement.PACKAGE_FRAGMENT_ROOT);
boolean hasAttachedSource= root != null && root.getSourceAttachmentPath() != null;
IOpenable openable= member.getOpenable();
boolean hasSource= openable.getBuffer() != null;
if (!hasAttachedSource && !hasAttachedJavadoc)
reader= new StringReader(JavaHoverMessages.JavadocHover_noAttachments);
else if (!hasAttachedJavadoc && !hasSource)
reader= new StringReader(JavaHoverMessages.JavadocHover_noAttachedJavadoc);
else if (!hasAttachedSource)
reader= new StringReader(JavaHoverMessages.JavadocHover_noAttachedSource);
else if (!hasSource)
reader= new StringReader(JavaHoverMessages.JavadocHover_noInformation);
} else {
base= JavaDocLocations.getBaseURL(member);
}
} catch (JavaModelException ex) {
reader= new StringReader(JavaHoverMessages.JavadocHover_error_gettingJavadoc);
JavaPlugin.log(ex);
}
if (reader != null) {
HTMLPrinter.addParagraph(buffer, reader);
}
hasContents= true;
} else if (element.getElementType() == IJavaElement.LOCAL_VARIABLE || element.getElementType() == IJavaElement.TYPE_PARAMETER) {
addAnnotations(buffer, element, editorInputElement, hoverRegion);
HTMLPrinter.addSmallHeader(buffer, getInfoText(element, editorInputElement, hoverRegion, true));
hasContents= true;
}
leadingImageWidth= 20;
}
if (!hasContents)
return null;
if (buffer.length() > 0) {
HTMLPrinter.insertPageProlog(buffer, 0, JavadocHover.getStyleSheet());
if (base != null) {
int endHeadIdx= buffer.indexOf("</head>"); //$NON-NLS-1$
buffer.insert(endHeadIdx, "\n<base href='" + base + "'>\n"); //$NON-NLS-1$ //$NON-NLS-2$
}
HTMLPrinter.addPageEpilog(buffer);
return new JavadocBrowserInformationControlInput(previousInput, element, buffer.toString(), leadingImageWidth);
}
return null;
}
private static String getInfoText(IJavaElement element, ITypeRoot editorInputElement, IRegion hoverRegion, boolean allowImage) {
long flags= getHeaderFlags(element);
StringBuffer label= new StringBuffer(JavaElementLinks.getElementLabel(element, flags));
if (element.getElementType() == IJavaElement.FIELD) {
String constantValue= getConstantValue((IField) element, editorInputElement, hoverRegion);
if (constantValue != null) {
constantValue= HTMLPrinter.convertToHTMLContent(constantValue);
IJavaProject javaProject= element.getJavaProject();
if (JavaCore.INSERT.equals(javaProject.getOption(DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_ASSIGNMENT_OPERATOR, true)))
label.append(' ');
label.append('=');
if (JavaCore.INSERT.equals(javaProject.getOption(DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_AFTER_ASSIGNMENT_OPERATOR, true)))
label.append(' ');
label.append(constantValue);
}
}
// if (element.getElementType() == IJavaElement.METHOD) {
// IMethod method= (IMethod)element;
// //TODO: add default value for annotation type members, see https://bugs.eclipse.org/bugs/show_bug.cgi?id=249016
// }
String imageName= null;
if (allowImage) {
URL imageUrl= JavaPlugin.getDefault().getImagesOnFSRegistry().getImageURL(element);
if (imageUrl != null) {
imageName= imageUrl.toExternalForm();
}
}
StringBuffer buf= new StringBuffer();
addImageAndLabel(buf, element, imageName, 16, 16, label.toString(), 20, 2);
return buf.toString();
}
private static long getHeaderFlags(IJavaElement element) {
switch (element.getElementType()) {
case IJavaElement.LOCAL_VARIABLE:
return LOCAL_VARIABLE_FLAGS;
case IJavaElement.TYPE_PARAMETER:
return TYPE_PARAMETER_FLAGS;
default:
return LABEL_FLAGS;
}
}
/*
* @since 3.4
*/
private static boolean isStaticFinal(IField field) {
try {
return JdtFlags.isFinal(field) && JdtFlags.isStatic(field);
} catch (JavaModelException e) {
JavaPlugin.log(e);
return false;
}
}
/**
* Returns the constant value for the given field.
*
* @param field the field
* @param editorInputElement the editor input element
* @param hoverRegion the hover region in the editor
* @return the constant value for the given field or <code>null</code> if none
* @since 3.4
*/
private static String getConstantValue(IField field, ITypeRoot editorInputElement, IRegion hoverRegion) {
if (!isStaticFinal(field))
return null;
ASTNode node= getHoveredASTNode(editorInputElement, hoverRegion);
if (node == null)
return null;
Object constantValue= null;
if (node.getNodeType() == ASTNode.SIMPLE_NAME) {
IBinding binding= ((SimpleName)node).resolveBinding();
if (binding != null && binding.getKind() == IBinding.VARIABLE) {
IVariableBinding variableBinding= (IVariableBinding)binding;
if (field.equals(variableBinding.getJavaElement())) {
constantValue= variableBinding.getConstantValue();
}
}
}
if (constantValue == null)
return null;
if (constantValue instanceof String) {
return getEscapedStringLiteral((String) constantValue);
} else if (constantValue instanceof Character) {
String constantResult= getEscapedCharacterLiteral(((Character) constantValue).charValue());
char charValue= ((Character) constantValue).charValue();
String hexString= Integer.toHexString(charValue);
StringBuffer hexResult= new StringBuffer("\\u"); //$NON-NLS-1$
for (int i= hexString.length(); i < 4; i++) {
hexResult.append('0');
}
hexResult.append(hexString);
return formatWithHexValue(constantResult, hexResult.toString());
} else if (constantValue instanceof Byte) {
int byteValue= ((Byte) constantValue).intValue() & 0xFF;
return formatWithHexValue(constantValue, "0x" + Integer.toHexString(byteValue)); //$NON-NLS-1$
} else if (constantValue instanceof Short) {
int shortValue= ((Short) constantValue).shortValue() & 0xFFFF;
return formatWithHexValue(constantValue, "0x" + Integer.toHexString(shortValue)); //$NON-NLS-1$
} else if (constantValue instanceof Integer) {
int intValue= ((Integer) constantValue).intValue();
return formatWithHexValue(constantValue, "0x" + Integer.toHexString(intValue)); //$NON-NLS-1$
} else if (constantValue instanceof Long) {
long longValue= ((Long) constantValue).longValue();
return formatWithHexValue(constantValue, "0x" + Long.toHexString(longValue)); //$NON-NLS-1$
} else {
return constantValue.toString();
}
}
private static ASTNode getHoveredASTNode(ITypeRoot editorInputElement, IRegion hoverRegion) {
if (editorInputElement == null)
return null;
CompilationUnit unit= SharedASTProvider.getAST(editorInputElement, SharedASTProvider.WAIT_ACTIVE_ONLY, null);
if (unit == null)
return null;
return NodeFinder.perform(unit, hoverRegion.getOffset(), hoverRegion.getLength());
}
private static String getEscapedStringLiteral(String stringValue) {
StringLiteral stringLiteral= AST.newAST(AST.JLS3).newStringLiteral();
stringLiteral.setLiteralValue(stringValue);
String stringConstant= stringLiteral.getEscapedValue();
if (stringConstant.length() > 80) {
return stringConstant.substring(0, 80) + JavaElementLabels.ELLIPSIS_STRING;
} else {
return stringConstant;
}
}
private static String getEscapedCharacterLiteral(char ch) {
CharacterLiteral characterLiteral= AST.newAST(AST.JLS3).newCharacterLiteral();
characterLiteral.setCharValue(ch);
return characterLiteral.getEscapedValue();
}
/**
* Creates and returns a formatted message for the given
* constant with its hex value.
*
* @param constantValue the constant value
* @param hexValue the hex value
* @return a formatted string with constant and hex values
* @since 3.4
*/
private static String formatWithHexValue(Object constantValue, String hexValue) {
return Messages.format(JavaHoverMessages.JavadocHover_constantValue_hexValue, new String[] { constantValue.toString(), hexValue });
}
/**
* Returns the Javadoc hover style sheet with the current Javadoc font from the preferences.
* @return the updated style sheet
* @since 3.4
*/
private static String getStyleSheet() {
if (fgStyleSheet == null)
fgStyleSheet= loadStyleSheet();
String css= fgStyleSheet;
if (css != null) {
FontData fontData= JFaceResources.getFontRegistry().getFontData(PreferenceConstants.APPEARANCE_JAVADOC_FONT)[0];
css= HTMLPrinter.convertTopLevelFont(css, fontData);
}
return css;
}
/**
* Loads and returns the Javadoc hover style sheet.
* @return the style sheet, or <code>null</code> if unable to load
* @since 3.4
*/
private static String loadStyleSheet() {
Bundle bundle= Platform.getBundle(JavaPlugin.getPluginId());
URL styleSheetURL= bundle.getEntry("/JavadocHoverStyleSheet.css"); //$NON-NLS-1$
if (styleSheetURL != null) {
BufferedReader reader= null;
try {
reader= new BufferedReader(new InputStreamReader(styleSheetURL.openStream()));
StringBuffer buffer= new StringBuffer(1500);
String line= reader.readLine();
while (line != null) {
buffer.append(line);
buffer.append('\n');
line= reader.readLine();
}
return buffer.toString();
} catch (IOException ex) {
JavaPlugin.log(ex);
return ""; //$NON-NLS-1$
} finally {
try {
if (reader != null)
reader.close();
} catch (IOException e) {
}
}
}
return null;
}
public static void addImageAndLabel(StringBuffer buf, String imageSrcPath, int imageWidth, int imageHeight, String label, int labelLeft, int labelTop) {
addImageAndLabel(buf, null, imageSrcPath, imageWidth, imageHeight, label, labelLeft, labelTop);
}
public static void addImageAndLabel(StringBuffer buf, IJavaElement element, String imageSrcPath, int imageWidth, int imageHeight, String label, int labelLeft, int labelTop) {
buf.append("<div style='word-wrap: break-word; position: relative; "); //$NON-NLS-1$
if (imageSrcPath != null) {
buf.append("margin-left: ").append(labelLeft).append("px; "); //$NON-NLS-1$ //$NON-NLS-2$
buf.append("padding-top: ").append(labelTop).append("px; "); //$NON-NLS-1$ //$NON-NLS-2$
}
buf.append("'>"); //$NON-NLS-1$
if (imageSrcPath != null) {
if (element != null) {
try {
String uri= JavaElementLinks.createURI(JavaElementLinks.OPEN_LINK_SCHEME, element);
buf.append("<a href='").append(uri).append("'>"); //$NON-NLS-1$//$NON-NLS-2$
} catch (URISyntaxException e) {
element= null; // no link
}
}
StringBuffer imageStyle= new StringBuffer("border:none; position: absolute; "); //$NON-NLS-1$
imageStyle.append("width: ").append(imageWidth).append("px; "); //$NON-NLS-1$ //$NON-NLS-2$
imageStyle.append("height: ").append(imageHeight).append("px; "); //$NON-NLS-1$ //$NON-NLS-2$
imageStyle.append("left: ").append(- labelLeft - 1).append("px; "); //$NON-NLS-1$ //$NON-NLS-2$
// hack for broken transparent PNG support in IE 6, see https://bugs.eclipse.org/bugs/show_bug.cgi?id=223900 :
buf.append("<!--[if lte IE 6]><![if gte IE 5.5]>\n"); //$NON-NLS-1$
String tooltip= JavaHoverMessages.JavadocHover_openDeclaration;
buf.append("<span alt='").append(tooltip).append("' style=\"").append(imageStyle). //$NON-NLS-1$ //$NON-NLS-2$
append("filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='").append(imageSrcPath).append("')\"></span>\n"); //$NON-NLS-1$ //$NON-NLS-2$
buf.append("<![endif]><![endif]-->\n"); //$NON-NLS-1$
buf.append("<!--[if !IE]>-->\n"); //$NON-NLS-1$
buf.append("<img alt='").append(tooltip).append("' style='").append(imageStyle).append("' src='").append(imageSrcPath).append("'/>\n"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
buf.append("<!--<![endif]-->\n"); //$NON-NLS-1$
buf.append("<!--[if gte IE 7]>\n"); //$NON-NLS-1$
buf.append("<img alt='").append(tooltip).append("' style='").append(imageStyle).append("' src='").append(imageSrcPath).append("'/>\n"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
buf.append("<![endif]-->\n"); //$NON-NLS-1$
if (element != null) {
buf.append("</a>"); //$NON-NLS-1$
}
}
buf.append(label);
buf.append("</div>"); //$NON-NLS-1$
}
public static void addAnnotations(StringBuffer buf, IJavaElement element, ITypeRoot editorInputElement, IRegion hoverRegion) {
if (element instanceof IAnnotatable) {
try {
String annotationString= getAnnotations(element, editorInputElement, hoverRegion);
if (annotationString != null) {
buf.append("<div style='margin-bottom: 5px;'>"); //$NON-NLS-1$
buf.append(annotationString);
buf.append("</div>"); //$NON-NLS-1$
}
} catch (JavaModelException e) {
// no annotations this time...
buf.append("<br>"); //$NON-NLS-1$
} catch (URISyntaxException e) {
// no annotations this time...
buf.append("<br>"); //$NON-NLS-1$
}
}
}
private static String getAnnotations(IJavaElement element, ITypeRoot editorInputElement, IRegion hoverRegion) throws URISyntaxException, JavaModelException {
if (!(element instanceof IAnnotatable))
return null;
if (((IAnnotatable)element).getAnnotations().length == 0)
return null;
IBinding binding;
ASTNode node= getHoveredASTNode(editorInputElement, hoverRegion);
if (node == null) {
ASTParser p= ASTParser.newParser(AST.JLS3);
p.setProject(element.getJavaProject());
try {
binding= p.createBindings(new IJavaElement[] { element }, null)[0];
} catch (OperationCanceledException e) {
return null;
}
} else {
binding= resolveBinding(node);
}
if (binding == null)
return null;
IAnnotationBinding[] annotations= binding.getAnnotations();
if (annotations.length == 0)
return null;
StringBuffer buf= new StringBuffer();
for (int i= 0; i < annotations.length; i++) {
//TODO: skip annotations that don't have an @Documented annotation?
addAnnotation(buf, element, annotations[i]);
buf.append("<br>"); //$NON-NLS-1$
}
return buf.toString();
}
private static IBinding resolveBinding(ASTNode node) {
if (node instanceof SimpleName) {
// workaround for https://bugs.eclipse.org/62605 (constructor name resolves to type, not method)
SimpleName simpleName= (SimpleName) node;
StructuralPropertyDescriptor loc= simpleName.getLocationInParent();
while (loc == QualifiedType.NAME_PROPERTY || loc == QualifiedName.NAME_PROPERTY|| loc == SimpleType.NAME_PROPERTY || loc == ParameterizedType.TYPE_PROPERTY) {
node= node.getParent();
loc= node.getLocationInParent();
}
if (loc == ClassInstanceCreation.TYPE_PROPERTY) {
ClassInstanceCreation cic= (ClassInstanceCreation) node.getParent();
IMethodBinding constructorBinding= cic.resolveConstructorBinding();
if (constructorBinding == null)
return null;
ITypeBinding declaringClass= constructorBinding.getDeclaringClass();
if (!declaringClass.isAnonymous())
return constructorBinding;
ITypeBinding superTypeDeclaration= declaringClass.getSuperclass().getTypeDeclaration();
return resolveSuperclassConstructor(superTypeDeclaration, constructorBinding);
}
return simpleName.resolveBinding();
} else if (node instanceof SuperConstructorInvocation) {
return ((SuperConstructorInvocation) node).resolveConstructorBinding();
} else if (node instanceof ConstructorInvocation) {
return ((ConstructorInvocation) node).resolveConstructorBinding();
} else {
return null;
}
}
private static IBinding resolveSuperclassConstructor(ITypeBinding superClassDeclaration, IMethodBinding constructor) {
IMethodBinding[] methods= superClassDeclaration.getDeclaredMethods();
for (int i= 0; i < methods.length; i++) {
IMethodBinding method= methods[i];
if (method.isConstructor() && constructor.isSubsignature(method))
return method;
}
return null;
}
private static void addAnnotation(StringBuffer buf, IJavaElement element, IAnnotationBinding annotation) throws URISyntaxException {
String uri= JavaElementLinks.createURI(JavaElementLinks.JAVADOC_SCHEME, annotation.getAnnotationType().getJavaElement());
buf.append('@');
addLink(buf, uri, annotation.getName());
IMemberValuePairBinding[] mvPairs= annotation.getDeclaredMemberValuePairs();
if (mvPairs.length > 0) {
buf.append('(');
for (int j= 0; j < mvPairs.length; j++) {
if (j > 0) {
buf.append(JavaElementLabels.COMMA_STRING);
}
IMemberValuePairBinding mvPair= mvPairs[j];
String memberURI= JavaElementLinks.createURI(JavaElementLinks.JAVADOC_SCHEME, mvPair.getMethodBinding().getJavaElement());
addLink(buf, memberURI, mvPair.getName());
buf.append('=');
addValue(buf, element, mvPair.getValue());
}
buf.append(')');
}
}
private static void addValue(StringBuffer buf, IJavaElement element, Object value) throws URISyntaxException {
if (value instanceof ITypeBinding) {
ITypeBinding typeBinding= (ITypeBinding)value;
IJavaElement type= typeBinding.getJavaElement();
if (type == null) {
buf.append(typeBinding.getName());
} else {
String uri= JavaElementLinks.createURI(JavaElementLinks.JAVADOC_SCHEME, type);
String name= type.getElementName();
addLink(buf, uri, name);
}
buf.append(".class"); //$NON-NLS-1$
} else if (value instanceof IVariableBinding) { // only enum constants
IVariableBinding variableBinding= (IVariableBinding)value;
IJavaElement variable= variableBinding.getJavaElement();
String uri= JavaElementLinks.createURI(JavaElementLinks.JAVADOC_SCHEME, variable);
String name= variable.getElementName();
addLink(buf, uri, name);
} else if (value instanceof IAnnotationBinding) {
IAnnotationBinding annotationBinding= (IAnnotationBinding)value;
addAnnotation(buf, element, annotationBinding);
} else if (value instanceof String) {
buf.append(getEscapedStringLiteral((String)value));
} else if (value instanceof Character) {
buf.append(getEscapedCharacterLiteral(((Character)value).charValue()));
} else if (value instanceof Object[]) {
Object[] values= (Object[])value;
buf.append('{');
for (int i= 0; i < values.length; i++) {
if (i > 0) {
buf.append(JavaElementLabels.COMMA_STRING);
}
addValue(buf, element, values[i]);
}
buf.append('}');
} else { // primitive types (except char) or null
buf.append(String.valueOf(value));
}
}
private static StringBuffer addLink(StringBuffer buf, String uri, String label) {
return buf.append(JavaElementLinks.createLink(uri, label));
}
}