/*******************************************************************************
* Copyright (c) 2008, 2011 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.viewsupport;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.browser.LocationAdapter;
import org.eclipse.swt.browser.LocationEvent;
import org.eclipse.swt.browser.LocationListener;
import org.eclipse.swt.widgets.Display;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jdt.core.IAnnotation;
import org.eclipse.jdt.core.IField;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.ILocalVariable;
import org.eclipse.jdt.core.IMember;
import org.eclipse.jdt.core.IMethod;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.ITypeHierarchy;
import org.eclipse.jdt.core.ITypeParameter;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.Signature;
import org.eclipse.jdt.internal.corext.util.JavaModelUtil;
import org.eclipse.jdt.internal.corext.util.Strings;
import org.eclipse.jdt.internal.corext.util.SuperTypeHierarchyCache;
import org.eclipse.jdt.ui.JavaElementLabels;
import org.eclipse.jdt.internal.ui.JavaPlugin;
/**
* Links inside Javadoc hovers and Javadoc view.
*
* @since 3.4
*/
public class JavaElementLinks {
/**
* A handler is asked to handle links to targets.
*
* @see JavaElementLinks#createLocationListener(JavaElementLinks.ILinkHandler)
*/
public interface ILinkHandler {
/**
* Handle normal kind of link to given target.
*
* @param target the target to show
*/
void handleInlineJavadocLink(IJavaElement target);
/**
* Handle link to given target to open in javadoc view.
*
* @param target the target to show
*/
void handleJavadocViewLink(IJavaElement target);
/**
* Handle link to given target to open its declaration
*
* @param target the target to show
*/
void handleDeclarationLink(IJavaElement target);
/**
* Handle link to given URL to open in browser.
*
* @param url the url to show
* @param display the current display
* @return <code>true</code> if the handler could open the link <code>false</code> if the
* browser should follow the link
*/
boolean handleExternalLink(URL url, Display display);
/**
* Informs the handler that the text of the browser was set.
*/
void handleTextSet();
}
private static final class JavaElementLinkedLabelComposer extends JavaElementLabelComposer {
private final IJavaElement fElement;
public JavaElementLinkedLabelComposer(IJavaElement member, StringBuffer buf) {
super(buf);
fElement= member;
}
@Override
public String getElementName(IJavaElement element) {
String elementName= element.getElementName();
if (element.equals(fElement)) { // linking to the member itself would be a no-op
return elementName;
}
if (elementName.length() == 0) { // anonymous
return elementName;
}
try {
String uri= createURI(JAVADOC_SCHEME, element);
return createHeaderLink(uri, elementName);
} catch (URISyntaxException e) {
JavaPlugin.log(e);
return elementName;
}
}
@Override
protected String getGT() {
return ">"; //$NON-NLS-1$
}
@Override
protected String getLT() {
return "<"; //$NON-NLS-1$
}
@Override
protected String getSimpleTypeName(IJavaElement enclosingElement, String typeSig) {
String typeName= super.getSimpleTypeName(enclosingElement, typeSig);
try {
String uri= createURI(JAVADOC_SCHEME, enclosingElement, typeName, null, null);
return createHeaderLink(uri, typeName);
} catch (URISyntaxException e) {
JavaPlugin.log(e);
return typeName;
}
}
}
public static final String OPEN_LINK_SCHEME= "eclipse-open"; //$NON-NLS-1$
public static final String JAVADOC_SCHEME= "eclipse-javadoc"; //$NON-NLS-1$
public static final String JAVADOC_VIEW_SCHEME= "eclipse-javadoc-view"; //$NON-NLS-1$
private static final char LINK_BRACKET_REPLACEMENT= '\u2603';
/**
* The link is composed of a number of segments, separated by LINK_SEPARATOR:
* <p>
* segments[0]: ""<br>
* segments[1]: baseElementHandle<br>
* segments[2]: typeName<br>
* segments[3]: memberName<br>
* segments[4...]: parameterTypeName (optional)
*/
private static final char LINK_SEPARATOR= '\u2602';
private JavaElementLinks() {
// static only
}
/**
* Creates a location listener which uses the given handler
* to handle java element links.
*
* The location listener can be attached to a {@link Browser}
*
* @param handler the handler to use to handle links
* @return a new {@link LocationListener}
*/
public static LocationListener createLocationListener(final ILinkHandler handler) {
return new LocationAdapter() {
@Override
public void changing(LocationEvent event) {
String loc= event.location;
if ("about:blank".equals(loc)) { //$NON-NLS-1$
/*
* Using the Browser.setText API triggers a location change to "about:blank".
* XXX: remove this code once https://bugs.eclipse.org/bugs/show_bug.cgi?id=130314 is fixed
*/
//input set with setText
handler.handleTextSet();
return;
}
event.doit= false;
if (loc.startsWith("about:")) { //$NON-NLS-1$
// Relative links should be handled via head > base tag.
// If no base is available, links just won't work.
return;
}
URI uri;
try {
uri= new URI(loc);
} catch (URISyntaxException e) {
// try it with a file (workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=237903 ):
File file= new File(loc);
if (! file.exists()) {
JavaPlugin.log(e);
return;
}
uri= file.toURI();
loc= uri.toASCIIString();
}
String scheme= uri.getScheme();
if (JavaElementLinks.JAVADOC_VIEW_SCHEME.equals(scheme)) {
IJavaElement linkTarget= JavaElementLinks.parseURI(uri);
if (linkTarget == null)
return;
handler.handleJavadocViewLink(linkTarget);
} else if (JavaElementLinks.JAVADOC_SCHEME.equals(scheme)) {
IJavaElement linkTarget= JavaElementLinks.parseURI(uri);
if (linkTarget == null)
return;
handler.handleInlineJavadocLink(linkTarget);
} else if (JavaElementLinks.OPEN_LINK_SCHEME.equals(scheme)) {
IJavaElement linkTarget= JavaElementLinks.parseURI(uri);
if (linkTarget == null)
return;
handler.handleDeclarationLink(linkTarget);
} else {
try {
if (handler.handleExternalLink(new URL(loc), event.display))
return;
event.doit= true;
} catch (MalformedURLException e) {
JavaPlugin.log(e);
}
}
}
};
}
/**
* Creates an {@link URI} with the given scheme for the given element.
*
* @param scheme the scheme
* @param element the element
* @return an {@link URI}, encoded as {@link URI#toASCIIString() ASCII} string, ready to be used
* as <code>href</code> attribute in an <code><a></code> tag
* @throws URISyntaxException if the arguments were invalid
*/
public static String createURI(String scheme, IJavaElement element) throws URISyntaxException {
return createURI(scheme, element, null, null, null);
}
/**
* Creates an {@link URI} with the given scheme based on the given element.
* The additional arguments specify a member referenced from the given element.
*
* @param scheme a scheme
* @param element the declaring element
* @param refTypeName a (possibly qualified) type name, can be <code>null</code>
* @param refMemberName a member name, can be <code>null</code>
* @param refParameterTypes a (possibly empty) array of (possibly qualified) parameter type
* names, can be <code>null</code>
* @return an {@link URI}, encoded as {@link URI#toASCIIString() ASCII} string, ready to be used
* as <code>href</code> attribute in an <code><a></code> tag
* @throws URISyntaxException if the arguments were invalid
*/
public static String createURI(String scheme, IJavaElement element, String refTypeName, String refMemberName, String[] refParameterTypes) throws URISyntaxException {
/*
* We use an opaque URI, not ssp and fragments (to work around Safari bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=212527 (wrongly encodes #)).
*/
StringBuffer ssp= new StringBuffer(60);
ssp.append(LINK_SEPARATOR); // make sure first character is not a / (would be hierarchical URI)
// replace '[' manually, since URI confuses it for an IPv6 address as per RFC 2732:
ssp.append(element.getHandleIdentifier().replace('[', LINK_BRACKET_REPLACEMENT)); // segments[1]
if (refTypeName != null) {
ssp.append(LINK_SEPARATOR);
ssp.append(refTypeName); // segments[2]
if (refMemberName != null) {
ssp.append(LINK_SEPARATOR);
ssp.append(refMemberName); // segments[3]
if (refParameterTypes != null) {
ssp.append(LINK_SEPARATOR);
for (int i= 0; i < refParameterTypes.length; i++) {
ssp.append(refParameterTypes[i]); // segments[4|5|..]
if (i != refParameterTypes.length - 1) {
ssp.append(LINK_SEPARATOR);
}
}
}
}
}
return new URI(scheme, ssp.toString(), null).toASCIIString();
}
public static IJavaElement parseURI(URI uri) {
String ssp= uri.getSchemeSpecificPart();
String[] segments= ssp.split(String.valueOf(LINK_SEPARATOR), -1);
// replace '[' manually, since URI confuses it for an IPv6 address as per RFC 2732:
IJavaElement element= JavaCore.create(segments[1].replace(LINK_BRACKET_REPLACEMENT, '['));
if (segments.length > 2) {
String refTypeName= segments[2];
if (refTypeName.indexOf('.') == -1) {
try {
IJavaElement resolvedTypeVariable= resolveTypeVariable(element, refTypeName);
if (resolvedTypeVariable != null)
return resolvedTypeVariable;
} catch (JavaModelException e) {
JavaPlugin.log(e);
}
}
if (element instanceof IAnnotation) {
element= element.getParent();
}
if (element instanceof ILocalVariable) {
element= ((ILocalVariable)element).getDeclaringMember();
} else if (element instanceof ITypeParameter) {
element= ((ITypeParameter)element).getDeclaringMember();
}
if (element instanceof IMember && !(element instanceof IType)) {
element= ((IMember) element).getDeclaringType();
}
if (element instanceof IType) {
try {
IType type= (IType) element;
if (refTypeName.length() > 0) {
type= resolveType(type, refTypeName);
}
if (type != null) {
element= type;
if (segments.length > 3) {
String refMemberName= segments[3];
if (segments.length > 4) {
String[] paramSignatures= new String[segments[4].length() == 0 ? 0 : segments.length - 4];
for (int i= 0; i < paramSignatures.length; i++) {
paramSignatures[i]= Signature.createTypeSignature(segments[i + 4], false);
}
IMethod method= type.getMethod(refMemberName, paramSignatures);
IMethod[] methods= type.findMethods(method);
if (methods != null) {
return methods[0];
} else {
//TODO: methods whose signature contains type parameters can not be found
// easily, since the Javadoc references are erasures
//Shortcut: only check name and parameter count:
methods= type.getMethods();
for (int i= 0; i < methods.length; i++) {
method= methods[i];
if (method.getElementName().equals(refMemberName) && method.getNumberOfParameters() == paramSignatures.length)
return method;
}
// reference can also point to method from supertype:
ITypeHierarchy hierarchy= SuperTypeHierarchyCache.getTypeHierarchy(type);
method= JavaModelUtil.findMethodInHierarchy(hierarchy, type, refMemberName, paramSignatures, false);
if (method != null)
return method;
}
} else {
IField field= type.getField(refMemberName);
if (field.exists()) {
return field;
} else {
IMethod[] methods= type.getMethods();
for (int i= 0; i < methods.length; i++) {
IMethod method= methods[i];
if (method.getElementName().equals(refMemberName))
return method;
}
}
}
}
} else {
// FIXME: either remove or show dialog
// JavaPlugin.logErrorMessage("JavaElementLinks could not resolve " + uri); //$NON-NLS-1$
}
return type;
} catch (JavaModelException e) {
JavaPlugin.log(e);
}
}
}
return element;
}
private static IJavaElement resolveTypeVariable(IJavaElement baseElement, String typeVariableName) throws JavaModelException {
while (baseElement != null) {
switch (baseElement.getElementType()) {
case IJavaElement.METHOD:
IMethod method= (IMethod)baseElement;
ITypeParameter[] typeParameters= method.getTypeParameters();
for (int i= 0; i < typeParameters.length; i++) {
ITypeParameter typeParameter= typeParameters[i];
if (typeParameter.getElementName().equals(typeVariableName)) {
return typeParameter;
}
}
break;
case IJavaElement.TYPE:
IType type= (IType)baseElement;
typeParameters= type.getTypeParameters();
for (int i= 0; i < typeParameters.length; i++) {
ITypeParameter typeParameter= typeParameters[i];
if (typeParameter.getElementName().equals(typeVariableName)) {
return typeParameter;
}
}
break;
case IJavaElement.JAVA_MODEL:
case IJavaElement.JAVA_PROJECT:
case IJavaElement.PACKAGE_FRAGMENT:
case IJavaElement.PACKAGE_FRAGMENT_ROOT:
case IJavaElement.CLASS_FILE:
case IJavaElement.COMPILATION_UNIT:
case IJavaElement.PACKAGE_DECLARATION:
case IJavaElement.IMPORT_CONTAINER:
case IJavaElement.IMPORT_DECLARATION:
return null;
default:
break;
}
// look for type parameters in enclosing members:
baseElement= baseElement.getParent();
}
return null;
}
private static IType resolveType(IType baseType, String refTypeName) throws JavaModelException {
if (refTypeName.length() == 0)
return baseType;
String[][] resolvedNames= baseType.resolveType(refTypeName);
if (resolvedNames != null && resolvedNames.length > 0) {
return baseType.getJavaProject().findType(resolvedNames[0][0], resolvedNames[0][1].replace('$', '.'), (IProgressMonitor) null);
} else if (baseType.isBinary()) {
// workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=206597
IType type= baseType.getJavaProject().findType(refTypeName, (IProgressMonitor) null);
if (type == null) {
// could be unqualified reference:
type= baseType.getJavaProject().findType(baseType.getPackageFragment().getElementName() + '.' + refTypeName, (IProgressMonitor) null);
}
return type;
} else {
return null;
}
}
/**
* Creates a link with the given URI and label text.
*
* @param uri the URI
* @param label the label
* @return the HTML link
* @since 3.6
*/
public static String createLink(String uri, String label) {
return "<a href='" + uri + "'>" + label + "</a>"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
/**
* Creates a header link with the given URI and label text.
*
* @param uri the URI
* @param label the label
* @return the HTML link
* @since 3.6
*/
public static String createHeaderLink(String uri, String label) {
return "<a class='header' href='" + uri + "'>" + label + "</a>"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
/**
* Returns the label for a Java element with the flags as defined by {@link JavaElementLabels}.
* Referenced element names in the label (except the given element's name) are rendered as
* header links.
*
* @param element the element to render
* @param flags the rendering flags
* @return the label of the Java element
* @since 3.5
*/
public static String getElementLabel(IJavaElement element, long flags) {
return getElementLabel(element, flags, false);
}
/**
* Returns the label for a Java element with the flags as defined by {@link JavaElementLabels}.
* Referenced element names in the label are rendered as header links.
* If <code>linkAllNames</code> is <code>false</code>, don't link the name of the given element
*
* @param element the element to render
* @param flags the rendering flags
* @param linkAllNames if <code>true</code>, link all names; if <code>false</code>, link all names except original element's name
* @return the label of the Java element
* @since 3.6
*/
public static String getElementLabel(IJavaElement element, long flags, boolean linkAllNames) {
StringBuffer buf= new StringBuffer();
if (!Strings.USE_TEXT_PROCESSOR) {
new JavaElementLinkedLabelComposer(linkAllNames ? null : element, buf).appendElementLabel(element, flags);
return Strings.markJavaElementLabelLTR(buf.toString());
} else {
String label= JavaElementLabels.getElementLabel(element, flags);
return label.replaceAll("<", "<").replaceAll(">", ">"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
}
}
}