/*******************************************************************************
* 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.jst.jsp.ui.internal.hyperlink;
import org.eclipse.core.filebuffers.FileBuffers;
import org.eclipse.core.filebuffers.ITextFileBuffer;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.ui.JavaElementLabels;
import org.eclipse.jdt.ui.JavaUI;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.hyperlink.AbstractHyperlinkDetector;
import org.eclipse.jface.text.hyperlink.IHyperlink;
import org.eclipse.jst.jsp.core.internal.Logger;
import org.eclipse.jst.jsp.ui.internal.JSPUIMessages;
import org.eclipse.osgi.util.NLS;
import org.eclipse.ui.PartInitException;
import org.eclipse.wst.sse.core.StructuredModelManager;
import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel;
import org.eclipse.wst.sse.core.utils.StringUtils;
/**
* Detects hyper-links in Tag Library Descriptors
*/
public class XMLJavaHyperlinkDetector extends AbstractHyperlinkDetector {
private static final String JAR_FILE_PROTOCOL = "jar:file:"; //$NON-NLS-1$
/**
* Based on org.eclipse.jdt.internal.ui.javaeditor.JavaElementHyperlink
*/
static class JavaElementHyperlink implements IHyperlink {
private final IJavaElement fElement;
private final IRegion fRegion;
/**
* Creates a new Java element hyperlink.
*
* @param region
* the region of the link
* @param element
* the java element to open
* @param qualify
* <code>true</code> if the hyper-link text should show a
* qualified name for element.
*/
JavaElementHyperlink(IRegion region, IJavaElement element) {
fRegion = region;
fElement = element;
}
public IRegion getHyperlinkRegion() {
return fRegion;
}
public String getHyperlinkText() {
String elementLabel = JavaElementLabels.getElementLabel(fElement, JavaElementLabels.ALL_POST_QUALIFIED);
return NLS.bind(JSPUIMessages.Open, elementLabel);
}
public String getTypeLabel() {
return null;
}
public void open() {
try {
JavaUI.openInEditor(fElement);
}
catch (PartInitException e) {
}
catch (JavaModelException e) {
}
}
}
private IHyperlink createHyperlink(String elementName, IRegion region, IDocument document) {
// try file buffers
ITextFileBuffer textFileBuffer = FileBuffers.getTextFileBufferManager().getTextFileBuffer(document);
if (textFileBuffer != null) {
IPath basePath = textFileBuffer.getLocation();
if (basePath != null && !basePath.isEmpty()) {
IProject project = ResourcesPlugin.getWorkspace().getRoot().getProject(basePath.segment(0));
if (basePath.segmentCount() > 1 && project.isAccessible()) {
return createJavaElementHyperlink(JavaCore.create(project), elementName, region);
}
}
}
// fallback to SSE-specific knowledge
IStructuredModel model = null;
try {
model = StructuredModelManager.getModelManager().getExistingModelForRead(document);
if (model != null) {
String baseLocation = model.getBaseLocation();
// URL fixup from the taglib index record
if (baseLocation.startsWith("jar:/file:")) { //$NON-NLS-1$
baseLocation = StringUtils.replace(baseLocation, "jar:/", "jar:"); //$NON-NLS-1$ //$NON-NLS-2$
}
/*
* Handle opened TLD files from JARs on the Java Build Path by
* finding a package fragment root for the same .jar file and
* opening the class from there. Note that this might be from
* a different Java project's build path than the TLD.
*/
if (baseLocation.startsWith(JAR_FILE_PROTOCOL) && baseLocation.indexOf('!') > JAR_FILE_PROTOCOL.length()) {
String baseFile = baseLocation.substring(JAR_FILE_PROTOCOL.length(), baseLocation.indexOf('!'));
IPath basePath = new Path(baseFile);
IProject[] projects = ResourcesPlugin.getWorkspace().getRoot().getProjects();
for (int i = 0; i < projects.length; i++) {
try {
if (projects[i].isAccessible() && projects[i].hasNature(JavaCore.NATURE_ID)) {
IJavaProject javaProject = JavaCore.create(projects[i]);
if (javaProject.exists()) {
IPackageFragmentRoot root = javaProject.findPackageFragmentRoot(basePath);
if (root != null) {
return createJavaElementHyperlink(javaProject, elementName, region);
}
}
}
}
catch (CoreException e) {
Logger.logException(e);
}
}
}
else {
IPath basePath = new Path(baseLocation);
if (basePath.segmentCount() > 1) {
return createJavaElementHyperlink(JavaCore.create(ResourcesPlugin.getWorkspace().getRoot().getProject(basePath.segment(0))), elementName, region);
}
}
}
}
finally {
if (model != null)
model.releaseFromRead();
}
return null;
}
private IHyperlink createJavaElementHyperlink(IJavaProject javaProject, String elementName, IRegion region) {
if (javaProject != null && javaProject.exists()) {
try {
IJavaElement element = javaProject.findType(elementName);
if (element != null && element.exists()) {
return new JavaElementHyperlink(region, element);
}
}
catch (JavaModelException e) {
// bad name, no link
}
}
return null;
}
/*
* (non-Javadoc)
*
* @see
* org.eclipse.jface.text.hyperlink.IHyperlinkDetector#detectHyperlinks
* (org.eclipse.jface.text.ITextViewer, org.eclipse.jface.text.IRegion,
* boolean)
*/
public IHyperlink[] detectHyperlinks(ITextViewer textViewer, IRegion region, boolean canShowMultipleHyperlinks) {
if (region != null && textViewer != null) {
IDocument document = textViewer.getDocument();
// find hyperlink range for Java element
IRegion hyperlinkRegion = region.getLength() > 0 ? region : selectQualifiedName(document, region.getOffset());
String name = null;
try {
name = document.get(hyperlinkRegion.getOffset(), hyperlinkRegion.getLength()).trim();
}
catch (BadLocationException e) {
}
if (name != null) {
IHyperlink link = createHyperlink(name, hyperlinkRegion, document);
if (link != null)
return new IHyperlink[]{link};
}
}
return null;
}
/**
* Java always selects word when defining region
*
* @param document
* @param anchor
* @return IRegion
*/
private IRegion selectQualifiedName(IDocument document, int anchor) {
try {
int offset = anchor;
char c;
while (offset >= 0) {
c = document.getChar(offset);
if (!Character.isJavaIdentifierPart(c) && c != '.')
break;
--offset;
}
int start = offset;
offset = anchor;
int length = document.getLength();
while (offset < length) {
c = document.getChar(offset);
if (!Character.isJavaIdentifierPart(c) && c != '.')
break;
++offset;
}
int end = offset;
if (start == end)
return new Region(start, 0);
return new Region(start + 1, end - start - 1);
}
catch (BadLocationException x) {
return null;
}
}
}