Java tutorial
/******************************************************************************* * Copyright (c) 2011 itemis AG (http://www.itemis.eu) 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 *******************************************************************************/ package org.summer.dsl.xbase.ui.launching; import java.util.List; import java.util.Set; import org.apache.log4j.Logger; import org.eclipse.core.resources.IFile; import org.eclipse.core.resources.IResource; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.runtime.IAdaptable; import org.eclipse.emf.common.util.URI; import org.eclipse.emf.ecore.EObject; import org.eclipse.emf.ecore.util.EcoreUtil; import org.eclipse.jdt.core.IJavaElement; import org.eclipse.jdt.core.IJavaProject; import org.eclipse.jdt.core.JavaCore; import org.eclipse.jface.text.ITextSelection; import org.eclipse.jface.viewers.ISelection; import org.eclipse.ui.IEditorPart; import org.eclipse.ui.IFileEditorInput; import org.eclipse.ui.IWorkbench; import org.eclipse.ui.IWorkbenchPage; import org.eclipse.ui.IWorkbenchWindow; import org.eclipse.xtext.EcoreUtil2; import org.summer.dsl.model.types.JvmIdentifiableElement; import org.summer.dsl.model.types.util.jdt.IJavaElementFinder; import org.eclipse.xtext.generator.IDerivedResourceMarkers; import org.eclipse.xtext.nodemodel.ILeafNode; import org.eclipse.xtext.nodemodel.INode; import org.eclipse.xtext.nodemodel.util.NodeModelUtils; import org.eclipse.xtext.parser.IParseResult; import org.eclipse.xtext.parsetree.reconstr.impl.NodeIterator; import org.eclipse.xtext.resource.FileExtensionProvider; import org.eclipse.xtext.resource.XtextResource; import org.eclipse.xtext.ui.editor.XtextEditor; import org.eclipse.xtext.util.concurrent.IUnitOfWork; import org.summer.dsl.xbase.jvmmodel.IJvmModelAssociations; import com.google.inject.Inject; /** * @author Sebastian Zarnekow - Initial contribution and API * @author Moritz Eysholdt */ public class JavaElementDelegate implements IAdaptable { private static final Logger log = Logger.getLogger(JavaElementDelegate.class); private IEditorPart editor; private IResource resource; @Inject private IDerivedResourceMarkers derivedResourceMarkers; @Inject private FileExtensionProvider fileExtensionProvider; @Inject private IJvmModelAssociations associations; @Inject private IJavaElementFinder elementFinder; @Inject private IWorkbench workbench; public void initializeWith(IEditorPart editorInput) { this.editor = editorInput; } public void initializeWith(IFileEditorInput editorInput) { this.resource = editorInput.getFile(); IWorkbenchWindow activeWorkbenchWindow = workbench.getActiveWorkbenchWindow(); if (activeWorkbenchWindow != null) { IWorkbenchPage activePage = activeWorkbenchWindow.getActivePage(); this.editor = activePage != null ? activePage.findEditor(editorInput) : null; } } public void initializeWith(IResource resource) { this.resource = resource; } public Object getAdapter(@SuppressWarnings("rawtypes") Class adapter) { if (IJavaElement.class.equals(adapter)) { if (editor != null) { IJavaElement javaMethod = getJavaElementForXtextEditor(editor); if (javaMethod != null) { return javaMethod; } } if (resource != null && fileExtensionProvider.isValid(resource.getFileExtension())) { return getJavaElementForResource(resource); } } return null; } protected IJavaElement findJavaElement(XtextResource resource, int offset) { IParseResult parseResult = resource.getParseResult(); if (parseResult == null) return null; INode root = parseResult.getRootNode(); INode node = NodeModelUtils.findLeafNodeAtOffset(root, offset); if (node == null) return null; INode previousSementic = null, nextSemantic = null; NodeIterator backwards = new NodeIterator(node); while (backwards.hasPrevious()) { INode n = backwards.previous(); if (n instanceof ILeafNode && !((ILeafNode) n).isHidden()) { previousSementic = n; break; } } NodeIterator forward = new NodeIterator(node); while (forward.hasNext()) { INode n = forward.next(); if (n instanceof ILeafNode && !((ILeafNode) n).isHidden()) { nextSemantic = n; break; } } if (previousSementic == null || nextSemantic == null) return null; EObject prevObj = NodeModelUtils.findActualSemanticObjectFor(previousSementic); EObject nextObj = NodeModelUtils.findActualSemanticObjectFor(nextSemantic); if (prevObj == null || nextObj == null) return null; EObject element = findCommonContainer(prevObj, nextObj); JvmIdentifiableElement jvmElement = findAssociatedJvmElement(element); if (jvmElement == null) return null; IJavaElement javaElement = elementFinder.findElementFor(jvmElement); return javaElement; } protected JvmIdentifiableElement findAssociatedJvmElement(EObject element) { if (element == null) return null; Set<EObject> elements = associations.getJvmElements(element); if (elements.isEmpty()) { return findAssociatedJvmElement(element.eContainer()); } EObject next = elements.iterator().next(); if (next instanceof JvmIdentifiableElement) return (JvmIdentifiableElement) next; return EcoreUtil2.getContainerOfType(next, JvmIdentifiableElement.class); } protected EObject findCommonContainer(EObject prevObj, EObject nextObj) { if (prevObj == null) return nextObj; if (nextObj == null) return null; if (prevObj == nextObj) return prevObj; if (EcoreUtil.isAncestor(prevObj, nextObj)) { return prevObj; } if (EcoreUtil.isAncestor(nextObj, prevObj)) { return nextObj; } return findCommonContainer(prevObj.eContainer(), nextObj.eContainer()); } protected IJavaElement getJavaElementForXtextEditor(IEditorPart editor) { if (!(editor instanceof XtextEditor)) return null; IJavaProject jp = null; if (editor.getEditorInput() instanceof IFileEditorInput) { IFile file = ((IFileEditorInput) editor.getEditorInput()).getFile(); if (!fileExtensionProvider.isValid(file.getFileExtension())) { return null; } jp = JavaCore.create(file.getProject()); if (jp == null || !jp.exists() || !jp.isOpen()) return null; } else { return null; } XtextEditor xtextEditor = (XtextEditor) editor; ISelection selection = xtextEditor.getSelectionProvider().getSelection(); if (!(selection instanceof ITextSelection)) return null; final int offset = ((ITextSelection) selection).getOffset(); IJavaElement func = xtextEditor.getDocument().readOnly(new IUnitOfWork<IJavaElement, XtextResource>() { public IJavaElement exec(XtextResource state) throws Exception { return findJavaElement(state, offset); } }); return func; } protected IJavaElement getJavaElementForEditor(IEditorPart editor) { if (editor.getEditorInput() instanceof IFileEditorInput) { IFile file = ((IFileEditorInput) editor.getEditorInput()).getFile(); if (fileExtensionProvider.isValid(file.getFileExtension())) { return getJavaElementForResource(file); } } return null; } protected IJavaElement getJavaElementForResource(IResource resource) { try { final String getSourcePath = URI.createPlatformResourceURI(resource.getFullPath().toString(), true) .toString(); List<IFile> resources = derivedResourceMarkers.findDerivedResources(resource.getProject(), getSourcePath); for (IFile file : resources) { if (containsElementsSearchedFor(file)) return JavaCore.create(file); } } catch (CoreException e) { if (log.isDebugEnabled()) { log.debug(e.getMessage(), e); } } return null; } protected boolean containsElementsSearchedFor(IFile file) { return false; } }