Java tutorial
/******************************************************************************* * Copyright (c) 2013 Pivotal Software, Inc. * 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: * Pivotal Software, Inc. - initial API and implementation *******************************************************************************/ package org.becausecucumber.eclipse.plugin.common.searcher; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.Collections; import java.util.List; import org.becausecucumber.eclipse.plugin.common.Activator; import org.becausecucumber.eclipse.plugin.common.searcher.priority.DefaultPriorityFunction; import org.becausecucumber.eclipse.plugin.common.searcher.priority.PrioriTree; import org.becausecucumber.eclipse.plugin.common.searcher.priority.PriorityFunction; import org.eclipse.core.resources.IFile; import org.eclipse.core.resources.IResource; import org.eclipse.core.runtime.IAdaptable; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.ui.IEditorInput; import org.eclipse.ui.IEditorPart; import org.eclipse.ui.IEditorReference; import org.eclipse.ui.IWorkbenchPage; import org.eclipse.ui.IWorkbenchWindow; import org.eclipse.ui.PartInitException; /** * An instance of this class groups together some logic to inform the * quicksearch dialog about 'search context'. I.e. things such as the * current selection and open editors when the dialog is opened. * <p> * This contextual information is used to inform the PriorityFunction * for the search process. * * @author Kris De Volder */ public class QuickSearchContext { /** * We remember the last result of getOpenFiles in here. This is so that we can return this * if we are having trouble to compute the open files. Sometimes we may not be able to * access the active workbench page etc. In this case it is probably better to return * a stale list of files than nothing at all. */ private static Collection<IFile> lastOpenFiles = Arrays.asList(); //Empty list to start with. private IWorkbenchWindow window; public QuickSearchContext(IWorkbenchWindow window) { this.window = window; } /** * Create a walker priority function based on the current 'context'. */ public PriorityFunction createPriorityFun() { PrioriTree priorities = PrioriTree.create(); priorities.configure(Activator.getPreferences()); try { // TODO: This is not working correctly right now, if the selected resources are containers / folders. // The PrioriTree only assigns a priority to the folder itself, but not to its children. // So open editors will automatically take priority over the children of selected projects. // To fix, PrioriTree will need a mechanism to assign priorities to children. // If doing so, care must be taken not to accidentally assign priorities to ignored // resources. Collection<IResource> selectedResources = getSelectedResources(); for (IResource r : selectedResources) { priorities.setPriority(r.getFullPath(), 3 * PriorityFunction.PRIORITY_INTERESTING); } IFile currentFile = getActiveFile(); if (currentFile != null) { //Current file is more interesting than other open files priorities.setPriority(currentFile.getFullPath(), 2 * PriorityFunction.PRIORITY_INTERESTING); } Collection<IFile> openFiles = getOpenFiles(); for (IFile file : openFiles) { priorities.setPriority(file.getFullPath(), PriorityFunction.PRIORITY_INTERESTING); } return priorities; } catch (Throwable e) { //QuickSearchActivator.log(e); } return new DefaultPriorityFunction(); } private Collection<IFile> getOpenFiles() { try { IWorkbenchPage page = window.getActivePage(); if (page != null) { Collection<IFile> files = new ArrayList<IFile>(); IEditorReference[] editors = page.getEditorReferences(); if (editors != null) { for (IEditorReference editor : editors) { try { IEditorInput input = editor.getEditorInput(); if (input != null) { IFile file = (IFile) input.getAdapter(IFile.class); if (file != null) { files.add(file); } } } catch (PartInitException e) { //QuickSearchActivator.log(e); } } lastOpenFiles = files; return files; } } return lastOpenFiles; } finally { } } /** * Gets the IFile that is currently open in the active editor. * @return IFile or null if there is no current editor or the editor isn't associated to a file. */ private IFile getActiveFile() { IWorkbenchPage page = window.getActivePage(); if (page != null) { IEditorPart editor = page.getActiveEditor(); if (editor != null) { IEditorInput input = editor.getEditorInput(); if (input != null) { return (IFile) input.getAdapter(IFile.class); } } } return null; } /** * Get a Collection of selected resources from the active selection if that selection is * a Structured selection (e.g. in navigator or project/package explorer) */ private Collection<IResource> getSelectedResources() { ISelection _s = window.getSelectionService().getSelection(); if (_s != null && _s instanceof IStructuredSelection) { IStructuredSelection s = (IStructuredSelection) _s; if (s != null && !s.isEmpty()) { Object[] elements = s.toArray(); List<IResource> resources = new ArrayList<IResource>(elements.length); for (Object e : elements) { if (e instanceof IResource) { resources.add((IResource) e); } else if (e instanceof IAdaptable) { IAdaptable ae = (IAdaptable) e; IResource r = (IResource) ae.getAdapter(IResource.class); if (r != null) { resources.add(r); } } } return resources; } } return Collections.emptyList(); } }