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/*******************************************************************************
* 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 v2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Pivotal Software, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.text.quicksearch.internal.ui;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
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.text.quicksearch.internal.core.priority.DefaultPriorityFunction;
import org.eclipse.text.quicksearch.internal.core.priority.PrioriTree;
import org.eclipse.text.quicksearch.internal.core.priority.PriorityFunction;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IEditorReference;
import org.eclipse.ui.ISelectionService;
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(QuickSearchActivator.getDefault().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() {
if (window == null) {
return Collections.emptyList();
}
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 = input.getAdapter(IFile.class);
if (file != null) {
files.add(file);
}
}
} catch (PartInitException e) {
//Ignore silently. See: https://issuetracker.springsource.com/browse/STS-4156
//Rationale: Whatever may be the reason we can't obtain a 'input' for the editor.
//It likely means there's no text to search in that editor, so it is safe to ignore
//without loss of functionality to the quicksearch engine.
//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() {
if (window == null) {
return null;
}
IWorkbenchPage page = window.getActivePage();
if (page!=null) {
IEditorPart editor = page.getActiveEditor();
if (editor!=null) {
IEditorInput input = editor.getEditorInput();
if (input!=null) {
return 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() {
if (window == null) {
return Collections.emptyList();
}
ISelectionService selectionService = window.getSelectionService();
ISelection selection = selectionService.getSelection();
if (selection instanceof IStructuredSelection) {
IStructuredSelection structuredSelection = (IStructuredSelection) selection;
if (!structuredSelection.isEmpty()) {
Object[] elements = structuredSelection.toArray();
List<IResource> resources = new ArrayList<>(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 = ae.getAdapter(IResource.class);
if (r!=null) {
resources.add(r);
}
}
}
return resources;
}
}
return Collections.emptyList();
}
}
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