| /******************************************************************************* |
| * Copyright (c) 2000, 2015 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.ui.internal; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.ui.IEditorDescriptor; |
| import org.eclipse.ui.IEditorInput; |
| import org.eclipse.ui.IMemento; |
| |
| /** |
| * This class is used to record "open editor" actions as they |
| * happen. The input and type of each editor are recorded so that |
| * the user can reopen an item from the recently used files list. |
| */ |
| public class EditorHistory { |
| /** |
| * The maximum of entries in the history. |
| */ |
| public static final int MAX_SIZE = 15; |
| |
| /** |
| * The list of editor entries, in FIFO order. |
| */ |
| private ArrayList fifoList = new ArrayList(MAX_SIZE); |
| |
| /** |
| * Constructs a new history. |
| */ |
| public EditorHistory() { |
| super(); |
| } |
| |
| /** |
| * Adds an item to the history. Added in fifo fashion. |
| */ |
| public void add(IEditorInput input, IEditorDescriptor desc) { |
| if (input != null && input.exists()) { |
| add(new EditorHistoryItem(input, desc), 0); |
| } |
| } |
| |
| /** |
| * Adds an item to the history. |
| */ |
| private void add(EditorHistoryItem newItem, int index) { |
| // Remove the item if it already exists so that it will be put |
| // at the top of the list. |
| if (newItem.isRestored()) { |
| remove(newItem.getInput()); |
| } |
| |
| // Remove the oldest one |
| if (fifoList.size() == MAX_SIZE) { |
| fifoList.remove(MAX_SIZE - 1); |
| } |
| |
| // Add the new item. |
| fifoList.add(index < MAX_SIZE ? index : MAX_SIZE - 1, newItem); |
| } |
| |
| /** |
| * Returns an array of editor history items. The items are returned in order |
| * of most recent first. |
| */ |
| public EditorHistoryItem[] getItems() { |
| refresh(); |
| EditorHistoryItem[] array = new EditorHistoryItem[fifoList.size()]; |
| fifoList.toArray(array); |
| return array; |
| } |
| |
| /** |
| * Refresh the editor list. Any stale items are removed. |
| * Only restored items are considered. |
| */ |
| public void refresh() { |
| Iterator iter = fifoList.iterator(); |
| while (iter.hasNext()) { |
| EditorHistoryItem item = (EditorHistoryItem) iter.next(); |
| if (item.isRestored()) { |
| IEditorInput input = item.getInput(); |
| if (input != null && !input.exists()) { |
| iter.remove(); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Removes the given history item. |
| */ |
| public void remove(EditorHistoryItem item) { |
| fifoList.remove(item); |
| } |
| |
| /** |
| * Removes all traces of an editor input from the history. |
| */ |
| public void remove(IEditorInput input) { |
| if (input == null) { |
| return; |
| } |
| Iterator iter = fifoList.iterator(); |
| while (iter.hasNext()) { |
| EditorHistoryItem item = (EditorHistoryItem) iter.next(); |
| if (item.matches(input)) { |
| iter.remove(); |
| } |
| } |
| } |
| |
| /** |
| * Restore the most-recently-used history from the given memento. |
| * |
| * @param memento the memento to restore the mru history from |
| */ |
| public IStatus restoreState(IMemento memento) { |
| IMemento[] mementos = memento.getChildren(IWorkbenchConstants.TAG_FILE); |
| for (int i = 0; i < mementos.length; i++) { |
| EditorHistoryItem item = new EditorHistoryItem(mementos[i]); |
| if (!"".equals(item.getName()) || !"".equals(item.getToolTipText())) { //$NON-NLS-1$ //$NON-NLS-2$ |
| add(item, fifoList.size()); |
| } |
| } |
| return Status.OK_STATUS; |
| } |
| |
| /** |
| * Save the most-recently-used history in the given memento. |
| * |
| * @param memento the memento to save the mru history in |
| */ |
| public IStatus saveState(IMemento memento) { |
| Iterator iterator = fifoList.iterator(); |
| while (iterator.hasNext()) { |
| EditorHistoryItem item = (EditorHistoryItem) iterator.next(); |
| if (item.canSave()) { |
| IMemento itemMemento = memento |
| .createChild(IWorkbenchConstants.TAG_FILE); |
| item.saveState(itemMemento); |
| } |
| } |
| return Status.OK_STATUS; |
| } |
| } |