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/*******************************************************************************
* 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.search.internal.ui;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Stack;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Item;
import org.eclipse.core.resources.IResource;
import org.eclipse.jface.viewers.ContentViewer;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.search.ui.ISearchResultViewEntry;
/**
* Helper class for updating error markers and other decorators that work on resources.
* Items are mapped to their element's underlying resource.
* Method <code>resourceChanged</code> updates all items that are affected from the changed
* elements.
* @deprecated old search
*/
@Deprecated
class ResourceToItemsMapper {
private static final int NUMBER_LIST_REUSE= 10;
/** map from IResource to {@code Item | List<Item>} **/
private HashMap<IResource, Object> fResourceToItem;
private Stack<List<Item>> fReuseLists;
private ContentViewer fContentViewer;
public ResourceToItemsMapper(ContentViewer viewer) {
fResourceToItem= new HashMap<>();
fReuseLists= new Stack<>();
fContentViewer= viewer;
}
/**
* Must be called from the UI thread.
* @param changedResource changed resources
*/
public void resourceChanged(IResource changedResource) {
Object obj= fResourceToItem.get(changedResource);
if (obj == null) {
// not mapped
} else if (obj instanceof Item) {
updateItem((Item) obj);
} else { // List of Items
@SuppressWarnings("unchecked")
List<Item> list= (List<Item>) obj;
for (int k= 0; k < list.size(); k++) {
updateItem(list.get(k));
}
}
}
private void updateItem(Item item) {
if (!item.isDisposed()) { // defensive code
ILabelProvider lprovider= (ILabelProvider) fContentViewer.getLabelProvider();
Object data= item.getData();
String oldText= item.getText();
String text= lprovider.getText(data);
if (text != null && !text.equals(oldText)) {
item.setText(text);
}
Image oldImage= item.getImage();
Image image= lprovider.getImage(data);
if (image != null && !image.equals(oldImage)) {
item.setImage(image);
}
}
}
/**
* Adds a new item to the map.
* @param element Element to map
* @param item The item used for the element
*/
public void addToMap(Object element, Item item) {
IResource resource= ((ISearchResultViewEntry)element).getResource();
if (resource != null) {
Object existingMapping= fResourceToItem.get(resource);
if (existingMapping == null) {
fResourceToItem.put(resource, item);
} else if (existingMapping instanceof Item) {
if (existingMapping != item) {
List<Item> list= getNewList();
list.add((Item) existingMapping);
list.add(item);
fResourceToItem.put(resource, list);
}
} else { // List
@SuppressWarnings("unchecked")
List<Item> list= (List<Item>) existingMapping;
if (!list.contains(item)) {
list.add(item);
}
}
}
}
/**
* Removes an element from the map.
* @param element element to remove
* @param item The item used for the element
*/
@SuppressWarnings("unlikely-arg-type")
public void removeFromMap(Object element, Item item) {
IResource resource= ((ISearchResultViewEntry)element).getResource();
if (resource != null) {
Object existingMapping= fResourceToItem.get(resource);
if (existingMapping == null) {
return;
} else if (existingMapping instanceof Item) {
fResourceToItem.remove(resource);
} else { // List
@SuppressWarnings("unchecked")
List<Item> list= (List<Item>) existingMapping;
list.remove(item);
if (list.isEmpty()) {
fResourceToItem.remove(list);
releaseList(list);
}
}
}
}
private List<Item> getNewList() {
if (!fReuseLists.isEmpty()) {
return fReuseLists.pop();
}
return new ArrayList<>(2);
}
private void releaseList(List<Item> list) {
if (fReuseLists.size() < NUMBER_LIST_REUSE) {
fReuseLists.push(list);
}
}
/**
* Clears the map.
*/
public void clearMap() {
fResourceToItem.clear();
}
/**
* Tests if the map is empty
* @return returns if the map is empty
*/
public boolean isEmpty() {
return fResourceToItem.isEmpty();
}
}
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