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/*******************************************************************************
* Copyright (c) 2000, 2015 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.action;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* A SubContributionManager is used to define a set of contribution
* items within a parent manager. Once defined, the visibility of the entire set can
* be changed as a unit.
*/
public abstract class SubContributionManager implements IContributionManager {
/**
* The parent contribution manager.
*/
private IContributionManager parentMgr;
/**
* Maps each item in the manager to a wrapper. The wrapper is used to
* control the visibility of each item.
*/
private Map mapItemToWrapper = new HashMap<>();
/**
* The visibility of the manager,
*/
private boolean visible = false;
/**
* Constructs a new SubContributionManager
*
* @param mgr the parent contribution manager. All contributions made to the
* SubContributionManager are forwarded and appear in the
* parent manager.
*/
public SubContributionManager(IContributionManager mgr) {
super();
parentMgr = mgr;
}
@Override
public void add(IAction action) {
add(new ActionContributionItem(action));
}
@Override
public void add(IContributionItem item) {
SubContributionItem wrap = wrap(item);
wrap.setVisible(visible);
parentMgr.add(wrap);
itemAdded(item, wrap);
}
@Override
public void appendToGroup(String groupName, IAction action) {
appendToGroup(groupName, new ActionContributionItem(action));
}
@Override
public void appendToGroup(String groupName, IContributionItem item) {
SubContributionItem wrap = wrap(item);
wrap.setVisible(visible);
parentMgr.appendToGroup(groupName, wrap);
itemAdded(item, wrap);
}
/**
* Disposes this sub contribution manager, removing all its items
* and cleaning up any other resources allocated by it.
* This must leave no trace of this sub contribution manager
* in the parent manager. Subclasses may extend.
*
* @since 3.0
*/
public void disposeManager() {
Iterator it = mapItemToWrapper.values().iterator();
// Dispose items in addition to removing them.
// See bugs 64024 and 73715 for details.
// Do not use getItems() here as subclasses can override that in bad ways.
while (it.hasNext()) {
IContributionItem item = it.next();
item.dispose();
}
removeAll();
}
@Override
public IContributionItem find(String id) {
IContributionItem item = parentMgr.find(id);
return unwrap(item);
}
@Override
public IContributionItem[] getItems() {
IContributionItem[] result = new IContributionItem[mapItemToWrapper
.size()];
mapItemToWrapper.keySet().toArray(result);
return result;
}
/**
* Returns the parent manager.
*
* @return the parent manager
*/
public IContributionManager getParent() {
return parentMgr;
}
@Override
public IContributionManagerOverrides getOverrides() {
return parentMgr.getOverrides();
}
@Override
public void insertAfter(String id, IAction action) {
insertAfter(id, new ActionContributionItem(action));
}
@Override
public void insertAfter(String id, IContributionItem item) {
SubContributionItem wrap = wrap(item);
wrap.setVisible(visible);
parentMgr.insertAfter(id, wrap);
itemAdded(item, wrap);
}
@Override
public void insertBefore(String id, IAction action) {
insertBefore(id, new ActionContributionItem(action));
}
@Override
public void insertBefore(String id, IContributionItem item) {
SubContributionItem wrap = wrap(item);
wrap.setVisible(visible);
parentMgr.insertBefore(id, wrap);
itemAdded(item, wrap);
}
@Override
public boolean isDirty() {
return parentMgr.isDirty();
}
@Override
public boolean isEmpty() {
return parentMgr.isEmpty();
}
/**
* Returns whether the contribution list is visible.
* If the visibility is true then each item within the manager
* appears within the parent manager. Otherwise, the items are not visible.
*
* @return true if the manager is visible
*/
public boolean isVisible() {
return visible;
}
/**
* Notifies that an item has been added.
*
* Subclasses are not expected to override this method.
*
*
* @param item the item contributed by the client
* @param wrap the item contributed to the parent manager as a proxy for the item
* contributed by the client
*/
protected void itemAdded(IContributionItem item, SubContributionItem wrap) {
item.setParent(this);
mapItemToWrapper.put(item, wrap);
}
/**
* Notifies that an item has been removed.
*
* Subclasses are not expected to override this method.
*
*
* @param item the item contributed by the client
*/
protected void itemRemoved(IContributionItem item) {
mapItemToWrapper.remove(item);
item.setParent(null);
}
/**
* @return fetch all enumeration of wrappers for the item
* @deprecated Use getItems(String value) instead.
*/
@Deprecated
public Enumeration items() {
final Iterator i = mapItemToWrapper.values().iterator();
return new Enumeration<>() {
@Override
public boolean hasMoreElements() {
return i.hasNext();
}
@Override
public SubContributionItem nextElement() {
return i.next();
}
};
}
@Override
public void markDirty() {
parentMgr.markDirty();
}
@Override
public void prependToGroup(String groupName, IAction action) {
prependToGroup(groupName, new ActionContributionItem(action));
}
@Override
public void prependToGroup(String groupName, IContributionItem item) {
SubContributionItem wrap = wrap(item);
wrap.setVisible(visible);
parentMgr.prependToGroup(groupName, wrap);
itemAdded(item, wrap);
}
@Override
public IContributionItem remove(String id) {
IContributionItem result = parentMgr.remove(id);
// result is the wrapped item
if (result != null) {
IContributionItem item = unwrap(result);
itemRemoved(item);
}
return result;
}
@Override
public IContributionItem remove(IContributionItem item) {
SubContributionItem wrap = mapItemToWrapper
.get(item);
if (wrap == null) {
return null;
}
IContributionItem result = parentMgr.remove(wrap);
if (result == null) {
return null;
}
itemRemoved(item);
return item;
}
@Override
public void removeAll() {
Object[] array = mapItemToWrapper.keySet().toArray();
for (Object element : array) {
IContributionItem item = (IContributionItem) element;
remove(item);
}
mapItemToWrapper.clear();
}
/**
* Sets the visibility of the manager. If the visibility is true
* then each item within the manager appears within the parent manager.
* Otherwise, the items are not visible.
*
* @param visible the new visibility
*/
public void setVisible(boolean visible) {
this.visible = visible;
if (mapItemToWrapper.size() > 0) {
Iterator it = mapItemToWrapper.values().iterator();
while (it.hasNext()) {
IContributionItem item = it.next();
item.setVisible(visible);
}
parentMgr.markDirty();
}
}
/**
* Wraps a contribution item in a sub contribution item, and returns the new wrapper.
* @param item the contribution item to be wrapped
* @return the wrapped item
*/
protected SubContributionItem wrap(IContributionItem item) {
return new SubContributionItem(item);
}
/**
* Unwraps a nested contribution item. If the contribution item is an
* instance of SubContributionItem, then its inner item is
* returned. Otherwise, the item itself is returned.
*
* @param item
* The item to unwrap; may be null.
* @return The inner item of item, if item is
* a SubContributionItem;item
* otherwise.
*/
protected IContributionItem unwrap(IContributionItem item) {
if (item instanceof SubContributionItem) {
return ((SubContributionItem) item).getInnerItem();
}
return item;
}
}