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/*******************************************************************************
* Copyright (c) 2011 Wind River Systems, Inc. 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tm.te.ui.views.workingsets;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.tm.te.runtime.interfaces.workingsets.IWorkingSetElement;
import org.eclipse.tm.te.ui.views.interfaces.IUIConstants;
import org.eclipse.tm.te.ui.views.internal.ViewRoot;
import org.eclipse.ui.IAggregateWorkingSet;
import org.eclipse.ui.IMemento;
import org.eclipse.ui.IWorkingSet;
import org.eclipse.ui.internal.navigator.NavigatorContentService;
import org.eclipse.ui.navigator.CommonNavigator;
import org.eclipse.ui.navigator.CommonViewer;
import org.eclipse.ui.navigator.ICommonContentExtensionSite;
import org.eclipse.ui.navigator.ICommonContentProvider;
import org.eclipse.ui.navigator.IExtensionStateModel;
/**
* Provides children and parents for IWorkingSets.
* <p>
* Copied and adapted from <code>org.eclipse.ui.internal.navigator.workingsets.WorkingSetContentProvider</code>.
*/
@SuppressWarnings("restriction")
public class WorkingSetsContentProvider implements ICommonContentProvider {
/**
* The extension id for the WorkingSet extension.
*/
public static final String EXTENSION_ID = "org.eclipse.tm.te.ui.views.navigator.workingSets"; //$NON-NLS-1$
/**
* A key used by the Extension State Model to keep track of whether top level Working Sets or
* Projects should be shown in the viewer.
*/
public static final String SHOW_TOP_LEVEL_WORKING_SETS = EXTENSION_ID + ".showTopLevelWorkingSets"; //$NON-NLS-1$
private static final Object[] NO_CHILDREN = new Object[0];
private WorkingSetHelper helper;
/* default */ IAggregateWorkingSet workingSetRoot;
private IExtensionStateModel extensionStateModel;
private CommonNavigator targetExplorer;
private CommonViewer viewer;
private IPropertyChangeListener rootModeListener = new IPropertyChangeListener() {
/* (non-Javadoc)
* @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
*/
@SuppressWarnings("synthetic-access")
@Override
public void propertyChange(PropertyChangeEvent event) {
if (SHOW_TOP_LEVEL_WORKING_SETS.equals(event.getProperty())) {
updateRootMode();
}
}
};
/* (non-Javadoc)
* @see org.eclipse.ui.navigator.ICommonContentProvider#init(org.eclipse.ui.navigator.ICommonContentExtensionSite)
*/
@Override
public void init(ICommonContentExtensionSite config) {
NavigatorContentService cs = (NavigatorContentService) config.getService();
viewer = (CommonViewer) cs.getViewer();
targetExplorer = viewer.getCommonNavigator();
extensionStateModel = config.getExtensionStateModel();
extensionStateModel.addPropertyChangeListener(rootModeListener);
updateRootMode();
}
/*
* (non-Javadoc)
* @see org.eclipse.ui.navigator.IMementoAware#restoreState(org.eclipse.ui.IMemento)
*/
@Override
public void restoreState(IMemento aMemento) {
}
/*
* (non-Javadoc)
* @see org.eclipse.ui.navigator.IMementoAware#saveState(org.eclipse.ui.IMemento)
*/
@Override
public void saveState(IMemento aMemento) {
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
*/
@Override
public Object[] getChildren(Object parentElement) {
if (parentElement instanceof IWorkingSet) {
IWorkingSet workingSet = (IWorkingSet) parentElement;
if (workingSet.isAggregateWorkingSet() && targetExplorer != null) {
switch (targetExplorer.getRootMode()) {
case IUIConstants.MODE_WORKING_SETS:
return ((IAggregateWorkingSet) workingSet).getComponents();
case IUIConstants.MODE_NORMAL:
return getWorkingSetElements(workingSet);
}
}
return getWorkingSetElements(workingSet);
}
return NO_CHILDREN;
}
/* default */ IAdaptable[] getWorkingSetElements(IWorkingSet workingSet) {
Assert.isNotNull(workingSet);
List<IAdaptable> elements = new ArrayList<IAdaptable>();
for (IAdaptable candidate : workingSet.getElements()) {
if (candidate instanceof WorkingSetElementHolder) {
WorkingSetElementHolder holder = (WorkingSetElementHolder)candidate;
IWorkingSetElement element = holder.getElement();
// If the element is null, try to look up the element through the content provider
if (element == null) {
ITreeContentProvider contentProvider = (ITreeContentProvider)viewer.getContentProvider();
for (Object elementCandidate : contentProvider.getElements(ViewRoot.getInstance())) {
if (elementCandidate instanceof IWorkingSetElement && ((IWorkingSetElement)elementCandidate).getElementId().equals(holder.getElementId())) {
holder.setElement((IWorkingSetElement)elementCandidate);
element = holder.getElement();
break;
}
}
}
if (element != null) elements.add(element);
} else {
elements.add(candidate);
}
}
return elements.toArray(new IAdaptable[elements.size()]);
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
*/
@Override
public Object getParent(Object element) {
if (helper != null) return helper.getParent(element);
return null;
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
*/
@Override
public boolean hasChildren(Object element) {
return true;
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.ITreeContentProvider#getElements(java.lang.Object)
*/
@Override
public Object[] getElements(Object inputElement) {
return getChildren(inputElement);
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.IContentProvider#dispose()
*/
@Override
public void dispose() {
helper = null;
extensionStateModel.removePropertyChangeListener(rootModeListener);
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
*/
@Override
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
if (newInput instanceof IWorkingSet) {
IWorkingSet rootSet = (IWorkingSet) newInput;
helper = new WorkingSetHelper(rootSet);
}
}
private void updateRootMode() {
if (targetExplorer == null) {
return;
}
if (extensionStateModel.getBooleanProperty(SHOW_TOP_LEVEL_WORKING_SETS)) {
targetExplorer.setRootMode(IUIConstants.MODE_WORKING_SETS);
}
else {
targetExplorer.setRootMode(IUIConstants.MODE_NORMAL);
}
}
protected class WorkingSetHelper {
private final IWorkingSet workingSet;
private final Map<Object, Object> parents = new WeakHashMap<Object, Object>();
/**
* Create a Helper class for the given working set
*
* @param set The set to use to build the item to parent map.
*/
public WorkingSetHelper(IWorkingSet set) {
workingSet = set;
if (workingSet.isAggregateWorkingSet()) {
IAggregateWorkingSet aggregateSet = (IAggregateWorkingSet) workingSet;
if (workingSetRoot == null) workingSetRoot = aggregateSet;
IWorkingSet[] components = aggregateSet.getComponents();
for (int componentIndex = 0; componentIndex < components.length; componentIndex++) {
IAdaptable[] elements = getWorkingSetElements(components[componentIndex]);
for (int elementsIndex = 0; elementsIndex < elements.length; elementsIndex++) {
parents.put(elements[elementsIndex], components[componentIndex]);
}
parents.put(components[componentIndex], aggregateSet);
}
}
else {
IAdaptable[] elements = getWorkingSetElements(workingSet);
for (int elementsIndex = 0; elementsIndex < elements.length; elementsIndex++) {
parents.put(elements[elementsIndex], workingSet);
}
}
}
/**
*
* @param element An element from the viewer
* @return The parent associated with the element, if any.
*/
public Object getParent(Object element) {
if (element instanceof IWorkingSet && element != workingSetRoot) return workingSetRoot;
return parents.get(element);
}
}
}
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