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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.team.internal.ccvs.ui.model;
import org.eclipse.jface.viewers.AbstractTreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.team.internal.ccvs.core.ICVSRemoteFolder;
import org.eclipse.team.internal.ccvs.core.ICVSRemoteResource;
import org.eclipse.team.internal.ccvs.core.ICVSRepositoryLocation;
import org.eclipse.team.internal.ccvs.core.ICVSResource;
import org.eclipse.team.internal.ccvs.core.resources.RemoteResource;
import org.eclipse.team.internal.ccvs.ui.CVSUIPlugin;
import org.eclipse.team.internal.ccvs.ui.ICVSUIConstants;
import org.eclipse.team.internal.ccvs.ui.repo.RepositoryRoot;
import org.eclipse.ui.IWorkingSet;
import org.eclipse.ui.model.WorkbenchContentProvider;
import org.eclipse.ui.progress.DeferredTreeContentManager;
/**
* Extension to the generic workbench content provider mechanism
* to lazily determine whether an element has children. That is,
* children for an element aren't fetched until the user clicks
* on the tree expansion box.
*/
public class RemoteContentProvider extends WorkbenchContentProvider {
IWorkingSet workingSet;
DeferredTreeContentManager manager;
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
*/
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
if (viewer instanceof AbstractTreeViewer) {
if(CVSUIPlugin.getPlugin().getPreferenceStore().getBoolean(ICVSUIConstants.BACKGROUND_REPOVIEW)) {
manager = new DeferredTreeContentManager(this, (AbstractTreeViewer) viewer);
}
}
super.inputChanged(viewer, oldInput, newInput);
}
public boolean hasChildren(Object element) {
// the + box will always appear, but then disappear
// if not needed after you first click on it.
if (element instanceof ICVSRemoteResource) {
if (element instanceof ICVSRemoteFolder) {
return ((ICVSRemoteFolder) element).isExpandable();
}
return ((ICVSRemoteResource) element).isContainer();
} else if (element instanceof CVSResourceElement) {
ICVSResource r = ((CVSResourceElement) element).getCVSResource();
if (r instanceof RemoteResource) {
return r.isFolder();
}
} else if (element instanceof VersionCategory) {
return true;
} else if (element instanceof BranchCategory) {
return true;
} else if (element instanceof ModulesCategory) {
return true;
} else if (element instanceof CVSTagElement) {
return true;
} else if (element instanceof RemoteModule) {
return true;
}
if (manager != null) {
if (manager.isDeferredAdapter(element))
return manager.mayHaveChildren(element);
}
return super.hasChildren(element);
}
/**
* Sets the workingSet.
* @param workingSet The workingSet to set
*/
public void setWorkingSet(IWorkingSet workingSet) {
this.workingSet = workingSet;
}
/**
* Returns the workingSet.
* @return IWorkingSet
*/
public IWorkingSet getWorkingSet() {
return workingSet;
}
/* (non-Javadoc)
* @see org.eclipse.ui.model.WorkbenchContentProvider#getChildren(java.lang.Object)
*/
public Object[] getChildren(Object element) {
if (manager != null) {
Object[] children = manager.getChildren(element);
if (children != null) {
// This will be a placeholder to indicate
// that the real children are being fetched
return children;
}
}
Object[] children = super.getChildren(element);
for (int i = 0; i < children.length; i++) {
Object object = children[i];
if (object instanceof CVSModelElement)
((CVSModelElement)object).setWorkingSet(getWorkingSet());
}
return children;
}
public void cancelJobs(RepositoryRoot[] roots) {
if (manager != null) {
for (int i = 0; i < roots.length; i++) {
RepositoryRoot root = roots[i];
cancelJobs(root.getRoot());
}
}
}
/**
* Cancel any jobs that are fetching content from the given location.
* @param location
*/
public void cancelJobs(ICVSRepositoryLocation location) {
if (manager != null) {
manager.cancel(location);
}
}
}
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