AbstractContentProvider.java

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package edu.rice.cs.hpc.viewer.scope;

import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;

import edu.rice.cs.hpc.data.experiment.scope.Scope;

public abstract class AbstractContentProvider implements ITreeContentProvider 
{
    protected ScopeTreeViewer viewer;
    protected boolean enableFilter = false;
    
    public void setEnableFilter(boolean isFilterEnabled)
    {
        this.enableFilter = isFilterEnabled;
    }
    
    public Object[] getElements(Object inputElement) {
            return getChildren(inputElement);
    }

    public Object[] getChildren(Object parentElement) {
        if(parentElement instanceof Scope) {
            // normal mode
            Scope parent = ((Scope) parentElement);
            Object arrChildren[] = parent.getChildren();
            // if the database has empty data, the children is null
            if (arrChildren != null && arrChildren.length>0)
            {
                return arrChildren;
            }
        }
        return null;
    }
    

    /*
     * (non-Javadoc)
     * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
     */
    public Object getParent(Object element) {
        if(element instanceof Scope)
            return ((Scope) element).getParent();
        else
            return null;
    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
     */
    public boolean hasChildren(Object element) {
        if(element instanceof Scope)
            return ((Scope) element).hasChildren(); // !((Scope.Node) element).isLeaf();
        else
            return false;
    }

    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
        if (viewer instanceof ScopeTreeViewer)
            this.viewer = (ScopeTreeViewer)viewer;
    }
 
    /*
     * (non-Javadoc)
     * @see org.eclipse.jface.viewers.IContentProvider#dispose()
     */
    public void dispose() {}
}