LaunchGroupFilter.java

package net.sourceforge.c4jplugin.internal.ui.viewers;


import org.eclipse.core.runtime.CoreException;
import org.eclipse.debug.core.ILaunchConfiguration;
import org.eclipse.debug.core.ILaunchConfigurationType;
import org.eclipse.debug.ui.IDebugUIConstants;
import org.eclipse.debug.ui.ILaunchGroup;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.ui.activities.WorkbenchActivityHelper;

public class LaunchGroupFilter extends ViewerFilter {
	
	private ILaunchGroup fGroup;

	/**
	 * Constructor for ExternalToolsLaunchConfigurationFilter.
	 */
	public LaunchGroupFilter(ILaunchGroup groupExtension) {
		super();
		fGroup = groupExtension;
	}

	/**
	 * @see org.eclipse.jface.viewers.ViewerFilter#select(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
	 */
	public boolean select(
		Viewer viewer,
		Object parentElement,
		Object element) {
			ILaunchConfigurationType type = null;
			ILaunchConfiguration config = null;
			if (parentElement instanceof LaunchConfigurationTypeTreeElement) {
				type = ((LaunchConfigurationTypeTreeElement)parentElement).getLaunchConfigurationType();
			}
			if (element instanceof LaunchConfigurationTypeTreeElement) {
				type = ((LaunchConfigurationTypeTreeElement)element).getLaunchConfigurationType();
			}
			if (element instanceof LaunchConfigurationTreeElement) {
				config = ((LaunchConfigurationTreeElement)element).getLaunchConfiguration();
				try {
					type = config.getType();
				} catch (CoreException e) {
				}
			}
			boolean priv = false;
			if (config != null) {
				try {
					priv = config.getAttribute(IDebugUIConstants.ATTR_PRIVATE, false);
				} catch (CoreException e) {
				}
			}
			if (type != null) {
				return !priv && type.supportsMode(fGroup.getMode()) && equalCategories(type.getCategory(), fGroup.getCategory()) && !WorkbenchActivityHelper.filterItem(new LaunchConfigurationTypeContribution(type));
			}
			return false;
	}
	
	/**
	 * Returns whether the given categories are equal.
	 * 
	 * @param c1 category identifier or <code>null</code>
	 * @param c2 category identifier or <code>null</code>
	 * @return boolean
	 */
	private boolean equalCategories(String c1, String c2) {
		if (c1 == null || c2 == null) {
			return c1 == c2;
		}
		return c1.equals(c2);
	} 

}