/*******************************************************************************
 * Copyright (c) 2000, 2004 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.jdt.internal.debug.ui.launcher;

import org.eclipse.jdt.launching.IRuntimeClasspathEntry;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.widgets.Shell;

/**
 * Defines a classpath viewer to abstract between classpath viewers that are tree or table viewers.
 */
public interface IClasspathViewer extends ISelectionProvider {

	/**
	 * Returns the entries in this viewer that are the children of the parent element
	 * associated with the selected item(s)
	 * 
	 * @return the entries in this viewer
	 */
	public IRuntimeClasspathEntry[] getEntries();

	/**
	 * Sets the entries in this viewer to the given runtime classpath
	 * entries
	 * 
	 * @param entries runtime classpath entries
	 */
	public void setEntries(IRuntimeClasspathEntry[] entries);

	/**
	 * Returns the shell associated with this viewer
	 * @return a shell
	 */
	public Shell getShell();

	/**
	 * Returns whether this viewer is enabled
	 * @return whether this viewer is enabled
	 */
	public boolean isEnabled();

	/**
	 * Adds the given entries to the list. If there is no selection
	 * in the list, the entries are added at the end of the list, 
	 * otherwise the new entries are added before the (first) selected
	 * entry. The new entries are selected.
	 * 
	 * @param entries additions
	 */
	public void addEntries(IRuntimeClasspathEntry[] res);

	/**
	 * Refreshes this entry in the viewer.
	 * @param entry the entry to be refreshed
	 */
	public void refresh(Object entry);

	/**
	 * The entries in a runtime classpath entry viewer have changed in some way.
	 * Calling this method allows the viewer to adapt to those changes if necessary.
	 */
	public void notifyChanged();

	/**
	 * Returns the index of an equivalent entry, or -1 if none.
	 * 
	 * @return the index of an equivalent entry, or -1 if none
	 */
	public int indexOf(IRuntimeClasspathEntry entry);

	/**
	 * Returns whether an action of the supplied action type should be enabled based on the supplied selection.
	 * 
	 * @param actionType One of RuntimeClasspathAction constants defining the action type
	 * @param selection The selection to use for the update
	 * @return Whether the action of this type should be enabled based on the selection
	 */
	public boolean updateSelection(int actionType, IStructuredSelection selection);
}
