/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui;

import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.dialogs.IWorkingSetEditWizard;
import org.eclipse.ui.dialogs.IWorkingSetNewWizard;
import org.eclipse.ui.dialogs.IWorkingSetSelectionDialog;

/**
 * A working set manager stores working sets and provides property 
 * change notification when a working set is added or removed.
 * <p>
 * The workbench working set manager can be accessed using 
 * <code>IWorkbench#getWorkingSetManager()</code>
 * </p>
 * <p>
 * This interface is not intended to be implemented by clients.
 * </p>
 * 
 * @see IWorkingSet
 * @since 1.1
 * @noimplement This interface is not intended to be implemented by clients.
 */
public interface IWorkingSetManager {

    /**
     * Change event id when a working set is added
     * newValue of the PropertyChangeEvent will be the added working set.
     * oldValue will be null.
     *
     * @see IPropertyChangeListener
     */
    public static final String CHANGE_WORKING_SET_ADD = "workingSetAdd"; //$NON-NLS-1$

    /**
     * Change event id when a working set is removed
     * newValue of the PropertyChangeEvent will be null.
     * oldValue will be the removed working set.
     *
     * @see IPropertyChangeListener
     */
    public static final String CHANGE_WORKING_SET_REMOVE = "workingSetRemove"; //$NON-NLS-1$

    /**
     * Change event id when the working set contents changed
     * newValue of the PropertyChangeEvent will be the changed working set.
     * oldValue will be null.
     *
     * @see IPropertyChangeListener
     */
    public static final String CHANGE_WORKING_SET_CONTENT_CHANGE = "workingSetContentChange"; //$NON-NLS-1$

    /**
     * Change event id when the working set name changed.
     * newValue of the PropertyChangeEvent will be the changed working set.
     * oldValue will be null.
     *
     * @see IPropertyChangeListener
     */
    public static final String CHANGE_WORKING_SET_NAME_CHANGE = "workingSetNameChange"; //$NON-NLS-1$	
    
    /**
     * Change event id when the working set label changed.
     * newValue of the PropertyChangeEvent will be the changed working set.
     * oldValue will be null.
     *
     * @see IPropertyChangeListener
     */
    public static final String CHANGE_WORKING_SET_LABEL_CHANGE = "workingSetLabelChange"; //$NON-NLS-1$	
    
    /**
     * Change event id when a working set updater got installed.
     * NewValue of the PropertyChangeEvent will be the installed updater.
     * OldValue will be <code>null</code>
     */
    public static final String CHANGE_WORKING_SET_UPDATER_INSTALLED = "workingSetUpdaterInstalled"; //$NON-NLS-1$
    
    /**
     * Change event id when a working set updater got uninstalled.
     * NewValue will be <code>null</code>
     * OldValue of the PropertyChangeEvent will be the uninstalled updater.
     */
    public static final String CHANGE_WORKING_SET_UPDATER_UNINSTALLED = "workingSetUpdaterUninstalled"; //$NON-NLS-1$

    /**
     * Adds a property change listener.
     * 
     * @param listener the property change listener to add
     */
    public void addPropertyChangeListener(IPropertyChangeListener listener);

    /**
     * Adds a working set to the top of the list of most recently used 
     * working sets, making it the most recently used working set.
     * The last (oldest) item will be deleted if the list exceeds the 
     * size limit.
     * 
     * @param workingSet the working set to add to the list of most 
     * 	recently used working sets.
     */
    public void addRecentWorkingSet(IWorkingSet workingSet);

    /**
     * Adds a working set to the receiver. The working set must 
     * not exist yet.
     * 
     * @param workingSet the working set to add
     */
    public void addWorkingSet(IWorkingSet workingSet);

    /**
     * Creates a new working set.
     * The working set is not added to the working set manager.
     * 
     * @param name the name of the new working set. Should not have 
     * 	leading or trailing whitespace.
     * @param elements the working set contents
     * @return a new working set with the specified name and content
     */
    public IWorkingSet createWorkingSet(String name, IAdaptable[] elements);
    
    /**
	 * Create a working set that is the union of a collection of other working
	 * sets. One connected (via
	 * {@link IWorkingSetManager#addWorkingSet(IWorkingSet)} this working set
	 * will be automatically updated to reflect the contents of the component
	 * sets, should they themselves change.
	 * 
	 * @param name
	 *            the name of the new working set. Should not have leading or
	 *            trailing whitespace.
	 * @param label
	 *            the user-friendly label the working set
	 * @param components
	 *            the component working sets
	 * @return a new working set with the specified name and content
	 */
	public IWorkingSet createAggregateWorkingSet(String name, String label,
			IWorkingSet[] components);

    /**
     * Re-creates and returns a working set from the state captured within the 
     * given memento. 
     *
     * @param memento a memento containing the state for the working set
     * @return the restored working set, or <code>null</code> if it could not be created
     */
    public IWorkingSet createWorkingSet(IMemento memento);

    /**
     * Creates a working set edit wizard for the specified working set.
     * The working set will already be set in the wizard.
     * The caller is responsible for creating and opening a wizard dialog.
     *
     * Example:
     * <code>
     *  IWorkingSetEditWizard wizard = workingSetManager.createWorkingSetEditWizard(workingSet);
     *  if (wizard != null) {
     *	  WizardDialog dialog = new WizardDialog(shell, wizard);
     *
     *	  dialog.create();		
     *	  if (dialog.open() == Window.OK) {		
     *		  workingSet = wizard.getSelection();
     *    }
     *	}
     * </code>
     * 
     * @param workingSet working set to create a working set edit wizard 
     * 	for.
     * @return a working set edit wizard to edit the specified working set
     *  or <code>null</code> if no edit wizard has been defined for the
     *  working set. If the defined edit wizard for the working set could 
     *  not be loaded a default IResource based wizard will be returned. 
     * 	If the default edit wizard can not be loaded <code>null</code> is 
     *  returned.
     */
    public IWorkingSetEditWizard createWorkingSetEditWizard(
            IWorkingSet workingSet);
    

    /**
     * Creates a working set new wizard. The wizard will allow creating new
     * working sets. Returns <code>null</code> if there aren't any working set
     * definitions that support creation of working sets.
     * <p>
     * Example:
     * <code>
     *   IWorkingSetNewWizard wizard= workingSetManager.createWorkingSetNewWizard(null);
     *   if (wizard != null) {  
     *	     WizardDialog dialog = new WizardDialog(shell, wizard);
     *
     *	     dialog.create();		
     *	     if (dialog.open() == Window.OK) {		
     *		    ...
     *       }
     *   }
     * </code>
     * </p>
     * 
     * @param workingSetIds a list of working set ids which are valid workings sets
     *  to be created or <code>null</code> if all currently available working set types
     *  are valid
     * 
     * @return the working set new wizard or <code>null</code>
     */
    public IWorkingSetNewWizard createWorkingSetNewWizard(String[] workingSetIds);
    
    /**
     * @param parent the parent shell
     * @return the dialog
     * @deprecated use createWorkingSetSelectionDialog(parent, true) instead
     */
    public IWorkingSetSelectionDialog createWorkingSetSelectionDialog(
            Shell parent);

    /**
     * Creates a working set selection dialog that lists all working 
     * sets and allows the user to add, remove and edit working sets.
     * The caller is responsible for opening the dialog with 
     * <code>IWorkingSetSelectionDialog#open</code>, and subsequently 
     * extracting the selected working sets using 
     * <code>IWorkingSetSelectionDialog#getSelection</code>.
     * 
     * @param parentShell the parent shell of the working set selection dialog
     * @param multi true= <code>IWorkingSetSelectionDialog#getSelection()</code> 
     *  returns the working sets chosen in the dialog as an array of working set.
     *  false= <code>IWorkingSetSelectionDialog#getSelection()</code> returns
     *  an array having a single aggregate working set of all working sets 
     *  selected in the dialog.
     * @return a working set selection dialog
     */
    public IWorkingSetSelectionDialog createWorkingSetSelectionDialog(
            Shell parentShell, boolean multi);

    /**
     * Creates a working set selection dialog that lists all working 
     * sets with the specified ids and allows the user to add, remove and
     * edit working sets with the specified ids.
     * The caller is responsible for opening the dialog with 
     * <code>IWorkingSetSelectionDialog#open</code>, and subsequently 
     * extracting the selected working sets using 
     * <code>IWorkingSetSelectionDialog#getSelection</code>.
     * 
     * @param parentShell the parent shell of the working set selection dialog
     * @param multi true= <code>IWorkingSetSelectionDialog#getSelection()</code> 
     *  returns the working sets chosen in the dialog as an array of working set.
     *  false= <code>IWorkingSetSelectionDialog#getSelection()</code> returns
     *  an array having a single aggregate working set of all working sets 
     *  selected in the dialog.
     * @param workingsSetIds a list of working set ids which are valid workings sets
     *  to be selected, created, removed or edited, or <code>null</code> if all currently
     *  available working set types are valid 
     * @return a working set selection dialog
     */
    public IWorkingSetSelectionDialog createWorkingSetSelectionDialog(
            Shell parentShell, boolean multi, String[] workingsSetIds);
    
    /**
     * Returns the list of most recently used working sets.
     * The most recently used working set appears first in the list.
     * 
     * @return the list of most recently used working sets
     */
    public IWorkingSet[] getRecentWorkingSets();

    /**
     * Returns the working set with the specified name.
     * Returns null if there is no working set with that name.
     * 
     * @param name the name of the working set to return
     * @return the working set with the specified name.
     */
    public IWorkingSet getWorkingSet(String name);

    /**
	 * Returns an array of all working sets stored in the receiver. Any working
	 * set whose {@link IWorkingSet#isVisible()} method returns false will not be
	 * included in this array. For a complete list of working sets please use
	 * {@link #getAllWorkingSets()}.
	 * 
	 * @return the working sets stored in the receiver
	 */
    public IWorkingSet[] getWorkingSets();
    
    /**
	 * Returns an array of all working sets stored in the receiver including
	 * those that are marked as being not visible.
	 * 
	 * @see IWorkingSet#isVisible()
	 * @return the working sets stored in the receiver
	 */
    public IWorkingSet[] getAllWorkingSets();

    /**
     * Removes the property change listener.
     * 
     * @param listener the property change listener to remove
     */
    public void removePropertyChangeListener(IPropertyChangeListener listener);

    /**
     * Removes the working set
     * 
     * @param workingSet the working set to remove
     */
    public void removeWorkingSet(IWorkingSet workingSet);
    
    /**
     * Disposes the working set manager.
     */
    public void dispose();
    
    /**
	 * Utility method that will add the <code>element</code> to each given
	 * working set in <code>workingSets</code> if possible. This method will
	 * invoke {@link IWorkingSet#adaptElements(IAdaptable[])} for the element on
	 * each working set and the result of this method will be used rather than
	 * the original element in the addition operation.
	 * 
	 * @param element
	 *            the element to adapt and then add to the working sets
	 * @param workingSets
	 *            the working sets to add the element to
	 */
	public void addToWorkingSets(IAdaptable element, IWorkingSet[] workingSets);
}