/*******************************************************************************
 * 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.ui.internal;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IEditorReference;
import org.eclipse.ui.IPropertyListener;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.help.WorkbenchHelp;

/**
 *	Closes all editors except ones with unsaved changes.
 */
public class CloseAllSavedAction extends PageEventAction implements IPropertyListener {
	
	/**
	 * List of parts (element type: <code>IWorkbenchPart</code>)
	 * against which this class has outstanding property listeners registered.
	 */
	private List partsWithListeners = new ArrayList(1);

/**
 *	Create an instance of this class
 */
public CloseAllSavedAction(IWorkbenchWindow window) {
	super(WorkbenchMessages.getString("CloseAllSavedAction.text"), window); //$NON-NLS-1$
	setToolTipText(WorkbenchMessages.getString("CloseAllSavedAction.toolTip")); //$NON-NLS-1$
	// @issue Should create a ID in IWorkbenchActionConstants when it becames API?
	setId("closeAllSaved"); //$NON-NLS-1$
	updateState();
	WorkbenchHelp.setHelp(this, IHelpContextIds.CLOSE_ALL_SAVED_ACTION);
	setActionDefinitionId("org.eclipse.ui.file.closeAllSaved"); //$NON-NLS-1$
}
/* (non-Javadoc)
 * Method declared on PageEventAction.
 */
public void pageActivated(IWorkbenchPage page) {
	super.pageActivated(page);
	updateState();
}
/* (non-Javadoc)
 * Method declared on PageEventAction.
 */
public void pageClosed(IWorkbenchPage page) {
	super.pageClosed(page);
	updateState();
}
/* (non-Javadoc)
 * Method declared on PartEventAction.
 */
public void partClosed(IWorkbenchPart part) {
	super.partClosed(part);
	if (part instanceof IEditorPart) {
		part.removePropertyListener(this);
		partsWithListeners.remove(part);
		updateState();	
	}
}
/* (non-Javadoc)
 * Method declared on PartEventAction.
 */
public void partOpened(IWorkbenchPart part) {	
	super.partOpened(part);
	if (part instanceof IEditorPart) {
		part.addPropertyListener(this);
		partsWithListeners.add(part);
		updateState();	
	}
}
/* (non-Javadoc)
 * Method declared on IPropertyListener.
 */
public void propertyChanged(Object source, int propID) {
	if (source instanceof IEditorPart) {
		if (propID == IEditorPart.PROP_DIRTY) {
			updateState();
		}
	}
}
/* (non-Javadoc)
 * Method declared on Action.
 */
public void run() {
	if (getWorkbenchWindow() == null) {
		// action has been dispose
		return;
	}
	IWorkbenchPage page = getActivePage();
	if (page != null) {
		((WorkbenchPage) page).closeAllSavedEditors();
	}
}
/**
 * Enable the action if there at least one editor open.
 */
private void updateState() {
	IWorkbenchPage page = getActivePage();
	if (page == null) {
		setEnabled(false);
		return;
	}
	IEditorReference editors[] = page.getEditorReferences();
	for (int i = 0; i < editors.length; i++) {
		if (!editors[i].isDirty()) {
			setEnabled(true);
			return;
		}
	}
	setEnabled(false);
}
/* (non-Javadoc)
 * Method declared on PageEventAction.
 */
public void dispose() {
	super.dispose();
	for (Iterator it = partsWithListeners.iterator(); it.hasNext(); ) {
		IWorkbenchPart part = (IWorkbenchPart) it.next();
		part.removePropertyListener(this);
	}
	partsWithListeners.clear();
}

}