| /******************************************************************************* |
| * Copyright (c) 2005 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.jem.internal.beaninfo.ui; |
| |
| import java.util.Collection; |
| |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Assert; |
| import org.eclipse.ui.dialogs.ISelectionStatusValidator; |
| |
| |
| public class TypedElementSelectionValidator implements ISelectionStatusValidator { |
| |
| private IStatus fgErrorStatus= StatusHelper.ERROR_STATUS; |
| private IStatus fgOKStatus= StatusHelper.OK_STATUS; |
| |
| private Class[] fAcceptedTypes; |
| private boolean fAllowMultipleSelection; |
| private Collection fRejectedElements; |
| |
| /** |
| * @param acceptedTypes The types accepted by the validator |
| * @param allowMultipleSelection If set to <code>true</code>, the validator |
| * allows multiple selection. |
| */ |
| public TypedElementSelectionValidator(Class[] acceptedTypes, boolean allowMultipleSelection) { |
| this(acceptedTypes, allowMultipleSelection, null); |
| } |
| |
| /** |
| * @param acceptedTypes The types accepted by the validator |
| * @param allowMultipleSelection If set to <code>true</code>, the validator |
| * allows multiple selection. |
| * @param rejectedElements A list of elements that are not accepted |
| */ |
| public TypedElementSelectionValidator(Class[] acceptedTypes, boolean allowMultipleSelection, Collection rejectedElements) { |
| Assert.isNotNull(acceptedTypes); |
| fAcceptedTypes= acceptedTypes; |
| fAllowMultipleSelection= allowMultipleSelection; |
| fRejectedElements= rejectedElements; |
| } |
| |
| /* |
| * @see org.eclipse.ui.dialogs.ISelectionValidator#isValid(java.lang.Object) |
| */ |
| public IStatus validate(Object[] elements) { |
| if (isValid(elements)) { |
| return fgOKStatus; |
| } |
| return fgErrorStatus; |
| } |
| |
| private boolean isOfAcceptedType(Object o) { |
| for (int i= 0; i < fAcceptedTypes.length; i++) { |
| if (fAcceptedTypes[i].isInstance(o)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private boolean isRejectedElement(Object elem) { |
| return (fRejectedElements != null) && fRejectedElements.contains(elem); |
| } |
| |
| protected boolean isSelectedValid(Object elem) { |
| return true; |
| } |
| |
| private boolean isValid(Object[] selection) { |
| if (selection.length == 0) { |
| return false; |
| } |
| |
| if (!fAllowMultipleSelection && selection.length != 1) { |
| return false; |
| } |
| |
| for (int i= 0; i < selection.length; i++) { |
| Object o= selection[i]; |
| if (!isOfAcceptedType(o) || isRejectedElement(o) || !isSelectedValid(o)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |