| /******************************************************************************* |
| * Copyright (c) 2000, 2017 IBM Corporation and others. |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0. |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| *******************************************************************************/ |
| package org.eclipse.dltk.internal.ui.wizards; |
| |
| import java.util.Collection; |
| |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.dltk.ui.dialogs.StatusInfo; |
| import org.eclipse.ui.dialogs.ISelectionStatusValidator; |
| |
| /** |
| * Implementation of a <code>ISelectionValidator</code> to validate the |
| * type of an element. |
| * Empty selections are not accepted. |
| */ |
| public class TypedElementSelectionValidator implements ISelectionStatusValidator { |
| |
| private IStatus fgErrorStatus= new StatusInfo(IStatus.ERROR, ""); //$NON-NLS-1$ |
| private IStatus fgOKStatus= new StatusInfo(); |
| |
| 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) { |
| org.eclipse.core.runtime.Assert.isNotNull(acceptedTypes); |
| fAcceptedTypes= acceptedTypes; |
| fAllowMultipleSelection= allowMultipleSelection; |
| fRejectedElements= rejectedElements; |
| } |
| |
| @Override |
| 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; |
| } |
| } |