| /******************************************************************************* |
| * Copyright (c) 2006 Sybase, Inc. 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: |
| * Sybase, Inc. - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jst.jsf.common.ui.internal.dialogfield; |
| |
| import java.util.Collection; |
| |
| import org.eclipse.core.runtime.Assert; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.ui.dialogs.ISelectionStatusValidator; |
| |
| /** |
| * Implementation of a <code>ISelectionValidator</code> to validate the type |
| * of an element. Empty selections are not accepted. |
| * |
| * @author mengbo |
| * @version 1.5 |
| */ |
| /*package*/ 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) { |
| 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); |
| } |
| |
| 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)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |