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/*******************************************************************************
* Copyright (c) 2000, 2006 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.cdt.internal.ui.dialogs;
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.
*/
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<Object> 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;
}
}
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