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/*******************************************************************************
* 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;
}
}
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