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/*******************************************************************************
* Copyright (c) 2011 Google, Inc.
* 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:
* Google, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.wb.internal.core.model.property.category;
import org.eclipse.wb.internal.core.model.property.Property;
import org.eclipse.wb.internal.core.model.property.PropertyManager;
/**
* Factory for {@link PropertyCategoryProvider} instances.
*
* @author scheglov_ke
* @coverage core.model.property
*/
public final class PropertyCategoryProviders {
////////////////////////////////////////////////////////////////////////////
//
// Simple providers
//
////////////////////////////////////////////////////////////////////////////
private static final PropertyCategoryProvider FROM_PROPERTY = new PropertyCategoryProvider() {
public PropertyCategory getCategory(Property property) {
return property.getCategory();
}
};
/**
* Returns result of {@link Property#getCategory()}, never <code>null</code>.
*/
public static PropertyCategoryProvider fromProperty() {
return FROM_PROPERTY;
}
private static final PropertyCategoryProvider FORCED_BY_USER = new PropertyCategoryProvider() {
public PropertyCategory getCategory(Property property) {
return PropertyManager.getCategoryForced(property);
}
};
/**
* Returns category forced by user, may be <code>null</code>.
*/
public static PropertyCategoryProvider forcedByUser() {
return FORCED_BY_USER;
}
////////////////////////////////////////////////////////////////////////////
//
// Compound
//
////////////////////////////////////////////////////////////////////////////
/**
* Returns first not <code>null</code> category returned by provider.
*/
public static PropertyCategoryProvider combine(final PropertyCategoryProvider... providers) {
return new PropertyCategoryProvider() {
public PropertyCategory getCategory(Property property) {
for (PropertyCategoryProvider provider : providers) {
PropertyCategory category = provider.getCategory(property);
if (category != null) {
return category;
}
}
throw new IllegalStateException("Can not provide category for " + property.getTitle());
}
};
}
private static final PropertyCategoryProvider DEF = combine(forcedByUser(), fromProperty());
/**
* Returns the default combination of {@link PropertyCategoryProvider}s - first
* {@link #forcedByUser()}, then {@link #fromProperty()}.
*/
public static PropertyCategoryProvider def() {
return DEF;
}
}
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