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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.editor.structure.property;
import com.google.common.collect.Lists;
import org.eclipse.wb.internal.core.model.property.Property;
import org.eclipse.wb.internal.core.model.property.PropertyManager;
import java.util.Iterator;
import java.util.List;
/**
* Helper for computing intersection of {@link Property} arrays.
*
* @author scheglov_ke
* @coverage core.editor.structure
*/
public final class PropertyListIntersector {
private List<PropertyGroup> m_intersection;
////////////////////////////////////////////////////////////////////////////
//
// Access
//
////////////////////////////////////////////////////////////////////////////
/**
* Updates intersection by intersecting with new given array.
*/
public void intersect(Property[] properties) {
if (m_intersection == null) {
m_intersection = Lists.newArrayList();
for (int i = 0; i < properties.length; i++) {
Property property = properties[i];
m_intersection.add(new PropertyGroup(property));
}
} else {
for (Iterator<PropertyGroup> I = m_intersection.iterator(); I.hasNext();) {
PropertyGroup propertyGroup = I.next();
if (!propertyGroup.add(properties)) {
I.remove();
}
}
}
}
/**
* @return the array of matched composite {@link Property}'s.
*/
public Property[] getProperties() {
List<Property> properties = Lists.newArrayList();
for (PropertyGroup propertyGroup : m_intersection) {
Property compositeProperty = propertyGroup.getCompositeProperty();
if (compositeProperty != null) {
properties.add(compositeProperty);
}
}
//
return properties.toArray(new Property[properties.size()]);
}
////////////////////////////////////////////////////////////////////////////
//
// PropertyGroup
//
////////////////////////////////////////////////////////////////////////////
/**
* The group of {@link Property}'s that match.
*/
private static final class PropertyGroup {
private final List<Property> m_properties = Lists.newArrayList();
////////////////////////////////////////////////////////////////////////////
//
// Constructor
//
////////////////////////////////////////////////////////////////////////////
public PropertyGroup(Property property) {
m_properties.add(property);
}
////////////////////////////////////////////////////////////////////////////
//
// Access
//
////////////////////////////////////////////////////////////////////////////
/**
* @return <code>true</code> if new matched {@link Property} from given array was added.
*/
public boolean add(Property[] properties) {
for (Property property : properties) {
if (add(property)) {
return true;
}
}
// no match
return false;
}
/**
* @return the composite {@link Property} for this group.
*/
public Property getCompositeProperty() {
Property properties[] = m_properties.toArray(new Property[m_properties.size()]);
return properties[0].getComposite(properties);
}
////////////////////////////////////////////////////////////////////////////
//
// Internal
//
////////////////////////////////////////////////////////////////////////////
/**
* @return <code>true</code> if given {@link Property} matches and was added.
*/
private boolean add(Property property) {
Property example = m_properties.get(0);
if (example.getClass() == property.getClass()
&& example.getTitle().equals(property.getTitle())
&& PropertyManager.getCategory(example) == PropertyManager.getCategory(property)) {
m_properties.add(property);
return true;
}
// no match
return false;
}
}
}
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