/*
* JBoss, Home of Professional Open Source
* Copyright 2013, Red Hat, Inc. and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.richfaces.component;
import com.google.common.base.Predicate;
import com.google.common.collect.AbstractIterator;
import com.google.common.collect.Iterators;
import javax.faces.component.UIComponent;
import java.util.Iterator;
/**
* @author Nick Belaevski
*
*/
public final class ComponentIterators {
private ComponentIterators() {
}
// TODO nick - convert to filter/find functions
public static Iterator<UIComponent> parents(final UIComponent component) {
if (component == null) {
return Iterators.<UIComponent>emptyIterator();
}
return new AbstractIterator<UIComponent>() {
private UIComponent currentComponent = component;
@Override
protected UIComponent computeNext() {
currentComponent = currentComponent.getParent();
if (currentComponent == null) {
endOfData();
}
return currentComponent;
}
};
}
public static Iterator<UIComponent> parentsAndSelf(final UIComponent component) {
if (component == null) {
return Iterators.<UIComponent>emptyIterator();
}
return Iterators.concat(Iterators.singletonIterator(component), parents(component));
}
public static UIComponent getParent(UIComponent component, Predicate<UIComponent> predicat) {
if (component == null || predicat == null) {
return null;
}
UIComponent parent = component.getParent();
while (parent != null) {
if (predicat.apply(parent)) {
return parent;
}
parent = parent.getParent();
}
return null;
}
/**
* Finds a parent of given UI <code>component</code>.
*
* @param component <code>UIComponent</code>
* @param parentClass <code>Class</code> of desired parent
* @return <code>UIComponent</code>
*/
public static <T extends UIComponent> T getParent(UIComponent component, Class<T> parentClass) {
if (component == null || parentClass == null) {
return null;
}
UIComponent parent = component.getParent();
while (parent != null) {
if (parentClass.isInstance(parent)) {
return (T) parent;
}
parent = parent.getParent();
}
return null;
}
}