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/*
* Copyright 2015 tandraschko.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.primefaces.util;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.faces.component.ContextCallback;
import javax.faces.component.NamingContainer;
import javax.faces.component.UIComponent;
import javax.faces.component.UIForm;
import javax.faces.component.UniqueIdVendor;
import javax.faces.component.visit.VisitCallback;
import javax.faces.component.visit.VisitContext;
import javax.faces.component.visit.VisitResult;
import javax.faces.context.FacesContext;
public class ComponentTraversalUtils {
public static T closest(Class type, UIComponent base) {
UIComponent parent = base.getParent();
while (parent != null) {
if (type.isAssignableFrom(parent.getClass())) {
return (T) parent;
}
parent = parent.getParent();
}
return null;
}
public static T first(Class type, UIComponent base) {
T result = null;
Iterator kids = base.getFacetsAndChildren();
while (kids.hasNext() && (result == null)) {
UIComponent kid = (UIComponent) kids.next();
if (type.isAssignableFrom(kid.getClass())) {
result = (T) kid;
break;
}
result = first(type, base);
if (result != null) {
break;
}
}
return result;
}
public static ArrayList children(Class type, UIComponent base) {
ArrayList result = new ArrayList();
Iterator kids = base.getFacetsAndChildren();
while (kids.hasNext()) {
UIComponent kid = (UIComponent) kids.next();
if (type.isAssignableFrom(kid.getClass())) {
result.add((T) kid);
}
}
return result;
}
public static void withId(String id, UIComponent base, List components) {
if (id.equals(base.getId())) {
components.add(base);
}
if (base.getFacetCount() > 0) {
for (UIComponent facet : base.getFacets().values()) {
withId(id, facet, components);
}
}
if (base.getChildCount() > 0) {
for (int i = 0, childCount = base.getChildCount(); i < childCount; i++) {
UIComponent child = base.getChildren().get(i);
withId(id, child, components);
}
}
}
/**
* Finds the first component with the given id (NOT clientId!).
*
* @param id The id.
* @param base The base component to start the traversal.
* @return The component or null.
*/
public static UIComponent firstWithId(String id, UIComponent base) {
if (id.equals(base.getId())) {
return base;
}
UIComponent result = null;
Iterator kids = base.getFacetsAndChildren();
while (kids.hasNext() && (result == null)) {
UIComponent kid = (UIComponent) kids.next();
if (id.equals(kid.getId())) {
result = kid;
break;
}
result = firstWithId(id, kid);
if (result != null) {
break;
}
}
return result;
}
/**
* Finds the first component by the given id expression or client id.
*
* @param id The id.
* @param base The base component to start the traversal.
* @param separatorString The seperatorString (e.g. :).
* @param context The FacesContext.
* @return The component or null.
*/
public static UIComponent firstById(String id, UIComponent base, String separatorString, FacesContext context) {
return firstById(id, base, separatorString, context, false);
}
/**
* Finds the first component by the given id expression or client id.
*
* @param id The id.
* @param base The base component to start the traversal.
* @param separatorString The seperatorString (e.g. :).
* @param context The FacesContext.
* @param skipUnrendered Defines if unrendered components should be skipped.
* @return The component or null.
*/
public static UIComponent firstById(String id, UIComponent base, String separatorString, FacesContext context, boolean skipUnrendered) {
// try #findComponent first
UIComponent component = base.findComponent(id);
// try #invokeOnComponent
// it's required to support e.g. a full client id for a component which is placed inside UIData components
if (component == null) {
// #invokeOnComponent doesn't support the leading seperator char
String tempExpression = id;
if (tempExpression.startsWith(separatorString)) {
tempExpression = tempExpression.substring(1);
}
if (skipUnrendered)
{
VisitContext visitContext = VisitContext.createVisitContext(context, null, ComponentUtils.VISIT_HINTS_SKIP_UNRENDERED);
IdVisitCallback callback = new IdVisitCallback(tempExpression);
context.getViewRoot().visitTree(visitContext, callback);
component = callback.getComponent();
}
else
{
IdContextCallback callback = new IdContextCallback();
context.getViewRoot().invokeOnComponent(context, tempExpression, callback);
component = callback.getComponent();
}
}
return component;
}
public static UIForm closestForm(FacesContext context, UIComponent component) {
return closest(UIForm.class, component);
}
public static UniqueIdVendor closestUniqueIdVendor(UIComponent component) {
return (UniqueIdVendor) closest(UniqueIdVendor.class, component);
}
public static UIComponent closestNamingContainer(UIComponent component) {
return (UIComponent) closest(NamingContainer.class, component);
}
public static class IdVisitCallback implements VisitCallback {
private final String targetClientId;
private UIComponent component;
public IdVisitCallback(String targetClientId) {
this.targetClientId = targetClientId;
}
public VisitResult visit(VisitContext context, UIComponent target) {
if (target.getClientId().equals(targetClientId)) {
this.component = target;
return VisitResult.COMPLETE;
}
return VisitResult.ACCEPT;
}
public UIComponent getComponent() {
return component;
}
}
public static class IdContextCallback implements ContextCallback {
private UIComponent component;
public void invokeContextCallback(FacesContext context, UIComponent target) {
component = target;
}
public UIComponent getComponent() {
return component;
}
}
}
