Find the first UIMessages instance in the given JSF component tree. - Java JSF

Java examples for JSF:UIComponent

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Description

Find the first UIMessages instance in the given JSF component tree.

Demo Code

/*/*from  w  w w  .  jav  a 2  s.co  m*/
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.component.UIForm;
import javax.faces.component.UIInput;
import javax.faces.component.UIMessages;
import java.util.ArrayList;
import java.util.List;

public class Main{
    /**
     * Find the first UIMessages instance in the given component tree.
     *
     * @param component The component tree to search in.
     * @return The first UIMessages instance, or <code>null</code> if nothing is found.
     */
    static UIMessages findMessagesInTree(final UIComponent component) {
        final List<UIComponent> children = component.getChildren();
        for (final UIComponent child : children) {
            if (child instanceof UIMessages) {
                return (UIMessages) child;
            } else {
                final UIMessages messages = findMessagesInTree(child);
                if (messages != null) {
                    return messages;
                }
            }
        }
        return null;
    }
}

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