org.thymeleaf.util.FragmentUtils Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of thymeleaf Show documentation

Modern server-side Java template engine for both web and standalone environments

There is a newer version: 3.1.3.RELEASE

/*
 * =============================================================================
 * 
 *   Copyright (c) 2011, The THYMELEAF team (http://www.thymeleaf.org)
 * 
 *   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.thymeleaf.util;

import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * 
 * @author Daniel Fernández
 * 
 * @since 1.0
 *
 */
public final class FragmentUtils {
    
    
    
    public static Node extractFragmentByAttributevalue(final Document document, final String attributeName, final String attributeValue) {

        Validate.notNull(document, "Document cannot be null");
        Validate.notNull(attributeName, "Attribute name cannot be null");
        Validate.notNull(attributeValue, "Attribute value cannot be null");
        
        return processNode(document.getDocumentElement(), attributeName, attributeValue);
        
    }
    
    
    private static Node processNode(final Node node, final String attributeName, final String attributeValue) {
        
        if (!(node instanceof Element)) {
            return null;
        }
        
        final Element element = (Element) node;
        final Attr attribute = element.getAttributeNode(attributeName);
        if (attribute != null) {
            final String currentAttributeValue = attribute.getValue();
            if (currentAttributeValue != null && currentAttributeValue.trim().equals(attributeValue)) {
                return node;
            }
        }
        
        final NodeList children = element.getChildNodes();
        for (int i = 0; i < children.getLength(); i++) {
            final Node childResult = processNode(children.item(i), attributeName, attributeValue);
            if (childResult != null) {
                return childResult;
            }
        }
        
        return null;
        
    }

    
    
    
    
    private FragmentUtils() {
        super();
    }
    
}