org.snaker.engine.helper.XmlHelper Maven / Gradle / Ivy
/* Copyright 2012-2013 the original author or authors.
*
* 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.snaker.engine.helper;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
* xml解析的帮助类
* @author yuqs
* @version 1.0
*/
public class XmlHelper {
/**
* DocumentBuilderFactory实例
*/
private static DocumentBuilderFactory documentBuilderFactory = createDocumentBuilderFactory();
/**
* 获取DocumentBuilderFactory
* @return
*/
private static DocumentBuilderFactory createDocumentBuilderFactory() {
return DocumentBuilderFactory.newInstance();
}
/**
* 由DocumentBuilderFactory产生DocumentBuilder实例
* @return
*/
public static DocumentBuilder createDocumentBuilder() {
try {
return documentBuilderFactory.newDocumentBuilder();
} catch (ParserConfigurationException e) {
return null;
}
}
/**
* 从element元素查找所有tagName指定的子节点元素集合
* @param element
* @param tagName
* @return
*/
public static List elements(Element element, String tagName) {
if (element == null || !element.hasChildNodes()) {
return Collections.emptyList();
}
List elements = new ArrayList();
for (Node child = element.getFirstChild(); child != null; child = child.getNextSibling()) {
if (child.getNodeType() == Node.ELEMENT_NODE) {
Element childElement = (Element) child;
String childTagName = childElement.getNodeName();
if (tagName.equals(childTagName))
elements.add(childElement);
}
}
return elements;
}
}