/*
* Copyright 2010 Cloud.com, Inc.
*
* 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 com.cloud.bridge.util;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.util.Properties;
import org.apache.log4j.Logger;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
/**
* @author Kelven Yang
*/
public class XmlHelper {
protected static Logger logger = Logger.getLogger(XmlHelper.class);
public static Document parse(String xmlContent) throws IOException {
ByteArrayInputStream is = new ByteArrayInputStream(xmlContent.getBytes("UTF-8"));
return parse(is);
}
public static Document parse(File file) throws IOException {
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setCoalescing(true);
factory.setIgnoringComments(true);
factory.setIgnoringElementContentWhitespace(true);
factory.setNamespaceAware(true);
DocumentBuilder parser = factory.newDocumentBuilder();
return parser.parse(file);
} catch (ParserConfigurationException e) {
throw new IOException(e);
} catch (SAXException e) {
throw new IOException(e);
}
}
public static Document parse(InputStream is) throws IOException {
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setCoalescing(true);
factory.setIgnoringComments(true);
factory.setIgnoringElementContentWhitespace(true);
factory.setNamespaceAware(true);
DocumentBuilder parser = factory.newDocumentBuilder();
InputSource in = new InputSource(is);
return parser.parse(in);
} catch (ParserConfigurationException e) {
throw new IOException(e);
} catch (SAXException e) {
throw new IOException(e);
}
}
public static Document newDocument() {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
DocumentBuilder builder;
try {
builder = dbf.newDocumentBuilder();
Document document = builder.newDocument();
return document;
} catch (ParserConfigurationException e) {
logger.error("Unexpected exception " + e.getMessage(), e);
}
return null;
}
public static Node getRootNode(Document doc) {
NodeList l = doc.getChildNodes();
if(l != null && l.getLength() == 1)
return l.item(0);
return null;
}
public static Node getChildNode(Node parentNode, String childElementName) {
NodeList l = parentNode.getChildNodes();
for(int i = 0; i < l.getLength(); i++) {
Node node = l.item(i);
if(node.getNodeName().equals(childElementName))
return node;
}
return null;
}
public static String getChildNodeTextContent(Node parentNode, String childElementName) {
Node node = getChildNode(parentNode, childElementName);
if(node != null)
return node.getTextContent();
return null;
}
public static String getAttribute(Node node, String name) {
NamedNodeMap attributes = node.getAttributes();
Node attrNode = attributes.getNamedItem(name);
if(attrNode != null)
return attrNode.getNodeValue();
return null;
}
public static String toXML(Node node) {
if (node != null) {
Transformer transformer = newTransformer();
try {
StringWriter sw = new StringWriter();
transformer.transform(new DOMSource(node), new StreamResult(sw));
return sw.toString();
} catch (TransformerException e) {
logger.error("Unexpected exception " + e.getMessage(), e);
}
}
return StringHelper.EMPTY_STRING;
}
public static Transformer newTransformer() {
return newTransformer("UTF-8", false);
}
public static Transformer newTransformer(String encoding, boolean indent) {
try {
Transformer transformer = TransformerFactory.newInstance()
.newTransformer();
Properties properties = transformer.getOutputProperties();
properties.setProperty(OutputKeys.ENCODING, encoding);
properties.setProperty(OutputKeys.METHOD, "XML");
properties.setProperty(OutputKeys.VERSION, "1.0");
if(indent)
properties.setProperty(OutputKeys.INDENT, "YES");
else
properties.setProperty(OutputKeys.INDENT, "NO");
transformer.setOutputProperties(properties);
return transformer;
} catch (TransformerConfigurationException e) {
logger.error("Unexpected exception " + e.getMessage(), e);
}
return null;
}
}