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package com.taobao.api.internal.util;
import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import com.taobao.api.ApiException;
/**
* Encapsulating XML common operations.
*
* @author fengsheng
* @since 1.0, Jun 12, 2007
* @version 2.0 Jun 23, 2011
* @version 2.1 Jan 11, 2013
*/
public final class XmlUtils {
private static final Log log = LogFactory.getLog(XmlUtils.class);
private static final String XMLNS_XSI = "xmlns:xsi";
private static final String XSI_SCHEMA_LOCATION = "xsi:schemaLocation";
private static final String LOGIC_YES = "yes";
private static final String DEFAULT_CHARSET = "UTF-8";
/**
* Creates a new document instance.
*
* @return a new document instance
* @throws ApiException problem creating a new document
*/
public static Document newDocument() throws ApiException {
Document doc = null;
try {
doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
} catch (ParserConfigurationException e) {
throw new ApiException(e);
}
return doc;
}
/**
* Parses the content of the given XML file as an XML document.
*
* @param file the XML file instance
* @return the document instance representing the entire XML document
* @throws ApiException problem parsing the XML file
*/
public static Document getDocument(File file) throws ApiException {
InputStream in = getInputStream(file);
return getDocument(new InputSource(in), null);
}
/**
* Parses the content of the given stream as an XML document.
*
* @param xml the XML file input stream
* @return the document instance representing the entire XML document
* @throws ApiException problem parsing the XML input stream
*/
public static Document getDocument(InputSource xml, InputStream xsd) throws ApiException {
Document doc = null;
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
if (xsd != null) {
dbf.setNamespaceAware(true);
}
DocumentBuilder builder = dbf.newDocumentBuilder();
doc = builder.parse(xml);
if (xsd != null) {
validateXml(doc, xsd);
}
} catch (ParserConfigurationException e) {
throw new ApiException(e);
} catch (SAXException e) {
throw new ApiException("XML_PARSE_ERROR", e);
} catch (IOException e) {
throw new ApiException("XML_READ_ERROR", e);
} finally {
closeStream(xml.getByteStream());
}
return doc;
}
/**
* Creates a root element as well as a new document with specific tag name.
*
* @param tagName the name of the root element
* @return a new element instance
* @throws ApiException problem generating a new document
*/
public static Element createRootElement(String tagName) throws ApiException {
Document doc = newDocument();
Element root = doc.createElement(tagName);
doc.appendChild(root);
return root;
}
/**
* Gets the root element from input stream.
*
* @param xml the XML file input stream
* @return the root element of parsed document
* @throws ApiException problem parsing the XML file input stream
*/
public static Element getRootElementFromStream(InputStream xml) throws ApiException {
return getDocument(new InputSource(xml), null).getDocumentElement();
}
/**
* Gets the root element from input stream.
*
* @param xml the XML file input stream
* @return the root element of parsed document
* @throws ApiException problem parsing the XML file input stream
*/
public static Element getRootElementFromStream(InputStream xml, InputStream xsd) throws ApiException {
return getDocument(new InputSource(xml), xsd).getDocumentElement();
}
/**
* Gets the root element from given XML file.
*
* @param xml the name of the XML file
* @return the root element of parsed document
* @throws ApiException problem parsing the XML file
*/
public static Element getRootElementFromFile(File xml) throws ApiException {
return getDocument(xml).getDocumentElement();
}
/**
* Gets the root element from the given XML payload.
*
* @param payload the XML payload representing the XML file.
* @return the root element of parsed document
* @throws ApiException problem parsing the XML payload
*/
public static Element getRootElementFromString(String payload) throws ApiException {
if (payload == null || payload.length() < 1) {
throw new ApiException("XML_PAYLOAD_EMPTY");
}
StringReader sr = new StringReader(escapeXml(payload));
InputSource source = new InputSource(sr);
return getDocument(source, null).getDocumentElement();
}
/**
* Gets the descendant elements list from the parent element.
*
* @param parent the parent element in the element tree
* @param tagName the specified tag name
* @return the NOT NULL descendant elements list
*/
public static List getElements(Element parent, String tagName) {
NodeList nodes = parent.getElementsByTagName(tagName);
List elements = new ArrayList();
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
if (node instanceof Element) {
elements.add((Element) node);
}
}
return elements;
}
/**
* Gets the immediately descendant element from the parent element.
*
* @param parent the parent element in the element tree
* @param tagName the specified tag name.
* @return immediately descendant element of parent element, NULL otherwise.
*/
public static Element getElement(Element parent, String tagName) {
List children = getElements(parent, tagName);
if (children.isEmpty()) {
return null;
} else {
return children.get(0);
}
}
/**
* Gets the immediately child elements list from the parent element.
*
* @param parent the parent element in the element tree
* @param tagName the specified tag name
* @return the NOT NULL immediately child elements list
*/
public static List getChildElements(Element parent, String tagName) {
NodeList nodes = parent.getElementsByTagName(tagName);
List elements = new ArrayList();
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
if (node instanceof Element && node.getParentNode() == parent) {
elements.add((Element) node);
}
}
return elements;
}
/**
* Gets the immediately child elements list from the parent element.
*
* @param parent the parent element in the element tree
* @return the NOT NULL immediately child elements list
*/
public static List getChildElements(Element parent) {
NodeList nodes = parent.getChildNodes();
List elements = new ArrayList();
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
if (node instanceof Element && node.getParentNode() == parent) {
elements.add((Element) node);
}
}
return elements;
}
/**
* Gets the immediately child element from the parent element.
*
* @param parent the parent element in the element tree
* @param tagName the specified tag name
* @return immediately child element of parent element, NULL otherwise
*/
public static Element getChildElement(Element parent, String tagName) {
List children = getChildElements(parent, tagName);
if (children.isEmpty()) {
return null;
} else {
return children.get(0);
}
}
/**
* Gets the value of the child element by tag name under the given parent
* element. If there is more than one child element, return the value of the
* first one.
*
* @param parent the parent element
* @param tagName the tag name of the child element
* @return value of the first child element, NULL if tag not exists
*/
public static String getElementValue(Element parent, String tagName) {
Element element = getElement(parent, tagName);
if (element != null) {
return element.getTextContent();
} else {
return null;
}
}
/**
* Gets the value of the immediately child element by tag name under the given parent
* element. If there is more than one child element, return the value of the
* first one.
*
* @param parent the parent element
* @param tagName the tag name of the child element
* @return value of the first child element, NULL if tag not exists
*/
public static String getChildElementValue(Element parent, String tagName) {
Element element = getChildElement(parent, tagName);
if (element != null) {
return element.getTextContent();
} else {
return null;
}
}
/**
* Gets the text value of current element.
*
* @param element the current element
* @return text value of the element, NULL if element not exists
*/
public static String getElementValue(Element element) {
if (element != null) {
NodeList nodes = element.getChildNodes();
if (nodes != null && nodes.getLength() > 0) {
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
if (node instanceof Text) {
return ((Text) node).getData();
}
}
}
}
return null;
}
/**
* Gets the specific attribute's value form current element.
*
* @param current current element
* @param attrName attribute name in current element
* @return attribute value if not null
*/
public static String getAttributeValue(Element current, String attrName) {
if (current.hasAttribute(attrName)) {
return current.getAttribute(attrName);
} else {
return null;
}
}
/**
* Appends the child element to the parent element.
*
* @param parent the parent element
* @param tagName the child element name
* @return the child element added to the parent element
*/
public static Element appendElement(Element parent, String tagName) {
Element child = parent.getOwnerDocument().createElement(tagName);
parent.appendChild(child);
return child;
}
/**
* Appends the child element as well as value to the parent element.
*
* @param parent the parent element
* @param tagName the child element name
* @param value the child element value
* @return the child element added to the parent element
*/
public static Element appendElement(Element parent, String tagName, String value) {
Element child = appendElement(parent, tagName);
child.setTextContent(value);
return child;
}
/**
* Appends another element as a child element.
*
* @param parent the parent element
* @param child the child element to append
*/
public static void appendElement(Element parent, Element child) {
Node tmp = parent.getOwnerDocument().importNode(child, true);
parent.appendChild(tmp);
}
/**
* Appends the CDATA element to the parent element.
*
* @param parent the parent element
* @param tagName the CDATA element name
* @param value the CDATA element value
* @return the CDATA element added to the parent element
*/
public static Element appendCDATAElement(Element parent, String tagName, String value) {
Element child = appendElement(parent, tagName);
if (value == null) { // avoid "null" word in the XML payload
value = "";
}
Node cdata = child.getOwnerDocument().createCDATASection(value);
child.appendChild(cdata);
return child;
}
/**
* Converts the Node/Element instance to XML payload.
*
* @param node the node/element instance to convert
* @return the XML payload representing the node/element
* @throws ApiException problem converting XML to string
*/
public static String childNodeToString(Node node) throws ApiException {
String payload = null;
try {
Transformer tf = TransformerFactory.newInstance().newTransformer();
Properties props = tf.getOutputProperties();
props.setProperty(OutputKeys.OMIT_XML_DECLARATION, LOGIC_YES);
props.setProperty(OutputKeys.ENCODING, DEFAULT_CHARSET);
tf.setOutputProperties(props);
StringWriter writer = new StringWriter();
tf.transform(new DOMSource(node), new StreamResult(writer));
payload = escapeXml(writer.toString());
} catch (TransformerException e) {
throw new ApiException("XML_TRANSFORM_ERROR", e);
}
return payload;
}
/**
* Converts the Node/Document/Element instance to XML payload.
*
* @param node the node/document/element instance to convert
* @return the XML payload representing the node/document/element
* @throws ApiException problem converting XML to string
*/
public static String nodeToString(Node node) throws ApiException {
String payload = null;
try {
Transformer tf = TransformerFactory.newInstance().newTransformer();
Properties props = tf.getOutputProperties();
props.setProperty(OutputKeys.ENCODING, DEFAULT_CHARSET);
props.setProperty(OutputKeys.INDENT, LOGIC_YES);
tf.setOutputProperties(props);
StringWriter writer = new StringWriter();
tf.transform(new DOMSource(node), new StreamResult(writer));
payload = escapeXml(writer.toString());
} catch (TransformerException e) {
throw new ApiException("XML_TRANSFORM_ERROR", e);
}
return payload;
}
public static String escapeXml(String payload) {
StringBuilder out = new StringBuilder();
for (int i = 0; i < payload.length(); i++) {
char c = payload.charAt(i);
if ((c == 0x9) || (c == 0xA) || (c == 0xD) || ((c >= 0x20) && (c <= 0xD7FF))
|| ((c >= 0xE000) && (c <= 0xFFFD)) || ((c >= 0x10000) && (c <= 0x10FFFF)))
out.append(c);
}
return out.toString();
}
/**
* Converts the an XML file to XML payload.
*
* @param file the XML file instance
* @return the XML payload representing the XML file
* @throws ApiException problem transforming XML to string
*/
public static String xmlToString(File file) throws ApiException {
Element root = getRootElementFromFile(file);
return nodeToString(root);
}
/**
* Converts the an XML file input stream to XML payload.
*
* @param in the XML file input stream
* @return the payload represents the XML file
* @throws ApiException problem transforming XML to string
*/
public static String xmlToString(InputStream in) throws ApiException {
Element root = getRootElementFromStream(in);
return nodeToString(root);
}
/**
* Saves the node/document/element as XML file.
*
* @param doc the XML node/document/element to save
* @param file the XML file to save
* @throws ApiException problem persisting XML file
*/
public static void saveToXml(Node doc, File file) throws ApiException {
saveToXml(doc, file, DEFAULT_CHARSET);
}
/**
* Saves the node/document/element as XML file.
*
* @param doc the XML node/document/element to save
* @param file the XML file to save
* @param charset the string encoding charset
* @throws ApiException problem persisting XML file
*/
public static void saveToXml(Node doc, File file, String charset) throws ApiException {
Writer writer = null;
try {
Transformer tf = TransformerFactory.newInstance().newTransformer();
Properties props = tf.getOutputProperties();
props.setProperty(OutputKeys.METHOD, XMLConstants.XML_NS_PREFIX);
props.setProperty(OutputKeys.INDENT, LOGIC_YES);
tf.setOutputProperties(props);
DOMSource dom = new DOMSource(doc);
writer = new OutputStreamWriter(getOutputStream(file), charset);
Result result = new StreamResult(writer);
tf.transform(dom, result);
} catch (Exception e) {
throw new ApiException("XML_WRITE_FILE_ERROR", e);
} finally {
closeStream(writer);
}
}
/**
* Validates the XML file via the given XML schema file.
*
* @param xml the XML file to validate
* @param xsd the XML schema file
* @throws ApiException error occurs if validation fail
*/
public static void validateXml(InputStream xml, InputStream xsd) throws ApiException {
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
Document doc = dbf.newDocumentBuilder().parse(xml);
validateXml(doc, xsd);
} catch (SAXException e) {
throw new ApiException("XML_VALIDATE_ERROR", e);
} catch (Exception e) {
throw new ApiException("XML_READ_ERROR", e);
} finally {
closeStream(xml);
closeStream(xsd);
}
}
/**
* Validates the XML file via the given XML schema file.
*
* @param root the root element of XML
* @param xsd the XML schema file
* @throws ApiException error occurs if validation fail
*/
public static void validateXml(Node root, InputStream xsd) throws ApiException {
try {
Source source = new StreamSource(xsd);
Schema schema = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI).newSchema(source);
Validator validator = schema.newValidator();
validator.validate(new DOMSource(root));
} catch (SAXException e) {
if (log.isErrorEnabled()) {
log.error("验证XML文件出错：\n" + nodeToString(root));
}
throw new ApiException("XML_VALIDATE_ERROR", e);
} catch (Exception e) {
throw new ApiException("XML_READ_ERROR", e);
} finally {
closeStream(xsd);
}
}
/**
* Transforms the XML content to XHTML/HTML format string with the XSL.
*
* @param payload the XML payload to convert
* @param xsltFile the XML stylesheet file
* @return the transformed XHTML/HTML format string
* @throws ApiException problem converting XML to HTML
*/
public static String xmlToHtml(String payload, File xsltFile) throws ApiException {
String result = null;
try {
Source template = new StreamSource(xsltFile);
Transformer transformer = TransformerFactory.newInstance().newTransformer(template);
Properties props = transformer.getOutputProperties();
props.setProperty(OutputKeys.OMIT_XML_DECLARATION, LOGIC_YES);
transformer.setOutputProperties(props);
StreamSource source = new StreamSource(new StringReader(payload));
StreamResult sr = new StreamResult(new StringWriter());
transformer.transform(source, sr);
result = sr.getWriter().toString();
} catch (TransformerException e) {
throw new ApiException("XML_TRANSFORM_ERROR", e);
}
return result;
}
/**
* Sets the namespace to specific element.
*
* @param element the element to set
* @param namespace the namespace to set
* @param schemaLocation the XML schema file location URI
*/
public static void setNamespace(Element element, String namespace, String schemaLocation) {
element.setAttributeNS(XMLConstants.XMLNS_ATTRIBUTE_NS_URI, XMLConstants.XMLNS_ATTRIBUTE, namespace);
element.setAttributeNS(XMLConstants.XMLNS_ATTRIBUTE_NS_URI, XMLNS_XSI, XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI);
element.setAttributeNS(XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI, XSI_SCHEMA_LOCATION, schemaLocation);
}
/**
* Encode the XML payload to legality character.
*
* @param payload the XML payload to encode
* @return the encoded XML payload
* @throws ApiException problem encoding the XML payload
*/
public static String encodeXml(String payload) throws ApiException {
Element root = createRootElement(XMLConstants.XML_NS_PREFIX);
root.setTextContent(payload);
return childNodeToString(root.getFirstChild());
}
private static void closeStream(Closeable stream) {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
}
}
}
private static InputStream getInputStream(File file) throws ApiException {
InputStream in = null;
try {
in = new FileInputStream(file);
} catch (FileNotFoundException e) {
throw new ApiException("XML_FILE_NOT_FOUND", e);
}
return in;
}
private static OutputStream getOutputStream(File file) throws ApiException {
OutputStream in = null;
try {
in = new FileOutputStream(file);
} catch (FileNotFoundException e) {
throw new ApiException("XML_FILE_NOT_FOUND", e);
}
return in;
}
}
