XMLBody.java Source code

Introduction

Here is the source code for XMLBody.java

Source

/**
 * 
 */
//org.ajax4jsf.builder.xml;

import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.io.StringWriter;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**
 * This class must read XML file from input stream and can extract body of root
 * element for include into target in generation.
 * 
 * @author shura
 * 
 */
public class XMLBody {
    private Document xmlDocument;

    private Element rootElement;

    /**
     * Load XML document and parse it into DOM.
     * 
     * @param input
     * @throws ParsingException
     */
    public void loadXML(InputStream input) throws Exception {
        try {
            // Create Document Builder Factory
            DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();

            docFactory.setValidating(false);
            // Create Document Builder
            DocumentBuilder docBuilder = docFactory.newDocumentBuilder();

            docBuilder.isValidating();

            // Disable loading of external Entityes
            docBuilder.setEntityResolver(new EntityResolver() {
                // Dummi resolver - alvays do nothing
                public InputSource resolveEntity(String publicId, String systemId)
                        throws SAXException, IOException {
                    return new InputSource(new StringReader(""));
                }

            });

            // open and parse XML-file
            xmlDocument = docBuilder.parse(input);

            // Get Root xmlElement
            rootElement = xmlDocument.getDocumentElement();
        } catch (Exception e) {
            throw new Exception("Error load XML ", e);
        }

    }

    /**
     * Check name of root element is as expected.
     * 
     * @param name
     * @return
     */
    public boolean isRootName(String name) {
        return rootElement.getNodeName().equals(name);
    }

    public String getDoctype() {
        DocumentType doctype = xmlDocument.getDoctype();
        if (null != doctype) {
            return doctype.getName();
        }
        return null;
    }

    public String getPiblicId() {
        DocumentType doctype = xmlDocument.getDoctype();
        if (null != doctype) {
            return doctype.getPublicId();
        }
        return null;
    }

    public String getRootTypeName() {
        return rootElement.getSchemaTypeInfo().getTypeName();
    }

    public String getContent() throws Exception {
        NodeList childNodes = rootElement.getChildNodes();
        return serializeNodes(childNodes);
    }

    private String serializeNodes(NodeList childNodes) throws Exception {
        DocumentFragment fragment = xmlDocument.createDocumentFragment();
        for (int i = 0; i < childNodes.getLength(); i++) {
            fragment.appendChild(childNodes.item(i).cloneNode(true));
        }
        try {
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            transformer.setOutputProperty("omit-xml-declaration", "yes");
            StringWriter out = new StringWriter();
            StreamResult result = new StreamResult(out);
            transformer.transform(new DOMSource(fragment), result);
            return out.toString();

        } catch (Exception e) {
            throw new Exception(e);
        }
    }

    public String getContent(String xpath) throws Exception {
        XPath path = XPathFactory.newInstance().newXPath();
        NodeList childNodes;
        try {
            childNodes = (NodeList) path.evaluate(xpath, xmlDocument, XPathConstants.NODESET);
        } catch (XPathExpressionException e) {
            throw new Exception("Error evaluate xpath", e);
        }
        return serializeNodes(childNodes);
    }
}