xmlutils.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.axis2.util;

import com.ibm.wsdl.Constants;
import org.apache.axiom.om.OMAbstractFactory;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMFactory;
import org.apache.axiom.om.OMNode;
import org.apache.axiom.om.impl.builder.StAXOMBuilder;
import org.apache.axiom.om.util.Base64;
import org.apache.axiom.om.util.StAXUtils;
import org.w3c.dom.Attr;
import org.w3c.dom.CharacterData;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;

import javax.xml.namespace.QName;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Stack;


public class XMLUtils {
    public static final String charEncoding = "ISO-8859-1";
    private static final String saxParserFactoryProperty =
            "javax.xml.parsers.SAXParserFactory";

    private static DocumentBuilderFactory dbf = getDOMFactory();
    private static SAXParserFactory saxFactory;
    private static Stack saxParsers = new Stack();

    private static String empty = "";
    private static ByteArrayInputStream bais = new ByteArrayInputStream(empty.getBytes());

    static {
        // Initialize SAX Parser factory defaults
        initSAXFactory(null, true, false);
    }

    /**
     * Initializes the SAX parser factory.
     *
     * @param factoryClassName The (optional) class name of the desired
     *                         SAXParserFactory implementation. Will be
     *                         assigned to the system property
     *                         <b>javax.xml.parsers.SAXParserFactory</b>
     *                         unless this property is already set.
     *                         If <code>null</code>, leaves current setting
     *                         alone.
     * @param namespaceAware   true if we want a namespace-aware parser
     * @param validating       true if we want a validating parser
     */
    public static void initSAXFactory(String factoryClassName,
                                      boolean namespaceAware,
                                      boolean validating) {
        if (factoryClassName != null) {
            try {
                saxFactory = (SAXParserFactory) Loader.loadClass(factoryClassName).
                        newInstance();
                /*
                 * Set the system property only if it is not already set to
                 * avoid corrupting environments in which Axis is embedded.
                 */
                if (System.getProperty(saxParserFactoryProperty) == null) {
                    System.setProperty(saxParserFactoryProperty,
                                       factoryClassName);
                }
            } catch (Exception e) {
                //log.error(Messages.getMessage("exception00"), e);
                saxFactory = null;
            }
        } else {
            saxFactory = SAXParserFactory.newInstance();
        }
        saxFactory.setNamespaceAware(namespaceAware);
        saxFactory.setValidating(validating);

        // Discard existing parsers
        saxParsers.clear();
    }

    private static DocumentBuilderFactory getDOMFactory() {
        DocumentBuilderFactory dbf;
        try {
            dbf = DocumentBuilderFactory.newInstance();
            dbf.setNamespaceAware(true);
        }
        catch (Exception e) {
            //log.error(Messages.getMessage("exception00"), e );
            dbf = null;
        }
        return (dbf);
    }

    private static boolean tryReset = true;

    /**
     * Returns a SAX parser for reuse.
     *
     * @param parser A SAX parser that is available for reuse
     */
    public static void releaseSAXParser(SAXParser parser) {
        if (!tryReset) {
            return;
        }

        //Free up possible ref. held by past contenthandler.
        try {
            XMLReader xmlReader = parser.getXMLReader();
            if (null != xmlReader) {
                synchronized (XMLUtils.class) {
                    saxParsers.push(parser);
                }
            } else {
                tryReset = false;
            }
        } catch (org.xml.sax.SAXException e) {
            tryReset = false;
        }
    }

    /**
     * Gets an empty new Document.
     *
     * @return Returns Document.
     * @throws ParserConfigurationException if construction problems occur
     */
    public static Document newDocument()
            throws ParserConfigurationException {
        synchronized (dbf) {
            return dbf.newDocumentBuilder().newDocument();
        }
    }

    /**
     * Gets a new Document read from the input source.
     *
     * @return Returns Document.
     * @throws ParserConfigurationException if construction problems occur
     * @throws SAXException                 if the document has xml sax problems
     * @throws IOException                  if i/o exceptions occur
     */
    public static Document newDocument(InputSource inp)
            throws ParserConfigurationException, SAXException, IOException {
        DocumentBuilder db;
        synchronized (dbf) {
            try {
                db = dbf.newDocumentBuilder();
            } catch (Exception e){
                // Under some peculiar conditions (classloader issues), just scrap the old dbf, create a new one and try again.
                dbf = getDOMFactory();
                db = dbf.newDocumentBuilder();
            }
        }
        db.setEntityResolver(new DefaultEntityResolver());
        db.setErrorHandler(new ParserErrorHandler());
        return (db.parse(inp));
    }

    /**
     * Gets a new Document read from the input stream
     *
     * @return Returns Document.
     * @throws ParserConfigurationException if construction problems occur
     * @throws SAXException                 if the document has xml sax problems
     * @throws IOException                  if i/o exceptions occur
     */
    public static Document newDocument(InputStream inp)
            throws ParserConfigurationException, SAXException, IOException {
        return XMLUtils.newDocument(new InputSource(inp));
    }

    /**
     * Gets a new Document read from the indicated uri
     *
     * @return Returns Document.
     * @throws ParserConfigurationException if construction problems occur
     * @throws SAXException                 if the document has xml sax problems
     * @throws IOException                  if i/o exceptions occur
     */
    public static Document newDocument(String uri)
            throws ParserConfigurationException, SAXException, IOException {
        // call the authenticated version as there might be 
        // username/password info embeded in the uri.
        return XMLUtils.newDocument(uri, null, null);
    }

    /**
     * Creates a new document from the given URI. Uses the username and password
     * if the URI requires authentication.
     *
     * @param uri      the resource to get
     * @param username basic auth username
     * @param password basic auth password
     * @throws ParserConfigurationException if construction problems occur
     * @throws SAXException                 if the document has xml sax problems
     * @throws IOException                  if i/o exceptions occur
     */
    public static Document newDocument(String uri, String username, String password)
            throws ParserConfigurationException, SAXException, IOException {
        InputSource ins = XMLUtils.getInputSourceFromURI(uri, username, password);
        Document doc = XMLUtils.newDocument(ins);
        // Close the Stream
        if (ins.getByteStream() != null) {
            ins.getByteStream().close();
        } else if (ins.getCharacterStream() != null) {
            ins.getCharacterStream().close();
        }
        return doc;
    }


    public static String getPrefix(String uri, Node e) {
        while (e != null && (e.getNodeType() == Element.ELEMENT_NODE)) {
            NamedNodeMap attrs = e.getAttributes();
            for (int n = 0; n < attrs.getLength(); n++) {
                Attr a = (Attr) attrs.item(n);
                String name;
                if ((name = a.getName()).startsWith("xmlns:") &&
                        a.getNodeValue().equals(uri)) {
                    return name.substring(6);
                }
            }
            e = e.getParentNode();
        }
        return null;
    }

    public static String getNamespace(String prefix, Node e) {
        while (e != null && (e.getNodeType() == Node.ELEMENT_NODE)) {
            Attr attr =
                    ((Element) e).getAttributeNodeNS(Constants.NS_URI_XMLNS, prefix);
            if (attr != null) {
                return attr.getValue();
            }
            e = e.getParentNode();
        }
        return null;
    }

    /**
     * Returns a QName when passed a string like "foo:bar" by mapping
     * the "foo" prefix to a namespace in the context of the given Node.
     *
     * @return Returns a QName generated from the given string representation.