src.java.util.XMLUtils Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of android-all Show documentation
A library jar that provides APIs for Applications written for the Google Android Platform.
There is a newer version: 15-robolectric-12650502
/*
 * Copyright (C) 2014 The Android Open Source Project
 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package java.util;

import java.io.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;
import org.w3c.dom.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.stream.*;

/**
 * A class used to aid in Properties load and save in XML. Keeping this
 * code outside of Properties helps reduce the number of classes loaded
 * when Properties is loaded.
 *
 * @author  Michael McCloskey
 * @since   1.3
 */
class XMLUtils {

    // XML loading and saving methods for Properties

    // The required DTD URI for exported properties
    private static final String PROPS_DTD_URI =
    "http://java.sun.com/dtd/properties.dtd";

    private static final String PROPS_DTD =
    "" +
    ""                +
    ""+
    ""         +
    ""              +
    ""                +
    "";

    /**
     * Version number for the format of exported properties files.
     */
    private static final String EXTERNAL_XML_VERSION = "1.0";

    static void load(Properties props, InputStream in)
        throws IOException, InvalidPropertiesFormatException
    {
        Document doc = null;
        try {
            doc = getLoadingDoc(in);
        } catch (SAXException saxe) {
            throw new InvalidPropertiesFormatException(saxe);
        }
        Element propertiesElement = doc.getDocumentElement();
        String xmlVersion = propertiesElement.getAttribute("version");
        if (xmlVersion.compareTo(EXTERNAL_XML_VERSION) > 0)
            throw new InvalidPropertiesFormatException(
                "Exported Properties file format version " + xmlVersion +
                " is not supported. This java installation can read" +
                " versions " + EXTERNAL_XML_VERSION + " or older. You" +
                " may need to install a newer version of JDK.");
        importProperties(props, propertiesElement);
    }

    static Document getLoadingDoc(InputStream in)
        throws SAXException, IOException
    {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        dbf.setIgnoringElementContentWhitespace(true);
        // Android-changed: We don't currently have a validating document builder.
        // Revert this if the situation changes.
        //
        // dbf.setValidating(true);
        dbf.setCoalescing(true);
        dbf.setIgnoringComments(true);
        try {
            DocumentBuilder db = dbf.newDocumentBuilder();
            db.setEntityResolver(new Resolver());
            db.setErrorHandler(new EH());
            InputSource is = new InputSource(in);
            return db.parse(is);
        } catch (ParserConfigurationException x) {
            throw new Error(x);
        }
    }

    static void importProperties(Properties props, Element propertiesElement) {
        NodeList entries = propertiesElement.getChildNodes();
        int numEntries = entries.getLength();
        int start = numEntries > 0 &&
            entries.item(0).getNodeName().equals("comment") ? 1 : 0;
        for (int i=start; i