content: /*
   * Copyright (C) 2007 The Android Open Source Project
   *
   * 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 android.util;
  
  import libcore.util.XmlObjectFactory;
  
  import org.xml.sax.ContentHandler;
  import org.xml.sax.InputSource;
  import org.xml.sax.SAXException;
  import org.xml.sax.XMLReader;
  import org.xmlpull.v1.XmlPullParser;
  import org.xmlpull.v1.XmlPullParserException;
  import org.xmlpull.v1.XmlSerializer;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.Reader;
  import java.io.StringReader;
  import java.io.UnsupportedEncodingException;
  
  /**
   * XML utility methods.
   */
  public class Xml {
      private Xml() {}
  
      /**
       * {@link org.xmlpull.v1.XmlPullParser} "relaxed" feature name.
       *
       * @see <a href="http://xmlpull.org/v1/doc/features.html#relaxed">
       *  specification</a>
       */
      public static String FEATURE_RELAXED = "http://xmlpull.org/v1/doc/features.html#relaxed";
  
      /**
       * Parses the given xml string and fires events on the given SAX handler.
       */
      public static void parse(String xml, ContentHandler contentHandler)
              throws SAXException {
          try {
              XMLReader reader = XmlObjectFactory.newXMLReader();
              reader.setContentHandler(contentHandler);
              reader.parse(new InputSource(new StringReader(xml)));
          } catch (IOException e) {
              throw new AssertionError(e);
          }
      }
  
      /**
       * Parses xml from the given reader and fires events on the given SAX
       * handler.
       */
      public static void parse(Reader in, ContentHandler contentHandler)
              throws IOException, SAXException {
          XMLReader reader = XmlObjectFactory.newXMLReader();
          reader.setContentHandler(contentHandler);
          reader.parse(new InputSource(in));
      }
  
      /**
       * Parses xml from the given input stream and fires events on the given SAX
       * handler.
       */
      public static void parse(InputStream in, Encoding encoding,
              ContentHandler contentHandler) throws IOException, SAXException {
          XMLReader reader = XmlObjectFactory.newXMLReader();
          reader.setContentHandler(contentHandler);
          InputSource source = new InputSource(in);
          source.setEncoding(encoding.expatName);
          reader.parse(source);
      }
  
      /**
       * Returns a new pull parser with namespace support.
       */
      public static XmlPullParser newPullParser() {
          try {
              XmlPullParser parser = XmlObjectFactory.newXmlPullParser();
              parser.setFeature(XmlPullParser.FEATURE_PROCESS_DOCDECL, true);
              parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true);
              return parser;
          } catch (XmlPullParserException e) {
              throw new AssertionError();
          }
      }
  
      /**
       * Creates a new xml serializer.
       */
      public static XmlSerializer newSerializer() {
          return XmlObjectFactory.newXmlSerializer();
      }
  
      /**
       * Supported character encodings.
       */
      public enum Encoding {
  
          US_ASCII("US-ASCII"),
          UTF_8("UTF-8"),
          UTF_16("UTF-16"),
          ISO_8859_1("ISO-8859-1");
  
          final String expatName;
  
          Encoding(String expatName) {
              this.expatName = expatName;
          }
      }
  
      /**
       * Finds an encoding by name. Returns UTF-8 if you pass {@code null}.
       */
      public static Encoding findEncodingByName(String encodingName)
              throws UnsupportedEncodingException {
          if (encodingName == null) {
              return Encoding.UTF_8;
          }
  
          for (Encoding encoding : Encoding.values()) {
              if (encoding.expatName.equalsIgnoreCase(encodingName))
                  return encoding;
          }
          throw new UnsupportedEncodingException(encodingName);
      }
  
      /**
       * Return an AttributeSet interface for use with the given XmlPullParser.
       * If the given parser itself implements AttributeSet, that implementation
       * is simply returned.  Otherwise a wrapper class is
       * instantiated on top of the XmlPullParser, as a proxy for retrieving its
       * attributes, and returned to you.
       *
       * @param parser The existing parser for which you would like an
       *               AttributeSet.
       *
       * @return An AttributeSet you can use to retrieve the
       *         attribute values at each of the tags as the parser moves
       *         through its XML document.
       *
       * @see AttributeSet
       */
      public static AttributeSet asAttributeSet(XmlPullParser parser) {
          return (parser instanceof AttributeSet)
                  ? (AttributeSet) parser
                  : new XmlPullAttributes(parser);
      }
  }
  