| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. 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. For additional information regarding |
| * copyright in this work, please see the NOTICE file in the top level |
| * directory of this distribution. |
| */ |
| package org.apache.abdera2.common.xml; |
| |
| import java.io.IOException; |
| import java.io.PushbackReader; |
| import java.io.Reader; |
| |
| import javax.xml.stream.XMLInputFactory; |
| import javax.xml.stream.XMLStreamReader; |
| |
| public class XmlVersionReader extends PushbackReader { |
| |
| private XMLVersion version = null; |
| private final int peek_ahead; |
| private static final int DEFAULT_PEEK_AHEAD = 200; |
| |
| public XmlVersionReader(Reader in, int peek_ahead) { |
| super(in, peek_ahead); |
| this.peek_ahead = peek_ahead; |
| try { |
| version = detectVersion(); |
| } catch (IOException e) { |
| } |
| } |
| |
| public XmlVersionReader(Reader in) { |
| this(in,DEFAULT_PEEK_AHEAD); |
| } |
| |
| public XMLVersion getVersion() { |
| return version; |
| } |
| |
| private XMLVersion detectVersion() throws IOException { |
| String version = "1.0"; |
| try { |
| char[] p = new char[peek_ahead]; |
| int r = read(p); |
| XMLStreamReader xmlreader = |
| XMLInputFactory.newInstance().createXMLStreamReader(new java.io.CharArrayReader(p)); |
| String v = xmlreader.getVersion(); |
| if (v != null) |
| version = v; |
| unread(p, 0, r); |
| } catch (Exception e) { |
| } |
| return XMLVersion.get(version); |
| } |
| } |