| /* |
| * 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.tuscany.sca.common.xml; |
| |
| import java.io.BufferedInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.UnsupportedEncodingException; |
| import java.net.JarURLConnection; |
| import java.net.URL; |
| import java.net.URLConnection; |
| |
| import org.xml.sax.InputSource; |
| |
| /** |
| * @version $Rev$ $Date$] |
| * @tuscany.spi.extension.asclient |
| */ |
| public class XMLDocumentHelper { |
| protected static final int BUFFER_SIZE = 256; |
| |
| /** |
| * Detect the XML encoding of the document |
| * |
| * @param is The input stream |
| * @return The encoding |
| * @throws IOException |
| */ |
| public static String getEncoding(InputStream is) throws IOException { |
| if (!is.markSupported()) |
| is = new BufferedInputStream(is); |
| |
| byte[] buffer = readBuffer(is); |
| return getXMLEncoding(buffer); |
| } |
| |
| /** |
| * Searches the array of bytes to determine the XML encoding. |
| */ |
| protected static String getXMLEncoding(byte[] bytes) { |
| String javaEncoding = null; |
| |
| if (bytes.length >= 4) { |
| if (((bytes[0] == -2) && (bytes[1] == -1)) || ((bytes[0] == 0) && (bytes[1] == 60))) |
| javaEncoding = "UnicodeBig"; |
| else if (((bytes[0] == -1) && (bytes[1] == -2)) || ((bytes[0] == 60) && (bytes[1] == 0))) |
| javaEncoding = "UnicodeLittle"; |
| else if ((bytes[0] == -17) && (bytes[1] == -69) && (bytes[2] == -65)) |
| javaEncoding = "UTF8"; |
| } |
| |
| String header = null; |
| |
| try { |
| if (javaEncoding != null) |
| header = new String(bytes, 0, bytes.length, javaEncoding); |
| else |
| header = new String(bytes, 0, bytes.length); |
| } catch (UnsupportedEncodingException e) { |
| return null; |
| } |
| |
| if (!header.startsWith("<?xml")) |
| return "UTF-8"; |
| |
| int endOfXMLPI = header.indexOf("?>"); |
| int encodingIndex = header.indexOf("encoding", 6); |
| |
| if ((encodingIndex == -1) || (encodingIndex > endOfXMLPI)) |
| return "UTF-8"; |
| |
| int firstQuoteIndex = header.indexOf("\"", encodingIndex); |
| int lastQuoteIndex; |
| |
| if ((firstQuoteIndex == -1) || (firstQuoteIndex > endOfXMLPI)) { |
| firstQuoteIndex = header.indexOf("'", encodingIndex); |
| lastQuoteIndex = header.indexOf("'", firstQuoteIndex + 1); |
| } else |
| lastQuoteIndex = header.indexOf("\"", firstQuoteIndex + 1); |
| |
| return header.substring(firstQuoteIndex + 1, lastQuoteIndex); |
| } |
| |
| protected static byte[] readBuffer(InputStream is) throws IOException { |
| if (is.available() == 0) { |
| return new byte[0]; |
| } |
| |
| byte[] buffer = new byte[BUFFER_SIZE]; |
| is.mark(BUFFER_SIZE); |
| int bytesRead = is.read(buffer, 0, BUFFER_SIZE); |
| int totalBytesRead = bytesRead; |
| |
| while (bytesRead != -1 && (totalBytesRead < BUFFER_SIZE)) { |
| bytesRead = is.read(buffer, totalBytesRead, BUFFER_SIZE - totalBytesRead); |
| |
| if (bytesRead != -1) |
| totalBytesRead += bytesRead; |
| } |
| |
| if (totalBytesRead < BUFFER_SIZE) { |
| byte[] smallerBuffer = new byte[totalBytesRead]; |
| System.arraycopy(buffer, 0, smallerBuffer, 0, totalBytesRead); |
| smallerBuffer = buffer; |
| } |
| |
| is.reset(); |
| return buffer; |
| } |
| |
| public static InputSource getInputSource(URL url) throws IOException { |
| InputStream is = openStream(url); |
| return getInputSource(url, is); |
| } |
| |
| private static InputStream openStream(URL url) throws IOException { |
| URLConnection connection = url.openConnection(); |
| if (connection instanceof JarURLConnection) { |
| // See http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5041014 |
| connection.setUseCaches(false); |
| } |
| InputStream is = connection.getInputStream(); |
| return is; |
| } |
| |
| public static InputSource getInputSource(URL url, InputStream is) throws IOException { |
| // is = new BufferedInputStream(is); |
| // String encoding = getEncoding(is); |
| InputSource inputSource = new InputSource(is); |
| // inputSource.setEncoding(encoding); |
| // [rfeng] Make sure we set the system id as it will be used as the base URI for nested import/include |
| inputSource.setSystemId(url.toString()); |
| return inputSource; |
| } |
| |
| } |