| /* |
| * 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.axiom.om.ds; |
| |
| import org.apache.axiom.om.OMDataSourceExt; |
| import org.apache.axiom.om.OMException; |
| import org.apache.axiom.om.OMOutputFormat; |
| import org.apache.axiom.om.util.StAXUtils; |
| |
| import javax.xml.stream.XMLStreamException; |
| import javax.xml.stream.XMLStreamReader; |
| import javax.xml.stream.XMLStreamWriter; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.UnsupportedEncodingException; |
| |
| /** |
| * InputStream is an example OMDataSourceExt. |
| * Use it to insert a (InputStream, encoding) into an OM Tree. |
| * This data source is useful for placing an InputStream into an OM |
| * tree, instead of having a deeply nested tree. |
| */ |
| public class InputStreamDataSource extends OMDataSourceExtBase { |
| |
| Data data = null; |
| private static final int BUFFER_LEN = 4096; |
| |
| /** |
| * Constructor |
| * @param is |
| * @param encoding |
| */ |
| public InputStreamDataSource(InputStream is, String encoding) { |
| data = new Data(); |
| data.is = is; |
| data.encoding = encoding; |
| } |
| |
| public void serialize(OutputStream output, OMOutputFormat format) throws XMLStreamException { |
| if (data == null) { |
| throw new OMException("The InputStreamDataSource does not have a backing object"); |
| } |
| String encoding = format.getCharSetEncoding(); |
| try { |
| if (!data.encoding.equalsIgnoreCase(encoding)) { |
| byte[] bytes = getXMLBytes(encoding); |
| output.write(bytes); |
| } else { |
| // Write the input stream to the output stream |
| inputStream2OutputStream(data.is, output); |
| } |
| } catch (UnsupportedEncodingException e) { |
| throw new XMLStreamException(e); |
| } catch (IOException e) { |
| throw new XMLStreamException(e); |
| } |
| } |
| |
| public void serialize(XMLStreamWriter xmlWriter) throws XMLStreamException { |
| if (data == null) { |
| throw new OMException("The InputStreamDataSource does not have a backing object"); |
| } |
| super.serialize(xmlWriter); |
| } |
| |
| public XMLStreamReader getReader() throws XMLStreamException { |
| if (data == null) { |
| throw new OMException("The InputStreamDataSource does not have a backing object"); |
| } |
| return StAXUtils.createXMLStreamReader(data.is,data.encoding); |
| } |
| |
| public InputStream getXMLInputStream(String encoding) throws |
| UnsupportedEncodingException{ |
| if (data == null) { |
| throw new OMException("The InputStreamDataSource does not have a backing object"); |
| } |
| return data.is; |
| } |
| |
| public Object getObject() { |
| return data; |
| } |
| |
| public boolean isDestructiveRead() { |
| if (data == null) { |
| throw new OMException("The InputStreamDataSource does not have a backing object"); |
| } |
| return true; |
| } |
| |
| public boolean isDestructiveWrite() { |
| if (data == null) { |
| throw new OMException("The InputStreamDataSource does not have a backing object"); |
| } |
| // Writing an input stream is destructive |
| return true; |
| } |
| |
| public byte[] getXMLBytes(String encoding) throws UnsupportedEncodingException { |
| |
| // Return the byte array directly if it is the same encoding |
| // Otherwise convert the bytes to the proper encoding |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| OMOutputFormat format = new OMOutputFormat(); |
| format.setCharSetEncoding(encoding); |
| try { |
| serialize(baos, format); |
| } catch (XMLStreamException e) { |
| throw new OMException(e); |
| } |
| return baos.toByteArray(); |
| } |
| |
| public void close() { |
| if (data.is != null) { |
| try { |
| data.is.close(); |
| } catch (IOException e) { |
| throw new OMException(e); |
| } |
| data.is = null; |
| } |
| } |
| |
| /** |
| * Return a InputStreamDataSource backed by a ByteArrayInputStream |
| */ |
| public OMDataSourceExt copy() { |
| byte[] bytes; |
| try { |
| bytes = getXMLBytes(data.encoding); |
| } catch (UnsupportedEncodingException e) { |
| throw new OMException(e); |
| } |
| InputStream is1 = new ByteArrayInputStream(bytes); |
| InputStream is2 = new ByteArrayInputStream(bytes); |
| data.is = is1; |
| return new InputStreamDataSource(is2, data.encoding); |
| } |
| |
| /** |
| * Private utility to write the InputStream contents to the OutputStream. |
| * @param is |
| * @param os |
| * @throws IOException |
| */ |
| private static void inputStream2OutputStream(InputStream is, |
| OutputStream os) |
| throws IOException { |
| byte[] buffer = new byte[BUFFER_LEN]; |
| int bytesRead = is.read(buffer); |
| while (bytesRead > 0) { |
| os.write(buffer, 0, bytesRead); |
| bytesRead = is.read(buffer); |
| } |
| } |
| |
| /** |
| * Object containing the InputStream/encoding pair |
| */ |
| public class Data { |
| public String encoding; |
| public InputStream is; |
| } |
| } |