| /******************************************************************************* |
| * 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.olingo.odata2.core.commons; |
| |
| import java.io.InputStream; |
| |
| import javax.xml.stream.XMLInputFactory; |
| import javax.xml.stream.XMLOutputFactory; |
| import javax.xml.stream.XMLStreamException; |
| import javax.xml.stream.XMLStreamReader; |
| import javax.xml.transform.TransformerFactory; |
| |
| import org.apache.olingo.odata2.api.ep.EntityProviderException; |
| |
| public class XmlHelper { |
| |
| /** Default used charset for reader */ |
| private static final String DEFAULT_CHARSET = "UTF-8"; |
| |
| static class XmlInputFactoryHolder { |
| private static final XMLInputFactory INSTANCE = XMLInputFactory.newInstance(); |
| } |
| static class XmlOutputFactoryHolder { |
| private static final XMLOutputFactory INSTANCE = XMLOutputFactory.newInstance(); |
| } |
| static class TransformerFactoryHolder { |
| private static final TransformerFactory INSTANCE = TransformerFactory.newInstance(); |
| } |
| |
| public static XMLInputFactory getXMLInputFactory() { |
| return XmlInputFactoryHolder.INSTANCE; |
| } |
| public static XMLOutputFactory getXMLOutputFactory() { |
| return XmlOutputFactoryHolder.INSTANCE; |
| } |
| public static TransformerFactory getTransformerFactory() { |
| return TransformerFactoryHolder.INSTANCE; |
| } |
| |
| public static XMLStreamReader createStreamReader(final Object content) throws EntityProviderException { |
| if (content == null) { |
| throw new EntityProviderException(EntityProviderException.ILLEGAL_ARGUMENT |
| .addContent("Got not allowed NULL parameter for creation of XMLStreamReader.")); |
| } |
| XMLStreamReader streamReader; |
| try { |
| XMLInputFactory factory = getXMLInputFactory(); |
| factory.setProperty(XMLInputFactory.IS_VALIDATING, false); |
| factory.setProperty(XMLInputFactory.IS_NAMESPACE_AWARE, true); |
| factory.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, false); |
| factory.setProperty(XMLInputFactory.SUPPORT_DTD, false); |
| |
| if (content instanceof InputStream) { |
| streamReader = factory.createXMLStreamReader((InputStream) content, DEFAULT_CHARSET); |
| // verify charset encoding set in content is supported (if not set UTF-8 is used as defined in |
| // v'http://www.w3.org/TR/2008/REC-xml-20081126/') |
| String characterEncodingInContent = streamReader.getCharacterEncodingScheme(); |
| if (characterEncodingInContent != null && !DEFAULT_CHARSET.equalsIgnoreCase(characterEncodingInContent)) { |
| throw new EntityProviderException(EntityProviderException |
| .UNSUPPORTED_CHARACTER_ENCODING.addContent(characterEncodingInContent)); |
| } |
| } else { |
| throw new EntityProviderException(EntityProviderException.ILLEGAL_ARGUMENT |
| .addContent("Found not supported content of class '" + content.getClass() + "' to de-serialize.")); |
| } |
| return streamReader; |
| } catch (XMLStreamException e) { |
| throw new EntityProviderException(EntityProviderException.EXCEPTION_OCCURRED.addContent(e.getClass() |
| .getSimpleName()), e); |
| } |
| } |
| |
| } |