| /* |
| * 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.axis2.dataretrieval; |
| |
| import org.apache.axiom.om.OMAbstractFactory; |
| import org.apache.axiom.om.OMElement; |
| import org.apache.axiom.om.OMException; |
| import org.apache.axiom.om.OMFactory; |
| import org.apache.axiom.om.impl.builder.StAXOMBuilder; |
| import org.apache.axiom.om.util.StAXUtils; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import javax.xml.stream.XMLStreamException; |
| import javax.xml.stream.XMLStreamReader; |
| import java.io.InputStream; |
| |
| public class DataRetrievalUtil { |
| private static final Log log = LogFactory.getLog(DataRetrievalUtil.class); |
| |
| private static DataRetrievalUtil instance = null; |
| |
| public static DataRetrievalUtil getInstance() { |
| if (instance == null) { |
| instance = new DataRetrievalUtil(); |
| } |
| return instance; |
| } |
| |
| /** |
| * Loading xml file content and convert to OMElement. |
| * |
| * @param file - file path relative to the Service Repository |
| * @return OMElement format of the xml file content |
| * @throws DataRetrievalException |
| */ |
| |
| public OMElement buildOM(ClassLoader classLoader, String file) |
| throws DataRetrievalException { |
| OMElement element = null; |
| InputStream servicexmlStream = null; |
| try { |
| servicexmlStream = getInputStream(classLoader, file); |
| |
| element = convertToOMElement(servicexmlStream); |
| } catch (Exception e) { |
| throw new DataRetrievalException("Failed to load from file, " + file, e); |
| } |
| |
| |
| return element; |
| } |
| |
| /** |
| * Convert servicexmlStream to OMElement |
| * |
| * @param servicexmlStream InputStream contain xml content |
| * @return OMElement format of the xml content |
| * @throws XMLStreamException |
| */ |
| |
| public static OMElement convertToOMElement(InputStream servicexmlStream) |
| throws XMLStreamException, OMException{ |
| OMElement element = null; |
| |
| XMLStreamReader xmlReader = StAXUtils |
| .createXMLStreamReader(servicexmlStream); |
| OMFactory fac = OMAbstractFactory.getOMFactory(); |
| StAXOMBuilder staxOMBuilder = new StAXOMBuilder(fac, xmlReader); |
| element = staxOMBuilder.getDocumentElement(); |
| element.build(); |
| return element; |
| } |
| |
| private static InputStream getInputStream(ClassLoader classLoader, |
| String file) throws XMLStreamException { |
| |
| InputStream servicexmlStream = classLoader.getResourceAsStream(file); |
| |
| if (servicexmlStream == null) { |
| String message = "File does not exist in the Service Repository! File=" |
| + file; |
| if (log.isDebugEnabled()) { |
| log.debug(message); |
| } |
| throw new XMLStreamException(message); |
| } |
| return servicexmlStream; |
| |
| } |
| |
| } |