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96 lines
2.9 KiB
96 lines
2.9 KiB
11 years ago
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package de.timroes.axmlrpc;
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import de.timroes.axmlrpc.serializer.SerializerHandler;
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import java.io.InputStream;
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import java.util.Map;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import org.w3c.dom.Document;
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import org.w3c.dom.Element;
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/**
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* The ResponseParser parses the response of an XMLRPC server to an object.
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*
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* @author Tim Roes
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*/
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class ResponseParser {
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private static final String FAULT_CODE = "faultCode";
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private static final String FAULT_STRING = "faultString";
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/**
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* The given InputStream must contain the xml response from an xmlrpc server.
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* This method extract the content of it as an object.
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*
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* @param response The InputStream of the server response.
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* @return The returned object.
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* @throws XMLRPCException Will be thrown whenever something fails.
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* @throws XMLRPCServerException Will be thrown, if the server returns an error.
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*/
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public Object parse(InputStream response) throws XMLRPCException {
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try {
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DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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factory.setNamespaceAware(true);
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DocumentBuilder builder = factory.newDocumentBuilder();
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Document dom = builder.parse(response);
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Element e = dom.getDocumentElement();
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// Check for root tag
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if(!e.getNodeName().equals(XMLRPCClient.METHOD_RESPONSE)) {
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throw new XMLRPCException("MethodResponse root tag is missing.");
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}
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e = XMLUtil.getOnlyChildElement(e.getChildNodes());
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if(e.getNodeName().equals(XMLRPCClient.PARAMS)) {
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e = XMLUtil.getOnlyChildElement(e.getChildNodes());
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if(!e.getNodeName().equals(XMLRPCClient.PARAM)) {
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throw new XMLRPCException("The params tag must contain a param tag.");
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}
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return getReturnValueFromElement(e);
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} else if(e.getNodeName().equals(XMLRPCClient.FAULT)) {
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@SuppressWarnings("unchecked")
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Map<String,Object> o = (Map<String,Object>)getReturnValueFromElement(e);
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throw new XMLRPCServerException((String)o.get(FAULT_STRING), (Integer)o.get(FAULT_CODE));
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}
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throw new XMLRPCException("The methodResponse tag must contain a fault or params tag.");
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} catch (Exception ex) {
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if(ex instanceof XMLRPCServerException)
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throw (XMLRPCServerException)ex;
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else
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throw new XMLRPCException("Error getting result from server.", ex);
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}
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}
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/**
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* This method takes an element (must be a param or fault element) and
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* returns the deserialized object of this param tag.
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*
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* @param element An param element.
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* @return The deserialized object within the given param element.
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* @throws XMLRPCException Will be thrown when the structure of the document
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* doesn't match the XML-RPC specification.
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*/
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private Object getReturnValueFromElement(Element element) throws XMLRPCException {
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element = XMLUtil.getOnlyChildElement(element.getChildNodes());
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return SerializerHandler.getDefault().deserialize(element);
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}
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}
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