/* See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* Esri Inc. 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 com.esri.gpt.control.webharvest.client.atom;
import java.io.IOException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;
import com.esri.gpt.framework.http.HttpClientRequest;
import com.esri.gpt.framework.http.XmlHandler;
import com.esri.gpt.framework.util.Val;
import com.esri.gpt.framework.xml.DomUtil;
import com.esri.gpt.framework.xml.NodeListAdapter;
import com.esri.gpt.framework.xml.XmlIoUtil;
/**
* This class is a simple implementation of entry processor.
* It fetch entry node xml.
* @author prat5814
*
*/
public class SimpleEntryProcessor implements IEntryProcessor{
/**
* Extracts xml of entry node and returns xml string.
* @param info the BaseAtomInfo object
* @param entry the entry node
* @return the metadata xml string
*/
@Override
public String extractMetadata(BaseAtomInfo info,Node entry) {
String mdText = "";
try {
Document mdDoc = DomUtil.newDocument();
mdDoc.appendChild(mdDoc.importNode(entry, true));
mdText = XmlIoUtil.domToString(mdDoc);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return mdText;
}
/**
* Makes http request to feed url and returns xml string.
* @param info the base atom info
* @param url the metadata xml url
* @return the metadata xml string.
* @throws IOException if the http request fails due to i/o exception
*/
private String read(BaseAtomInfo info, String sourceUri) throws IOException {
try {
sourceUri = Val.chkStr(sourceUri).replaceAll("\\{", "%7B").replaceAll("\\}", "%7D");
HttpClientRequest cr = new HttpClientRequest();
cr.setUrl(info.newReadMetadataUrl(sourceUri));
XmlHandler sh = new XmlHandler(false);
cr.setContentHandler(sh);
cr.setCredentialProvider(info.newCredentialProvider());
cr.setBatchHttpClient(info.getBatchHttpClient());
cr.execute();
Document doc = sh.getDocument();
XPath xPath = XPathFactory.newInstance().newXPath();
Node node = (Node) xPath.evaluate(
"/feed/entry",
doc, XPathConstants.NODE);
Node elementNode = null;
for (Node nd : new NodeListAdapter(node.getChildNodes())) {
if (nd.getNodeType()==Node.ELEMENT_NODE) {
elementNode = nd;
break;
}
}
if (elementNode==null) {
throw new IOException("Error extracting metadata from <metadata> node.");
}
Document mdDoc = DomUtil.newDocument();
mdDoc.appendChild(mdDoc.importNode(elementNode, true));
String mdText = XmlIoUtil.domToString(mdDoc);
return mdText;
} catch (TransformerException ex) {
throw new IOException("Error accessing metadata. Cause: "+ex.getMessage());
} catch (SAXException ex) {
throw new IOException("Error accessing metadata. Cause: "+ex.getMessage());
} catch (ParserConfigurationException ex) {
throw new IOException("Error accessing metadata. Cause: "+ex.getMessage());
} catch (XPathExpressionException ex) {
throw new IOException("Error accessing metadata. Cause: "+ex.getMessage());
}
}
}