Java tutorial
/** * DataCleaner (community edition) * Copyright (C) 2013 Human Inference * * This copyrighted material is made available to anyone wishing to use, modify, * copy, or redistribute it subject to the terms and conditions of the GNU * Lesser General Public License, as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License * for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this distribution; if not, write to: * Free Software Foundation, Inc. * 51 Franklin Street, Fifth Floor * Boston, MA 02110-1301 USA */ package org.eobjects.datacleaner.monitor.pentaho; import java.io.InputStream; import java.util.ArrayList; import java.util.List; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.apache.commons.codec.EncoderException; import org.apache.commons.codec.net.URLCodec; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.auth.AuthScope; import org.apache.http.auth.UsernamePasswordCredentials; import org.apache.http.auth.params.AuthPNames; import org.apache.http.client.CredentialsProvider; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.params.AuthPolicy; import org.apache.http.impl.client.DefaultHttpClient; import org.eobjects.analyzer.util.StringUtils; import org.eobjects.datacleaner.monitor.pentaho.jaxb.PentahoJobType; import org.eobjects.metamodel.util.FileHelper; import org.springframework.util.xml.DomUtils; import org.w3c.dom.Document; import org.w3c.dom.Element; /** * Helper class for HTTP interactions with Carte */ public final class PentahoCarteClient { private final PentahoJobType _pentahoJobType; private final HttpClient _httpClient; public PentahoCarteClient(PentahoJobType pentahoJobType) { _pentahoJobType = pentahoJobType; _httpClient = createHttpClient(pentahoJobType); } private HttpClient createHttpClient(PentahoJobType pentahoJobType) { final String hostname = pentahoJobType.getCarteHostname(); final Integer port = pentahoJobType.getCartePort(); final String username = pentahoJobType.getCarteUsername(); final String password = pentahoJobType.getCartePassword(); final DefaultHttpClient httpClient = new DefaultHttpClient(); final CredentialsProvider credentialsProvider = httpClient.getCredentialsProvider(); final UsernamePasswordCredentials credentials = new UsernamePasswordCredentials(username, password); final List<String> authpref = new ArrayList<String>(); authpref.add(AuthPolicy.BASIC); authpref.add(AuthPolicy.DIGEST); httpClient.getParams().setParameter(AuthPNames.PROXY_AUTH_PREF, authpref); credentialsProvider.setCredentials(new AuthScope(hostname, port), credentials); return httpClient; } public List<PentahoTransformation> getAvailableTransformations() throws PentahoJobException { final String statusUrl = getUrl("status", null, null); final HttpGet request = new HttpGet(statusUrl); try { final HttpResponse response = execute(request); final int statusCode = response.getStatusLine().getStatusCode(); if (statusCode == 200) { final List<PentahoTransformation> result = new ArrayList<PentahoTransformation>(); final Document doc = parse(response.getEntity()); final Element serverstatusElement = doc.getDocumentElement(); final Element transstatuslistElement = DomUtils.getChildElementByTagName(serverstatusElement, "transstatuslist"); final List<Element> transstatusElements = DomUtils.getChildElements(transstatuslistElement); for (Element transstatusElement : transstatusElements) { final String transId = DomUtils.getChildElementValueByTagName(transstatusElement, "id"); final String transName = DomUtils.getChildElementValueByTagName(transstatusElement, "transname"); final PentahoTransformation transformation = new PentahoTransformation(transId, transName); result.add(transformation); } return result; } else { throw new PentahoJobException( "Unexpected response status when updating transformation status: " + statusCode); } } finally { request.releaseConnection(); } } public HttpResponse execute(HttpGet request) { try { return _httpClient.execute(request); } catch (Exception e) { throw new PentahoJobException("Failed to invoke HTTP request: " + e.getMessage(), e); } } private DocumentBuilder getDocumentBuilder() { try { return DocumentBuilderFactory.newInstance().newDocumentBuilder(); } catch (Exception e) { throw new IllegalStateException("Failed to instantiate a DocumentBuilder for parsing XML", e); } } public Document parse(HttpEntity entity) throws PentahoJobException { final DocumentBuilder documentBuilder = getDocumentBuilder(); InputStream content = null; try { content = entity.getContent(); return documentBuilder.parse(content); } catch (Exception e) { throw new PentahoJobException("Failed to parse XML response", e); } finally { FileHelper.safeClose(content); } } private String getUrl(String serviceName, String id, String name) throws PentahoJobException { final URLCodec urlCodec = new URLCodec(); final StringBuilder url = new StringBuilder(); url.append("http://"); url.append(_pentahoJobType.getCarteHostname()); url.append(':'); url.append(_pentahoJobType.getCartePort()); url.append("/kettle/"); url.append(serviceName); url.append("/?xml=y"); if (!StringUtils.isNullOrEmpty(id)) { url.append("&id="); try { final String encodedId = urlCodec.encode(id); url.append(encodedId); } catch (EncoderException e) { throw new PentahoJobException("Failed to encode transformation id: " + id); } } if (!StringUtils.isNullOrEmpty(name)) { url.append("&name="); try { final String encodedName = urlCodec.encode(name); url.append(encodedName); } catch (EncoderException e) { throw new PentahoJobException("Failed to encode transformation name: " + name); } } return url.toString(); } public String getUrl(String serviceName) throws PentahoJobException { return getUrl(serviceName, _pentahoJobType.getTransformationId(), _pentahoJobType.getTransformationName()); } }