Java tutorial
/** * Copyright (C) 2007 - 2014 52North Initiative for Geospatial Open Source * Software GmbH * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. * * If the program is linked with libraries which are licensed under one of * the following licenses, the combination of the program with the linked * library is not considered a "derivative work" of the program: * * Apache License, version 2.0 * Apache Software License, version 1.0 * GNU Lesser General Public License, version 3 * Mozilla Public License, versions 1.0, 1.1 and 2.0 * Common Development and Distribution License (CDDL), version 1.0 * * Therefore the distribution of the program linked with libraries licensed * under the aforementioned licenses, is permitted by the copyright holders * if the distribution is compliant with both the GNU General Public * License version 2 and the aforementioned licenses. * * 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 General * Public License for more details. */ package org.n52.wps.server.request.strategy; import java.io.BufferedReader; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import java.util.zip.GZIPInputStream; import net.opengis.wps.x100.InputType; import org.apache.commons.codec.binary.Base64InputStream; import org.apache.commons.io.IOUtils; import org.apache.http.Header; import org.apache.http.HttpEntity; import org.apache.xmlbeans.XmlObject; import org.n52.wps.server.ExceptionReport; public class WCS111XMLEmbeddedBase64OutputReferenceStrategy implements IReferenceStrategy { private String fetchedMimeType; private String fetchedEncoding; @Override public boolean isApplicable(InputType input) { if (input.getReference().isSetBody()) { XmlObject xo = input.getReference().getBody(); return xo.toString().contains("http://www.opengis.net/wcs/1.1.1"); } else { String dataURLString = input.getReference().getHref(); return (dataURLString.contains("=GetCoverage") && dataURLString.contains("=1.1.1")); } } @Override public ReferenceInputStream fetchData(InputType input) throws ExceptionReport { String dataURLString = input.getReference().getHref(); String schema = input.getReference().getSchema(); String encoding = input.getReference().getEncoding(); String mimeType = input.getReference().getMimeType(); try { URL dataURL = new URL(dataURLString); // Do not give a direct inputstream. // The XML handlers cannot handle slow connections URLConnection conn = dataURL.openConnection(); conn.setRequestProperty("Accept-Encoding", "gzip"); conn.setRequestProperty("Content-type", "multipart/mixed"); //Handling POST with referenced document if (input.getReference().isSetBodyReference()) { String bodyReference = input.getReference().getBodyReference().getHref(); URL bodyReferenceURL = new URL(bodyReference); URLConnection bodyReferenceConn = bodyReferenceURL.openConnection(); bodyReferenceConn.setRequestProperty("Accept-Encoding", "gzip"); InputStream referenceInputStream = retrievingZippedContent(bodyReferenceConn); IOUtils.copy(referenceInputStream, conn.getOutputStream()); } //Handling POST with inline message else if (input.getReference().isSetBody()) { conn.setDoOutput(true); input.getReference().getBody().save(conn.getOutputStream()); } InputStream inputStream = retrievingZippedContent(conn); BufferedReader bRead = new BufferedReader(new InputStreamReader(inputStream)); String line = ""; //boundary between different content types String boundary = ""; boolean boundaryFound = false; boolean encodedImagepart = false; String encodedImage = ""; //e.g. base64 String contentTransferEncoding = ""; String imageContentType = ""; int boundaryCount = 0; while ((line = bRead.readLine()) != null) { if (line.contains("boundary")) { boundary = line.substring(line.indexOf("\"") + 1, line.lastIndexOf("\"")); boundaryFound = true; continue; } if (boundaryFound) { if (line.contains(boundary)) { boundaryCount++; continue; } } if (encodedImagepart) { encodedImage = encodedImage.concat(line); } //is the image always the third part?! else if (boundaryCount == 2) { if (line.contains("Content-Type")) { imageContentType = line.substring(line.indexOf(":") + 1).trim(); } else if (line.contains("Content-Transfer-Encoding")) { contentTransferEncoding = line.substring(line.indexOf(":") + 1).trim(); } else if (line.contains("Content-ID")) { /* just move further one line (which is hopefully empty) * and start parsing the encoded image */ line = bRead.readLine(); encodedImagepart = true; } } } return new ReferenceInputStream( new Base64InputStream(new ByteArrayInputStream(encodedImage.getBytes())), imageContentType, null); // encoding is null since encoding was removed } catch (RuntimeException e) { throw new ExceptionReport("Error occured while parsing XML", ExceptionReport.NO_APPLICABLE_CODE, e); } catch (MalformedURLException e) { String inputID = input.getIdentifier().getStringValue(); throw new ExceptionReport( "The inputURL of the execute is wrong: inputID: " + inputID + " | dataURL: " + dataURLString, ExceptionReport.INVALID_PARAMETER_VALUE); } catch (IOException e) { String inputID = input.getIdentifier().getStringValue(); throw new ExceptionReport("Error occured while receiving the complexReferenceURL: inputID: " + inputID + " | dataURL: " + dataURLString, ExceptionReport.INVALID_PARAMETER_VALUE); } } private InputStream retrievingZippedContent(URLConnection conn) throws IOException { String contentType = conn.getContentEncoding(); if (contentType != null && contentType.equals("gzip")) { return new GZIPInputStream(conn.getInputStream()); } else { return conn.getInputStream(); } } }