root / branches / v2_0_0_prep / libraries / libRemoteServices / src / org / gvsig / remoteclient / wmts / WMTSProtocolHandler.java @ 35471
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/* gvSIG. Geographic Information System of the Valencian Government
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*
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* Copyright (C) 2007-2008 Infrastructures and Transports Department
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* of the Valencian Government (CIT)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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package org.gvsig.remoteclient.wmts; |
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import java.io.BufferedOutputStream; |
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import java.io.ByteArrayInputStream; |
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import java.io.DataInputStream; |
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import java.io.DataOutputStream; |
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import java.io.File; |
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import java.io.FileOutputStream; |
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import java.io.FileReader; |
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import java.io.IOException; |
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import java.io.OutputStreamWriter; |
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import java.net.HttpURLConnection; |
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import java.net.MalformedURLException; |
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import java.net.URL; |
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import java.security.KeyManagementException; |
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import java.security.NoSuchAlgorithmException; |
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import java.util.ArrayList; |
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import java.util.Hashtable; |
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import java.util.StringTokenizer; |
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import java.util.prefs.Preferences; |
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import javax.net.ssl.HttpsURLConnection; |
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import javax.net.ssl.SSLContext; |
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import javax.net.ssl.TrustManager; |
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import javax.net.ssl.X509TrustManager; |
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import org.gvsig.compat.net.ICancellable; |
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import org.gvsig.remoteclient.exceptions.ServerErrorException; |
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import org.gvsig.remoteclient.ogc.OGCProtocolHandler; |
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import org.gvsig.remoteclient.ogc.OGCServiceInformation; |
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import org.gvsig.remoteclient.utils.ExceptionTags; |
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import org.gvsig.remoteclient.utils.Utilities; |
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import org.gvsig.remoteclient.wmts.exception.DownloadException; |
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import org.gvsig.remoteclient.wmts.exception.WMTSException; |
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import org.gvsig.remoteclient.wmts.request.WMTSGetCapabilitiesRequest; |
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import org.gvsig.remoteclient.wmts.request.WMTSGetFeatureInfoRequest; |
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import org.gvsig.remoteclient.wmts.request.WMTSGetTileRequest; |
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import org.kxml2.io.KXmlParser; |
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import org.xmlpull.v1.XmlPullParserException; |
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/**
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* <p> Abstract class that represents handlers to comunicate via WMS protocol.</p>
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*
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* @author Nacho Brodin (nachobrodin@gmail.com)
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*/
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public abstract class WMTSProtocolHandler extends OGCProtocolHandler { |
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/**
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* Encoding used to parse different xml documents.
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*/
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protected String encoding = "UTF-8"; |
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protected WMTSServiceInformation serviceInfo = null; |
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private static int count = 0; |
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final String tempDirectoryPath = System.getProperty("java.io.tmpdir")+"/tmp-andami"; |
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protected boolean forceLongitudeFirstAxisOrder = false; |
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protected abstract WMTSGetFeatureInfoRequest createGetFeatureInfoRequest(WMTSStatus status, int x, int y); |
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protected abstract WMTSGetTileRequest createGetTileRequest(WMTSStatus status); |
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protected abstract WMTSGetCapabilitiesRequest createGetCapabilitiesRequest(); |
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/**
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* Sets longitude first in the axis order read from the capabilities file
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* @param force
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*/
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public void setForceLongitudeFirstAxisOrder(boolean force) { |
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this.forceLongitudeFirstAxisOrder = force;
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} |
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//**************************************************************
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//Esto es temporal hasta que est? la cach?
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private Hashtable downloadedFiles; |
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/**
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* Returns the content of a URL as a file from the file system.<br>
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* <p>
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* If the URL has been already downloaded in this session and notified
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* to the system using the static <b>Utilities.addDownloadedURL(URL)</b>
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* method, it can be restored faster from the file system avoiding to
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* download it again.
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* </p>
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* @param url
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* @return File containing this URL's content or null if no file was found.
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*/
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private File getPreviousDownloaded(Object object) { |
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File f = null; |
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if (downloadedFiles != null && downloadedFiles.containsKey(object)) { |
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String filePath = (String) downloadedFiles.get(object); |
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f = new File(filePath); |
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if (!f.exists())
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return null; |
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} |
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return f;
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} |
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/**
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* Adds an URL to the table of downloaded files for further uses. If the URL
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* already exists in the table its filePath value is updated to the new one and
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* the old file itself is removed from the file system.
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*
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* @param url
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* @param filePath
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*/
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void addDownloadedURL(URL url, String filePath) { |
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if (downloadedFiles == null) |
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downloadedFiles = new Hashtable(); |
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String fileName = (String) downloadedFiles.put(url, filePath); |
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} |
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//Fin del c?digo temporal hasta que est? la cach?
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//**************************************************************
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/**
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* Sets the status object
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* @param status
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*/
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protected abstract void setServerDescription(WMTSServerDescription status); |
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public synchronized File getTile(WMTSStatus status, ICancellable cancel, File file) throws ServerErrorException, WMTSException { |
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try {
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WMTSGetTileRequest request = createGetTileRequest(status); |
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request.sendRequest(cancel, file); |
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try {
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checkFileError(file); |
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} catch(WMTSException e) {
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file.delete(); |
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//We can throw an exception if a tile is wrong because the program crashes
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System.err.println("This tile is not available:" + file.getAbsoluteFile().toString()); |
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} catch(IOException e) { |
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file.delete(); |
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//We can throw an exception if a tile is wrong because the program crashes
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System.err.println("This tile is not available:" + file.getAbsoluteFile().toString()); |
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} |
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return file;
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} catch(IOException e) { |
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e.printStackTrace(); |
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throw new ServerErrorException(); |
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} |
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} |
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public synchronized File getTile(WMTSStatus status, ICancellable cancel) throws ServerErrorException, WMTSException { |
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try {
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WMTSGetTileRequest request = createGetTileRequest(status); |
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File f = request.sendRequest(cancel);
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try {
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checkFileError(f); |
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} catch(WMTSException e) {
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downloader.removeURL(request); |
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throw new ServerErrorException(); |
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} |
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return f;
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} catch(IOException e) { |
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e.printStackTrace(); |
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throw new ServerErrorException(); |
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} |
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} |
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/**
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* Checks if the file downloaded is correct or doesn't
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* @param f
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* @throws WMTSException
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* @throws IOException
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*/
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private void checkFileError(File f) throws WMTSException, IOException { |
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if (f == null) |
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return;
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if (Utilities.isTextFile(f)) { |
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byte[] data = fileToBytes(f); |
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String exceptionMessage = parseException(data);
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if (exceptionMessage == null) { |
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String error = new String(data); |
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int pos = error.indexOf("<?xml"); |
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if (pos!= -1) { |
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String xml = error.substring(pos,error.length());
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exceptionMessage = parseException(xml.getBytes()); |
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} |
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if (exceptionMessage == null) |
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exceptionMessage = new String(data); |
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} |
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throw new WMTSException(exceptionMessage); |
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} |
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} |
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public synchronized URL getTileURL(WMTSStatus status) throws MalformedURLException { |
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String onlineResource = getHost();
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String symbol = getSymbol(onlineResource);
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onlineResource = onlineResource + symbol; |
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StringBuffer req = new StringBuffer(); |
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req.append(onlineResource) |
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.append("REQUEST=GetTile&SERVICE=WMTS&VERSION=").append(getVersion()).append("&") |
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.append("Layer=" + status.getLayer())
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.append("&Style=" + status.getStyle())
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.append("&Format=" + status.getFormat())
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.append("&TileMatrixSet=" + status.getTileMatrixSet())
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.append("&TileMatrix=" + status.getTileMatrix())
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.append("&TileRow=" + status. getTileRow())
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.append("&TileCol=" + status.getTileCol());
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return new URL(req.toString()); |
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} |
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/**
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* Gets a file name to download. I
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* @param url
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* @return
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*/
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private File getFile() { |
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count ++; |
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int index = name.lastIndexOf("."); |
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if (index > 0){ |
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return new File(tempDirectoryPath + "/" + name.substring(0,index) + System.currentTimeMillis() + count + |
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name.substring(index, name.length())); |
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} |
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return new File(tempDirectoryPath + "/" + name + System.currentTimeMillis() + count); |
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} |
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public synchronized File downloadFile(URL url, ICancellable cancel) throws DownloadException { |
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File f = null; |
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if((f = getPreviousDownloaded(url)) != null) |
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return f;
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Preferences prefs = Preferences.userRoot().node( "gvsig.downloader" ); |
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int IO_BUFFER_SIZE = 8 * 1024; |
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int timeout = prefs.getInt("timeout", 60000); |
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File dstFile = getFile();
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DataOutputStream dos;
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try {
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DataInputStream is;
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OutputStreamWriter os = null; |
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HttpURLConnection connection = null; |
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if (url.getProtocol().equals("https")) { |
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disableHttsValidation(); |
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} |
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connection = (HttpURLConnection)url.openConnection();
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connection.setConnectTimeout(timeout); |
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is = new DataInputStream(url.openStream()); |
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dos = new DataOutputStream( new BufferedOutputStream(new FileOutputStream(dstFile))); |
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byte[] buffer = new byte[IO_BUFFER_SIZE]; |
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int read;
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while ((read = is.read(buffer)) != -1) { |
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dos.write(buffer, 0, read);
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} |
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if(os != null) { |
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os.close(); |
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} |
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dos.close(); |
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is.close(); |
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is = null;
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dos = null;
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if (cancel != null && cancel.isCanceled()) { |
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dstFile.delete(); |
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dstFile = null;
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return null; |
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} |
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} catch (Exception e) { |
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throw new DownloadException(e); |
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} |
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addDownloadedURL(url, dstFile.getAbsolutePath()); |
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return dstFile;
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} |
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/**
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* This method disables the Https certificate validation.
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* @throws KeyManagementException
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* @throws NoSuchAlgorithmException
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*/
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private void disableHttsValidation() throws KeyManagementException, NoSuchAlgorithmException{ |
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// Create a trust manager that does not validate certificate chains
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TrustManager[] trustAllCerts = new TrustManager[] { |
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new X509TrustManager() { |
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public java.security.cert.X509Certificate[] getAcceptedIssuers() { |
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return null; |
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} |
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public void checkClientTrusted( |
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java.security.cert.X509Certificate[] certs, String authType) { |
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} |
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public void checkServerTrusted( |
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java.security.cert.X509Certificate[] certs, String authType) { |
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} |
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} |
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}; |
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// Install the all-trusting trust manager
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SSLContext sc = SSLContext.getInstance("SSL"); |
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sc.init(null, trustAllCerts, new java.security.SecureRandom()); |
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HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
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} |
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/**
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* <p>It will send a GetFeatureInfo request to the WMTS
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* Parsing the response and redirecting the info to the WMTS client</p>
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* TODO: return a stored file instead a String.
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*/
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public String getFeatureInfo(WMTSStatus status, int x, int y, ICancellable cancel) { |
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StringBuffer output = new StringBuffer(); |
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String outputFormat = new String(); |
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String ServiceException = "ServiceExceptionReport"; |
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StringBuffer sb = new StringBuffer(); |
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sb.append("<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>");
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try {
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WMTSGetFeatureInfoRequest request = createGetFeatureInfoRequest(status, x, y); |
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URL url = request.getURL();
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outputFormat = url.openConnection().getContentType(); |
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File f = request.sendRequest(cancel);
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if (f == null) { |
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return ""; |
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} |
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FileReader fReader = new FileReader(f); |
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char[] buffer = new char[1024*256]; |
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for (int i = fReader.read(buffer); i > 0; i = fReader.read(buffer)) { |
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String str = new String(buffer,0,i); |
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output.append(str); |
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} |
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if ( (outputFormat == null) || (outputFormat.indexOf("xml") != -1) |
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||output.toString().toLowerCase().startsWith("<?xml")
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||(outputFormat.indexOf("gml") != -1)) { |
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KXmlParser kxmlParser = null;
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kxmlParser = new KXmlParser();
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//kxmlParser.setInput(new StringReader(output.toString()));
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kxmlParser.setInput(new FileReader(f)); |
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kxmlParser.nextTag(); |
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if (kxmlParser.getName().compareTo(ServiceException) == 0) { |
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sb.append("<INFO>").append(parseException( output.toString().getBytes())).append("</INFO>"); |
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return sb.toString();
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} else if (kxmlParser.getName().compareToIgnoreCase("ERROR") == 0) { |
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return output.toString();
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} else {
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return output.toString();
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} |
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} else {
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return output.toString();
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} |
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} catch(XmlPullParserException parserEx) {
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if (output.toString().toLowerCase().indexOf("xml") != -1) { |
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return output.toString().trim();
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} else {
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sb.append("<INFO>").append("Info format not supported").append("</INFO>"); |
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return sb.toString();
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} |
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} catch(Exception e) { |
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e.printStackTrace(); |
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sb.append("<INFO>").append("Info format not supported").append("</INFO>"); |
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return sb.toString();
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} |
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} |
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/**
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* <p>Builds a GetCapabilities request that is sent to the WMS
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* the response will be parse to extract the data needed by the
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* WMS client</p>
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* @param override, if true the previous downloaded data will be overridden
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*/
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public void getCapabilities(WMTSServerDescription status, boolean override, ICancellable cancel) { |
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try {
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setServerDescription(status); |
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WMTSGetCapabilitiesRequest request = createGetCapabilitiesRequest(); |
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File f = request.sendRequest(cancel);
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if (f == null) |
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return;
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parseCapabilities(f); |
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} catch(Exception e) { |
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e.printStackTrace(); |
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} |
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} |
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/**
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* Builds the GetCapabilitiesRequest according to the OGC WMS Specifications
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* without a VERSION, to get the highest version than a WMS supports.
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*/
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public static String buildCapabilitiesSuitableVersionRequest(String _host, String _version) { |
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int index = _host.indexOf('?'); |
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if (index > -1) { |
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String host = _host.substring(0, index + 1); |
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String query = _host.substring(index + 1, _host.length()); |
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StringTokenizer tokens = new StringTokenizer(query, "&"); |
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String newQuery = "", token; |
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// If there is a field or a value with spaces, (and then it's on different tokens) -> unify them
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while (tokens.hasMoreTokens()) {
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token = tokens.nextToken().trim(); |
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if (token.toUpperCase().compareTo("REQUEST=GETCAPABILITIES") == 0) |
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continue;
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if (token.toUpperCase().compareTo("SERVICE=WMTS") == 0) |
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continue;
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if ((_version != null) && (_version.length() > 0)) { |
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if (token.toUpperCase().compareTo("VERSION=" + _version) == 0) |
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continue;
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} |
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if (token.toUpperCase().compareTo("EXCEPTIONS=XML") == 0) |
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continue;
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newQuery += token + "&";
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} |
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_host = host + newQuery; |
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} |
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else {
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_host += "?";
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} |
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|
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if ((_version != null) && (_version.compareTo("") != 0)) |
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_host += "REQUEST=GetCapabilities&SERVICE=WMTS&VERSION=" + _version;
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else
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_host += "REQUEST=GetCapabilities&SERVICE=WMTS";
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return _host;
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} |
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|
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/*
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* (non-Javadoc)
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* @see org.gvsig.remoteclient.ogc.OGCProtocolHandler#getServiceInformation()
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*/
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public OGCServiceInformation getServiceInformation() {
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return serviceInfo;
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} |
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protected String parseException(byte[] data) throws IOException { |
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ArrayList errors = new ArrayList(); |
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KXmlParser kxmlParser = new KXmlParser();
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try
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{ |
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kxmlParser.setInput(new ByteArrayInputStream(data), encoding); |
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kxmlParser.nextTag(); |
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int tag;
|
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if ( kxmlParser.getEventType() != KXmlParser.END_DOCUMENT )
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{ |
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kxmlParser.require(KXmlParser.START_TAG, null, ExceptionTags.EXCEPTION_ROOT);
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tag = kxmlParser.nextTag(); |
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while(tag != KXmlParser.END_DOCUMENT)
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{ |
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switch(tag)
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{ |
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case KXmlParser.START_TAG:
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if (kxmlParser.getName().compareTo(ExceptionTags.SERVICE_EXCEPTION)==0){ |
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String errorCode = kxmlParser.getAttributeValue("", ExceptionTags.CODE); |
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errorCode = (errorCode != null) ? "["+errorCode+"] " : ""; |
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String errorMessage = kxmlParser.nextText();
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errors.add(errorCode+errorMessage); |
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} |
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break;
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case KXmlParser.END_TAG:
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break;
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|
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} |
486 |
tag = kxmlParser.nextTag(); |
487 |
} |
488 |
//kxmlParser.require(KXmlParser.END_DOCUMENT, null, null);
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} |
490 |
} |
491 |
catch(XmlPullParserException parser_ex){
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throw new IOException(parser_ex); |
493 |
} |
494 |
|
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String message = errors.size()>0? "" : null; |
496 |
for (int i = 0; i < errors.size(); i++) { |
497 |
message += (String) errors.get(i)+"\n"; |
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} |
499 |
return message;
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} |
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} |