svn-gvsig-desktop / tags / v1_0_2_Build_902 / libraries / libRemoteServices / src / org / gvsig / remoteClient / wcs / WCSProtocolHandler.java @ 10681
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2005 IVER T.I. and Generalitat Valenciana.
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*
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* For more information, contact:
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*
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* Generalitat Valenciana
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* Conselleria d'Infraestructures i Transport
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* Av. Blasco Ib??ez, 50
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* 46010 VALENCIA
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* SPAIN
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*
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* +34 963862235
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* gvsig@gva.es
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* www.gvsig.gva.es
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*
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* or
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*
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* IVER T.I. S.A
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* Salamanca 50
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* 46005 Valencia
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* Spain
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*
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* +34 963163400
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* dac@iver.es
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*/
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package org.gvsig.remoteClient.wcs; |
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import java.io.ByteArrayInputStream; |
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import java.io.File; |
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import java.io.FileInputStream; |
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import java.io.IOException; |
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import java.net.URL; |
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import java.nio.ByteBuffer; |
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import java.nio.channels.FileChannel; |
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import java.util.ArrayList; |
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import java.util.HashMap; |
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import java.util.Hashtable; |
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import java.util.Vector; |
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import org.gvsig.remoteClient.OGCProtocolHandler; |
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import org.gvsig.remoteClient.exceptions.ServerErrorException; |
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import org.gvsig.remoteClient.exceptions.WCSException; |
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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.wms.ICancellable; |
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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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*
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* @author jaume
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*
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*/
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public abstract class WCSProtocolHandler 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 Hashtable layerPool = new Hashtable(); |
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/**
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* WCS metadata
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*/
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protected ServiceInformation serviceInfo = new ServiceInformation(); |
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/**
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* <p>
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* Builds a GetCapabilities request that is sent to the WCS
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* the response will be parse to extract the data needed by the
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* WCS client.
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* </p>
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* @param override, if true the cache is ignored
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*/
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public void getCapabilities(WCSStatus status, boolean override, ICancellable cancel) { |
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URL request = null; |
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try {
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request = new URL(buildCapabilitiesRequest(status)); |
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} |
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catch(Exception e) { |
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e.printStackTrace(); |
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} |
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try {
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if (override)
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Utilities.removeURL(request);
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File f = Utilities.downloadFile(request,"wcs_capabilities.xml", cancel); |
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if (f!=null) |
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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 a complete URL-string that can be used to send a GetCapabilities request.
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* @return String
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*/
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private String buildCapabilitiesRequest(WCSStatus status) { |
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StringBuffer req = new StringBuffer(); |
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String symbol = null; |
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String onlineResource;
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if (status == null || status.getOnlineResource() == null) |
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onlineResource = getHost(); |
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else
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onlineResource = status.getOnlineResource(); |
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symbol = getSymbol(onlineResource); |
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req.append(onlineResource).append(symbol).append("REQUEST=GetCapabilities&SERVICE=WCS&");
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req.append("VERSION=").append(getVersion()).append("&EXCEPTIONS=XML"); |
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return req.toString();
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} |
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/**
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* Builds a complete URL-string that can be used to send a DescribeCoverage request.
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* If status is null, then default settings are used.
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* @param WCSStatus
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* @return String
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*/
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private String buildDescribeCoverageRequest(WCSStatus status) { |
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StringBuffer req = new StringBuffer(); |
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String symbol = null; |
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String onlineResource;
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if (status == null || status.getOnlineResource() == null) |
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onlineResource = getHost(); |
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else
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onlineResource = status.getOnlineResource(); |
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symbol = getSymbol(onlineResource); |
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req.append(onlineResource).append(symbol).append("REQUEST=DescribeCoverage&SERVICE=WCS&");
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if (status != null && status.getCoverageName()!= null) |
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req.append("COVERAGE="+status.getCoverageName()+"&"); |
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req.append("VERSION=").append(getVersion()).append("&EXCEPTIONS=XML"); |
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return req.toString();
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} |
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/**
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* parses the data retrieved by the DescribeCoverage XML document
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*/
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public abstract boolean parseDescribeCoverage(File f); |
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/**
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* Send a DescribeCoverage request using the settings passed in the status argument.
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* If status is null, then default settings are used.
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* @param override
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* @return String
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*/
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public void describeCoverage(WCSStatus status, boolean override, ICancellable cancel) { |
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URL request = null; |
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try {
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request = new URL(buildDescribeCoverageRequest(status)); |
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} |
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catch(Exception e) { |
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e.printStackTrace(); |
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} |
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try {
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if (override)
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Utilities.removeURL(request);
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File f = Utilities.downloadFile(request, "wcs_describeCoverage.xml", cancel); |
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if (f!=null) |
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parseDescribeCoverage(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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* Send a GetCoverage request using the settings passed in the status.
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* @return String
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*/
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public File getCoverage(WCSStatus status, ICancellable cancel) throws ServerErrorException, WCSException { |
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URL request = null; |
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try
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{ |
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//TODO:
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//pass this buildXXXRequest to the WCSProtocolHandlerXXX: The request can depend on the WCS version.
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request = new URL(buildCoverageRequest(status)); |
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File f = Utilities.downloadFile(request, "wcsGetCoverage", cancel); |
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if (f!=null && Utilities.isTextFile(f)) { |
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FileInputStream fis = new FileInputStream(f); |
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FileChannel fc = fis.getChannel();
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byte[] data = new byte[(int)fc.size()]; // fc.size returns the size of the file which backs the channel |
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ByteBuffer bb = ByteBuffer.wrap(data); |
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fc.read(bb); |
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WCSException wcsEx = null;
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String exceptionMessage = parseException(data);
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if (exceptionMessage==null) |
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{ |
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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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{ |
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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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wcsEx = new WCSException(exceptionMessage);
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wcsEx.setWCSMessage(new String(data)); |
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// Since it is an error file, It must be deleted from the cache
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Utilities.removeURL(request);
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throw wcsEx;
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} |
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return f;
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} |
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catch(IOException e) |
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{ |
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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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* Parses the WCS Exception document.
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* @param bytes, byte[]
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* @return
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*/
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private String parseException(byte[] data) { |
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// TODO: a?? est? fusilat del WMS, comprovar que funciona.
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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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tag = kxmlParser.nextTag(); |
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} |
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//kxmlParser.require(KXmlParser.END_DOCUMENT, null, null);
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} |
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} |
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catch(XmlPullParserException parser_ex){
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parser_ex.printStackTrace(); |
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} |
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catch (IOException ioe) { |
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ioe.printStackTrace(); |
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} |
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String message = errors.size()>0? "" : null; |
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for (int i = 0; i < errors.size(); i++) { |
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message += (String) errors.get(i)+"\n"; |
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} |
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return message;
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} |
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/**
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* Builds the GetMapRequest according to the OGC WCS Specifications
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*/
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private String buildCoverageRequest(WCSStatus status) |
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{ |
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StringBuffer req = new StringBuffer(); |
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String symbol = null; |
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String onlineResource = null; |
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if (status.getOnlineResource() == null) |
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onlineResource = getHost(); |
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else
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onlineResource = status.getOnlineResource(); |
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symbol = getSymbol(onlineResource); |
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req.append(onlineResource + symbol + "service=WCS&version=").append(getVersion()).append("&request=GetCoverage&"); |
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req.append(getPartialQuery(status)); |
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if (status.getExceptionFormat() != null) { |
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req.append("&EXCEPTIONS=" + status.getExceptionFormat());
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} else {
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req.append("&EXCEPTIONS=XML");
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} |
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return req.toString().replaceAll(" ", "%20"); |
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} |
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/**
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* Gets the part of the OGC request that share GetMap and GetFeatureInfo
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* @return String request
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*/
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public String getPartialQuery(WCSStatus status) |
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{ |
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StringBuffer req = new StringBuffer(); |
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req.append( (status.getTime() != null) ? "TIME="+status.getTime() : "" ) |
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.append( "&COVERAGE=" + status.getCoverageName())
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.append( "&CRS=" + status.getSrs())
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.append( "&FORMAT=" + status.getFormat() )
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.append( "&HEIGHT=" + status.getHeight())
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.append( "&WIDTH=" + status.getWidth())
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.append( (status.getDepth() != null) ? "&DEPTH="+status.getDepth() : "" ) |
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.append( "&BBOX=" + status.getExtent().getMinX()+ "," ) |
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.append( status.getExtent().getMinY()+ ",")
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.append( status.getExtent().getMaxX()+ ",")
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.append( status.getExtent().getMaxY()) |
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.append( (status.getParameters() != null) ? "&"+status.getParameters() : ""); |
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return req.toString();
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} |
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/**
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* Builds the GetCapabilitiesRequest according to the OGC WCS Specifications
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* without a VERSION, to get the highest version than a WCS supports.
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*/
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public static String buildCapabilitiesSuitableVersionRequest(String _host, String _version) { |
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String req = new String(); |
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String symbol = getSymbol(_host);
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req = req + _host + symbol + "REQUEST=GetCapabilities&SERVICE=WCS&";
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if((_version != null) && (_version.length()>0 )) { |
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req += ("&VERSION=" + _version);
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} |
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req += ("&EXCEPTIONS=XML");
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return req.toString().replaceAll(" ", "%20"); |
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} |
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/**
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* Just for not repeat code. Gets the correct separator according to the server URL
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* @param h
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* @return
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*/
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private static String getSymbol(String h) { |
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String symbol;
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if (h.indexOf("?")==-1) |
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symbol = "?";
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else if (h.indexOf("?")!=h.length()-1) |
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symbol = "&";
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else
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symbol = "";
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return symbol;
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} |
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public ArrayList getFormats() { |
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return new ArrayList(serviceInfo.formats); |
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} |
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public class ServiceInformation { |
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public String online_resource = null; |
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public String version; |
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public String name; |
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public String scope; |
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public String title; |
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public String abstr; |
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public String keywords; |
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public String fees; |
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public String operationsInfo; |
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public String personname; |
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public String organization; |
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public String function; |
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public String addresstype; |
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public String address; |
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public String place; |
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public String province; |
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public String postcode; |
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public String country; |
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public String phone; |
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public String fax; |
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public String email; |
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public Vector formats; |
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public HashMap operations; // operations that WCS supports |
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public ServiceInformation()
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{ |
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version = new String(); |
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name = new String(); |
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scope = new String(); |
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title = new String(); |
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abstr = new String(); |
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keywords = new String(); |
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fees = new String(); |
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operationsInfo = new String(); |
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personname = new String(); |
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organization = new String(); |
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function = new String(); |
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addresstype = new String(); |
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address = new String(); |
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place = new String(); |
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province = new String(); |
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postcode = new String(); |
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country = new String(); |
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phone = new String(); |
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fax = new String(); |
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email = new String(); |
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operations = new HashMap(); |
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} |
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} |
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public Hashtable getLayers() { |
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return layerPool;
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} |
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} |