svn-gvsig-desktop / trunk / libraries / libRemoteServices / src / org / gvsig / remoteClient / wms / WMSProtocolHandler.java @ 3521
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package org.gvsig.remoteClient.wms; |
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import java.io.BufferedOutputStream; |
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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.IOException; |
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import java.io.InputStream; |
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import java.io.OutputStream; |
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import java.net.ConnectException; |
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import java.net.URL; |
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import java.net.UnknownHostException; |
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import java.util.TreeMap; |
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import java.util.Vector; |
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import org.gvsig.remoteClient.exceptions.ServerErrorException; |
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import org.gvsig.remoteClient.exceptions.WMSException; |
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import org.gvsig.remoteClient.utils.Utilities; |
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import com.devx.io.TempFileManager; |
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/**
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* <p> Abstract class that represents handlers to comunicate via WMS protocol.
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* </p>
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*
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*/
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public abstract class WMSProtocolHandler { |
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/**
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* procotol handler name
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*/
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protected String name; |
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/**
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* protocol handler version
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*/
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protected String version; |
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/**
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* host of the WMS to connect
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*/
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protected String host; |
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/**
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* port number of the comunication channel of the WMS to connect
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*/
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protected String port; |
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/**
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* WMS metadata
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*/
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protected ServiceInformation serviceInfo;
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public TreeMap layers; |
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public WMSLayer rootLayer;
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public Vector srs; |
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// abstract methods to implement by the handlers that implement
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// the connection to a WMS with certain version.
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// public abstract String getName();
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// public abstract String getVersion();
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/**
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* parses the data retrieved by the WMS in XML format.
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* It will be mostly the WMS Capabilities, but the implementation
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* will be placed in the handler implementing certain version of the protocol.
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*
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*/
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public abstract void parse(File f) ; |
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public String getName() { |
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return name;
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} |
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public String getVersion() { |
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return version;
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} |
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public ServiceInformation getServiceInformation() {
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return serviceInfo;
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} |
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public String getHost () |
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{ |
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return host;
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} |
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public void setHost(String _host) |
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{ |
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host = _host; |
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} |
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public String getPort() |
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{ |
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return port;
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} |
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public void setPort(String _port) |
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{ |
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port = _port; |
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} |
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/**
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* <p>Builds a GetMap request that is sent to the WMS
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* the response (image) will be redirect to the
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* WMS client</p>
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*/
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public byte[] getMap(WMSStatus status) throws ServerErrorException, WMSException |
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{ |
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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 WMSProtocolHandlerXXX: The request can depend on the WMS version.
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request = new URL(buildMapRequest(status)); |
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System.out.println(request.toString());
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byte[] imageBytes = null; |
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byte[] buffer = new byte[1024*256]; |
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InputStream is = request.openStream();
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int readed = 0; |
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for (int i = is.read(buffer); i>0; i = is.read(buffer)){ |
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// Creates a new buffer to contain the previous readed bytes and the next bunch of bytes
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byte[] buffered = new byte[readed+i]; |
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for (int j = 0; j < buffered.length; j++) { |
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if (j<readed){
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// puts the previously downloaded bytes into the image buffer
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buffered[j] = imageBytes[j]; |
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} |
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else {
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// appends the recently downloaded bytes to the image buffer.
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buffered[j] = buffer[j-readed]; |
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} |
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} |
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imageBytes = (byte[]) buffered.clone(); |
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readed += i; |
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} |
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System.out.println(imageBytes);
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if (Utilities.isTextData(imageBytes)){ |
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String exceptionMessage = parseException(imageBytes);
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if (exceptionMessage!=null) |
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throw new WMSException(exceptionMessage); |
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throw new ServerErrorException(); |
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} |
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return imageBytes;
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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 a WMS exception XML document.
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* @param imageBytes
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* @return
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*/
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protected abstract String parseException(byte[] imageBytes) ; |
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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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*/
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public void getCapabilities() |
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{ |
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URL request = null; |
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try
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{ |
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request = new URL(buildCapabilitiesRequest()); |
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} |
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catch(Exception e) |
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{ |
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e.printStackTrace(); |
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} |
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// File f = null;
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// f = new File("tochangethis.txt");
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//
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// if (!f.exists())
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// {
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// try
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// {
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// DataOutputStream dos = new DataOutputStream( new BufferedOutputStream(new FileOutputStream(f)));
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// byte[] buffer = new byte[1024*256];
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// InputStream is = request.openStream();
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// long readed = 0;
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// for (int i = is.read(buffer); i>0; i = is.read(buffer)){
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// dos.write(buffer, 0, i);
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// readed += i;
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// }
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// dos.close();
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// }
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// catch(Exception e)
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// {}
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// }
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try
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{ |
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File f = downloadFile(request,"wms_capabilities.xml"); |
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parse(f); |
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} catch(Exception e) |
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{ |
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//TODO
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e.printStackTrace(); |
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} |
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} |
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/**
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* <p>It will send a GetFeatureInfo request to the WMS
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* Parsing the response and redirecting the info to the WMS client</p>
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*/
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public String getFeatureInfo(WMSStatus status, int x, int y, int featureCount) |
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{ |
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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 WMSProtocolHandlerXXX: The request can depend on the WMS version.
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request = new URL(buildGetFeatureInfoRequest(status, x, y)); |
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} |
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catch(Exception e) |
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{ |
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// TODO something about the exceptionsssss....!!!
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} |
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try
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{ |
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System.out.println(request.toString());
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File f = new File("featureInfo.xml"); |
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DataOutputStream dos = new DataOutputStream(new FileOutputStream(f)); |
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OutputStream bos = null; |
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byte[] buffer = new byte[1024*256]; |
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InputStream is = request.openStream();
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//long readed = 0;
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for (int i = is.read(buffer); i>0; i = is.read(buffer)){ |
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dos.write(buffer, 0, i);
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//readed += i;
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} |
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dos.close(); |
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return null; |
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} |
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catch(Exception e) |
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{ |
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e.printStackTrace(); |
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return null; |
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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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*/
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private String buildCapabilitiesRequest() |
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{ |
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String req = new String(); |
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String host = getHost();
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if ((!host.endsWith("?"))&&(host.indexOf("?")==-1)) |
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req = req + getHost() + "?REQUEST=GetCapabilities&SERVICE=WMS&";
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else
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{ |
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String symbol = (host.endsWith("&")) ? "" : "&"; |
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req = req + getHost() + symbol + "REQUEST=GetCapabilities&SERVICE=WMS&";
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} |
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req = req + "VERSION=" + getVersion();
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req += ("&EXCEPTIONS=XML");
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return req;
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} |
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/**
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* Builds the GetFeatureInfoRequest according to the OGC WMS Specifications
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*/
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private String buildGetFeatureInfoRequest(WMSStatus status, int x, int y) |
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{ |
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String req = new String(); |
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if (!host.endsWith("?")) |
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req = req + getHost() + "?REQUEST=GetFeatureInfo&SERVICE=WMS&";
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else
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req = req + getHost() + "REQUEST=GetFeatureInfo&SERVICE=WMS&";
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req = req + "QUERY_LAYERS="+Utilities.Vector2CS(status.getLayerNames()); |
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req = req + "&VERSION=" + getVersion() + "&"; |
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req = req + getPartialQuery(status); |
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req = req + "&x="+x + "&y="+y; |
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if (status.getExceptionFormat() != null) { |
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req += ("&EXCEPTIONS=" + status.getExceptionFormat());
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} else {
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req += ("&EXCEPTIONS=XML");
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} |
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return req;
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} |
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/**
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* Builds the GetMapRequest according to the OGC WMS Specifications
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*/
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private String buildMapRequest(WMSStatus status) |
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{ |
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String req = new String(); |
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if (!host.endsWith("?")) |
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req = req + getHost() + "?REQUEST=GetMap&SERVICE=WMS&";
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else
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req = req + getHost() + "REQUEST=GetMap&SERVICE=WMS&";
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req = req + "VERSION=" + getVersion() + "&"; |
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req = req + getPartialQuery(status); |
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if (status.getExceptionFormat() != null) { |
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req += ("&EXCEPTIONS=" + status.getExceptionFormat());
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} else {
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req += ("&EXCEPTIONS=XML");
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} |
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return req;
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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(WMSStatus status) |
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{ |
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String req = "LAYERS=" + Utilities.Vector2CS(status.getLayerNames()) + "&STYLES=" + |
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Utilities.Vector2CS(status.getStyles()) + "&SRS=" + status.getSrs() + |
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"&BBOX=" + status.getExtent().getMinX()+ "," + |
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status.getExtent().getMinY()+ "," +
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status.getExtent().getMaxX()+ "," +
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status.getExtent().getMaxY() + |
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"&WIDTH=" + status.getWidth() +
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"&HEIGHT=" + status.getHeight() + "&FORMAT=" + status.getFormat(); |
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// if (status.getTransparency()) {
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// req += "&TRANSPARENT=TRUE";
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// }
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//
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// if (status.getBGColor() != null) {
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// req += ("&COLOR=" + status.getBGColor());
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// }
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//
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// if (time != null) {
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// req += ("&TIME=" + time);
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// }
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//
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// if (elevation != -1) {
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// req += ("&ELEVATION=" + elevation);
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// }
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return req.replaceAll(" ", "%20"); |
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} |
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public void close() { |
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// your code here
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} |
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/**
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* Inner class that represents the description of the WMS metadata.
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* The first part of the capabilities will return the service information
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* from the WMS, this class will hold this information.
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*
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*/
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public class ServiceInformation { |
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public String online_resource; |
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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 ServiceInformation()
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{ |
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online_resource = new String(); |
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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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formats = new Vector(); |
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} |
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} |
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/**
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* Downloads an URL into a temporary file that is removed the next time the
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* tempFileManager class is called, which means the next time gvSIG is launched.
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*
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* @param url
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* @param name
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* @return
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* @throws IOException
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* @throws ServerErrorResponseException
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* @throws ConnectException
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* @throws UnknownHostException
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*/
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private File downloadFile(URL url, String name) throws IOException,ConnectException, UnknownHostException{ |
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File f = null; |
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try{
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if ((f=Utilities.getPreviousDownloadedURL(url))==null){ |
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f = TempFileManager.createTempFile(name, "tmp");
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System.out.println("downloading '"+url.toString()+"' to: "+f.getAbsolutePath()); |
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f.deleteOnExit(); |
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DataOutputStream dos = new DataOutputStream( new BufferedOutputStream(new FileOutputStream(f))); |
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byte[] buffer = new byte[1024*256]; |
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InputStream is = url.openStream();
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long readed = 0; |
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for (int i = is.read(buffer); i>0; i = is.read(buffer)){ |
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dos.write(buffer, 0, i);
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readed += i; |
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} |
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dos.close(); |
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Utilities.addDownloadedURL(url, f.getAbsolutePath());
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} |
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} catch (IOException io) { |
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io.printStackTrace(); |
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} |
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return f;
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} |
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} |