[mapguide-users] Help regarding to set filter for a layer programmatically using Java

Thu Aug 13 02:10:12 EDT 2009

Hi,
  I would like thank you all for your kind help and time. I am also sorry
for replying to the so late. I am posting the entire java code that i
used.
Thanks
Jai Mansukhani

__________________________
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ page import="org.osgeo.mapguide.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.lang.Object.*"%>
<%@ include file="common/common.jsp" %>
<%@ page import="javax.xml.parsers.*"%>
<%@ page import="org.xml.sax.*"%>
<%@ page import="java.io.StringReader"%>
<%@ page import="org.w3c.dom.*"%>
<%@ page import="javax.xml.transform.*"%>
<%@ page import="javax.xml.transform.dom.*"%>
<%@ page import="javax.xml.transform.stream.*"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">

<%@page import="java.sql.Timestamp"%>
<%@page import="java.sql.Time"%><html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<%

String sessionId = request.getParameter("SESSION");
String mapName = request.getParameter("MAPNAME");

try {
	// Initialize the Web Extensions and connect to the Server using
	// the Web Extensions session identifier stored in PHP
	// session state.

	MapGuideJavaApi.MgInitializeWebTier(webconfigFilePath);

	// Get the user information using the session id,
	// and set up a connection to the site server.

	MgUserInformation userInfo = new MgUserInformation(sessionId);
	MgSiteConnection siteConnection = new MgSiteConnection();
	siteConnection.Open(userInfo);

	// Get an instance of the required service(s).

	MgResourceService resService = (MgResourceService)
siteConnection.CreateService(MgServiceType.ResourceService);

	MgMap map = new MgMap();

	System.out.println("layers ");
	map.Open(resService, mapName);

	MgLayerCollection layerCollection = map.GetLayers();

	MgResourceIdentifier layerResourceId = new
MgResourceIdentifier("Library://Samples/Sheboygan/Layers/filter_test.LayerDefinition");//layer.GetLayerDefinition();

	MgByteReader mdReader = resService.GetResourceContent(layerResourceId);

	String mdXml = mdReader.ToString();

	DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

	DocumentBuilder builder = factory.newDocumentBuilder();

	org.w3c.dom.Document mdDomDoc = builder.parse(new InputSource(new
StringReader(mdXml)));

	NodeList nodeList = mdDomDoc.getElementsByTagName("Filter");
	int size = nodeList.getLength();

	Node node = nodeList.item(0);

	Element e = (Element) node;

	String layerDefinition = "";

	try {
		DOMSource domSource = new DOMSource(mdDomDoc);
		java.io.StringWriter writer = new java.io.StringWriter();
		StreamResult result = new StreamResult(writer);
		TransformerFactory tf = TransformerFactory.newInstance();
		Transformer transformer = tf.newTransformer();
		transformer.transform(domSource, result);
		layerDefinition = writer.toString();
	} catch (TransformerException ex) {
		ex.printStackTrace();

	}

	MgLayerCollection newlayerCollection = map.GetLayers();

	MgByteSource byteSource = new
MgByteSource(layerDefinition.getBytes(),layerDefinition.length());
	byteSource.SetMimeType( MgMimeType.Xml);

	MgResourceIdentifier resId = new
MgResourceIdentifier("Session:"+sessionId+"//Samples/Sheboygan/Layers/new_filter_test.LayerDefinition");

	resService.SetResource(resId,byteSource.GetReader(),null);

	MgLayer newLayer = new MgLayer(resId,resService);

	newLayer.SetName("New Filter Layer");
	newLayer.SetVisible(true);
	newLayer.SetDisplayInLegend(true);
	newLayer.SetLegendLabel("New Filter Layer");

	newlayerCollection.Insert(0,newLayer);

	map.Save(resService);

}
catch ( MgException e){
	System.out.println(e.GetDetails());
	e.printStackTrace();
}
%>

<body onload="parent.Refresh();">

</body>
</html>