Examples of org.geotools.styling.StyledLayerDescriptor

org.geotools.styling.StyledLayerDescriptor
Holds styling information (from a StyleLayerDescriptor document).
This interface is bound to version 1.0 of the SLD specification.

For many of us in geotools this is the reason we came along for the ride - a pretty picture. For documentation on the use of this class please consult the SLD 1.0 specification.

We may experiment with our own (or SLD 1.1) ideas but will mark such experiments for you. This is only an issue of you are considering writing out these objects for interoptability with other systems.

General stratagy for supporting multiple SLD versions (and experiments):
- These interfaces will reflect the current published specification
- Our implementations will be BIGGER and more capabile then any one specification
- We cannot defined explicit interfaces tracking each version until we move to Java 5 (perferably GeoAPI would hold these anyways)
- We can provided javadocs indicating extentions, and isolate these using the normal java convention: TextSymbolizer and TextSymbolizer2 (In short you will have to go out of your way to work with a hack or experiment, you won't depend on one by accident)
- We can use Factories (aka SLD1Factory and SLD1_1Factory and SEFactory) to support the creation of conformant datastructures. Code (such as user interfaces) can be parameratized with these factories when they need to confirm to an exact version supported by an individual service. We hope that specifications are always adative, and will be forced to throw unsupported exceptions when functionality is removed from a specification.
@author Ian Turton, CCG @author James Macgill, CCG @author Jody Garnett, Refractions Research @source $URL$ @version SLD 1.0 @since GeoTools 2.0

        if ( styleResource.getType() == Type.UNDEFINED ){
            throw new IOException( "No such resource: " + s.getFilename());
        }
        final DefaultResourceLocator locator = new DefaultResourceLocator();
        locator.setSourceUrl(resourceToUrl(styleResource));
        StyledLayerDescriptor sld =
            Styles.handler(s.getFormat()).parse(styleResource, s.getFormatVersion(), locator, null);
        final Style style = Styles.style(sld);
        assert style!=null;
        return style;
    }

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                }
            }
            
        };
        locator.setSourceUrl(resourceToUrl(styleResource));
        final StyledLayerDescriptor sld =
            Styles.handler(s.getFormat()).parse(input, s.getFormatVersion(), locator, null);
        final Style style = Styles.style(sld);
        
        assert style!=null;
        return style;

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      dom = db.parse(source);
      // for our next trick do something with the dom.


      // NodeList nodes = findElements(dom, "StyledLayerDescriptor");


      StyledLayerDescriptor sld = parseDescriptor(dom
          .getDocumentElement());// should only be
                      // one per file
      return sld;


    } catch (javax.xml.parsers.ParserConfigurationException pce) {

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      throw new RuntimeException(ie);
    }
  }


  public StyledLayerDescriptor parseDescriptor(Node root) {
    StyledLayerDescriptor sld = factory.createStyledLayerDescriptor();
    // StyledLayer layer = null;
    // LineSymbolizer symbol = factory.createLineSymbolizer();


    NodeList children = root.getChildNodes();
    final int length = children.getLength();


    for (int i = 0; i < length; i++) {
      Node child = children.item(i);
      if ((child == null) || (child.getNodeType() != Node.ELEMENT_NODE)) {
        continue;
      }
      String childName = child.getLocalName();
      if (childName == null) {
        childName = child.getNodeName();
      }


      if (childName.equalsIgnoreCase("Name")) {
        sld.setName(getFirstChildValue(child));
      } else if (childName.equalsIgnoreCase("Title")) {
        sld.setTitle(getFirstChildValue(child));
      } else if (childName.equalsIgnoreCase("Abstract")) {
        sld.setAbstract(getFirstChildValue(child));
      } else if (childName.equalsIgnoreCase("NamedLayer")) {
        NamedLayer layer = parseNamedLayer(child);
        sld.addStyledLayer(layer);
      } else if (childName.equalsIgnoreCase("UserLayer")) {
        StyledLayer layer = parseUserLayer(child);
        sld.addStyledLayer(layer);
      }
    }


    return sld;
  }

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    @Override
    public Object decode(InputStream input) throws Exception {
        Parser p = new Parser(sldConfiguration);


        // extract the first style in the first sld
        StyledLayerDescriptor sld = (StyledLayerDescriptor) p.parse(input);
        NamedLayer styledLayer = (NamedLayer) sld.getStyledLayers()[0];
        return styledLayer.getStyles()[0];
    }

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    }


    @Override
    public void encode(Object obj, ContentHandler handler) throws Exception {
        StyleFactory sf = CommonFactoryFinder.getStyleFactory(null);
        StyledLayerDescriptor sld = sf.createStyledLayerDescriptor();
        NamedLayer nl = sf.createNamedLayer();
        nl.setName("");
        nl.styles().add((Style) obj);
        sld.setStyledLayers(new StyledLayer[] { nl });


        Encoder e = new Encoder(sldConfiguration);
        e.encode(sld, element, handler);
    }

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    @Override
    public Object decode(Object input) throws Exception {
        Parser p = new Parser(sldConfiguration);


        // extract the first style in the first sld
        StyledLayerDescriptor sld = (StyledLayerDescriptor) p.parse(new StringReader((String) input));
        NamedLayer styledLayer = (NamedLayer) sld.getStyledLayers()[0];
        return styledLayer.getStyles()[0];
    }

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    }


    private Style parseStyle(String styleName) throws IOException {
        SLDParser parser = new SLDParser(CommonFactoryFinder.getStyleFactory());
        parser.setInput(RasterSymbolizerVisitorTest.class.getResource(styleName));
        StyledLayerDescriptor sld = parser.parseSLD();
        NamedLayer ul = (NamedLayer) sld.getStyledLayers()[0];
        return ul.getStyles()[0];
    }

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        if ( request == null ) {
            throw new IllegalArgumentException( "request must be not null" );
        }
        
        GetMapRequest getMap = (GetMapRequest) request;
        StyledLayerDescriptor sld =
            Styles.handler(getMap.getStyleFormat()).parse(reader, getMap.styleVersion(), null, null);


        //process the sld 
        GetMapKvpRequestReader.processStandaloneSld(wms, getMap, sld);

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                    // we should really add a code and a locator...
                    throw new ServiceException("Unknown layer " + layerName);
                }
            }


            StyledLayerDescriptor sld = factory.createStyledLayerDescriptor();
            sld.setStyledLayers((StyledLayer[]) layers.toArray(new StyledLayer[layers.size()]));


            return sld;
        } catch (IOException e) {
            throw new ServiceException(e);
        }

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