Examples of org.geotools.styling.SelectedChannelType

org.geotools.styling.SelectedChannelType

A class to hold Channel information for use in ChannelSelction objects.

 <xs:complexType name="SelectedChannelType"> <xs:sequence> <xs:element ref="sld:SourceChannelName"/> <xs:element ref="sld:ContrastEnhancement" minOccurs="0"/> </xs:sequence> </xs:complexType> <xs:element name="SourceChannelName" type="xs:string"/>

@author iant @source $URL$

    // the RasterSymbolizer Helper
    rsh = new RasterSymbolizerHelper(gc, null);


    final RasterSymbolizer rsb_1 = sldBuilder.createRasterSymbolizer();
    final ChannelSelection chSel = new ChannelSelectionImpl();
    final SelectedChannelType chTypeGray = new SelectedChannelTypeImpl();
    final ContrastEnhancement cntEnh = new ContrastEnhancementImpl();


    //this will convert to byte!!!
    cntEnh.setMethod(ContrastMethod.HISTOGRAM);
    chTypeGray.setChannelName("1");
    chTypeGray.setContrastEnhancement(cntEnh);
    chSel.setGrayChannel(chTypeGray);
    rsb_1.setChannelSelection(chSel);
    
    // visit the RasterSymbolizer
    rsh.visit(rsb_1);

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    // the RasterSymbolizer Helper
    rsh = new RasterSymbolizerHelper(gc, null);


    final RasterSymbolizer rsb_1 = sldBuilder.createRasterSymbolizer();
    final ChannelSelection chSel = new ChannelSelectionImpl();
    final SelectedChannelType chTypeGray = new SelectedChannelTypeImpl();
    chTypeGray.setChannelName("1");
    chSel.setGrayChannel(chTypeGray);
    rsb_1.setChannelSelection(chSel);
    rsb_1.setOpacity(sldBuilder.literalExpression(1.0));
    final ColorMap cm = sldBuilder.createColorMap(
        new String[] { // labels

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    final RootNode chainSource = new RootNode(source, getHints());
    final BandMergeNode subChainSink = new BandMergeNode(getHints());
    //anchoring the chain for later disposal
    setSink(subChainSink);
    final SelectedChannelType[] rgb=cs.getRGBChannels();
    final SelectedChannelType gray=cs.getGrayChannel();
    // both of them are set?
    if((rgb!=null&&rgb[0]!=null&&rgb[1]!=null&&rgb[2]!=null)&&(gray!=null))
      throw new IllegalArgumentException(Errors.format(
          ErrorKeys.ILLEGAL_ARGUMENT_$1, "Both gray and rgb channel selection are valid!"));
    final SelectedChannelType[] sc = gray==null?rgb:new SelectedChannelType[]{gray};
    
    // If we do not really select any bands from the original coverage, we try to entirely skip this operation
    // this means that either we have to select 1 real band, or we have to select 3 real bands
    // Notice that we also try to be as resilient as possible since 
    if (sc != null && ((sc.length ==1 &&sc[0]!=null)||(sc.length ==3 &&sc[0]!=null&&sc[1]!=null&&sc[2]!=null))) {
      // //
      //
      // Note that we can either select 1 (GRAY) or 3 (RGB) bands.
      //
      // //
      if (sc.length != 3 && sc.length != 1)
        throw new IllegalArgumentException(Errors.format(
            ErrorKeys.BAD_BAND_NUMBER_$1, Integer.valueOf(sc.length)));
      for (int i = 0; i < sc.length; i++) {


        // get the channel element
        final SelectedChannelType channel = sc[i];
        if(LOGGER.isLoggable(Level.FINE))
            LOGGER.fine("Channel "+i+" was "+ channel.getChannelName());
  
        // //
        //
        // BAND SELECTION
        
        //
        // //
        final BandSelectionNode bandSelectionNode = new BandSelectionNode();
        bandSelectionNode.addSource(chainSource);
        bandSelectionNode.visit(channel);


        // //
        //
        // CONTRAST ENHANCEMENT
        //
        // //
        final ContrastEnhancementNode contrastenhancementNode = new ContrastEnhancementNode();
        contrastenhancementNode.addSource(bandSelectionNode);
        bandSelectionNode.addSink(contrastenhancementNode);
        contrastenhancementNode.visit(channel != null ? channel.getContrastEnhancement() : null);


        // //
        //
        // BAND MERGE
        //

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     *
     * @return a new Style instance to render the image in greyscale
     */
    private Style createGreyscaleStyle(int band) {
        ContrastEnhancement ce = sf.contrastEnhancement(ff.literal(1.0), ContrastMethod.NORMALIZE);
        SelectedChannelType sct = sf.createSelectedChannelType(String.valueOf(band), ce);


        RasterSymbolizer sym = sf.getDefaultRasterSymbolizer();
        ChannelSelection sel = sf.channelSelection(sct);
        sym.setChannelSelection(sel);

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    public SelectedChannelType build() {
        if (unset) {
            return null;
        }
        SelectedChannelType selectedChannelType = sf.selectedChannelType(channelName,
                contrastEnhancement.build());
        return selectedChannelType;
    }

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    protected SelectedChannelType copy(SelectedChannelType selectedChannelType) {
        if( selectedChannelType == null ) return null;
        
        ContrastEnhancement enhancement = copy( selectedChannelType.getContrastEnhancement() );
        String name = selectedChannelType.getChannelName();
        SelectedChannelType copy = sf.createSelectedChannelType( name, enhancement);
        
        return copy;
    }

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    }


    public void visit(ChannelSelection cs) {
        //get the channels
        final SelectedChannelType sct[] = copy(cs.getSelectedChannels());
        final ChannelSelection copy = sf.createChannelSelection(sct);
        if (STRICT && !copy.equals(cs)) {
            throw new IllegalStateException("Was unable to duplicate provided ChannelSelection:" + cs);
        }
        pages.push(copy);

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            throw new IllegalStateException("Was unable to duplicate provided OverlapBehavior:" + ob);
        }
    }


    public void visit(SelectedChannelType sct) {
        final SelectedChannelType copy = sf.createSelectedChannelType(sct.getChannelName(), copy(sct.getContrastEnhancement()));
        if (STRICT && !copy.equals(sct)) {
            throw new IllegalStateException("Was unable to duplicate provided SelectedChannelType:" + sct);
        }
        pages.push(copy);
    }

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        Element contrast = document.createElementNS(SLD.NAMESPACE, "ContrastEnhancement");


        document.getDocumentElement().appendChild(name);
        document.getDocumentElement().appendChild(contrast);


        SelectedChannelType channelType = (SelectedChannelType) parse();
        assertNotNull(channelType);
        assertNotNull(channelType.getChannelName());
        assertEquals(channelType.getChannelName(), "SomeName");


        assertNotNull(channelType.getContrastEnhancement());
    }

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    return symbol;
  }


  /** Internal parse method - made protected for unit testing */
  protected SelectedChannelType parseSelectedChannel(Node root) {
    SelectedChannelType symbol = new SelectedChannelTypeImpl();


    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();
      } else if (childName.equalsIgnoreCase("SourceChannelName")) {
        if (child.getFirstChild() != null
            && child.getFirstChild().getNodeType() == Node.TEXT_NODE)
          symbol.setChannelName(getFirstChildValue(child));
      } else if (childName.equalsIgnoreCase("ContrastEnhancement")) {
        symbol.setContrastEnhancement(parseContrastEnhancement(child));


        /*
         * try { if (child.getFirstChild() != null &&
         * child.getFirstChild().getNodeType() == Node.TEXT_NODE)
         * symbol.setContrastEnhancement((Expression) ExpressionBuilder

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