getmapxmlreader.java

电子地图服务器,搭建自己的地图服务

            }
        }

        getMapRequest.setLayers((MapLayerInfo[]) layers.toArray(new MapLayerInfo[layers.size()]));
        getMapRequest.setStyles(styles);
    }

    /**
     * xs:element name="BoundingBox" type="gml:BoxType"/> dont forget the SRS!
     *
     * @param getMapRequest
     * @param nodeGetMap
     *
     * @throws Exception DOCUMENT ME!
     */
    private void parseBBox(GetMapRequest getMapRequest, Node nodeGetMap)
        throws Exception {
        Node bboxNode = getNode(nodeGetMap, "BoundingBox");

        if (bboxNode == null) {
            throw new Exception("GetMap XML parser - couldnt find node 'BoundingBox' in GetMap tag");
        }

        List coordList = ExpressionDOMParser.parseCoords(bboxNode);

        if (coordList.size() != 2) {
            throw new Exception(
                "GetMap XML parser - node 'BoundingBox' in GetMap tag should have 2 coordinates in it");
        }

        com.vividsolutions.jts.geom.Envelope env = new com.vividsolutions.jts.geom.Envelope();
        final int size = coordList.size();

        for (int i = 0; i < size; i++) {
            env.expandToInclude((Coordinate) coordList.get(i));
        }

        getMapRequest.setBbox(env);

        // SRS
        NamedNodeMap atts = bboxNode.getAttributes();
        Node srsNode = atts.getNamedItem("srsName");

        if (srsNode != null) {
            String srs = srsNode.getNodeValue();
            String epsgCode = srs.substring(srs.indexOf('#') + 1);
            epsgCode = "EPSG:" + epsgCode;

            try {
                CoordinateReferenceSystem mapcrs = CRS.decode(epsgCode);
                getMapRequest.setCrs(mapcrs);
                getMapRequest.setSRS(epsgCode);
            } catch (Exception e) {
                //couldnt make it - we send off a service exception with the correct info
                throw new WmsException(e.getLocalizedMessage(), "InvalidSRS");
            }
        }
    }

    //J--
    /**
     *
     * <xs:element name="Format" type="ogc:FormatType"/>
     * <xs:element name="Transparent" type="xs:boolean" minOccurs="0"/>
     * <xs:element name="BGcolor" type="xs:string" minOccurs="0"/>
     * <xs:element name="Size">
     *         <xs:complexType>
     *         <xs:sequence>
     *                 <xs:element name="Width" type="xs:positiveInteger"/>
     *                 <xs:element name="Height" type="xs:positiveInteger"/>
     *         </xs:sequence>
     *         </xs:complexType>
    *  <xs:element name="Buffer" type="xs:integer" minOccurs="0"/>
     * </xs:element><!--Size-->
     *
     * @param nodeGetMap
     * @param getMapRequest
     */

    //J+
    private void parseXMLOutput(Node nodeGetMap, GetMapRequest getMapRequest)
        throws Exception {
        Node outputNode = getNode(nodeGetMap, "Output");

        if (outputNode == null) {
            throw new Exception("GetMap XML parser - couldnt find node 'Output' in GetMap tag");
        }

        //Format
        String format = getNodeValue(outputNode, "Format");

        if (format == null) {
            throw new Exception(
                "GetMap XML parser - couldnt find node 'Format' in GetMap/Output tag");
        }

        getMapRequest.setFormat(format);

        // Transparent
        String trans = getNodeValue(outputNode, "Transparent");

        if (trans != null) {
            if (trans.equalsIgnoreCase("false") || trans.equalsIgnoreCase("0")) {
                getMapRequest.setTransparent(false);
            } else {
                getMapRequest.setTransparent(true);
            }
        }

        // Buffer
        String bufferValue = getNodeValue(outputNode, "Buffer");

        if (bufferValue != null) {
            getMapRequest.setBuffer(Integer.parseInt(bufferValue));
        }

        //BGColor
        String bgColor = getNodeValue(outputNode, "BGcolor");

        if (bgColor != null) {
            getMapRequest.setBgColor(Color.decode(bgColor));
        }

        //SIZE
        Node sizeNode = getNode(outputNode, "Size");

        if (sizeNode == null) {
            throw new Exception("GetMap XML parser - couldnt find node 'Size' in GetMap/Output tag");
        }

        //Size/Width
        String width = getNodeValue(sizeNode, "Width");

        if (width == null) {
            throw new Exception(
                "GetMap XML parser - couldnt find node 'Width' in GetMap/Output/Size tag");
        }

        getMapRequest.setWidth(Integer.parseInt(width));

        //Size/Height
        String height = getNodeValue(sizeNode, "Height");

        if (width == null) {
            throw new Exception(
                "GetMap XML parser - couldnt find node 'Height' in GetMap/Output/Size tag");
        }

        getMapRequest.setHeight(Integer.parseInt(height));
    }

    /**
     * Give a node and the name of a child of that node, return it. This doesnt
     * do anything complex.
     *
     * @param parentNode
     * @param wantedChildName
     *
     * @return
     */
    public Node getNode(Node parentNode, String wantedChildName) {
        NodeList children = parentNode.getChildNodes();

        for (int i = 0; i < children.getLength(); 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(wantedChildName)) {
                return child;
            }
        }

        return null;
    }

    /**
     * Give a node and the name of a child of that node, find its (string)
     * value. This doesnt do anything complex.
     *
     * @param parentNode
     * @param wantedChildName
     *
     * @return
     */
    public String getNodeValue(Node parentNode, String wantedChildName) {
        NodeList children = parentNode.getChildNodes();

        for (int i = 0; i < children.getLength(); 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(wantedChildName)) {
                return child.getChildNodes().item(0).getNodeValue();
            }
        }

        return null;
    }

    /**
     * returns true if this node is named "name".  Ignores case and namespaces.
     *
     * @param n
     * @param name
     *
     * @return
     */
    public boolean nodeNameEqual(Node n, String name) {
        if (n.getNodeName().equalsIgnoreCase(name)) {
            return true;
        }

        String nname = n.getNodeName();
        int idx = nname.indexOf(':');

        if (idx == -1) {
            return false;
        }

        if (nname.substring(idx + 1).equalsIgnoreCase(name)) {
            return true;
        }

        return false;
    }

    /**
     * This should only be called if the xml starts with StyledLayerDescriptor
     * Don't use on a GetMap.
     *
     * @param f
     * @param getMapRequest
     *
     * @throws Exception
     * @throws WmsException DOCUMENT ME!
     */
    public void validateSchemaSLD(File f, GetMapRequest getMapRequest)
        throws Exception {
        SLDValidator validator = new SLDValidator();
        List errors = null;

        try {
            FileInputStream in = null;

            try {
                in = new FileInputStream(f);
                errors = validator.validateSLD(in,
                        getMapRequest.getHttpServletRequest().getSession().getServletContext());
            } finally {
                if (in != null) {
                    in.close();
                }
            }

            if (errors.size() != 0) {
                in = new FileInputStream(f);
                throw new WmsException(SLDValidator.getErrorMessage(in, errors));
            }
        } catch (IOException e) {
            String msg = new StringBuffer("Creating remote SLD url: ").append(e.getMessage())
                                                                      .toString();

            if (LOGGER.isLoggable(Level.WARNING)) {
                LOGGER.log(Level.WARNING, msg, e);
            }

            throw new WmsException(e, msg, "parseSldParam");
        }
    }

    /**
     * This should only be called if the xml starts with GetMap Don't use on a
     * SLD.
     *
     * @param f
     * @param getMapRequest
     *
     * @throws Exception
     * @throws WmsException DOCUMENT ME!
     */
    public void validateSchemaGETMAP(File f, GetMapRequest getMapRequest)
        throws Exception {
        GETMAPValidator validator = new GETMAPValidator();
        List errors = null;

        try {
            FileInputStream in = null;

            try {
                in = new FileInputStream(f);
                errors = validator.validateGETMAP(in,
                        getMapRequest.getHttpServletRequest().getSession().getServletContext());
            } finally {
                if (in != null) {
                    in.close();
                }
            }

            if (errors.size() != 0) {
                in = new FileInputStream(f);
                throw new WmsException(GETMAPValidator.getErrorMessage(in, errors));
            }
        } catch (IOException e) {
            String msg = new StringBuffer("Creating remote GETMAP url: ").append(e.getMessage())
                                                                         .toString();

            if (LOGGER.isLoggable(Level.WARNING)) {
                LOGGER.log(Level.WARNING, msg, e);
            }

            throw new WmsException(e, msg, "GETMAP validator");
        }
    }

    /**
     * DOCUMENT ME!
     *
     * @param request
     *
     * @return
     */
    private boolean wantToValidate(HttpServletRequest request) {
        String queryString = request.getQueryString(); // ie.   FORMAT=image/png&TRANSPARENT=TRUE&HEIGHT=480&REQUEST=GetMap&BBOX=-73.94896388053894,40.77323718492597,-73.94105110168456,40.77796711500081&WIDTH=803&SRS=EPSG:4326&VERSION=1.1.1	

        if (queryString == null) {
            return false; // pure POST without any query
        }

        queryString = queryString.toLowerCase();

        if (queryString.startsWith("validateschema")
                || (queryString.indexOf("&validateschema") != -1)) {
            return true;
        }

        return false;
    }
}