rpfattributes.java

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

                    break;
                case 16:
                    if ((int) attributeOffsetRecord.parameterId == 1)
                        eMagChange = binFile.readFloat();
                    else if ((int) attributeOffsetRecord.parameterId == 2)
                        eMagChangeUnits = (int) binFile.readShort(); // ushort
                    break;
                case 17:
                    if ((int) attributeOffsetRecord.parameterId == 1)
                        wMagChange = binFile.readFloat();
                    else if ((int) attributeOffsetRecord.parameterId == 2)
                        wMagChangeUnits = (int) binFile.readShort(); // ushort
                    break;
                case 18:
                    if ((int) attributeOffsetRecord.parameterId == 1)
                        magAngle = binFile.readFloat();
                    else if ((int) attributeOffsetRecord.parameterId == 2)
                        magAngleUnits = (int) binFile.readShort(); // ushort
                    break;
                case 19:
                    if ((int) attributeOffsetRecord.parameterId == 1)
                        gridConver = binFile.readFloat();
                    else if ((int) attributeOffsetRecord.parameterId == 2)
                        gridConverUnits = (int) binFile.readShort(); // ushort
                    break;
                case 20:
                    if ((int) attributeOffsetRecord.parameterId == 1)
                        highElevation = binFile.readDouble();
                    else if ((int) attributeOffsetRecord.parameterId == 2)
                        highElevationUnits = (int) binFile.readShort(); // ushort
                    else if ((int) attributeOffsetRecord.parameterId == 3)
                        highLat = binFile.readDouble();
                    else if ((int) attributeOffsetRecord.parameterId == 4)
                        highLon = binFile.readDouble();
                    break;
                case 21:
                    legendFileName = binFile.readFixedLengthString(12); // [12];
                    break;
                case 22:
                    if ((int) attributeOffsetRecord.parameterId == 1)
                        dataSource = binFile.readFixedLengthString(12); // [12];
                    else if ((int) attributeOffsetRecord.parameterId == 2)
                        gsd = (long) binFile.readInteger(); // uint
                    break;
                case 23:
                    dataLevel = (int) binFile.readShort(); // ushort
                    break;
                }
                i--;
            }

        } catch (IOException e) {
            Debug.error("RpfAttributes: read(): File IO Error!\n" + e);
            return false;
        } catch (FormatException f) {
            Debug.error("RpfAttributes: read(): File IO Format error!\n" + f);
            return false;
        }

        return true;
    }

    public String toString() {
        StringBuffer s = new StringBuffer();
        s.append("Attribute Section:\n");
        s.append(" currency date = " + currencyDate + "\n");
        s.append(" production date = " + productionDate + "\n");
        s.append(" significant date = " + significantDate + "\n");
        s.append(" chart series code = " + chartSeriesCode + "\n");
        s.append(" map designation code = " + mapDesignationCode + "\n");
        s.append(" old horizontal datum = " + oldHorDatum + "\n");
        s.append(" edition = " + edition + "\n");
        s.append(" projection code = " + projectionCode + "\n");
        s.append(" projection A = " + projectionA + "\n");
        s.append(" projection B = " + projectionB + "\n");
        s.append(" projection C = " + projectionC + "\n");
        s.append(" projection D = " + projectionD + "\n");
        s.append(" vertical datum code = " + vertDatumCode + "\n");
        s.append(" horizontal datum code = " + horDatumCode + "\n");
        s.append(" vertical absolute accuracy = " + vertAbsAccuracy + "\n");
        s.append(" vertical absolute units = " + vertAbsUnits + "\n");
        s.append(" horizontal absolute accuracy = " + horAbsAccuracy + "\n");
        s.append(" horizontal absolute units = " + horAbsUnits + "\n");
        s.append(" vertical relative accuracy = " + vertRelAccuracy + "\n");
        s.append(" vertical relative units = " + vertRelUnits + "\n");
        s.append(" horizontal relative accuracy = " + horRelAccuracy + "\n");
        s.append(" horizontal relative units = " + horRelUnits + "\n");
        s.append(" ellipoid code = " + ellipsoidCode + "\n");
        s.append(" sounding datum code = " + soundingDatumCode + "\n");
        s.append(" nav system code = " + navSystemCode + "\n");
        s.append(" grid code = " + gridCode + "\n");
        s.append(" east mag change = " + eMagChange + "\n");
        s.append(" east mag change units = " + eMagChangeUnits + "\n");
        s.append(" west mag change = " + wMagChange + "\n");
        s.append(" west mag units = " + wMagChangeUnits + "\n");
        s.append(" magnetic angle = " + magAngle + "\n");
        s.append(" magnetic angle units = " + magAngleUnits + "\n");
        s.append(" grid conversion = " + gridConver + "\n");
        s.append(" grid conversion units = " + gridConverUnits + "\n");
        s.append(" high elevation = " + highElevation + "\n");
        s.append(" high elevation units = " + highElevationUnits + "\n");
        s.append(" high latitude = " + highLat + "\n");
        s.append(" high longitude = " + highLon + "\n");
        s.append(" legend file name = " + legendFileName + "\n");
        s.append(" data source = " + dataSource + "\n");
        s.append(" gsd = " + gsd + "\n");
        s.append(" data level = " + dataLevel + "\n");
        return s.toString();
    }

    /**
     * Get the attributes from within a RPF Frame file. Returns null
     * if something goes wrong. You do need to make sure that the
     * Debug class is initialized before calling this class. For
     * OpenMap, it usually is.
     * 
     * @param filename the file path for the RPF frame file.
     * @return a RpfAttributes object.
     */
    public static RpfAttributes getAttributes(String filename)
            throws IOException, FileNotFoundException {

        BinaryFile binFile = new BinaryBufferedFile(filename);

        RpfHeader head = new RpfHeader();
        head.read(binFile);

        RpfAttributes att = getAttributes(binFile);
        binFile.close();
        head = null;
        return att;
    }

    /**
     * Get the attributes from within a RPF Frame file, after the
     * header has been read. Returns null if something goes wrong. You
     * do need to make sure that the Debug class is initialized before
     * calling this class. For OpenMap, it usually is.
     * 
     * @param binFile BinaryFile.
     * @return a RpfAttributes object.
     */
    public static RpfAttributes getAttributes(BinaryFile binFile)
            throws IOException, FileNotFoundException {
        RpfFileSections rfs = new RpfFileSections(binFile);
        RpfAttributes att = rfs.parseAttributes(binFile);
        return att;
    }

    public static void main(String[] args) {
        if (args.length != 1) {
            System.out.println("Usage: java RpfAttributes <path to RPF frame>");
            return;
        }

        Debug.init(System.getProperties());
        try {
            RpfAttributes att = RpfAttributes.getAttributes(args[0]);
            Debug.output(att.toString());
        } catch (FileNotFoundException e) {
            Debug.error("RpfAttributes: file " + args[0] + " not found");
        } catch (IOException ioe) {
            Debug.error("RpfAttributes: File IO Error while handling attributes: \n"
                    + ioe);
        }
    }

    static public class AttributeSubheader {
        int numAttributes; //ushort
        int numArealRecords; // ushort
        long tableOffset; // ulong
        int offsetRecordLength; // ushort

        public void read(BinaryFile binFile) {
            try {
                numAttributes = (int) binFile.readShort();
                numArealRecords = (int) binFile.readShort();
                tableOffset = (long) binFile.readInteger();
                offsetRecordLength = (int) binFile.readShort();
            } catch (IOException e) {
                Debug.error("AttributeSubheader: read(): File IO Error!\n" + e);
            } catch (FormatException f) {
                Debug.error("AttributeSubheader: read(): File IO Format error!\n"
                        + f);
            }

        }

        public String toString() {
            StringBuffer s = new StringBuffer();
            s.append("## RPF ATTRIBUTE INFORMATION\n");
            s.append("Number of Attributes - " + numAttributes + "\n");
            s.append("Number of Areal Records - " + numArealRecords + "\n");
            s.append("Size of offset - " + tableOffset + "\n");
            s.append("Record Length - " + offsetRecordLength + "\n");
            return s.toString();
        }
    }

    static public class AttributeOffsetRecord {
        int attributeId; // ushort
        int parameterId; //char
        int sequenceNum; //char
        long offset; //ulong

        public void read(BinaryFile binFile) {
            try {
                attributeId = (int) binFile.readShort();
                parameterId = binFile.read();
                sequenceNum = binFile.read();
                offset = (long) binFile.readInteger();
            } catch (IOException e) {
                Debug.error("AttributeOffsetRecord: read(): File IO Error!\n"
                        + e);
            } catch (FormatException f) {
                Debug.error("AttributeOffsetRecord: read(): File IO Format error!\n"
                        + f);
            }
        }
    }
}