tifffield.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

     * of type TIFF_FLOAT.
     */
    public float[] getAsFloats() {
        return (float[])data;
    }

    /**
     * Returns TIFF_DOUBLE data as an array of doubles. 
     *
     * <p> A ClassCastException will be thrown if the field is not
     * of type TIFF_DOUBLE.
     */
    public double[] getAsDoubles() {
        return (double[])data;
    }

    /**
     * Returns TIFF_SRATIONAL data as an array of 2-element arrays of ints.
     *
     * <p> A ClassCastException will be thrown if the field is not
     * of type TIFF_SRATIONAL.
     */
    public int[][] getAsSRationals() {
        return (int[][])data;
    }

    /**
     * Returns TIFF_RATIONAL data as an array of 2-element arrays of longs.
     *
     * <p> A ClassCastException will be thrown if the field is not
     * of type TIFF_RATTIONAL.
     */
    public long[][] getAsRationals() {
        return (long[][])data;
    }

    /**
     * Returns data in TIFF_BYTE, TIFF_SBYTE, TIFF_UNDEFINED, TIFF_SHORT,
     * TIFF_SSHORT, or TIFF_SLONG format as an int.
     *
     * <p> TIFF_BYTE and TIFF_UNDEFINED data are treated as unsigned;
     * that is, no sign extension will take place and the returned
     * value will be in the range [0, 255].  TIFF_SBYTE data will
     * be returned in the range [-128, 127].
     *
     * <p> A ClassCastException will be thrown if the field is not of
     * type TIFF_BYTE, TIFF_SBYTE, TIFF_UNDEFINED, TIFF_SHORT,
     * TIFF_SSHORT, or TIFF_SLONG.
     */
    public int getAsInt(int index) {
        switch (type) {
        case TIFF_BYTE: case TIFF_UNDEFINED:
            return ((byte[])data)[index] & 0xff;
        case TIFF_SBYTE:
            return ((byte[])data)[index];
        case TIFF_SHORT:
            return ((char[])data)[index] & 0xffff;
        case TIFF_SSHORT:
            return ((short[])data)[index];
        case TIFF_SLONG:
            return ((int[])data)[index];
        default:
            throw new ClassCastException();
        }
    }

    /**
     * Returns data in TIFF_BYTE, TIFF_SBYTE, TIFF_UNDEFINED, TIFF_SHORT,
     * TIFF_SSHORT, TIFF_SLONG, or TIFF_LONG format as a long.
     *
     * <p> TIFF_BYTE and TIFF_UNDEFINED data are treated as unsigned;
     * that is, no sign extension will take place and the returned
     * value will be in the range [0, 255].  TIFF_SBYTE data will
     * be returned in the range [-128, 127].
     *
     * <p> A ClassCastException will be thrown if the field is not of
     * type TIFF_BYTE, TIFF_SBYTE, TIFF_UNDEFINED, TIFF_SHORT,
     * TIFF_SSHORT, TIFF_SLONG, or TIFF_LONG.
     */
    public long getAsLong(int index) {
        switch (type) {
        case TIFF_BYTE: case TIFF_UNDEFINED:
            return ((byte[])data)[index] & 0xff;
        case TIFF_SBYTE:
            return ((byte[])data)[index];
        case TIFF_SHORT:
            return ((char[])data)[index] & 0xffff;
        case TIFF_SSHORT:
            return ((short[])data)[index];
        case TIFF_SLONG:
            return ((int[])data)[index];
        case TIFF_LONG:
            return ((long[])data)[index];
        default:
            throw new ClassCastException();
        }
    }
    
    /**
     * Returns data in any numerical format as a float.  Data in
     * TIFF_SRATIONAL or TIFF_RATIONAL format are evaluated by
     * dividing the numerator into the denominator using
     * double-precision arithmetic and then truncating to single
     * precision.  Data in TIFF_SLONG, TIFF_LONG, or TIFF_DOUBLE
     * format may suffer from truncation.
     *
     * <p> A ClassCastException will be thrown if the field is
     * of type TIFF_UNDEFINED or TIFF_ASCII.
     */
    public float getAsFloat(int index) {
        switch (type) {
        case TIFF_BYTE:
            return ((byte[])data)[index] & 0xff;
        case TIFF_SBYTE:
            return ((byte[])data)[index];
        case TIFF_SHORT:
            return ((char[])data)[index] & 0xffff;
        case TIFF_SSHORT:
            return ((short[])data)[index];
        case TIFF_SLONG:
            return ((int[])data)[index];
        case TIFF_LONG:
            return ((long[])data)[index];
        case TIFF_FLOAT:
            return ((float[])data)[index];
        case TIFF_DOUBLE:
            return (float)((double[])data)[index];
        case TIFF_SRATIONAL:
            int[] ivalue = getAsSRational(index);
            return (float)((double)ivalue[0]/ivalue[1]);
        case TIFF_RATIONAL:
            long[] lvalue = getAsRational(index);
            return (float)((double)lvalue[0]/lvalue[1]);
        default:
            throw new ClassCastException();
        }
    }

    /**
     * Returns data in any numerical format as a float.  Data in
     * TIFF_SRATIONAL or TIFF_RATIONAL format are evaluated by
     * dividing the numerator into the denominator using
     * double-precision arithmetic.
     *
     * <p> A ClassCastException will be thrown if the field is of
     * type TIFF_UNDEFINED or TIFF_ASCII.
     */
    public double getAsDouble(int index) {
        switch (type) {
        case TIFF_BYTE:
            return ((byte[])data)[index] & 0xff;
        case TIFF_SBYTE:
            return ((byte[])data)[index];
        case TIFF_SHORT:
            return ((char[])data)[index] & 0xffff;
        case TIFF_SSHORT:
            return ((short[])data)[index];
        case TIFF_SLONG:
            return ((int[])data)[index];
        case TIFF_LONG:
            return ((long[])data)[index];
        case TIFF_FLOAT:
            return ((float[])data)[index];
        case TIFF_DOUBLE:
            return ((double[])data)[index];
        case TIFF_SRATIONAL:
            int[] ivalue = getAsSRational(index);
            return (double)ivalue[0]/ivalue[1];
        case TIFF_RATIONAL:
            long[] lvalue = getAsRational(index);
            return (double)lvalue[0]/lvalue[1];
        default:
            throw new ClassCastException();
        }
    }

    /**
     * Returns a TIFF_ASCII data item as a String.
     *
     * <p> A ClassCastException will be thrown if the field is not
     * of type TIFF_ASCII.
     */
    public String getAsString(int index) {
        return ((String[])data)[index];
    }

    /**
     * Returns a TIFF_SRATIONAL data item as a two-element array
     * of ints.
     *
     * <p> A ClassCastException will be thrown if the field is not
     * of type TIFF_SRATIONAL.
     */
    public int[] getAsSRational(int index) {
        return ((int[][])data)[index];
    }

    /**
     * Returns a TIFF_RATIONAL data item as a two-element array
     * of ints.
     *
     * <p> A ClassCastException will be thrown if the field is not
     * of type TIFF_RATIONAL.
     */
    public long[] getAsRational(int index) {
        if (type == TIFF_LONG)
            return getAsLongs();
        return ((long[][])data)[index];
    }

    /**
     * Compares this <code>TIFFField</code> with another
     * <code>TIFFField</code> by comparing the tags.
     *
     * <p><b>Note: this class has a natural ordering that is inconsistent
     * with <code>equals()</code>.</b>
     *
     * @throws IllegalArgumentException if the parameter is <code>null</code>.
     * @throws ClassCastException if the parameter is not a
     *         <code>TIFFField</code>.
     */
    public int compareTo(Object o) {
        if(o == null) {
            throw new IllegalArgumentException();
        }

        int oTag = ((TIFFField)o).getTag();

        if(tag < oTag) {
            return -1;
        } else if(tag > oTag) {
            return 1;
        } else {
            return 0;
        }
    }
}