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* Description: controls the accuracy of the calculations
* REFERENCE: PG 303 Microsoft Excel 97 Developer's Kit (ISBN: 1-57231-498-2)
* @author Andrew C. Oliver (acoliver at apache dot org) * @version 2.0-pre */ public class DeltaRecord extends Record { public final static short sid = 0x10; public final static double DEFAULT_VALUE = 0.0010; // should be .001 // a double is an IEEE 8-byte float...damn IEEE and their goofy standards an // ambiguous numeric identifiers private double field_1_max_change; public DeltaRecord() { } /** * Constructs a Delta record and sets its fields appropriately. * * @param id id must be 0x10 or an exception will be throw upon validation * @param size the size of the data area of the record * @param data data of the record (should not contain sid/len) */ public DeltaRecord(short id, short size, byte [] data) { super(id, size, data); } /** * Constructs a Delta record and sets its fields appropriately. * * @param id id must be 0x10 or an exception will be throw upon validation * @param size the size of the data area of the record * @param data data of the record (should not contain sid/len) * @param offset of record data */ public DeltaRecord(short id, short size, byte [] data, int offset) { super(id, size, data, offset); } protected void validateSid(short id) { if (id != sid) { throw new RecordFormatException("NOT A DELTA RECORD"); } } protected void fillFields(byte [] data, short size, int offset) { field_1_max_change = LittleEndian.getDouble(data, 0 + offset); } /** * set the maximum change * @param maxChange - maximum rounding error */ public void setMaxChange(double maxChange) { field_1_max_change = maxChange; } /** * get the maximum change * @return maxChange - maximum rounding error */ public double getMaxChange() { return field_1_max_change; } public String toString() { StringBuffer buffer = new StringBuffer(); buffer.append("[DELTA]\n"); buffer.append(" .maxchange = ").append(getMaxChange()) .append("\n"); buffer.append("[/DELTA]\n"); return buffer.toString(); } public int serialize(int offset, byte [] data) { LittleEndian.putShort(data, 0 + offset, sid); LittleEndian.putShort(data, 2 + offset, ( short ) 0x8); LittleEndian.putDouble(data, 4 + offset, getMaxChange()); return getRecordSize(); } public int getRecordSize() { return 12; } public short getSid() { return this.sid; } }