1 2 /* ==================================================================== 3 * The Apache Software License, Version 1.1 4 * 5 * Copyright (c) 2002 The Apache Software Foundation. All rights 6 * reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. The end-user documentation included with the redistribution, 21 * if any, must include the following acknowledgment: 22 * "This product includes software developed by the 23 * Apache Software Foundation (http://www.apache.org/)." 24 * Alternately, this acknowledgment may appear in the software itself, 25 * if and wherever such third-party acknowledgments normally appear. 26 * 27 * 4. The names "Apache" and "Apache Software Foundation" and 28 * "Apache POI" must not be used to endorse or promote products 29 * derived from this software without prior written permission. For 30 * written permission, please contact apache@apache.org. 31 * 32 * 5. Products derived from this software may not be called "Apache", 33 * "Apache POI", nor may "Apache" appear in their name, without 34 * prior written permission of the Apache Software Foundation. 35 * 36 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 37 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 38 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 39 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 42 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 43 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 44 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 45 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 46 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 47 * SUCH DAMAGE. 48 * ==================================================================== 49 * 50 * This software consists of voluntary contributions made by many 51 * individuals on behalf of the Apache Software Foundation. For more 52 * information on the Apache Software Foundation, please see 53 * <http://www.apache.org/>. 54 */ 55 56 package org.apache.poi.hssf.record; 57 58 import org.apache.poi.util.LittleEndian; 59 60 /** 61 * Title: Delta Record<P> 62 * Description: controls the accuracy of the calculations<P> 63 * REFERENCE: PG 303 Microsoft Excel 97 Developer's Kit (ISBN: 1-57231-498-2)<P> 64 * @author Andrew C. Oliver (acoliver at apache dot org) 65 * @version 2.0-pre 66 */ 67 68 public class DeltaRecord 69 extends Record 70 { 71 public final static short sid = 0x10; 72 public final static double DEFAULT_VALUE = 0.0010; // should be .001 73 74 // a double is an IEEE 8-byte float...damn IEEE and their goofy standards an 75 // ambiguous numeric identifiers 76 private double field_1_max_change; 77 78 public DeltaRecord() 79 { 80 } 81 82 /** 83 * Constructs a Delta record and sets its fields appropriately. 84 * 85 * @param id id must be 0x10 or an exception will be throw upon validation 86 * @param size the size of the data area of the record 87 * @param data data of the record (should not contain sid/len) 88 */ 89 90 public DeltaRecord(short id, short size, byte [] data) 91 { 92 super(id, size, data); 93 } 94 95 /** 96 * Constructs a Delta record and sets its fields appropriately. 97 * 98 * @param id id must be 0x10 or an exception will be throw upon validation 99 * @param size the size of the data area of the record 100 * @param data data of the record (should not contain sid/len) 101 * @param offset of record data 102 */ 103 104 public DeltaRecord(short id, short size, byte [] data, int offset) 105 { 106 super(id, size, data, offset); 107 } 108 109 protected void validateSid(short id) 110 { 111 if (id != sid) 112 { 113 throw new RecordFormatException("NOT A DELTA RECORD"); 114 } 115 } 116 117 protected void fillFields(byte [] data, short size, int offset) 118 { 119 field_1_max_change = LittleEndian.getDouble(data, 0 + offset); 120 } 121 122 /** 123 * set the maximum change 124 * @param maxChange - maximum rounding error 125 */ 126 127 public void setMaxChange(double maxChange) 128 { 129 field_1_max_change = maxChange; 130 } 131 132 /** 133 * get the maximum change 134 * @return maxChange - maximum rounding error 135 */ 136 137 public double getMaxChange() 138 { 139 return field_1_max_change; 140 } 141 142 public String toString() 143 { 144 StringBuffer buffer = new StringBuffer(); 145 146 buffer.append("[DELTA]\n"); 147 buffer.append(" .maxchange = ").append(getMaxChange()) 148 .append("\n"); 149 buffer.append("[/DELTA]\n"); 150 return buffer.toString(); 151 } 152 153 public int serialize(int offset, byte [] data) 154 { 155 LittleEndian.putShort(data, 0 + offset, sid); 156 LittleEndian.putShort(data, 2 + offset, ( short ) 0x8); 157 LittleEndian.putDouble(data, 4 + offset, getMaxChange()); 158 return getRecordSize(); 159 } 160 161 public int getRecordSize() 162 { 163 return 12; 164 } 165 166 public short getSid() 167 { 168 return this.sid; 169 } 170 } 171