234 lines
6.7 KiB
Java
234 lines
6.7 KiB
Java
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2003 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache POI" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache POI", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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package org.apache.poi.hssf.record;
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/**
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* Title: Record
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* Description: All HSSF Records inherit from this class. It
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* populates the fields common to all records (id, size and data).
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* Subclasses should be sure to validate the id,
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* Company:
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* @author Andrew C. Oliver
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* @author Marc Johnson (mjohnson at apache dot org)
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* @author Jason Height (jheight at chariot dot net dot au)
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* @version 2.0-pre
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*/
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public abstract class Record
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{
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/**
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* instantiates a blank record strictly for ID matching
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*/
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public Record()
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{
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}
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/**
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* Constructor Record
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*
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* @param id record id
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* @param size record size
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* @param data raw data
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*/
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public Record(short id, short size, byte [] data)
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{
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validateSid(id);
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fillFields(data, size);
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}
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/**
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* Constructor Record
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*
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* @param id record id
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* @param size record size
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* @param data raw data
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*/
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public Record(short id, short size, byte [] data, int offset)
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{
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validateSid(id);
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fillFields(data, size, offset);
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}
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/**
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* called by constructor, should throw runtime exception in the event of a
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* record passed with a differing ID.
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*
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* @param id alleged id for this record
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*/
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protected abstract void validateSid(short id);
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/**
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* called by the constructor, should set class level fields. Should throw
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* runtime exception for bad/icomplete data.
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*
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* @param data raw data
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*/
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protected void fillFields(byte [] data, short size)
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{
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fillFields(data, size, 0);
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}
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/**
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* called by the constructor, should set class level fields. Should throw
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* runtime exception for bad/icomplete data.
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*
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* @param data raw data
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* @param size size of data
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* @param offset of the record's data (provided a big array of the file)
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*/
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protected abstract void fillFields(byte [] data, short size, int offset);
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/**
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* called by the class that is responsible for writing this sucker.
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* Subclasses should implement this so that their data is passed back in a
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* byte array.
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*
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* @return byte array containing instance data
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*/
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public byte [] serialize()
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{
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byte[] retval = new byte[ getRecordSize() ];
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serialize(0, retval);
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return retval;
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}
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/**
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* called by the class that is responsible for writing this sucker.
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* Subclasses should implement this so that their data is passed back in a
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* byte array.
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*
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* @param offset to begin writing at
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* @param data byte array containing instance data
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* @return number of bytes written
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*/
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public abstract int serialize(int offset, byte [] data);
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/**
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* gives the current serialized size of the record. Should include the sid and reclength (4 bytes).
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*/
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public int getRecordSize()
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{
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// this is kind od a stupid way to do it but for now we just serialize
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// the record and return the size of the byte array
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return serialize().length;
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}
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/**
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* tells whether this type of record contains a value
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*/
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public boolean isValue()
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{
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return false;
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}
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/**
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* DBCELL, ROW, VALUES all say yes
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*/
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public boolean isInValueSection()
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{
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return false;
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}
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/**
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* get a string representation of the record (for biffview/debugging)
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*/
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public String toString()
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{
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return super.toString();
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}
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/**
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* Process a continuation record; default handling is to ignore
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* it -- TODO add logging
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*
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* @param record the continuation record's data
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*/
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// made public to satisfy biffviewer
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/* protected */
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public void processContinueRecord(byte [] record)
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{
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// System.out.println("Got a continue record ... NOW what??");
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}
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/**
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* return the non static version of the id for this record.
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*/
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public abstract short getSid();
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public Object clone() {
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throw new RuntimeException("The class "+getClass().getName()+" needs to define a clone method");
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}
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}
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