org.apache.poi.hssf.eventusermodel.EventWorkbookBuilder Maven / Gradle / Ivy
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package org.apache.poi.hssf.eventusermodel;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.hssf.model.HSSFFormulaParser;
import org.apache.poi.hssf.model.InternalWorkbook;
import org.apache.poi.hssf.record.BoundSheetRecord;
import org.apache.poi.hssf.record.EOFRecord;
import org.apache.poi.hssf.record.ExternSheetRecord;
import org.apache.poi.hssf.record.Record;
import org.apache.poi.hssf.record.SSTRecord;
import org.apache.poi.hssf.record.SupBookRecord;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
/**
* When working with the EventUserModel, if you want to
* process formulas, you need an instance of
* {@link InternalWorkbook} to pass to a {@link HSSFWorkbook},
* to finally give to {@link HSSFFormulaParser},
* and this will build you stub ones.
* Since you're working with the EventUserModel, you
* wouldn't want to get a full {@link InternalWorkbook} and
* {@link HSSFWorkbook}, as they would eat too much memory.
* Instead, you should collect a few key records as they
* go past, then call this once you have them to build a
* stub {@link InternalWorkbook}, and from that a stub
* {@link HSSFWorkbook}, to use with the {@link HSSFFormulaParser}.
*
* The records you should collect are:
* * {@link ExternSheetRecord}
* * {@link BoundSheetRecord}
* You should probably also collect {@link SSTRecord},
* but it's not required to pass this in.
*
* To help, this class includes a HSSFListener wrapper
* that will do the collecting for you.
*/
public class EventWorkbookBuilder {
/**
* Creates a stub Workbook from the supplied records,
* suitable for use with the {@link HSSFFormulaParser}
* @param externs The ExternSheetRecords in your file
* @param bounds The BoundSheetRecords in your file
* @param sst The SSTRecord in your file.
* @return A stub Workbook suitable for use with {@link HSSFFormulaParser}
*/
public static InternalWorkbook createStubWorkbook(ExternSheetRecord[] externs,
BoundSheetRecord[] bounds, SSTRecord sst) {
List wbRecords = new ArrayList();
// Core Workbook records go first
if(bounds != null) {
for(int i=0; i boundSheetRecords = new ArrayList();
private List externSheetRecords = new ArrayList();
private SSTRecord sstRecord = null;
public SheetRecordCollectingListener(HSSFListener childListener) {
this.childListener = childListener;
}
public BoundSheetRecord[] getBoundSheetRecords() {
return boundSheetRecords.toArray(
new BoundSheetRecord[boundSheetRecords.size()]
);
}
public ExternSheetRecord[] getExternSheetRecords() {
return externSheetRecords.toArray(
new ExternSheetRecord[externSheetRecords.size()]
);
}
public SSTRecord getSSTRecord() {
return sstRecord;
}
public HSSFWorkbook getStubHSSFWorkbook() {
// Create a base workbook
HSSFWorkbook wb = HSSFWorkbook.create(getStubWorkbook());
// Stub the sheets, so sheet name lookups work
for (BoundSheetRecord bsr : boundSheetRecords) {
wb.createSheet(bsr.getSheetname());
}
// Ready for Formula use!
return wb;
}
public InternalWorkbook getStubWorkbook() {
return createStubWorkbook(
getExternSheetRecords(), getBoundSheetRecords(),
getSSTRecord()
);
}
/**
* Process this record ourselves, and then
* pass it on to our child listener
*/
public void processRecord(Record record) {
// Handle it ourselves
processRecordInternally(record);
// Now pass on to our child
childListener.processRecord(record);
}
/**
* Process the record ourselves, but do not
* pass it on to the child Listener.
*/
public void processRecordInternally(Record record) {
if(record instanceof BoundSheetRecord) {
boundSheetRecords.add((BoundSheetRecord)record);
}
else if(record instanceof ExternSheetRecord) {
externSheetRecords.add((ExternSheetRecord)record);
}
else if(record instanceof SSTRecord) {
sstRecord = (SSTRecord)record;
}
}
}
}