org.apache.poi.hssf.record.RecordFactory Maven / Gradle / Ivy
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this work for additional information regarding copyright ownership.
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(the "License"); you may not use this file except in compliance with
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http://www.apache.org/licenses/LICENSE-2.0
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See the License for the specific language governing permissions and
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==================================================================== */
package org.apache.poi.hssf.record;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.poi.util.IOUtils;
import org.apache.poi.util.RecordFormatException;
/**
* Title: Record Factory
* Description: Takes a stream and outputs an array of Record objects.
*
* @see org.apache.poi.hssf.eventmodel.EventRecordFactory
*/
public final class RecordFactory {
private static final int NUM_RECORDS = 512;
// how many records we read at max by default (can be adjusted via IOUtils)
//increased to 5 million due to https://bz.apache.org/bugzilla/show_bug.cgi?id=65887
private static final int DEFAULT_MAX_NUMBER_OF_RECORDS = 5_000_000;
private static int MAX_NUMBER_OF_RECORDS = DEFAULT_MAX_NUMBER_OF_RECORDS;
public static void setMaxNumberOfRecords(int maxNumberOfRecords) {
MAX_NUMBER_OF_RECORDS = maxNumberOfRecords;
}
public static int getMaxNumberOfRecords() {
return MAX_NUMBER_OF_RECORDS;
}
private RecordFactory() {}
/**
* Debug / diagnosis method
*
* Gets the POI implementation class for a given {@code sid}. Only a subset of the BIFF
* records are actually interpreted by POI. A few others are known but not interpreted
* (see {@link UnknownRecord#getBiffName(int)}).
*
* @param sid the record sid
*
* @return the POI implementation class for the specified record {@code sid}.
* {@code null} if the specified record is not interpreted by POI.
*/
public static Class getRecordClass(int sid) {
return HSSFRecordTypes.forSID(sid).clazz;
}
/**
* create a record, if there are MUL records than multiple records
* are returned digested into the non-mul form.
*
* @param in the RecordInputStream to read from
* @return the extracted records
*/
public static org.apache.poi.hssf.record.Record [] createRecord(RecordInputStream in) {
Record record = createSingleRecord(in);
if (record instanceof DBCellRecord) {
// Not needed by POI. Regenerated from scratch by POI when spreadsheet is written
return new Record[] { null, };
}
if (record instanceof RKRecord) {
return new Record[] { convertToNumberRecord((RKRecord) record), };
}
if (record instanceof MulRKRecord) {
return convertRKRecords((MulRKRecord)record);
}
return new Record[] { record, };
}
public static org.apache.poi.hssf.record.Record createSingleRecord(RecordInputStream in) {
HSSFRecordTypes rec = HSSFRecordTypes.forSID(in.getSid());
if (!rec.isParseable()) {
rec = HSSFRecordTypes.UNKNOWN;
}
return rec.recordConstructor.apply(in);
}
/**
* RK record is a slightly smaller alternative to NumberRecord
* POI likes NumberRecord better
*
* @param rk the RK record to convert
* @return the NumberRecord
*/
public static NumberRecord convertToNumberRecord(RKRecord rk) {
NumberRecord num = new NumberRecord();
num.setColumn(rk.getColumn());
num.setRow(rk.getRow());
num.setXFIndex(rk.getXFIndex());
num.setValue(rk.getRKNumber());
return num;
}
/**
* Converts a {@link MulRKRecord} into an equivalent array of {@link NumberRecord NumberRecords}
*
* @param mrk the MulRKRecord to convert
* @return the equivalent array of {@link NumberRecord NumberRecords}
*/
public static NumberRecord[] convertRKRecords(MulRKRecord mrk) {
int numColumns = mrk.getNumColumns();
if (numColumns < 0) {
throw new RecordFormatException("Cannot create RKRecords with negative number of columns: " + numColumns);
}
NumberRecord[] mulRecs = new NumberRecord[numColumns];
for (int k = 0; k < numColumns; k++) {
NumberRecord nr = new NumberRecord();
nr.setColumn((short) (k + mrk.getFirstColumn()));
nr.setRow(mrk.getRow());
nr.setXFIndex(mrk.getXFAt(k));
nr.setValue(mrk.getRKNumberAt(k));
mulRecs[k] = nr;
}
return mulRecs;
}
/**
* Converts a {@link MulBlankRecord} into an equivalent array of {@link BlankRecord BlankRecords}
*
* @param mbk the MulBlankRecord to convert
* @return the equivalent array of {@link BlankRecord BlankRecords}
*/
public static BlankRecord[] convertBlankRecords(MulBlankRecord mbk) {
BlankRecord[] mulRecs = new BlankRecord[mbk.getNumColumns()];
for (int k = 0; k < mbk.getNumColumns(); k++) {
BlankRecord br = new BlankRecord();
br.setColumn((short) (k + mbk.getFirstColumn()));
br.setRow(mbk.getRow());
br.setXFIndex(mbk.getXFAt(k));
mulRecs[k] = br;
}
return mulRecs;
}
/**
* @return an array of all the SIDS for all known records
*/
public static short[] getAllKnownRecordSIDs() {
int[] intSid = Arrays.stream(HSSFRecordTypes.values()).mapToInt(HSSFRecordTypes::getSid).toArray();
short[] shortSid = new short[intSid.length];
for (int i=0; i createRecords(InputStream in) throws RecordFormatException {
List records = new ArrayList<>(NUM_RECORDS);
RecordFactoryInputStream recStream = new RecordFactoryInputStream(in, true);
Record record;
while ((record = recStream.nextRecord())!=null) {
records.add(record);
IOUtils.safelyAllocateCheck(records.size(), MAX_NUMBER_OF_RECORDS);
}
return records;
}
}