Start on a eventusermodel based excel text extractor

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@647574 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Nick Burch 2008-04-13 14:58:27 +00:00
parent 205b021a27
commit 497c9eb3c6
3 changed files with 523 additions and 99 deletions

316
KEYS
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@ -48,7 +48,7 @@ uid Nick Burch <nick@apache.org>
sub 1024g/5E0E1748 2004-03-24 [expires: 2009-03-23] sub 1024g/5E0E1748 2004-03-24 [expires: 2009-03-23]
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@ -0,0 +1,260 @@
/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */
package org.apache.poi.hssf.extractor;
import java.io.IOException;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.apache.poi.POIOLE2TextExtractor;
import org.apache.poi.hpsf.DocumentSummaryInformation;
import org.apache.poi.hpsf.SummaryInformation;
import org.apache.poi.hssf.eventusermodel.FormatTrackingHSSFListener;
import org.apache.poi.hssf.eventusermodel.HSSFEventFactory;
import org.apache.poi.hssf.eventusermodel.HSSFListener;
import org.apache.poi.hssf.eventusermodel.HSSFRequest;
import org.apache.poi.hssf.model.FormulaParser;
import org.apache.poi.hssf.record.BOFRecord;
import org.apache.poi.hssf.record.BoundSheetRecord;
import org.apache.poi.hssf.record.CellValueRecordInterface;
import org.apache.poi.hssf.record.FormulaRecord;
import org.apache.poi.hssf.record.LabelRecord;
import org.apache.poi.hssf.record.LabelSSTRecord;
import org.apache.poi.hssf.record.NoteRecord;
import org.apache.poi.hssf.record.NumberRecord;
import org.apache.poi.hssf.record.Record;
import org.apache.poi.hssf.record.SSTRecord;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
/**
* A text extractor for Excel files, that is based
* on the hssf eventusermodel api.
* It will typically use less memory than
* {@link ExcelExtractor}, but may not provide
* the same richness of formatting.
* Returns the textual content of the file, suitable for
* indexing by something like Lucene, but not really
* intended for display to the user.
* To turn an excel file into a CSV or similar, then see
* the XLS2CSVmra example
* @see org.apache.poi.hssf.eventusermodel.examples.XLS2CSVmra
*/
public class EventBasedExcelExtractor extends POIOLE2TextExtractor {
private POIFSFileSystem fs;
private boolean includeSheetNames = true;
private boolean formulasNotResults = false;
public EventBasedExcelExtractor(POIFSFileSystem fs) throws IOException {
super(null);
this.fs = fs;
}
/**
* Would return the document information metadata for the document,
* if we supported it
*/
public DocumentSummaryInformation getDocSummaryInformation() {
throw new IllegalStateException("Metadata extraction not supported in streaming mode, please use ExcelExtractor");
}
/**
* Would return the summary information metadata for the document,
* if we supported it
*/
public SummaryInformation getSummaryInformation() {
throw new IllegalStateException("Metadata extraction not supported in streaming mode, please use ExcelExtractor");
}
/**
* Should sheet names be included? Default is true
*/
public void setIncludeSheetNames(boolean includeSheetNames) {
this.includeSheetNames = includeSheetNames;
}
/**
* Should we return the formula itself, and not
* the result it produces? Default is false
*/
public void setFormulasNotResults(boolean formulasNotResults) {
this.formulasNotResults = formulasNotResults;
}
/**
* Retreives the text contents of the file
*/
public String getText() {
String text = null;
try {
TextListener tl = triggerExtraction();
text = tl.text.toString();
if(! text.endsWith("\n")) {
text = text + "\n";
}
} catch(IOException e) {
throw new RuntimeException(e);
}
return text;
}
private TextListener triggerExtraction() throws IOException {
TextListener tl = new TextListener();
FormatTrackingHSSFListener ft = new FormatTrackingHSSFListener(tl);
tl.ft = ft;
// Register and process
HSSFEventFactory factory = new HSSFEventFactory();
HSSFRequest request = new HSSFRequest();
request.addListenerForAllRecords(ft);
factory.processWorkbookEvents(request, fs);
return tl;
}
private class TextListener implements HSSFListener {
private FormatTrackingHSSFListener ft;
private SSTRecord sstRecord;
private List sheetNames = new ArrayList();
private StringBuffer text = new StringBuffer();
private int sheetNum = -1;
private int rowNum;
public void processRecord(Record record) {
String thisText = null;
int thisRow = -1;
switch(record.getSid()) {
case BoundSheetRecord.sid:
BoundSheetRecord sr = (BoundSheetRecord)record;
sheetNames.add(sr.getSheetname());
break;
case BOFRecord.sid:
BOFRecord bof = (BOFRecord)record;
if(bof.getType() == BOFRecord.TYPE_WORKSHEET) {
sheetNum++;
rowNum = -1;
if(includeSheetNames) {
if(text.length() > 0) text.append("\n");
text.append(sheetNames.get(sheetNum));
}
}
break;
case SSTRecord.sid:
sstRecord = (SSTRecord)record;
break;
case FormulaRecord.sid:
FormulaRecord frec = (FormulaRecord) record;
thisRow = frec.getRow();
if(formulasNotResults) {
thisText = FormulaParser.toFormulaString(null, frec.getParsedExpression());
} else {
if(Double.isNaN( frec.getValue() )) {
thisText = "(todo - string formulas)";
} else {
thisText = formatNumberDateCell(frec, frec.getValue());
}
}
break;
case LabelRecord.sid:
LabelRecord lrec = (LabelRecord) record;
thisRow = lrec.getRow();
thisText = lrec.getValue();
break;
case LabelSSTRecord.sid:
LabelSSTRecord lsrec = (LabelSSTRecord) record;
thisRow = lsrec.getRow();
if(sstRecord == null) {
throw new IllegalStateException("No SST record found");
}
thisText = sstRecord.getString(lsrec.getSSTIndex()).toString();
break;
case NoteRecord.sid:
NoteRecord nrec = (NoteRecord) record;
thisRow = nrec.getRow();
// TODO: Find object to match nrec.getShapeId()
break;
case NumberRecord.sid:
NumberRecord numrec = (NumberRecord) record;
thisRow = numrec.getRow();
thisText = formatNumberDateCell(numrec, numrec.getValue());
break;
default:
break;
}
if(thisText != null) {
if(thisRow != rowNum) {
rowNum = thisRow;
if(text.length() > 0)
text.append("\n");
} else {
text.append("\t");
}
text.append(thisText);
}
}
/**
* Formats a number or date cell, be that a real number, or the
* answer to a formula
*/
private String formatNumberDateCell(CellValueRecordInterface cell, double value) {
// Get the built in format, if there is one
int formatIndex = ft.getFormatIndex(cell);
String formatString = ft.getFormatString(cell);
if(formatString == null) {
return Double.toString(value);
} else {
// Is it a date?
if(HSSFDateUtil.isADateFormat(formatIndex,formatString) &&
HSSFDateUtil.isValidExcelDate(value)) {
// Java wants M not m for month
formatString = formatString.replace('m','M');
// Change \- into -, if it's there
formatString = formatString.replaceAll("\\\\-","-");
// Format as a date
Date d = HSSFDateUtil.getJavaDate(value, false);
DateFormat df = new SimpleDateFormat(formatString);
return df.format(d);
} else {
if(formatString == "General") {
// Some sort of wierd default
return Double.toString(value);
}
// Format as a number
DecimalFormat df = new DecimalFormat(formatString);
return df.format(value);
}
}
}
}
}

View File

@ -122,6 +122,52 @@ public final class TestExcelExtractor extends TestCase {
assertEquals("Sheet1\nUPPER(\"xyz\")\nSheet2\nSheet3\n", extractor.getText()); assertEquals("Sheet1\nUPPER(\"xyz\")\nSheet2\nSheet3\n", extractor.getText());
} }
public void testEventExtractor() throws Exception {
EventBasedExcelExtractor extractor;
// First up, a simple file with string
// based formulas in it
extractor = new EventBasedExcelExtractor(
new POIFSFileSystem(
HSSFTestDataSamples.openSampleFileStream("SimpleWithFormula.xls")
)
);
extractor.setIncludeSheetNames(true);
String text = extractor.getText();
// TODO
assertEquals("Sheet1\nreplaceme\nreplaceme\n(todo - string formulas)\nSheet2\nSheet3\n", text);
// assertEquals("Sheet1\nreplaceme\nreplaceme\nreplacemereplaceme\nSheet2\nSheet3\n", text);
extractor.setIncludeSheetNames(false);
extractor.setFormulasNotResults(true);
text = extractor.getText();
assertEquals("replaceme\nreplaceme\nCONCATENATE(A1,A2)\n", text);
// Now, a slightly longer file with numeric formulas
extractor = new EventBasedExcelExtractor(
new POIFSFileSystem(
HSSFTestDataSamples.openSampleFileStream("sumifformula.xls")
)
);
extractor.setIncludeSheetNames(false);
extractor.setFormulasNotResults(true);
text = extractor.getText();
assertEquals(
"1000.0\t1.0\tSUMIF(A1:A5,\">4000\",B1:B5)\n" +
"2000.0\t2.0\n" +
"3000.0\t3.0\n" +
"4000.0\t4.0\n" +
"5000.0\t5.0\n",
text
);
}
/** /**
* Embded in a non-excel file * Embded in a non-excel file
*/ */