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Make a start on some example code to use MissingRecordAwareHSSFListener for turning a xls into a csv 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@548030 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Nick Burch 2007-06-17 10:59:48 +00:00
parent fe87196450
commit bdc0883b6f
2 changed files with 220 additions and 1 deletions
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215
src/scratchpad/examples/src/org/apache/poi/hssf/eventusermodel/examples/XLS2CSVmra.java Normal file
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@ -0,0 +1,215 @@
/* ====================================================================
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.eventusermodel.examples;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintStream;
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.eventusermodel.MissingRecordAwareHSSFListener;
import org.apache.poi.hssf.eventusermodel.dummyrecord.LastCellOfRowDummyRecord;
import org.apache.poi.hssf.eventusermodel.dummyrecord.MissingCellDummyRecord;
import org.apache.poi.hssf.record.BlankRecord;
import org.apache.poi.hssf.record.BoolErrRecord;
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.RKRecord;
import org.apache.poi.hssf.record.Record;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
/**
* A XLS -> CSV processor, that uses the MissingRecordAware
* EventModel code to ensure it outputs all columns and rows.
* @author Nick Burch
*/
public class XLS2CSVmra implements HSSFListener {
private int minColumns;
private POIFSFileSystem fs;
private PrintStream output;
private int lastRowNumber;
private int lastColumnNumber;
/**
* Creates a new XLS -> CSV converter
* @param fs The POIFSFileSystem to process
* @param output The PrintStream to output the CSV to
* @param minColumns The minimum number of columns to output, or -1 for no minimum
*/
public XLS2CSVmra(POIFSFileSystem fs, PrintStream output, int minColumns) {
this.fs = fs;
this.output = output;
this.minColumns = minColumns;
}
/**
* Creates a new XLS -> CSV converter
* @param filename The file to process
* @param minColumns The minimum number of columns to output, or -1 for no minimum
* @throws IOException
* @throws FileNotFoundException
*/
public XLS2CSVmra(String filename, int minColumns) throws IOException, FileNotFoundException {
this(
new POIFSFileSystem(new FileInputStream(filename)),
System.out, minColumns
);
}
/**
* Initiates the processing of the XLS file to CSV
*/
public void process() throws IOException {
MissingRecordAwareHSSFListener listener = new MissingRecordAwareHSSFListener(this);
HSSFEventFactory factory = new HSSFEventFactory();
HSSFRequest request = new HSSFRequest();
request.addListenerForAllRecords(listener);
factory.processWorkbookEvents(request, fs);
}
/**
* Main HSSFListener method, processes events, and outputs the
* CSV as the file is processed.
*/
public void processRecord(Record record) {
int thisRow = -1;
int thisColumn = -1;
String thisStr = null;
switch (record.getSid())
{
case BlankRecord.sid:
BlankRecord brec = (BlankRecord) record;
thisRow = brec.getRow();
thisColumn = brec.getColumn();
thisStr = "";
break;
case BoolErrRecord.sid:
BoolErrRecord berec = (BoolErrRecord) record;
thisRow = berec.getRow();
thisColumn = berec.getColumn();
thisStr = "";
break;
case FormulaRecord.sid:
FormulaRecord frec = (FormulaRecord) record;
thisRow = frec.getRow();
thisColumn = frec.getColumn();
thisStr = '"' + frec.toString() + '"';
break;
case LabelRecord.sid:
LabelRecord lrec = (LabelRecord) record;
thisRow = lrec.getRow();
thisColumn = lrec.getColumn();
thisStr = '"' + lrec.getValue() + '"';
break;
case LabelSSTRecord.sid:
LabelSSTRecord lsrec = (LabelSSTRecord) record;
thisRow = lsrec.getRow();
thisColumn = lsrec.getColumn();
thisStr = '"' + "(TODO)" + '"';
break;
case NoteRecord.sid:
NoteRecord nrec = (NoteRecord) record;
thisRow = nrec.getRow();
thisColumn = nrec.getColumn();
thisStr = '"' + "(TODO)" + '"';
break;
case NumberRecord.sid:
NumberRecord numrec = (NumberRecord) record;
thisRow = numrec.getRow();
thisColumn = numrec.getColumn();
thisStr = Double.toString(numrec.getValue()); // TODO: Formatting
break;
case RKRecord.sid:
RKRecord rkrec = (RKRecord) record;
thisRow = rkrec.getRow();
thisColumn = rkrec.getColumn();
thisStr = '"' + "(TODO)" + '"';
break;
default:
break;
}
// Handle missing column
if(record instanceof MissingCellDummyRecord) {
MissingCellDummyRecord mc = (MissingCellDummyRecord)record;
thisRow = mc.getRow();
thisColumn = mc.getColumn();
thisStr = "";
}
// If we got something to print out, do so
if(thisStr != null) {
if(thisColumn > 0) {
output.print(',');
}
output.print(thisStr);
}
// Update column and row count
if(thisRow > -1)
lastRowNumber = thisRow;
if(thisColumn > -1)
lastColumnNumber = thisColumn;
// Handle end of row
if(record instanceof LastCellOfRowDummyRecord) {
// Print out any missing commas if needed
if(minColumns > 0) {
for(int i=lastColumnNumber; i<(minColumns-1); i++) {
output.print(',');
}
}
// End the row
output.println();
}
}
public static void main(String[] args) throws Exception {
if(args.length < 1) {
System.err.println("Use:");
System.err.println(" XLS2CSVmra <xls file> [min columns]");
System.exit(1);
}
int minColumns = -1;
if(args.length >= 2) {
minColumns = Integer.parseInt(args[1]);
}
XLS2CSVmra xls2csv = new XLS2CSVmra(args[0], minColumns);
xls2csv.process();
}
}

6
src/scratchpad/src/org/apache/poi/hssf/eventusermodel/MissingRecordAwareHSSFListener.java
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@ -110,14 +110,17 @@ public class MissingRecordAwareHSSFListener implements HSSFListener {
BlankRecord brec = (BlankRecord) record;
thisRow = brec.getRow();
thisColumn = brec.getColumn();
break;
case BoolErrRecord.sid:
BoolErrRecord berec = (BoolErrRecord) record;
thisRow = berec.getRow();
thisColumn = berec.getColumn();
break;
case FormulaRecord.sid:
FormulaRecord frec = (FormulaRecord) record;
thisRow = frec.getRow();
thisColumn = frec.getColumn();
break;
case LabelRecord.sid:
LabelRecord lrec = (LabelRecord) record;
thisRow = lrec.getRow();
@ -136,6 +139,7 @@ public class MissingRecordAwareHSSFListener implements HSSFListener {
NoteRecord nrec = (NoteRecord) record;
thisRow = nrec.getRow();
thisColumn = nrec.getColumn();
break;
case NumberRecord.sid:
NumberRecord numrec = (NumberRecord) record;
thisRow = numrec.getRow();
@ -147,11 +151,11 @@ public class MissingRecordAwareHSSFListener implements HSSFListener {
RKRecord rkrec = (RKRecord) record;
thisRow = rkrec.getRow();
thisColumn = rkrec.getColumn();
break;
default:
//System.out.println(record.getClass());
break;
}
System.out.println(record.getClass());
// Do we need to fire dummy end-of-row records?
if(thisRow != lastSeenRow) {