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Start to pull out some of the OLE2 logic, so we can then split some Scratchpad parts out

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git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1752223 13f79535-47bb-0310-9956-ffa450edef68
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Nick Burch 2016-07-11 22:20:51 +00:00
parent f94e7e761b
commit ed7940dee5
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src/java/org/apache/poi/extractor/OLE2ExtractorFactory.java Normal file
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/* ====================================================================
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.extractor;
import static org.apache.poi.hssf.model.InternalWorkbook.WORKBOOK_DIR_ENTRY_NAMES;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import org.apache.poi.POIOLE2TextExtractor;
import org.apache.poi.POITextExtractor;
import org.apache.poi.hssf.extractor.EventBasedExcelExtractor;
import org.apache.poi.hssf.extractor.ExcelExtractor;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.poifs.filesystem.DirectoryEntry;
import org.apache.poi.poifs.filesystem.DirectoryNode;
import org.apache.poi.poifs.filesystem.Entry;
import org.apache.poi.poifs.filesystem.NPOIFSFileSystem;
import org.apache.poi.poifs.filesystem.OPOIFSFileSystem;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.xmlbeans.XmlException;
/**
* Figures out the correct POIOLE2TextExtractor for your supplied
* document, and returns it.
*
* <p>Note 1 - will fail for many file formats if the POI Scratchpad jar is
* not present on the runtime classpath</p>
* <p>Note 2 - for text extractor creation across all formats, use
* {@link org.apache.poi.extractor.ExtractorFactory} contained within
* the OOXML jar.</p>
* <p>Note 3 - rather than using this, for most cases you would be better
* off switching to <a href="http://tika.apache.org">Apache Tika</a> instead!</p>
*/
@SuppressWarnings("WeakerAccess")
public class OLE2ExtractorFactory {
/** Should this thread prefer event based over usermodel based extractors? */
private static final ThreadLocal<Boolean> threadPreferEventExtractors = new ThreadLocal<Boolean>() {
@Override
protected Boolean initialValue() { return Boolean.FALSE; }
};
/** Should all threads prefer event based over usermodel based extractors? */
private static Boolean allPreferEventExtractors;
/**
* Should this thread prefer event based over usermodel based extractors?
* (usermodel extractors tend to be more accurate, but use more memory)
* Default is false.
*/
public static boolean getThreadPrefersEventExtractors() {
return threadPreferEventExtractors.get();
}
/**
* Should all threads prefer event based over usermodel based extractors?
* (usermodel extractors tend to be more accurate, but use more memory)
* Default is to use the thread level setting, which defaults to false.
*/
public static Boolean getAllThreadsPreferEventExtractors() {
return allPreferEventExtractors;
}
/**
* Should this thread prefer event based over usermodel based extractors?
* Will only be used if the All Threads setting is null.
*/
public static void setThreadPrefersEventExtractors(boolean preferEventExtractors) {
threadPreferEventExtractors.set(preferEventExtractors);
}
/**
* Should all threads prefer event based over usermodel based extractors?
* If set, will take preference over the Thread level setting.
*/
public static void setAllThreadsPreferEventExtractors(Boolean preferEventExtractors) {
allPreferEventExtractors = preferEventExtractors;
}
/**
* Should this thread use event based extractors is available?
* Checks the all-threads one first, then thread specific.
*/
protected static boolean getPreferEventExtractor() {
if(allPreferEventExtractors != null) {
return allPreferEventExtractors;
}
return threadPreferEventExtractors.get();
}
public static POIOLE2TextExtractor createExtractor(POIFSFileSystem fs) throws IOException, OpenXML4JException, XmlException {
// Only ever an OLE2 one from the root of the FS
return (POIOLE2TextExtractor)createExtractor(fs.getRoot());
}
public static POIOLE2TextExtractor createExtractor(NPOIFSFileSystem fs) throws IOException, OpenXML4JException, XmlException {
// Only ever an OLE2 one from the root of the FS
return (POIOLE2TextExtractor)createExtractor(fs.getRoot());
}
public static POIOLE2TextExtractor createExtractor(OPOIFSFileSystem fs) throws IOException, OpenXML4JException, XmlException {
// Only ever an OLE2 one from the root of the FS
return (POIOLE2TextExtractor)createExtractor(fs.getRoot());
}
public static POITextExtractor createExtractor(InputStream input) {
// TODO Something nasty with reflection...
return null;
}
/**
* Create the Extractor, if possible. Generally needs the Scratchpad jar.
* Note that this won't check for embedded OOXML resources either, use
* {@link org.apache.poi.extractor.ExtractorFactory} for that.
*/
public static POITextExtractor createExtractor(DirectoryNode poifsDir)
throws IOException, OpenXML4JException, XmlException
{
// Look for certain entries in the stream, to figure it
// out from
for (String workbookName : WORKBOOK_DIR_ENTRY_NAMES) {
if (poifsDir.hasEntry(workbookName)) {
if (getPreferEventExtractor()) {
return new EventBasedExcelExtractor(poifsDir);
}
return new ExcelExtractor(poifsDir);
}
}
// TODO Try to ask the Scratchpad
throw new IllegalArgumentException("No supported documents found in the OLE2 stream");
}
/**
* Returns an array of text extractors, one for each of
* the embedded documents in the file (if there are any).
* If there are no embedded documents, you'll get back an
* empty array. Otherwise, you'll get one open
* {@link POITextExtractor} for each embedded file.
*/
public static POITextExtractor[] getEmbededDocsTextExtractors(POIOLE2TextExtractor ext)
throws IOException, OpenXML4JException, XmlException
{
// All the embedded directories we spotted
ArrayList<Entry> dirs = new ArrayList<Entry>();
// For anything else not directly held in as a POIFS directory
ArrayList<InputStream> nonPOIFS = new ArrayList<InputStream>();
// Find all the embedded directories
DirectoryEntry root = ext.getRoot();
if(root == null) {
throw new IllegalStateException("The extractor didn't know which POIFS it came from!");
}
if(ext instanceof ExcelExtractor) {
// These are in MBD... under the root
Iterator<Entry> it = root.getEntries();
while(it.hasNext()) {
Entry entry = it.next();
if(entry.getName().startsWith("MBD")) {
dirs.add(entry);
}
}
} else {
// TODO Ask scratchpad
}
// Create the extractors
if(dirs.size() == 0 && nonPOIFS.size() == 0){
return new POITextExtractor[0];
}
ArrayList<POITextExtractor> e = new ArrayList<POITextExtractor>();
for (Entry dir : dirs) {
e.add(createExtractor(
(DirectoryNode) dir
));
}
for (InputStream nonPOIF : nonPOIFS) {
try {
e.add(createExtractor(nonPOIF));
} catch (IllegalArgumentException ie) {
// Ignore, just means it didn't contain
// a format we support as yet
// TODO Should we log this?
} catch (Exception xe) {
// Ignore, invalid format
// TODO Should we log this?
}
}
return e.toArray(new POITextExtractor[e.size()]);
}
}