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Reduce calls to utf-related methods - the integration test took ages because of poc-shared-strings.xlsx

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git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1744005 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Andreas Beeker 2016-05-16 10:02:13 +00:00
parent 20fe8a5e0f
commit fa00834766
1 changed files with 24 additions and 3 deletions
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27
src/examples/src/org/apache/poi/xssf/eventusermodel/examples/FromHowTo.java
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@ -18,6 +18,8 @@ package org.apache.poi.xssf.eventusermodel.examples;
import java.io.InputStream;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import org.apache.poi.openxml4j.opc.PackageAccess;
import org.apache.poi.xssf.eventusermodel.XLSX2CSV;
@ -92,11 +94,26 @@ public class FromHowTo {
* See org.xml.sax.helpers.DefaultHandler javadocs
*/
private static class SheetHandler extends DefaultHandler {
private SharedStringsTable sst;
private final SharedStringsTable sst;
private String lastContents;
private boolean nextIsString;
private boolean inlineStr;
private final LruCache<Integer,String> lruCache = new LruCache<Integer,String>(50);
private static class LruCache<A,B> extends LinkedHashMap<A, B> {
private final int maxEntries;
public LruCache(final int maxEntries) {
super(maxEntries + 1, 1.0f, true);
this.maxEntries = maxEntries;
}
@Override
protected boolean removeEldestEntry(final Map.Entry<A, B> eldest) {
return super.size() > maxEntries;
}
}
private SheetHandler(SharedStringsTable sst) {
this.sst = sst;
}
@ -121,8 +138,12 @@ public class FromHowTo {
// Process the last contents as required.
// Do now, as characters() may be called more than once
if(nextIsString) {
int idx = Integer.parseInt(lastContents);
lastContents = new XSSFRichTextString(sst.getEntryAt(idx)).toString();
Integer idx = Integer.valueOf(lastContents);
lastContents = lruCache.get(idx);
if (lastContents == null && !lruCache.containsKey(idx)) {
lastContents = new XSSFRichTextString(sst.getEntryAt(idx)).toString();
lruCache.put(idx, lastContents);
}
nextIsString = false;
}