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bug 57840: move XSSFTable cache from XSSFWorkbook to XSSFEvaluationWorkbook where staleness is less likely to cause problems for users 

git-svn-id: https://svn.apache.org/repos/asf/poi/branches/xssf_structured_references@1747616 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Javen O'Neal 2016-06-10 01:08:05 +00:00
parent 5b983791aa
commit 1817337056
1 changed files with 10 additions and 35 deletions
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45
src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFWorkbook.java
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@ -2263,48 +2263,23 @@ public class XSSFWorkbook extends POIXMLDocument implements Workbook {
return SpreadsheetVersion.EXCEL2007;
}
/*
* TODO: data tables are stored at the workbook level in XSSF, but are bound to a single sheet.
* The current code structure has them hanging off XSSFSheet, but formulas reference them
* only by name (names are global, and case insensitive).
* This map stores names as lower case for case-insensitive lookups.
*
* FIXME: Caching tables by name here for fast formula lookup means the map is out of date if
* a table is renamed or added/removed to a sheet after the map is created.
*
* Perhaps tables can be managed similar to PivotTable references above?
*/
Map<String, XSSFTable> _tableCache = null;
private Map<String, XSSFTable> getTableCache() {
if ( _tableCache != null ) {
return _tableCache;
}
// FIXME: use org.apache.commons.collections.map.CaseInsensitiveMap
_tableCache = new HashMap<String, XSSFTable>();
if (sheets != null) {
for (XSSFSheet sheet : sheets) {
for (XSSFTable tbl : sheet.getTables()) {
String lname = tbl.getName().toLowerCase(Locale.ROOT);
_tableCache.put(lname, tbl);
}
}
}
return _tableCache;
}
/**
* Returns the data table with the given name (case insensitive).
* Tables are cached for performance (formula evaluation looks them up by name repeatedly).
* After the first table lookup, adding or removing a table from the document structure will cause trouble.
* This is meant to be used on documents whose structure is essentially static at the point formulas are evaluated.
*
* @param name the data table name (case-insensitive)
* @return The Data table in the workbook named <tt>name</tt>, or <tt>null</tt> if no table is named <tt>name</tt>.
* @since 3.15 beta 2
*/
public XSSFTable getTable(String name) {
String lname = name.toLowerCase(Locale.ROOT);
return getTableCache().get(lname);
if (sheets != null) {
for (XSSFSheet sheet : sheets) {
for (XSSFTable tbl : sheet.getTables()) {
if (name.equalsIgnoreCase(tbl.getName())) {
return tbl;
}
}
}
}
return null;
}
}