/**
* Apply an appropriate column filter based on the input string. Four modes of operation:
*
* <ol>
* <li>1. Null or blank ("") `colFilter`: do nothing.
* <li>2. No ranges `colFilter`: use scanner.fetchColumn() which invokes an Accumulo system
* {@link ColumnQualifierFilter}.
* <li>3. Singleton range `colFilter`: use Accumulo user {@link ColumnSliceFilter}.
* <li>4. Multi-range `colFilter`: use Graphulo {@link D4mRangeFilter}.
* </ol>
*
* @param colFilter column filter string
* @param scanner to call fetchColumn() on, for case #2
* @param dis to call append()/prepend() on, for cases #3 and #4
* @param append True means call {@link DynamicIteratorSetting#append}. False means call {@link
* DynamicIteratorSetting#prepend}
*/
public static void applyGeneralColumnFilter(
String colFilter, ScannerBase scanner, DynamicIteratorSetting dis, boolean append) {
// System.err.println("colFilter: "+colFilter);
if (colFilter != null && !colFilter.isEmpty()) {
int pos1 = colFilter.indexOf(':');
if (pos1 == -1) { // no ranges - collection of singleton texts
// todo - the order this filter applies is different. Ensure no logical bugs when we have
// case 2.
for (Text text : GraphuloUtil.d4mRowToTexts(colFilter)) {
scanner.fetchColumn(GraphuloUtil.EMPTY_TEXT, text);
}
} else {
SortedSet<Range> ranges = GraphuloUtil.d4mRowToRanges(colFilter);
assert ranges.size() > 0;
IteratorSetting s;
if (ranges.size() == 1) { // single range - use ColumnSliceFilter
Range r = ranges.first();
s = new IteratorSetting(1, ColumnSliceFilter.class);
// System.err.println("start: "+(r.isInfiniteStartKey() ? null :
// r.getStartKey().getRow().toString())
// +"end: "+(r.isInfiniteStopKey() ? null :
// r.getEndKey().getRow().toString()));
ColumnSliceFilter.setSlice(
s,
r.isInfiniteStartKey() ? null : r.getStartKey().getRow().toString(),
true,
r.isInfiniteStopKey() ? null : r.getEndKey().getRow().toString(),
true);
// System.err.println("!ok "+GraphuloUtil.d4mRowToRanges(colFilter));
} else { // multiple ranges
// System.err.println("ok "+GraphuloUtil.d4mRowToRanges(colFilter));
s = D4mRangeFilter.iteratorSetting(1, D4mRangeFilter.KeyPart.COLQ, colFilter);
}
if (append) dis.append(s);
else dis.prepend(s);
}
}
}
// @Deprecated
// * @deprecated Use {@link #applyGeneralColumnFilter(String, ScannerBase,
// DynamicIteratorSetting)} for more robust filter setting.
public static void applyGeneralColumnFilter(String colFilter, ScannerBase scanner, int priority) {
// System.err.println("colFilter: "+colFilter);
if (colFilter != null && !colFilter.isEmpty()) {
int pos1 = colFilter.indexOf(':');
if (pos1 == -1) { // no ranges - collection of singleton texts
for (Text text : GraphuloUtil.d4mRowToTexts(colFilter)) {
scanner.fetchColumn(GraphuloUtil.EMPTY_TEXT, text);
}
} else {
SortedSet<Range> ranges = GraphuloUtil.d4mRowToRanges(colFilter);
assert ranges.size() > 0;
IteratorSetting s;
if (ranges.size() == 1) { // single range - use ColumnSliceFilter
Range r = ranges.first();
if (r.isInfiniteStartKey() && r.isInfiniteStopKey())
return; // Infinite case: no filtering.
s = new IteratorSetting(priority, ColumnSliceFilter.class);
// System.err.println("start: "+(r.isInfiniteStartKey() ? null :
// r.getStartKey().getRow().toString())
// +"end: "+(r.isInfiniteStopKey() ? null :
// r.getEndKey().getRow().toString()));
ColumnSliceFilter.setSlice(
s,
r.isInfiniteStartKey() ? null : r.getStartKey().getRow().toString(),
true,
r.isInfiniteStopKey() ? null : r.getEndKey().getRow().toString(),
true);
// System.err.println("!ok "+GraphuloUtil.d4mRowToRanges(colFilter));
} else { // multiple ranges
// System.err.println("ok "+GraphuloUtil.d4mRowToRanges(colFilter));
s = D4mRangeFilter.iteratorSetting(1, D4mRangeFilter.KeyPart.COLQ, colFilter);
}
scanner.addScanIterator(s);
}
}
}
