Column sorting using async dataprovider in celltable

Hello,

We are using an async dataprovider in our celltable, and we have had
some problemt gettting the sorting to work.

In the OnRangeChanged method, we implement sorting this way:

if (sortList.get(0).getColumn().equals(costManagementNameColumn)) {
Collections.sort(effectConfigurationCache, new
Comparator<EffectConfiguration>() {
public int compare(EffectConfiguration o1, EffectConfiguration o2) {
if (o1 == o2) {
return 0;
}
// Compare the cost management name columns.
int diff = -1;
if (o1 != null) {
diff = (o2 != null) ?
o1.getCostManagementName().compareTo(o2.getCostManagementName()) : 1;
}
return sortList.get(0).isAscending() ? diff : -diff;
}
});
} else if (sortList.get(0).getColumn().equals(orgUnitNameColumn)) {
Collections.sort(effectConfigurationCache, new
Comparator<EffectConfiguration>() {
public int compare(EffectConfiguration o1, EffectConfiguration o2) {
.....
.....
}
});
} else if (sortList.get(0).getColumn().equals(effectTypeNameColumn)) {
Collections.sort(effectConfigurationCache, new
Comparator<EffectConfiguration>() {
public int compare(EffectConfiguration o1, EffectConfiguration o2) {
......
.....
}
});
} else if (sortList.get(0).getColumn().equals(maximumThresholdColumn))
{
Collections.sort(effectConfigurationCache, new
Comparator<EffectConfiguration>() {
public int compare(EffectConfiguration o1, EffectConfiguration o2) {
......
.....
}
});
}

This seems to be quite cumbersome !
Can this be done more elegantly?

Previously we used the ListDataProvider, and here sorting is
implemented directly on the ListHandler by setting a comparator for
each column, wich we think is a elegant way to do it!

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