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Option to skip creation of aggregated output if input set is empty #20

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atanasenko
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Will also address part of issue #15

Signed-off-by: Anton Tanasenko <atg.sleepless@gmail.com>
@atanasenko
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Or maybe it's better to add a InputSet#hasInputs() method and control this from application code?

@@ -133,4 +133,18 @@ public void testEmpty() throws Exception {
Assert.assertEquals(1, indexer.outputs.size());
}

@Test
public void testEmptyNoCreate() throws Exception {
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Please add a test for incremental delete of an aggregate output created during a prior build.

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I am not sure, to be honest. On one hand, the less code the client has to write, the better, so if we can encapsulate correct behaviour in the library, we should do that. On the other hand, I can imagine some clients may want/need to create aggregate outputs for empty input sets... but I can't think of practical usecase... sigh. api design is hard.

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