Function Example_indexRanges

index/example_range_test.go:28–78

()

}

func Example_indexRanges() {

	// Index ranges instead of keys:
	// In this example at most 4 keys shares one index item.

	data := RangeData("Aaron,1,Agatha,1,Al,2,Albert,3,Alexander,5,Alison,8")

	// keyOffsets is a prebuilt index that stores range start, range end and its offset.
	keyOffsets := []index.OffsetIndexItem{
		// Aaron  +--> 0
		// Agatha |
		// Al     |
		// Albert |

		// Alexander +--> 31
		// Alison    |

		{Key: "Aaron", Offset: 0},
		{Key: "Agatha", Offset: 0},
		{Key: "Al", Offset: 0},
		{Key: "Albert", Offset: 0},

		{Key: "Alexander", Offset: 31},
		{Key: "Alison", Offset: 31},
	}

	st, err := index.NewSlimIndex(keyOffsets, data)
	if err != nil {
		panic(err)
	}

	v, found := st.RangeGet("Aaron")
	fmt.Printf("key: %q\n  found: %t\n  value: %q\n", "Aaron", found, v)

	v, found = st.RangeGet("Al")
	fmt.Printf("key: %q\n  found: %t\n  value: %q\n", "Al", found, v)

	v, found = st.RangeGet("foo")
	fmt.Printf("key: %q\n  found: %t\n  value: %q\n", "foo", found, v)

	// Output:
	// key: "Aaron"
	//   found: true
	//   value: "1"
	// key: "Al"
	//   found: true
	//   value: "2"
	// key: "foo"
	//   found: false
	//   value: ""
}