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0ca8087ec9
Since go 1.18, interface{} can be replaced with any.
Signed-off-by: Robin Jarry <robin@jarry.cc>
Reviewed-by: Karel Balej <balejk@matfyz.cz>
36 lines
1.2 KiB
Go
36 lines
1.2 KiB
Go
package iterator
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// Factory is the interface that wraps the NewIterator method. The
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// NewIterator() creates either UID or thread iterators and ensures that both
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// types of iterators implement the same iteration direction.
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type Factory interface {
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NewIterator(a any) Iterator
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}
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// Iterator implements an interface for iterating over UID or thread data. If
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// Next() returns true, the current value of the iterator can be read with
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// Value(). The return value of Value() is of type `any` and needs to be cast to
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// the correct type.
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//
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// The iterators are implemented such that the first returned value always
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// represents the top message in the message list. Hence, StartIndex() would
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// return the index of the top message whereas EndIndex() returns the index of
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// message at the bottom of the list.
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type Iterator interface {
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Next() bool
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Value() any
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StartIndex() int
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EndIndex() int
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}
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// NewFactory creates an iterator factory. When reverse is true, the iterators
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// are reversed in the sense that the lowest UID messages are displayed at the
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// top of the message list. Otherwise, the default order is with the highest
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// UID message on top.
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func NewFactory(reverse bool) Factory {
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if reverse {
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return &reverseFactory{}
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}
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return &defaultFactory{}
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}
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