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30 lines
913 B
30 lines
913 B
8 years ago
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// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package kv
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import "github.com/juju/errors"
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// NextUntil applies FnKeyCmp to each entry of the iterator until meets some condition.
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// It will stop when fn returns true, or iterator is invalid or an error occurs.
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func NextUntil(it Iterator, fn FnKeyCmp) error {
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var err error
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for it.Valid() && !fn(it.Key()) {
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err = it.Next()
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if err != nil {
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return errors.Trace(err)
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}
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}
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return nil
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}
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