vitess.io/vitess@v0.16.2/go/vt/vtadmin/sort/clusters.go (about)

     1  /*
     2  Copyright 2020 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package sort
    18  
    19  import (
    20  	"sort"
    21  
    22  	"vitess.io/vitess/go/vt/vtadmin/cluster"
    23  )
    24  
    25  // ClustersBy provides an interface to sort Clusters by arbitrary comparison.
    26  type ClustersBy func(c1, c2 *cluster.Cluster) bool
    27  
    28  // Sort sorts a slice of Clusters by the given comparison function.
    29  func (by ClustersBy) Sort(clusters []*cluster.Cluster) {
    30  	sorter := &clusterSorter{
    31  		clusters: clusters,
    32  		by:       by,
    33  	}
    34  	sort.Sort(sorter)
    35  }
    36  
    37  type clusterSorter struct {
    38  	clusters []*cluster.Cluster
    39  	by       func(c1, c2 *cluster.Cluster) bool
    40  }
    41  
    42  func (s clusterSorter) Len() int           { return len(s.clusters) }
    43  func (s clusterSorter) Swap(i, j int)      { s.clusters[i], s.clusters[j] = s.clusters[j], s.clusters[i] }
    44  func (s clusterSorter) Less(i, j int) bool { return s.by(s.clusters[i], s.clusters[j]) }