1//Copyright 2013 GoGraphviz Authors
2//
3//Licensed under the Apache License, Version 2.0 (the "License");
4//you may not use this file except in compliance with the License.
5//You may obtain a copy of the License at
6//
7//    http://www.apache.org/licenses/LICENSE-2.0
8//
9//Unless required by applicable law or agreed to in writing, software
10//distributed under the License is distributed on an "AS IS" BASIS,
11//WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12//See the License for the specific language governing permissions and
13//limitations under the License.
14
15package gographviz
16
17import (
18	"sort"
19)
20
21//Represents a Subgraph.
22type SubGraph struct {
23	Attrs Attrs
24	Name  string
25}
26
27//Creates a new Subgraph.
28func NewSubGraph(name string) *SubGraph {
29	return &SubGraph{
30		Attrs: make(Attrs),
31		Name:  name,
32	}
33}
34
35//Represents a set of SubGraphs.
36type SubGraphs struct {
37	SubGraphs map[string]*SubGraph
38}
39
40//Creates a new blank set of SubGraphs.
41func NewSubGraphs() *SubGraphs {
42	return &SubGraphs{make(map[string]*SubGraph)}
43}
44
45//Adds and creates a new Subgraph to the set of SubGraphs.
46func (this *SubGraphs) Add(name string) {
47	if _, ok := this.SubGraphs[name]; !ok {
48		this.SubGraphs[name] = NewSubGraph(name)
49	}
50}
51
52func (this *SubGraphs) Sorted() []*SubGraph {
53	keys := make([]string, 0)
54	for key := range this.SubGraphs {
55		keys = append(keys, key)
56	}
57	sort.Strings(keys)
58	s := make([]*SubGraph, len(keys))
59	for i, key := range keys {
60		s[i] = this.SubGraphs[key]
61	}
62	return s
63}
64