07f542b4d7
Done with: ack '2018+' -l | xargs sed -i -e 's/2018+/2019+/g' Checked manually with: git add -p Hello to future James from 2020, and Happy Hacking!
126 lines
4.0 KiB
Go
126 lines
4.0 KiB
Go
// Mgmt
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// Copyright (C) 2013-2019+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package engine
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import (
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"fmt"
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)
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// EdgeableRes is the interface a resource must implement to support automatic
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// edges. Both the vertices involved in an edge need to implement this for it to
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// be able to work.
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type EdgeableRes interface {
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Res // implement everything in Res but add the additional requirements
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// AutoEdgeMeta lets you get or set meta params for the automatic edges
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// trait.
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AutoEdgeMeta() *AutoEdgeMeta
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// SetAutoEdgeMeta lets you set all of the meta params for the automatic
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// edges trait in a single call.
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SetAutoEdgeMeta(*AutoEdgeMeta)
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// UIDs includes all params to make a unique identification of this
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// object.
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UIDs() []ResUID // most resources only return one
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// AutoEdges returns a struct that implements the AutoEdge interface.
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// This interface can be used to generate automatic edges to other
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// resources.
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AutoEdges() (AutoEdge, error)
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}
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// AutoEdgeMeta provides some parameters specific to automatic edges.
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// TODO: currently this only supports disabling the feature per-resource, but in
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// the future you could conceivably have some small pattern to control it better
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type AutoEdgeMeta struct {
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// Disabled specifies that automatic edges should be disabled for this
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// resource.
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Disabled bool
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}
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// Cmp compares two AutoEdgeMeta structs and determines if they're equivalent.
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func (obj *AutoEdgeMeta) Cmp(aem *AutoEdgeMeta) error {
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if obj.Disabled != aem.Disabled {
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return fmt.Errorf("values for Disabled are different")
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}
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return nil
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}
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// The AutoEdge interface is used to implement the autoedges feature.
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type AutoEdge interface {
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Next() []ResUID // call to get list of edges to add
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Test([]bool) bool // call until false
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}
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// ResUID is a unique identifier for a resource, namely it's name, and the kind ("type").
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type ResUID interface {
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fmt.Stringer // String() string
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GetName() string
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GetKind() string
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IFF(ResUID) bool
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IsReversed() bool // true means this resource happens before the generator
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}
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// The BaseUID struct is used to provide a unique resource identifier.
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type BaseUID struct {
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Name string // name and kind are the values of where this is coming from
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Kind string
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Reversed *bool // piggyback edge information here
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}
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// GetName returns the name of the resource UID.
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func (obj *BaseUID) GetName() string {
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return obj.Name
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}
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// GetKind returns the kind of the resource UID.
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func (obj *BaseUID) GetKind() string {
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return obj.Kind
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}
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// String returns the canonical string representation for a resource UID.
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func (obj *BaseUID) String() string {
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return fmt.Sprintf("%s[%s]", obj.GetKind(), obj.GetName())
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}
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// IFF looks at two UID's and if and only if they are equivalent, returns true.
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// If they are not equivalent, it returns false.
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// Most resources will want to override this method, since it does the important
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// work of actually discerning if two resources are identical in function.
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func (obj *BaseUID) IFF(uid ResUID) bool {
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res, ok := uid.(*BaseUID)
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if !ok {
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return false
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}
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return obj.Name == res.Name
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}
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// IsReversed is part of the ResUID interface, and true means this resource
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// happens before the generator.
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func (obj *BaseUID) IsReversed() bool {
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if obj.Reversed == nil {
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panic("programming error!")
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}
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return *obj.Reversed
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}
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