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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Copyright 2016 Leszek Koltunski //
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// //
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// This file is part of Distorted. //
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// //
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// Distorted 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 2 of the License, or //
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// (at your option) any later version. //
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// //
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// Distorted 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 Distorted. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////////////////////
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package org.distorted.library;
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import java.util.ArrayList;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* This static class handles changing topology of a Tree in a safe way. I.e. if one wants to
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* attach() a new Node somewhere in the Tree, we cannot simply attach it mid-render (detach() is
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* even worse!). What we do instead is mark that this job will have to be done and actually do it
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* just before the next render. That's what this Daemon does.
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*/
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class DistortedAttachDaemon
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{
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private static final int ATTACH = 0; //
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private static final int DETACH = 1; // types of jobs that the Daemon can do
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private static final int DETACHALL = 2; //
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private static class Job
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{
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int type;
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DistortedAttacheable attacheable;
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DistortedNode object;
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Job(int t, DistortedAttacheable a, DistortedNode o)
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{
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type = t;
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attacheable = a;
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object = o;
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}
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}
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private static ArrayList<Job> mJobs = new ArrayList<>();
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private DistortedAttachDaemon()
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{
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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static boolean toDo()
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{
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int num = mJobs.size();
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Job job;
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for(int i=0; i<num; i++)
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{
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job = mJobs.remove(0);
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switch(job.type)
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{
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case ATTACH : job.attacheable.attachNow(job.object);
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break;
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case DETACH : job.attacheable.detachNow(job.object);
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break;
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case DETACHALL: job.attacheable.detachAllNow() ;
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break;
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default : android.util.Log.e("AttachDaemon", "what?");
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}
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}
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return ( num>0 );
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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static void attach(DistortedAttacheable a, DistortedNode n)
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{
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mJobs.add(new Job(ATTACH,a,n));
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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static void detach(DistortedAttacheable a, DistortedNode n)
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{
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mJobs.add(new Job(DETACH,a,n));
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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static void detachAll(DistortedAttacheable a)
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{
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mJobs.add(new Job(DETACHALL,a,null));
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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static void onDestroy()
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{
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mJobs.clear();
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}
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}
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