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ActorProcess.java
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ActorProcess.java
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import greenfoot.*;
public abstract class ActorProcess
{
public enum Status
{
NOT_STARTED,
STARTING,
RUNNING,
SUCCESS,
FAILED,
ABORTED,
WAITING
}
protected ActorProcess child;
protected Actor owner;
private Status state = Status.NOT_STARTED;
abstract void run();
public ActorProcess()
{
}
public ActorProcess(ActorProcess child)
{
this.child = child;
}
public void setOwner(Actor owner){
this.owner = owner;
}
public final void update()
{
if (this.state == Status.NOT_STARTED)
{
this.state = Status.STARTING;
this.onStart();
}
if (this.state == Status.STARTING || this.state == Status.WAITING)
{
this.state = Status.RUNNING;
this.run();
}
if (this.state == Status.RUNNING)
{
this.state = Status.WAITING;
}
else if (this.state == Status.SUCCESS)
{
this.onSuccess();
}
else if (this.state == Status.FAILED)
{
this.onFail();
this.abortChildren();
}
}
public boolean isDone()
{
switch(this.state)
{
case ABORTED:
case FAILED:
case SUCCESS:
return true;
default:
return false;
}
}
public boolean hasChild()
{
return this.state == Status.SUCCESS && this.child != null;
}
public ActorProcess getChild()
{
if (this.child != null)
{
this.child.setOwner(this.owner);
}
return this.child;
}
public final void abort()
{
if (!this.isDone()) {
this.state = Status.ABORTED;
this.onAbort();
this.abortChildren();
}
}
protected final void fail()
{
if (this.state != Status.RUNNING) {
throwStateException();
}
this.state = Status.FAILED;
}
protected final void success()
{
if (this.state != Status.RUNNING) {
throwStateException();
}
this.state = Status.SUCCESS;
}
protected void onStart(){}
protected void onAbort(){}
protected void onSuccess(){}
protected void onFail(){}
private void abortChildren()
{
if (this.child != null)
{
this.child.abort();
}
}
private void throwStateException()
{
String error = "ActorProcess not running. Use abort() instead.";
throw new IllegalStateException(error);
}
}