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java.lang.Object | +--ec.gp.ADFContext
ADFContext is the object pushed onto an ADF stack which represents the current context of an ADM or ADF function call, that is, how to get the argument values that argument_terminals need to return.
adf contains the relevant ADF/ADM node. If it's an ADF function call, then arguments[] contains the evaluated arguments to the ADF. If it's an ADM function call, then arguments[] is set to false.
You set up the ADFContext object for a given ADF or ADM node with the prepareADF(...) and prepareADM(...) functions.
To evaluate an argument number from an ADFContext, call evaluate(...), and the results are evaluated and copied into input.
Parameters
base.data classname, inherits and != ec.GPData |
(the class for the ADFContext's basic GPData type -- typically this is the same as GPProblem's GPData type) |
Default Base
gp.adf-context
Parameter bases
base.data | (the ADFContext's basic GPData type) |
Field Summary | |
ADF |
adf
The ADF/ADM node proper |
GPData |
arg_proto
A prototypical GPData node. |
GPData[] |
arguments
An array of GPData nodes (none of the null, when it's used) holding an ADF's arguments' return results |
static int |
INITIAL_ARGUMENT_SIZE
|
static java.lang.String |
P_ADFCONTEXT
|
static java.lang.String |
P_DATA
|
Constructor Summary | |
ADFContext()
|
Method Summary | |
Parameter |
defaultBase()
Returns the default base for this prototype. |
void |
evaluate(EvolutionState state,
int thread,
GPData input,
ADFStack stack,
GPIndividual individual,
Problem problem,
int argument)
Evaluates the argument number in the current context |
void |
prepareADF(ADF a)
Increases arguments to accommodate space if necessary. |
void |
prepareADM(ADM a)
Sets adf to a |
java.lang.Object |
protoClone()
Creates a new individual cloned from a prototype, and suitable to begin use in its own evolutionary context. |
java.lang.Object |
protoCloneSimple()
This should be implemented in a the top-level Prototype ONLY; in fact, it should probably be declared final. |
void |
setup(EvolutionState state,
Parameter base)
Sets up the object by reading it from the parameters stored in state, built off of the parameter base base. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
public static final java.lang.String P_DATA
public static final java.lang.String P_ADFCONTEXT
public static final int INITIAL_ARGUMENT_SIZE
public ADF adf
public GPData arg_proto
public GPData[] arguments
Constructor Detail |
public ADFContext()
Method Detail |
public Parameter defaultBase()
Prototype
defaultBase
in interface Prototype
public java.lang.Object protoClone() throws java.lang.CloneNotSupportedException
Prototype
The question here is whether or not this means to perform a "deep" or "light" ("shallow") clone, or something in-between. You may need to deep-clone parts of your object rather than simply copying their references, depending on the situation:
Implementations.
public Object protoClone() throws CloneNotSupportedException
{
return super.clone();
}
public Object protoClone() throws CloneNotSupportedException
{
myobj = (MyObject) (super.clone());
// put your deep-cloning code here...
// ...you should use protoClone and not
// protoCloneSimple to clone subordinate objects...
return myobj;
}
public Object protoClone() throws CloneNotSupportedException
{
MyObject myobj = (MyObject)(super.protoClone());
// put your deep-cloning code here...
// ...you should use protoClone and not
// protoCloneSimple to clone subordinate objects...
return myobj;
}
If you know that your superclasses will never change their protoClone() implementations, you might try inlining them in your overridden protoClone() method. But this is dangerous (though it yields a small net increase).
In general, you want to keep your deep cloning to an absolute minimum, so that you don't have to call protoClone() but one time.
The approach taken here is the fastest that I am aware of while still permitting objects to be specified at runtime from a parameter file. It would be faster to use the "new" operator; but that would require hard-coding that we can't do. Although using java.lang.Object.clone() entails an extra layer that deals with stripping away the "protected" keyword and also wrapping the exception handling (which is a BIG hit, about three times as slow as using "new"), it's still MUCH faster than using java.lang.Class.newInstance(), and also much faster than rolling our own Clone() method.
protoClone
in interface Prototype
public final java.lang.Object protoCloneSimple()
Prototype
public final Object protoCloneSimple()
{
try { return protoClone(); }
catch (CloneNotSupportedException e)
{ throw new InternalError(); } // never happens
}
protoCloneSimple
in interface Prototype
public void setup(EvolutionState state, Parameter base)
Prototype
For prototypes, setup(...) is typically called once for the prototype instance; cloned instances do not receive the setup(...) call. setup(...) may be called more than once; the only guarantee is that it will get called at least once on an instance or some "parent" object from which it was ultimately cloned.
setup
in interface Prototype
public void evaluate(EvolutionState state, int thread, GPData input, ADFStack stack, GPIndividual individual, Problem problem, int argument)
public final void prepareADF(ADF a)
public final void prepareADM(ADM a)
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