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package jcgp.backend.population;
import java.util.ArrayList;
/**
* This is a chromosome output. Outputs are a special
* type of mutable element with a single connection. It
* returns the value of its single connection, but it
* may not be connected to - it terminates a chromosome
* active connection path.
* <br><br>
* When mutating an output, it is easiest to use {@code mutate()}.
* Alternatively, you may also perform a specific mutation using
* {@code setSource(...)}.
*
* @author Eduardo Pedroni
*
*/
public class Output implements Mutable {
private Connection source;
private Chromosome chromosome;
private int index;
/**
* Makes a new instance of {@code Output} with the
* specified arguments.
*
* @param chromosome the chromosome this output belongs to.
* @param index the output index.
*/
public Output(Chromosome chromosome, int index) {
this.chromosome = chromosome;
this.index = index;
}
/**
* @return the value of the output's source.
*/
public Object calculate() {
return source.getValue();
}
/**
* @return this output's index.
*/
public int getIndex() {
return index;
}
/**
* This method sets the output source to the specified connection.
*
* @param newConnection the {@code Connection} to connect to.
*/
public void setSource(Connection newConnection) {
source = newConnection;
// trigger active path recomputation
chromosome.recomputeActiveNodes();
}
/**
* @return the source of this output's value.
*/
public Connection getSource() {
return source;
}
/**
* Calls {@code getActive(...)} on this output's
* source. This kicks off a recursive process whereby
* all nodes connected to this output are added to the
* specified list of nodes. This is used to create a
* list of all active nodes.
*
* @param activeNodes the list to add all active nodes to.
*/
public void getActiveNodes(ArrayList<Node> activeNodes) {
// do not add if the source is an input
if (source instanceof Node) {
((Node) source).getActive(activeNodes);
}
}
@Override
public boolean copyOf(Mutable m) {
// both cannot be the same instance
if (this != m) {
// element must be instance of output
if (m instanceof Output) {
Output o = (Output) m;
// index must be the same
if (index == o.getIndex()) {
// source must be the same
if (source != o.getSource()) {
if (source instanceof Input && o.getSource() instanceof Input) {
if (((Input) source).getIndex() == ((Input) o.getSource()).getIndex()) {
return true;
}
} else if (source instanceof Node && o.getSource() instanceof Node) {
if (((Node) source).getRow() == ((Node) o.getSource()).getRow() &&
((Node) source).getColumn() == ((Node) o.getSource()).getColumn()) {
return true;
}
}
}
}
}
}
return false;
}
@Override
public void mutate() {
// simply change output to a new, random connection
setSource(chromosome.getRandomConnection());
}
@Override
public String toString() {
return "Output " + index;
}
}
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