@Override
public ExprTree mutateExprTree(ExprTree ptree, ExprTreeSchema schema, IRandGen randgen) {
// Copy of expr
ExprTree stree = ptree.copy();
// Node selection
int selectIndex = randgen.choose(0, ptree.size());
// Mutated node
IPrimitive oldBlock = stree.getBlock(selectIndex);
Class<?> rtype = oldBlock.returnType();
int arity = oldBlock.argumentTypes().length;
IPrimitive newBlock = schema.getAnyBlock(rtype, randgen, arity);
stree.setBlock(newBlock, selectIndex);
// Return result
return stree;
}
@Override
protected void createParents() {
parents = new ArrayList<IIndividual>();
// Parent genotype
ExprTree genotype = new ExprTree();
genotype.addBlock(new Add());
genotype.addBlock(new X());
genotype.addBlock(new Sub());
genotype.addBlock(new Mul());
genotype.addBlock(new Add());
genotype.addBlock(new X());
genotype.addBlock(new Y());
genotype.addBlock(new Y());
genotype.addBlock(new Z());
// Add individual to the parents set
parents.add(new ExprTreeIndividual(genotype));
}
@Override
protected void createExpected() {
expected = new ArrayList<IIndividual>();
// Mutated individual genotype
ExprTree genotype = new ExprTree();
genotype.addBlock(new Add());
genotype.addBlock(new X());
genotype.addBlock(new Add());
genotype.addBlock(new Sub());
genotype.addBlock(new X());
genotype.addBlock(new Y());
genotype.addBlock(new Z());
// Add individual to expected set
expected.add(new ExprTreeIndividual(genotype));
}