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package jcgp.backend.modules.problem;
import java.io.File;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import jcgp.backend.parsers.TestCaseParser;
import jcgp.backend.population.Population;
import jcgp.backend.resources.ModifiableResources;
import jcgp.backend.resources.Resources;
/**
* Abstract model for a problem that uses test cases. A test case
* problem is any problem that compares the chromosome output to
* an expected output taken from a table of input-output mappings.
* <br><br>
* This class defines a basic data type for storing test cases,
* TestCase, and provides core functionality to add and manipulate
* test cases in the problem. A subclass of {@code TestCaseProblem}
* must simply override {@code parseTestCase()} to convert parsed
* problem data strings into the required data type (T).
*
* @see Problem
* @author Eduardo Pedroni
* @param <T> the data type to be used by the TestCaseProblem.
*/
public abstract class TestCaseProblem<T> extends Problem {
/**
* Basic data type for encapsulating test cases, it simply
* contains arrays of inputs and outputs and associated getters.
*
* @author Eduardo Pedroni
* @param <U> the data type of the test case.
*/
public static class TestCase<U> {
private U[] inputs;
private U[] outputs;
/**
* Creates a new test case, inputs and outputs
* must be specified upon instantiation.
*
* @param inputs the array of inputs.
* @param outputs the array of outputs.
*/
public TestCase(U[] inputs, U[] outputs) {
this.inputs = inputs;
this.outputs = outputs;
}
/**
* @return the complete array of inputs.
*/
public U[] getInputs() {
return inputs;
}
/**
* @return the complete array of outputs.
*/
public U[] getOutputs() {
return outputs;
}
}
protected ObservableList<TestCase<T>> testCases;
/**
* Creates a new TestCaseProblem object.
*
* @param resources a reference to the experiment's resources.
*/
public TestCaseProblem(Resources resources) {
super(resources);
testCases = FXCollections.observableArrayList();
}
/**
* For internal use only, this method computes and returns the maximum fitness
* based on the number of test cases. Subclasses should override this method
* as necessary.
*
* @return the maximum fitness based on number of test cases.
*/
protected double getMaxFitness() {
int fitness = 0;
for (TestCase<T> tc : testCases) {
fitness += tc.getOutputs().length;
}
return fitness;
}
/**
* @return a list containing the test cases.
*/
public ObservableList<TestCase<T>> getTestCases() {
return testCases;
}
/**
* This method is used internally by {@code addTestCase()} in order
* to appropriately parse strings into the right data type for the
* test cases. Since the data type is problem-dependent, subclasses must
* implement this method. This method must return a built {@code TestCase}
* object from the arguments given.
*
* @param inputs the inputs represented as strings.
* @param outputs the outputs represented as strings.
* @return the parsed test case.
*/
protected abstract TestCase<T> parseTestCase(String[] inputs, String[] outputs);
/**
* Adds test cases to the problem instance as they get parsed from a
* problem data file. This template method uses {@code parseTestCase}, which
* must be implemented by subclasses.
*
* @param inputs the inputs represented as strings.
* @param outputs the outputs represented as strings.
*/
public final void addTestCase(String[] inputs, String[] outputs) {
TestCase<T> testCase = parseTestCase(inputs, outputs);
if (testCase.getInputs().length != getResources().inputs()) {
throw new IllegalArgumentException("Received test case with " + testCase.getInputs().length +
" inputs but need exactly " + getResources().inputs());
} else if (testCase.getOutputs().length != getResources().outputs()) {
throw new IllegalArgumentException("Received test case with " + testCase.getOutputs().length +
" outputs but need exactly " + getResources().outputs());
} else {
this.testCases.add(testCase);
maxFitness.set(getMaxFitness());
}
}
/**
* Remove all test cases.
*/
public void clearTestCases() {
testCases.clear();
maxFitness.set(getMaxFitness());
}
@Override
public void parseProblemData(File file, ModifiableResources resources) {
// use standard test case parser for this
TestCaseParser.parse(file, this, resources);
}
@Override
public int hasImprovement(Population population) {
for (int i = 0; i < getResources().populationSize(); i++) {
if (getFitnessOrientation() == BestFitness.HIGH) {
if (population.get(i).getFitness() > bestFitness.get()) {
bestFitness.set(population.get(i).getFitness());
return i;
}
} else {
if (population.get(i).getFitness() < bestFitness.get()) {
bestFitness.set(population.get(i).getFitness());
return i;
}
}
}
return -1;
}
}
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