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package org.junit.experimental.theories.internal;
import static java.util.Collections.emptyList;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import org.junit.experimental.theories.ParameterSignature;
import org.junit.experimental.theories.ParameterSupplier;
import org.junit.experimental.theories.ParametersSuppliedBy;
import org.junit.experimental.theories.PotentialAssignment;
import org.junit.experimental.theories.PotentialAssignment.CouldNotGenerateValueException;
import org.junit.runners.model.TestClass;
/**
* A potentially incomplete list of value assignments for a method's formal
* parameters
*/
public class Assignments {
private final List<PotentialAssignment> assigned;
private final List<ParameterSignature> unassigned;
private final TestClass clazz;
private Assignments(List<PotentialAssignment> assigned,
List<ParameterSignature> unassigned, TestClass clazz) {
this.unassigned = unassigned;
this.assigned = assigned;
this.clazz = clazz;
}
/**
* Returns a new assignment list for {@code testMethod}, with no params
* assigned.
*/
public static Assignments allUnassigned(Method testMethod,
TestClass testClass) {
List<ParameterSignature> signatures;
signatures = ParameterSignature.signatures(testClass
.getOnlyConstructor());
signatures.addAll(ParameterSignature.signatures(testMethod));
return new Assignments(new ArrayList<PotentialAssignment>(),
signatures, testClass);
}
public boolean isComplete() {
return unassigned.size() == 0;
}
public ParameterSignature nextUnassigned() {
return unassigned.get(0);
}
public Assignments assignNext(PotentialAssignment source) {
List<PotentialAssignment> assigned = new ArrayList<PotentialAssignment>(
this.assigned);
assigned.add(source);
return new Assignments(assigned, unassigned.subList(1,
unassigned.size()), clazz);
}
public Object[] getActualValues(int start, int stop)
throws CouldNotGenerateValueException {
Object[] values = new Object[stop - start];
for (int i = start; i < stop; i++) {
values[i - start] = assigned.get(i).getValue();
}
return values;
}
public List<PotentialAssignment> potentialsForNextUnassigned()
throws Throwable {
ParameterSignature unassigned = nextUnassigned();
List<PotentialAssignment> assignments = getSupplier(unassigned).getValueSources(unassigned);
if (assignments.size() == 0) {
assignments = generateAssignmentsFromTypeAlone(unassigned);
}
return assignments;
}
private List<PotentialAssignment> generateAssignmentsFromTypeAlone(ParameterSignature unassigned) {
Class<?> paramType = unassigned.getType();
if (paramType.isEnum()) {
return new EnumSupplier(paramType).getValueSources(unassigned);
} else if (paramType.equals(Boolean.class) || paramType.equals(boolean.class)) {
return new BooleanSupplier().getValueSources(unassigned);
} else {
return emptyList();
}
}
private ParameterSupplier getSupplier(ParameterSignature unassigned)
throws Exception {
ParametersSuppliedBy annotation = unassigned
.findDeepAnnotation(ParametersSuppliedBy.class);
if (annotation != null) {
return buildParameterSupplierFromClass(annotation.value());
} else {
return new AllMembersSupplier(clazz);
}
}
private ParameterSupplier buildParameterSupplierFromClass(
Class<? extends ParameterSupplier> cls) throws Exception {
Constructor<?>[] supplierConstructors = cls.getConstructors();
for (Constructor<?> constructor : supplierConstructors) {
Class<?>[] parameterTypes = constructor.getParameterTypes();
if (parameterTypes.length == 1
&& parameterTypes[0].equals(TestClass.class)) {
return (ParameterSupplier) constructor.newInstance(clazz);
}
}
return cls.newInstance();
}
public Object[] getConstructorArguments()
throws CouldNotGenerateValueException {
return getActualValues(0, getConstructorParameterCount());
}
public Object[] getMethodArguments() throws CouldNotGenerateValueException {
return getActualValues(getConstructorParameterCount(), assigned.size());
}
public Object[] getAllArguments() throws CouldNotGenerateValueException {
return getActualValues(0, assigned.size());
}
private int getConstructorParameterCount() {
List<ParameterSignature> signatures = ParameterSignature
.signatures(clazz.getOnlyConstructor());
int constructorParameterCount = signatures.size();
return constructorParameterCount;
}
public Object[] getArgumentStrings(boolean nullsOk)
throws CouldNotGenerateValueException {
Object[] values = new Object[assigned.size()];
for (int i = 0; i < values.length; i++) {
values[i] = assigned.get(i).getDescription();
}
return values;
}
}
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