NumberResolver.java

/*
 * Copyright 2015-2017 the original author or authors.
 *
 * All rights reserved. This program and the accompanying materials are
 * made available under the terms of the Eclipse Public License v1.0 which
 * accompanies this distribution and is available at
 *
 * http://www.eclipse.org/legal/epl-v10.html
 */

package org.junit.jupiter.engine.bridge;

import org.junit.jupiter.api.extension.ExtensionContext;
import org.junit.jupiter.api.extension.ParameterContext;
import org.junit.jupiter.api.extension.ParameterResolutionException;
import org.junit.jupiter.api.extension.ParameterResolver;

/**
 * @since 5.0
 */
class NumberResolver implements ParameterResolver {

	@Override
	public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext)
			throws ParameterResolutionException {

		return Number.class.isAssignableFrom(parameterContext.getParameter().getType());
	}

	@Override
	public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext)
			throws ParameterResolutionException {

		Class<?> type = parameterContext.getParameter().getType();
		if (type == Number.class) {
			return 42;
		}
		try {
			return type.getMethod("valueOf", String.class).invoke(null, "123");
		}
		catch (Exception e) {
			throw new AssertionError("Could not resolve number type: " + type, e);
		}
	}

}