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Mockito mock objects library core API and implementation
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/*
 * Copyright (c) 2017 Mockito contributors
 * This program is made available under the terms of the MIT License.
 */
package org.mockito.internal.listeners;

import java.util.List;
import java.util.Set;

import org.mockito.MockingDetails;
import org.mockito.Mockito;
import org.mockito.internal.exceptions.Reporter;
import org.mockito.internal.matchers.text.ValuePrinter;
import org.mockito.listeners.VerificationStartedEvent;
import org.mockito.listeners.VerificationStartedListener;
import org.mockito.mock.MockCreationSettings;

public final class VerificationStartedNotifier {

    public static Object notifyVerificationStarted(
            List listeners, MockingDetails originalMockingDetails) {
        if (listeners.isEmpty()) {
            return originalMockingDetails.getMock();
        }
        VerificationStartedEvent event = new Event(originalMockingDetails);
        for (VerificationStartedListener listener : listeners) {
            listener.onVerificationStarted(event);
        }
        return event.getMock();
    }

    static class Event implements VerificationStartedEvent {
        private final MockingDetails originalMockingDetails;
        private Object mock;

        public Event(MockingDetails originalMockingDetails) {
            this.originalMockingDetails = originalMockingDetails;
            this.mock = originalMockingDetails.getMock();
        }

        @Override
        public void setMock(Object mock) {
            if (mock == null) {
                throw Reporter.methodDoesNotAcceptParameter(
                        "VerificationStartedEvent.setMock", "null parameter.");
            }
            MockingDetails mockingDetails = Mockito.mockingDetails(mock);
            if (!mockingDetails.isMock()) {
                throw Reporter.methodDoesNotAcceptParameter(
                        "VerificationStartedEvent.setMock",
                        "parameter which is not a Mockito mock.\n"
                                + "  Received parameter: "
                                + ValuePrinter.print(mock)
                                + ".\n ");
            }
            MockCreationSettings originalMockSettings =
                    this.originalMockingDetails.getMockCreationSettings();
            assertCompatibleTypes(mock, originalMockSettings);
            this.mock = mock;
        }

        @Override
        public Object getMock() {
            return mock;
        }
    }

    static void assertCompatibleTypes(Object mock, MockCreationSettings originalSettings) {
        Class originalType = originalSettings.getTypeToMock();
        if (!originalType.isInstance(mock)) {
            throw Reporter.methodDoesNotAcceptParameter(
                    "VerificationStartedEvent.setMock",
                    "parameter which is not the same type as the original mock.\n"
                            + "  Required type: "
                            + originalType.getName()
                            + "\n"
                            + "  Received parameter: "
                            + ValuePrinter.print(mock)
                            + ".\n ");
        }

        for (Class iface : (Set) originalSettings.getExtraInterfaces()) {
            if (!iface.isInstance(mock)) {
                throw Reporter.methodDoesNotAcceptParameter(
                        "VerificationStartedEvent.setMock",
                        "parameter which does not implement all extra interfaces of the original mock.\n"
                                + "  Required type: "
                                + originalType.getName()
                                + "\n"
                                + "  Required extra interface: "
                                + iface.getName()
                                + "\n"
                                + "  Received parameter: "
                                + ValuePrinter.print(mock)
                                + ".\n ");
            }
        }
    }

    private VerificationStartedNotifier() {}
}