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Mock objects library for java

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/*
 * Copyright (c) 2007 Mockito contributors
 * This program is made available under the terms of the MIT License.
 */

package org.mockito.internal.configuration.injection;

import java.lang.reflect.Field;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import static org.mockito.internal.util.Checks.checkItemsNotNull;
import static org.mockito.internal.util.Checks.checkNotNull;
import static org.mockito.internal.util.collections.Sets.newMockSafeHashSet;

/**
 * Internal injection configuration utility.
 *
 * 
 * Allow the user of this class to configure the way the injection of mocks will happen.
 * 
 *
 */
public class MockInjection {

    /**
     * Create a new configuration setup for a field
     *
     *
     * @param field Field needing mock injection
     * @param ofInstance Instance owning the field
     * @return New configuration builder
     */
    public static OngoingMockInjection onField(Field field, Object ofInstance) {
        return new OngoingMockInjection(field, ofInstance);
    }

    /**
     * Create a new configuration setup for fields
     *
     *
     * @param fields Fields needing mock injection
     * @param ofInstance Instance owning the field
     * @return New configuration builder
     */
    public static OngoingMockInjection onFields(Set fields, Object ofInstance) {
        return new OngoingMockInjection(fields, ofInstance);
    }

    /**
     * Ongoing configuration of the mock injector.
     */
    public static class OngoingMockInjection {
        private final Set fields = new HashSet();
        private final Set