/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.test;

import android.app.Activity;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

/**
 * This is common code used to support Activity test cases.  For more useful classes, please see
 * {@link android.test.ActivityUnitTestCase} and
 * {@link android.test.ActivityInstrumentationTestCase}.
 */
public abstract class ActivityTestCase extends InstrumentationTestCase {

    /**
     * The activity that will be set up for use in each test method.
     */
    private Activity mActivity;

    /**
     * @return Returns the activity under test.
     */
    protected Activity getActivity() {
        return mActivity;
    }

    /**
     * Set the activity under test.
     * @param testActivity The activity under test
     */
    protected void setActivity(Activity testActivity) {
        mActivity = testActivity;
    }

    /**
     * This function is called by various TestCase implementations, at tearDown() time, in order
     * to scrub out any class variables.  This protects against memory leaks in the case where a
     * test case creates a non-static inner class (thus referencing the test case) and gives it to
     * someone else to hold onto.
     *
     * @param testCaseClass The class of the derived TestCase implementation.
     *
     * @throws IllegalAccessException
     */
    protected void scrubClass(final Class<?> testCaseClass)
    throws IllegalAccessException {
        final Field[] fields = getClass().getDeclaredFields();
        for (Field field : fields) {
            final Class<?> fieldClass = field.getDeclaringClass();
            if (testCaseClass.isAssignableFrom(fieldClass) && !field.getType().isPrimitive()
                    && (field.getModifiers() & Modifier.FINAL) == 0) {
                try {
                    field.setAccessible(true);
                    field.set(this, null);
                } catch (Exception e) {
                    android.util.Log.d("TestCase", "Error: Could not nullify field!");
                }

                if (field.get(this) != null) {
                    android.util.Log.d("TestCase", "Error: Could not nullify field!");
                }
            }
        }
    }


}