Move IconCache to SettingsLib(I).

/*

 * Copyright (C) 2018 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 com.android.settingslib.utils;

import android.content.Context;

import android.graphics.drawable.Drawable;

import android.graphics.drawable.Icon;

import android.support.annotation.VisibleForTesting;

import android.support.v4.util.ArrayMap;

/**

 * Icon cache to avoid multiple loads on the same icon.

 */

public class IconCache {

    private final Context mContext;

    @VisibleForTesting

    final ArrayMap<Icon, Drawable> mMap = new ArrayMap<>();

    public IconCache(Context context) {

        mContext = context;

    }

    public Drawable getIcon(Icon icon) {

        if (icon == null) {

            return null;

        }

        Drawable drawable = mMap.get(icon);

        if (drawable == null) {

            drawable = icon.loadDrawable(mContext);

            updateIcon(icon, drawable);

        }

        return drawable;

    }

    public void updateIcon(Icon icon, Drawable drawable) {

        mMap.put(icon, drawable);

    }

}

/*

 * Copyright (C) 2018 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 com.android.settingslib.utils;

import static com.google.common.truth.Truth.assertThat;

import static junit.framework.Assert.assertTrue;

import static org.mockito.Mockito.doReturn;

import static org.mockito.Mockito.mock;

import static org.mockito.Mockito.spy;

import static org.mockito.Mockito.times;

import static org.mockito.Mockito.verify;

import android.content.Context;

import android.graphics.drawable.Drawable;

import android.graphics.drawable.Icon;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.robolectric.RobolectricTestRunner;

import org.robolectric.RuntimeEnvironment;

@RunWith(RobolectricTestRunner.class)

public class IconCacheTest {

    private Icon mIcon;

    private Context mContext;

    private IconCache mIconCache;

    @Before

    public void setUp() {

        mContext = spy(RuntimeEnvironment.application);

        mIcon = mock(Icon.class);

        Drawable drawable = mock(Drawable.class);

        doReturn(drawable).when(mIcon).loadDrawable(mContext);

        mIconCache = new IconCache(mContext);

    }

    @Test

    public void testGetIcon_iconisNull() {

        assertThat(mIconCache.getIcon(null)).isNull();

    }

    @Test

    public void testGetIcon_iconAlreadyLoaded() {

        mIconCache.getIcon(mIcon);

        verify(mIcon, times(1)).loadDrawable(mContext);

        mIconCache.getIcon(mIcon);

        verify(mIcon, times(1)).loadDrawable(mContext);

    }

    @Test

    public void testGetIcon_iconLoadedFirstTime() {

        mIconCache.getIcon(mIcon);

        assertTrue(mIconCache.mMap.containsKey(mIcon));

    }

}