org.solovyev.android.FileCache Maven / Gradle / Ivy

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/*
 * Copyright 2013 serso aka se.solovyev
 *
 * 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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Contact details
 *
 * Email: [email protected]
 * Site:  http://se.solovyev.org
 */

package org.solovyev.android;

import android.content.Context;
import android.os.Build;

import javax.annotation.Nonnull;
import java.io.File;

public class FileCache {

	@Nonnull
	private final File cacheDir;

	public FileCache(@Nonnull Context context, @Nonnull String cacheFileName) {
		// find the dir to save cached images
		if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) {
			cacheDir = new File(createCachePath(context), cacheFileName);
		} else {
			cacheDir = context.getCacheDir();
		}

		if (!cacheDir.exists()) {
			cacheDir.mkdirs();
		}
	}

	@Nonnull
	private String createCachePath(@Nonnull Context context) {
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO) {
			return context.getExternalCacheDir().getPath();
		} else {
			return android.os.Environment.getExternalStorageDirectory().getPath() + "/Android/data/" + context.getApplicationContext().getPackageName() + "/cache";
		}
	}

	@Nonnull
	public File getFile(@Nonnull String filename) {
		return new File(cacheDir, filename);
	}

	public void clear() {
		final File[] files = cacheDir.listFiles();
		if (files != null) {
			for (File file : files) {
				file.delete();
			}
		}
	}

}