Android Open Source - Android-Universal-Image-Loader Limited Age Disk Cache

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License

The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2011-2014 Sergey Tarasevich
 */*from ww w .  j a  v  a2 s  .com*/
 * 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.nostra13.universalimageloader.cache.disc.impl;

import android.graphics.Bitmap;
import com.nostra13.universalimageloader.cache.disc.naming.FileNameGenerator;
import com.nostra13.universalimageloader.core.DefaultConfigurationFactory;
import com.nostra13.universalimageloader.utils.IoUtils;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 * Cache which deletes files which were loaded more than defined time. Cache size is unlimited.
 *
 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
 * @since 1.3.1
 */
public class LimitedAgeDiskCache extends BaseDiskCache {

  private final long maxFileAge;

  private final Map<File, Long> loadingDates = Collections.synchronizedMap(new HashMap<File, Long>());

  /**
   * @param cacheDir Directory for file caching
   * @param maxAge   Max file age (in seconds). If file age will exceed this value then it'll be removed on next
   *                 treatment (and therefore be reloaded).
   */
  public LimitedAgeDiskCache(File cacheDir, long maxAge) {
    this(cacheDir, null, DefaultConfigurationFactory.createFileNameGenerator(), maxAge);
  }

  /**
   * @param cacheDir Directory for file caching
   * @param maxAge   Max file age (in seconds). If file age will exceed this value then it'll be removed on next
   *                 treatment (and therefore be reloaded).
   */
  public LimitedAgeDiskCache(File cacheDir, File reserveCacheDir, long maxAge) {
    this(cacheDir, reserveCacheDir, DefaultConfigurationFactory.createFileNameGenerator(), maxAge);
  }

  /**
   * @param cacheDir          Directory for file caching
   * @param reserveCacheDir   null-ok; Reserve directory for file caching. It's used when the primary directory isn't available.
   * @param fileNameGenerator Name generator for cached files
   * @param maxAge            Max file age (in seconds). If file age will exceed this value then it'll be removed on next
   *                          treatment (and therefore be reloaded).
   */
  public LimitedAgeDiskCache(File cacheDir, File reserveCacheDir, FileNameGenerator fileNameGenerator, long maxAge) {
    super(cacheDir, reserveCacheDir, fileNameGenerator);
    this.maxFileAge = maxAge * 1000; // to milliseconds
  }

  @Override
  public File get(String imageUri) {
    File file = super.get(imageUri);
    if (file != null && file.exists()) {
      boolean cached;
      Long loadingDate = loadingDates.get(file);
      if (loadingDate == null) {
        cached = false;
        loadingDate = file.lastModified();
      } else {
        cached = true;
      }

      if (System.currentTimeMillis() - loadingDate > maxFileAge) {
        file.delete();
        loadingDates.remove(file);
      } else if (!cached) {
        loadingDates.put(file, loadingDate);
      }
    }
    return file;
  }

  @Override
  public boolean save(String imageUri, InputStream imageStream, IoUtils.CopyListener listener) throws IOException {
    boolean saved = super.save(imageUri, imageStream, listener);
    rememberUsage(imageUri);
    return saved;
  }

  @Override
  public boolean save(String imageUri, Bitmap bitmap) throws IOException {
    boolean saved = super.save(imageUri, bitmap);
    rememberUsage(imageUri);
    return saved;
  }

  @Override
  public boolean remove(String imageUri) {
    loadingDates.remove(getFile(imageUri));
    return super.remove(imageUri);
  }

  @Override
  public void clear() {
    super.clear();
    loadingDates.clear();
  }

  private void rememberUsage(String imageUri) {
    File file = getFile(imageUri);
    long currentTime = System.currentTimeMillis();
    file.setLastModified(currentTime);
    loadingDates.put(file, currentTime);
  }
}

Java Source Code List

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