app/src/main/java/me/zhanghai/android/douya/util/DiskCache.java

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/*
 * Copyright (c) 2015 Zhang Hai <Dreaming.in.Code.ZH@Gmail.com>
 * All Rights Reserved.
 */

package me.zhanghai.android.douya.util;

import android.util.LruCache;

import com.google.gson.JsonParseException;
import com.google.gson.reflect.TypeToken;
import com.jakewharton.disklrucache.DiskLruCache;

import java.io.BufferedWriter;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.lang.reflect.Type;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class DiskCache {

    private DiskLruCache mCache;
    private SafeKeyGenerator mSafeKeyGenerator = new SafeKeyGenerator();

    private DiskCache(DiskLruCache cache) {
        mCache = cache;
    }

    public static DiskCache openOrThrow(File directory, int version, long maxSize)
            throws IOException {
        return new DiskCache(DiskLruCache.open(directory, version, 1, maxSize));
    }

    public static DiskCache open(File directory, int version, long maxSize) {
        try {
            return openOrThrow(directory, version, maxSize);
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

    private DiskLruCache.Snapshot getOrThrow(String key) throws IOException, NullPointerException {
        DiskLruCache.Snapshot snapshot = mCache.get(mSafeKeyGenerator.getSafeKey(key));
        if (snapshot == null) {
            throw new NullPointerException("DiskLruCache.get() returned null");
        }
        return snapshot;
    }

    public InputStream getInputStreamOrThrow(String key) throws IOException, NullPointerException {
        return getOrThrow(key).getInputStream(0);
    }