org.catnut.plugin.zhihu.Zhihu.java Source code

Introduction

Here is the source code for org.catnut.plugin.zhihu.Zhihu.java

Source

/*
 * The MIT License (MIT)
 * Copyright (c) 2014 longkai
 * The software shall be used for good, not evil.
 */
package org.catnut.plugin.zhihu;

import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.provider.BaseColumns;
import org.catnut.R;
import org.catnut.core.CatnutApp;
import org.catnut.core.CatnutMetadata;
import org.catnut.core.CatnutProcessor;
import org.catnut.core.CatnutProvider;
import org.catnut.util.CatnutUtils;
import org.json.JSONArray;

import java.io.File;
import java.util.ArrayList;
import java.util.regex.Matcher;

/**
 * ??
 *
 * @author longkai
 */
public class Zhihu implements CatnutMetadata<JSONArray, ContentValues> {

    public static final String TABLE = "zhihus";
    public static final String SINGLE = "zhihu";
    public static final String MULTIPLE = "zhihus";

    public static final String CACHE_IMAGE_LOCATION = "plugins/zhihu";
    public static final Zhihu METADATA = new Zhihu();

    private Zhihu() {
    }

    // 
    /** id */
    public static final String QUESTION_ID = "question_id";
    /**  */
    public static final String TITLE = "title";
    /** ?? */
    public static final String DESCRIPTION = "description";

    // 
    /** id */
    public static final String ANSWER_ID = "answer_id";
    /**  */
    public static final String ANSWER = "answer";
    /** ?(?*1000) */
    public static final String LAST_ALTER_DATE = "last_alter_date";

    // 
    /** id */
    public static final String UID = "uid";
    /**  */
    public static final String NICK = "nick";
    /** ?? */
    public static final String STATUS = "status";
    /** ? */
    public static final String AVATAR = "avatar";

    // 
    /** ? */
    public static final String HAS_READ = "has_read";

    @Override
    public String ddl() {
        StringBuilder sql = new StringBuilder();
        // ?
        // _id ??id
        sql.append("CREATE TABLE ").append(TABLE).append("(").append(BaseColumns._ID).append(" int,")
                .append(QUESTION_ID).append(" int,").append(TITLE).append(" text,").append(DESCRIPTION)
                .append(" text,")

                .append(ANSWER_ID).append(" int primary key,").append(ANSWER).append(" text,")
                .append(LAST_ALTER_DATE).append(" int,")

                .append(UID).append(" text,").append(NICK).append(" text,").append(STATUS).append(" text,")
                .append(AVATAR).append(" text,").append(HAS_READ).append(" int").append(")");
        return sql.toString();
    }

    @Override
    public ContentValues convert(JSONArray array) {
        long now = System.currentTimeMillis();

        ContentValues item = new ContentValues();

        // ??item???
        item.put(BaseColumns._ID, now);

        // 
        item.put(STATUS, array.optString(1));
        item.put(ANSWER, array.optString(2));
        item.put(LAST_ALTER_DATE, array.optLong(4) * 1000);
        item.put(ANSWER_ID, array.optLong(5));

        // 
        JSONArray user = array.optJSONArray(6);
        if (user != null) {
            item.put(NICK, user.optString(0));
            item.put(UID, user.optString(1));
            item.put(AVATAR, user.optInt(2));
        }

        // 
        JSONArray question = array.optJSONArray(7);
        if (question != null) {
            item.put(TITLE, question.optString(1, null));
            item.put(DESCRIPTION, question.optString(2));
            item.put(QUESTION_ID, question.optLong(3));
        }

        return item;
    }

    /**
     * page == 1 
     *
     * @param page which page?
     * @return url
     */
    public static String fetchUrl(int page) {
        return "http://www.zhihu.com/reader/json/" + page + "?r=" + System.currentTimeMillis();
    }

    /**
     * ??
     *
     * @param context
     * @param uri
     * @return
     */
    public static Uri getCacheImageLocation(Context context, Uri uri) {
        File img = new File(context.getExternalCacheDir() + File.separator + CACHE_IMAGE_LOCATION + File.separator
                + uri.getLastPathSegment());
        return Uri.fromFile(img);
    }

    /**
     * ??
     *
     * @author longkai
     */
    public static class ZhihuProcessor implements CatnutProcessor<JSONArray> {

        private static ZhihuProcessor processor;

        private ZhihuProcessor() {
        }

        public static ZhihuProcessor getProcessor() {
            if (processor == null) {
                processor = new ZhihuProcessor();
            }
            return processor;
        }

        @Override
        public void asyncProcess(Context context, JSONArray data) throws Exception {
            ContentValues[] items = new ContentValues[data.length()];
            ArrayList<String> images = new ArrayList<String>(); // 
            Matcher matcher;
            for (int i = 0; i < items.length; i++) {
                items[i] = METADATA.convert(data.optJSONArray(i));
                matcher = ZhihuItemFragment.HTML_IMG.matcher(items[i].getAsString(Zhihu.DESCRIPTION));
                while (matcher.find()) {
                    String group = matcher.group(1);
                    images.add(group);
                }
                matcher = ZhihuItemFragment.HTML_IMG.matcher(items[i].getAsString(Zhihu.ANSWER));
                while (matcher.find()) {
                    String group = matcher.group(1);
                    images.add(group);
                }
            }
            context.getContentResolver().bulkInsert(CatnutProvider.parse(MULTIPLE), items);
            if (CatnutApp.getBoolean(R.string.pref_enable_cache_zhihu_images, R.bool.default_plugin_status)) {
                try {
                    String location = CatnutUtils.mkdir(context, Zhihu.CACHE_IMAGE_LOCATION);
                    Intent intent = new Intent(context, ImagesDownloader.class);
                    intent.putExtra(ImagesDownloader.LOCATION, location);
                    intent.putStringArrayListExtra(ImagesDownloader.URLS, images);
                    context.startService(intent);
                } catch (Exception e) {
                    // no-op, just quit download the images...
                }
            }
        }
    }
}