ImgScroll/src/main/java/com/rarchives/ripme/ripper/AbstractJSONRipper.java

package com.rarchives.ripme.ripper;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;

import org.json.JSONObject;

import com.rarchives.ripme.ui.RipStatusMessage.STATUS;
import com.rarchives.ripme.utils.Utils;

/**
 * Simplified ripper, designed for ripping from sites by parsing JSON.
 */
public abstract class AbstractJSONRipper extends AlbumRipper {

    public AbstractJSONRipper(URL url) throws IOException {
        super(url);
    }

    public abstract String getDomain();
    public abstract String getHost();

    public abstract JSONObject getFirstPage() throws IOException;
    public JSONObject getNextPage(JSONObject doc) throws IOException {
        throw new IOException("getNextPage not implemented");
    }
    public abstract List<String> getURLsFromJSON(JSONObject json);
    public abstract void downloadURL(URL url, int index);
    public DownloadThreadPool getThreadPool() {
        return null;
    }

    public boolean keepSortOrder() {
        return true;
    }

    @Override
    public boolean canRip(URL url) {
        return url.getHost().endsWith(getDomain());
    }
    
    @Override
    public URL sanitizeURL(URL url) throws MalformedURLException {
        return url;
    }

    @Override
    public void rip() throws IOException {
        int index = 0;
        logger.info("Retrieving " + this.url);
        sendUpdate(STATUS.LOADING_RESOURCE, this.url.toExternalForm());
        JSONObject json = getFirstPage();

        while (json != null) {
            List<String> imageURLs = getURLsFromJSON(json);

            if (imageURLs.size() == 0) {
                throw new IOException("No images found at " + this.url);
            }

            for (String imageURL : imageURLs) {
                if (isStopped()) {
                    break;
                }
                index += 1;
                downloadURL(new URL(imageURL), index);
            }

            if (isStopped()) {
                break;
            }

            try {
                sendUpdate(STATUS.LOADING_RESOURCE, "next page");
                json = getNextPage(json);
            } catch (IOException e) {
                logger.info("Can't get next page: " + e.getMessage());
                break;
            }
        }

        // If they're using a thread pool, wait for it.
        if (getThreadPool() != null) {
            getThreadPool().waitForThreads();
        }
        waitForThreads();
    }

    public String getPrefix(int index) {
        String prefix = "";
        if (keepSortOrder() && Utils.getConfigBoolean("download.save_order", true)) {
            prefix = String.format("%03d_", index);
        }
        return prefix;
    }
}