com.richtodd.android.repository.FileRepositoryContainerProvider.java Source code

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Here is the source code for com.richtodd.android.repository.FileRepositoryContainerProvider.java

Source

/* Copyright (c) 2013 Richard G. Todd.
 * Licensed under the terms of the GNU General Public License (GPL) Version 3.0.
 */

package com.richtodd.android.repository;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.json.JSONObject;

import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;

public class FileRepositoryContainerProvider implements RepositoryContainerProvider {

    private static final String THUMBNAIL_PREFIX = "thumbnail-";

    private File m_folderFile;
    private ThumbnailProvider m_thumbnailProvider;

    public FileRepositoryContainerProvider(File folderFile, ThumbnailProvider thumbnailProvider) {
        m_folderFile = folderFile;
        m_thumbnailProvider = thumbnailProvider;
    }

    @Override
    public String getContainerName() {
        return m_folderFile.getName();
    }

    @Override
    public List<RepositoryObjectProvider> getObjects(boolean loadThumbnails) {
        ArrayList<RepositoryObjectProvider> m_entries = new ArrayList<RepositoryObjectProvider>();

        // List and process thumbnails.
        //
        HashMap<String, File> thumbnails = new HashMap<String, File>();
        if (loadThumbnails) {
            File[] thumbnailFiles = listFiles(true);
            for (int i = 0; i < thumbnailFiles.length; ++i) {
                File thumbnailFile = thumbnailFiles[i];
                String themeName = thumbnailFile.getName().substring(THUMBNAIL_PREFIX.length());

                thumbnails.put(themeName, thumbnailFile);
            }
        }

        // List and process theme files.
        //
        File[] objectFiles = listFiles(false);
        for (int i = 0; i < objectFiles.length; ++i) {
            File objectFile = objectFiles[i];
            String objectName = objectFile.getName();
            File thumbnailFile = thumbnails.get(objectName);

            FileRepositoryObjectProvider entry;

            if (thumbnailFile != null) {
                entry = new FileRepositoryObjectProvider(objectFile, thumbnailFile);
            } else if (loadThumbnails) {
                entry = new FileRepositoryObjectProvider(objectFile, m_thumbnailProvider);
            } else {
                entry = new FileRepositoryObjectProvider(objectFile, (Bitmap) null);
            }

            m_entries.add(entry);
        }

        return m_entries;
    }

    @Override
    public RepositoryObjectProvider getObject(String objectName, boolean loadThumbnail) {
        File objectFile = new File(m_folderFile, objectName);
        File thumbnailFile = new File(m_folderFile, THUMBNAIL_PREFIX + objectName);
        if (thumbnailFile.exists()) {
            return new FileRepositoryObjectProvider(objectFile, thumbnailFile);
        } else if (loadThumbnail) {
            return new FileRepositoryObjectProvider(objectFile, m_thumbnailProvider);
        } else {
            return new FileRepositoryObjectProvider(objectFile, (Bitmap) null);
        }
    }

    @Override
    public void createObject(String objectName, JSONObject object, Bitmap thumbnail) throws RepositoryException {
        File objectFile = new File(m_folderFile, objectName);
        JSONUtility.saveJSONObject(objectFile, object);

        if (thumbnail == null && m_thumbnailProvider != null) {
            thumbnail = m_thumbnailProvider.getThumbnail(object);
        }
        if (thumbnail != null) {
            File thumbnailFile = new File(m_folderFile, THUMBNAIL_PREFIX + objectName);
            saveBitmap(thumbnailFile, thumbnail);
        }
    }

    @Override
    public void deleteObject(String objectName) {
        File objectFile = new File(m_folderFile, objectName);
        objectFile.delete();

        File thumbnailFile = new File(m_folderFile, THUMBNAIL_PREFIX + objectName);
        thumbnailFile.delete();
    }

    @Override
    public boolean objectExists(String objectName) {
        File objectFile = new File(m_folderFile, objectName);
        return objectFile.exists();
    }

    @Override
    public void clear() {
        File[] files = m_folderFile.listFiles();
        for (File file : files) {
            file.delete();
        }
    }

    @Override
    public int getCount() throws RepositoryException {
        return m_folderFile.list().length;
    }

    private File[] listFiles(boolean listThumbnails) {

        final boolean localListThumbnails = listThumbnails;

        File[] files = m_folderFile.listFiles(new FilenameFilter() {
            @Override
            public boolean accept(File dir, String filename) {
                return localListThumbnails == filename.startsWith(THUMBNAIL_PREFIX);
            }
        });

        return files;
    }

    private void saveBitmap(File file, Bitmap bitmap) throws RepositoryException {
        try {
            OutputStream out = new FileOutputStream(file);
            try {
                bitmap.compress(CompressFormat.PNG, 100, out);
            } finally {
                out.close();
            }
        } catch (FileNotFoundException ex) {
            throw new RepositoryException(ex);
        } catch (IOException ex) {
            throw new RepositoryException(ex);
        }
    }
}