CameraInfoLoader.java

package org.droidplanner.services.android.impl.utils.file.IO;

import android.content.Context;

import org.droidplanner.services.android.impl.core.survey.CameraInfo;
import com.o3dr.android.client.utils.FileUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;

public class CameraInfoLoader {

    private static final String CAMERA_INFO_ASSESTS_FOLDER = "CameraInfo";
    private Context context;
    private HashMap<String, String> filesInSdCard = new HashMap<String, String>();
    private HashMap<String, String> filesInAssets = new HashMap<String, String>();

    public CameraInfoLoader(Context context) {
        this.context = context;
    }

    public CameraInfo openFile(String file) throws Exception {
        if (filesInSdCard.containsKey(file)) {
            return readSdCardFile(file);
        } else if (filesInAssets.containsKey(file)) {
            return readAssetsFile(file);
        } else {
            throw new FileNotFoundException();
        }
    }

    private CameraInfo readSdCardFile(String file) throws Exception {
        CameraInfoReader reader = new CameraInfoReader();
        InputStream inputStream = new FileInputStream(filesInSdCard.get(file));
        reader.openFile(inputStream);
        inputStream.close();
        return reader.getCameraInfo();
    }

    private CameraInfo readAssetsFile(String file) throws Exception {
        CameraInfoReader reader = new CameraInfoReader();
        InputStream inputStream = context.getAssets().open(filesInAssets.get(file));
        reader.openFile(inputStream);
        inputStream.close();
        return reader.getCameraInfo();
    }

    public List<String> getCameraInfoList() {
        ArrayList<String> avaliableCameras = new ArrayList<String>();
        List<String> cameraInfoListFromStorage = getCameraInfoListFromStorage();
        avaliableCameras.addAll(cameraInfoListFromStorage);
        List<String> cameraInfoListFromAssets = getCameraInfoListFromAssets();
        avaliableCameras.addAll(cameraInfoListFromAssets);
        return avaliableCameras;
    }

    private List<String> getCameraInfoListFromAssets() {
        try {
            String[] list = context.getAssets().list(CAMERA_INFO_ASSESTS_FOLDER);
            filesInAssets.clear();
            for (String string : list) {
                filesInAssets.put(string, CAMERA_INFO_ASSESTS_FOLDER + "/" + string);
            }
            return Arrays.asList(list);

        } catch (IOException e) {
            return new ArrayList<String>();
        }
    }

    private List<String> getCameraInfoListFromStorage() {
        List<String> filesName = new ArrayList<>();
        filesInSdCard.clear();

        File[] filesList = FileUtils.getCameraInfoFileList(this.context);
        if(filesList != null && filesList.length > 0) {
            for (File file : filesList) {
                final String filename = file.getName();
                filesName.add(filename);
                filesInSdCard.put(filename, file.getAbsolutePath());
            }
        }
        return filesName;
    }
}