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package org.apache.james.container.spring.filesystem;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import org.apache.james.container.spring.resource.JamesResourceLoader;
import org.apache.james.filesystem.api.FileSystem;
import org.springframework.context.ResourceLoaderAware;
import org.springframework.core.io.ResourceLoader;

public class ResourceLoaderFileSystem implements FileSystem, ResourceLoaderAware {

    private ResourceLoader loader;

    @Override
    public InputStream getResource(String url) throws IOException {
        return loader.getResource(url).getInputStream();
    }

    @Override
    public File getFile(String fileURL) throws FileNotFoundException {
        try {
            return loader.getResource(fileURL).getFile();
        } catch (IOException e) {
            throw new FileNotFoundException("Could not load file " + fileURL);
        }
    }

    @Override
    public File getBasedir() throws FileNotFoundException {
        try {
            return loader.getResource(".").getFile();
        } catch (IOException e) {
            throw new FileNotFoundException("Could not access base directory");
        }
    }


    @Override
    public File getFileWithinBaseDir(String fileURL) throws IOException {
        File file = getFile(fileURL);
        if (loader instanceof JamesResourceLoader) {
            ((JamesResourceLoader) loader).validate(file);
            return file;
        } else {
            return FileSystem.super.getFileWithinBaseDir(fileURL);
        }
    }

    @Override
    public void setResourceLoader(ResourceLoader loader) {
        this.loader = loader;
    }

}