org.molgenis.util.ResourceUtils Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of molgenis-util Show documentation
Utility classes.
There is a newer version: 8.4.5
package org.molgenis.util;

import static java.nio.charset.StandardCharsets.UTF_8;

import com.google.common.io.Resources;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.charset.Charset;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ResourceUtils {
  private static final Logger LOG = LoggerFactory.getLogger(ResourceUtils.class);

  private ResourceUtils() {}

  public static File getFile(String resourceName) {
    URL resourceUrl = Resources.getResource(resourceName);
    return getFile(resourceUrl);
  }

  public static File getFile(Class contextClass, String resourceName) {
    URL resourceUrl = Resources.getResource(contextClass, resourceName);
    return getFile(resourceUrl);
  }

  public static String getString(String resourceName) throws IOException {
    URL resourceUrl = Resources.getResource(resourceName);
    return getString(resourceUrl, UTF_8);
  }

  public static String getString(Class contextClass, String resourceName) throws IOException {
    URL resourceUrl = Resources.getResource(contextClass, resourceName);
    return getString(resourceUrl, UTF_8);
  }

  public static String getString(Class contextClass, String resourceName, Charset charset)
      throws IOException {
    URL resourceUrl = Resources.getResource(contextClass, resourceName);
    return getString(resourceUrl, charset);
  }

  public static byte[] getBytes(String resourceName) throws IOException {
    URL resourceUrl = Resources.getResource(resourceName);
    return getBytes(resourceUrl);
  }

  public static byte[] getBytes(Class contextClass, String resourceName) throws IOException {
    URL resourceUrl = Resources.getResource(contextClass, resourceName);
    return getBytes(resourceUrl);
  }

  /**
   * Workaround for http://bugs.java.com/bugdatabase/view_bug.do?bug_id=4466485
   *
   * This workaround is not working for file resources in jars. You will get a
   * NullPointerException because the URL cannot be converted to URI.
   */
  private static File getFile(URL resourceUrl) {
    try {
      return new File(new URI(resourceUrl.toString()).getPath());
    } catch (URISyntaxException e) {
      throw new RuntimeException(e);
    } catch (NullPointerException npe) {
      LOG.error("NullPointerException is thrown. Resource url: {} ", resourceUrl);
      throw new RuntimeException(npe);
    }
  }

  private static String getString(URL resourceUrl, Charset charset) throws IOException {
    return Resources.toString(resourceUrl, charset);
  }

  private static byte[] getBytes(URL resourceUrl) throws IOException {
    return Resources.toByteArray(resourceUrl);
  }
}