org.robolectric.shadows.ShadowTimeZoneFinder Maven / Gradle / Ivy

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package org.robolectric.shadows;

import static android.os.Build.VERSION_CODES.O;
import static android.os.Build.VERSION_CODES.P;
import static java.nio.charset.StandardCharsets.UTF_8;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.robolectric.annotation.Implementation;
import org.robolectric.annotation.Implements;
import org.robolectric.util.ReflectionHelpers;
import org.robolectric.util.ReflectionHelpers.ClassParameter;

/** Shadow of TimeZoneFinder for Android O and P. */
@Implements(
    className = "libcore.util.TimeZoneFinder",
    minSdk = O,
    maxSdk = P,
    isInAndroidSdk = false,
    looseSignatures = true)
public class ShadowTimeZoneFinder {

  private static final String TZLOOKUP_PATH = "/usr/share/zoneinfo/tzlookup.xml";

  @Implementation
  protected static Object getInstance() {
    try {
      return ReflectionHelpers.callStaticMethod(
          Class.forName("libcore.util.TimeZoneFinder"),
          "createInstanceForTests",
          ClassParameter.from(String.class, readTzlookup()));
    } catch (ClassNotFoundException e) {
      throw new RuntimeException(e);
    }
  }

  /**
   * Reads tzlookup.xml from the files bundled inside android-all JARs. We need to read the file
   * instead of passing in the path because the real implementation uses {@link java.nio.file.Paths}
   * which doesn't support reading from JARs.
   */
  public static String readTzlookup() {
    StringBuilder stringBuilder = new StringBuilder();
    InputStream is = null;
    try {
      try {
        is = ShadowTimeZoneFinder.class.getResourceAsStream(TZLOOKUP_PATH);
        BufferedReader reader = new BufferedReader(new InputStreamReader(is, UTF_8));
        for (String line; (line = reader.readLine()) != null; ) {
          stringBuilder.append(line);
        }
      } finally {
        if (is != null) {
          is.close();
        }
      }
    } catch (IOException e) {
      // ignore
    }

    return stringBuilder.toString();
  }
}