EnvironmentContainer.java

package jetbrains.mps.tool.environment;

/*Generated by MPS */

import org.jetbrains.annotations.Nullable;
import org.jetbrains.annotations.NotNull;

/**
 * This class is to store the current environment (e.g used in tests, ant tasks etc.)
 * Note that there is only one possible environment at the same moment
 */
public final class EnvironmentContainer {
  private static Environment ourCurrent;

  private EnvironmentContainer() {
  }

  @Nullable
  public static synchronized Environment get() {
    return ourCurrent;
  }

  /*package*/ static synchronized void setCurrent(@NotNull Environment env) {
    if (EnvironmentContainer.ourCurrent != null) {
      throw new IllegalStateException("Another environment is active: " + EnvironmentContainer.ourCurrent);
    }
    EnvironmentContainer.ourCurrent = env;
  }

  /*package*/ static synchronized void clear() {
    if (ourCurrent == null) {
      throw new IllegalStateException("No active environment currently");
    }
    EnvironmentContainer.ourCurrent = null;
  }
}