LazyParentScope.java

package jetbrains.mps.lang.scopes.runtime;

/*Generated by MPS */

import org.jetbrains.mps.openapi.model.SNode;
import org.jetbrains.mps.openapi.language.SAbstractConcept;
import jetbrains.mps.scope.Scope;
import jetbrains.mps.scope.EmptyScope;

public class LazyParentScope extends DelegatingScope {
  private final SNode node;
  private final SAbstractConcept kind;
  private Scope scope;
  private boolean isCalculated = false;
  public LazyParentScope(SNode node, SAbstractConcept kind) {
    this.node = node;
    this.kind = kind;
  }
  @Override
  protected Scope getScope() {
    if (!(isCalculated)) {
      scope = ScopeUtils.parentScope(node, kind);
      // todo: think about this case... 
      if (scope == null) {
        scope = new EmptyScope();
      }
      isCalculated = true;
    }
    return scope;
  }
}