package org.checkerframework.javacutil.trees;

import com.sun.source.tree.VariableTree;
import com.sun.tools.javac.code.Symbol;
import com.sun.tools.javac.code.Type;
import com.sun.tools.javac.util.Name;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A DetachedVarSymbol represents a variable that is not part of any AST Tree. DetachedVarSymbols
 * are created when desugaring source code constructs and they carry important type information, but
 * some methods such as TreeInfo.declarationFor do not work on them.
 */
public class DetachedVarSymbol extends Symbol.VarSymbol {

  protected @Nullable VariableTree decl;

  /** Construct a detached variable symbol, given its flags, name, type and owner. */
  public DetachedVarSymbol(long flags, Name name, Type type, Symbol owner) {
    super(flags, name, type, owner);
    this.decl = null;
  }

  /** Set the declaration tree for the variable. */
  public void setDeclaration(VariableTree decl) {
    this.decl = decl;
  }

  /** Get the declaration tree for the variable. */
  public @Nullable VariableTree getDeclaration() {
    return decl;
  }
}