package org.checkerframework.dataflow.cfg.node;

import com.sun.source.tree.LiteralTree;
import com.sun.source.tree.Tree;
import java.util.Collection;
import java.util.Collections;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A node for a character literal. For example:
 *
 * <pre>
 *   <em>'a'</em>
 *   <em>'\t'</em>
 *   <em>'\u03a9'</em>
 * </pre>
 */
public class CharacterLiteralNode extends ValueLiteralNode {

  /**
   * Create a new CharacterLiteralNode.
   *
   * @param t the character literal
   */
  public CharacterLiteralNode(LiteralTree t) {
    super(t);
    assert t.getKind() == Tree.Kind.CHAR_LITERAL;
  }

  @Override
  public Character getValue() {
    return (Character) tree.getValue();
  }

  @Override
  public <R, P> R accept(NodeVisitor<R, P> visitor, P p) {
    return visitor.visitCharacterLiteral(this, p);
  }

  @Override
  public boolean equals(@Nullable Object obj) {
    // test that obj is a CharacterLiteralNode
    if (!(obj instanceof CharacterLiteralNode)) {
      return false;
    }
    // super method compares values
    return super.equals(obj);
  }

  @Override
  public Collection<Node> getOperands() {
    return Collections.emptyList();
  }
}