/*
    * SPDX-FileCopyrightText: none
    * SPDX-License-Identifier: CC0-1.0
    */
   
   package dev.metaschema.core.metapath.cst;
   
   import java.util.List;
   
  import dev.metaschema.core.metapath.DynamicContext;
  import dev.metaschema.core.metapath.IExpression;
  import dev.metaschema.core.metapath.item.ISequence;
  import dev.metaschema.core.qname.IEnhancedQName;
  import dev.metaschema.core.util.CollectionUtil;
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  /**
   * The CST node for a Metapath
   * <a href="https://www.w3.org/TR/xpath-31/#id-variables">variable
   * reference</a>.
   */
  public class VariableReference
      extends AbstractExpression {
    @NonNull
    private final IEnhancedQName name;
  
    /**
     * Construct a new Metapath variable reference CST node.
     *
     * @param text
     *          the parsed text of the expression
     * @param name
     *          the variable name
     */
    public VariableReference(
        @NonNull String text,
        @NonNull IEnhancedQName name) {
      super(text);
      this.name = name;
    }
  
    /**
     * Get the variable name.
     *
     * @return the variable name
     */
    @NonNull
    public IEnhancedQName getName() {
      return name;
    }
  
    @Override
    public List<? extends IExpression> getChildren() {
      return CollectionUtil.emptyList();
    }
  
    @SuppressWarnings("null")
    @Override
    public String toCSTString() {
      return String.format("%s[name=%s]", getClass().getName(), getName());
    }
  
    @Override
    public <RESULT, CONTEXT> RESULT accept(IExpressionVisitor<RESULT, CONTEXT> visitor, CONTEXT context) {
      return visitor.visitVariableReference(this, context);
    }
  
    @Override
    protected ISequence<?> evaluate(DynamicContext dynamicContext, ISequence<?> focus) {
      return dynamicContext.getVariableValue(getName());
    }
  }