/*
    * SPDX-FileCopyrightText: none
    * SPDX-License-Identifier: CC0-1.0
    */
   
   package dev.metaschema.core.metapath.cst.items;
   
   import java.util.List;
   
  import dev.metaschema.core.metapath.DynamicContext;
  import dev.metaschema.core.metapath.IExpression;
  import dev.metaschema.core.metapath.cst.AbstractExpression;
  import dev.metaschema.core.metapath.cst.IExpressionVisitor;
  import dev.metaschema.core.metapath.item.ISequence;
  import dev.metaschema.core.metapath.item.function.IArrayItem;
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  /**
   * An implementation of the
   * <a href="https://www.w3.org/TR/xpath-31/#id-array-constructors">Array Square
   * Constructor</a> supporting the creation of a Metapath {@link IArrayItem}.
   */
  public class ArraySquareConstructor
      extends AbstractExpression {
    @NonNull
    private final List<IExpression> children;
  
    /**
     * Construct a new array constructor expression that uses the provided
     * expression to initialize the array.
     * <p>
     * Each resulting array member contains the value of the corresponding argument
     * expression.
     *
     * @param text
     *          the parsed text of the expression
     * @param children
     *          the expressions used to produce the array members
     */
    public ArraySquareConstructor(@NonNull String text, @NonNull List<IExpression> children) {
      super(text);
      this.children = children;
    }
  
    @Override
    public List<? extends IExpression> getChildren() {
      return children;
    }
  
    @Override
    protected ISequence<IArrayItem<?>> evaluate(DynamicContext dynamicContext, ISequence<?> focus) {
      return ISequence.of(getChildren().stream()
          .map(expr -> expr.accept(dynamicContext, focus))
          .map(ISequence::toCollectionValue)
          .collect(IArrayItem.toArrayItem()));
    }
  
    @Override
    public <RESULT, CONTEXT> RESULT accept(IExpressionVisitor<RESULT, CONTEXT> visitor, CONTEXT context) {
      return visitor.visitArray(this, context);
    }
  }