Method path

core/src/main/java/org/apache/calcite/schema/Schemas.java:560–585

Creates a path with a given list of names starting from a given root schema.

(CalciteSchema rootSchema, Iterable<String> names)

  /** Creates a path with a given list of names starting from a given root
   * schema. */
  public static Path path(CalciteSchema rootSchema, Iterable<String> names) {
    final ImmutableList.Builder<Pair<String, Schema>> builder =
        ImmutableList.builder();
    Schema schema = rootSchema.plus();
    final Iterator<String> iterator = names.iterator();
    if (!iterator.hasNext()) {
      return PathImpl.EMPTY;
    }
    if (!rootSchema.name.isEmpty()) {
      // If path starts with the name of the root schema, ignore the first step
      // in the path.
      checkState(rootSchema.name.equals(iterator.next()));
    }
    for (;;) {
      final String name = iterator.next();
      builder.add(Pair.of(name, schema));
      if (!iterator.hasNext()) {
        return path(builder.build());
      }
      Schema next = schema.subSchemas().get(name);
      if (next == null) {
        throw new IllegalArgumentException("schema " + name + " is not found in " + schema);
      }
      schema = next;
    }
  }

  public static Path path(Iterable<? extends Map.Entry<String, Schema>> list) {
    return new PathImpl(ImmutablePairList.copyOf(list));