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An implementation of the Canonical JSON format with support for javax.json and Jackson

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package io.setl.json.pointer;

import jakarta.json.JsonArray;
import jakarta.json.JsonValue;

import io.setl.json.exception.PointerIndexException;
import io.setl.json.pointer.JsonExtendedPointer.ResultOfAdd;

/**
 * Special handling for the '-' terminal.
 *
 * @author Simon Greatrix on 27/01/2020.
 */
class ExtraTerminal extends ObjectTerminal {

  ExtraTerminal(String path) {
    super(path, "-");
  }


  @Override
  public void add(JsonArray target, JsonValue value) {
    target.add(value);
  }


  private PointerIndexException bad(int size) {
    return new PointerIndexException("Array index not yet created.", path, size);
  }


  @Override
  public boolean contains(PathElement other) {
    if (other.isArrayType()) {
      // this is a wildcard match
      return true;
    }

    // keys must match
    return "-".equals(other.getKey());
  }


  @Override
  public boolean containsValue(JsonArray target) {
    return false;
  }


  @Override
  public void copy(JsonArray source, JsonArray target) {
    // works as a wildcard
    int s = source.size();
    while (target.size() < s) {
      target.add(null);
    }
    for (int i = 0; i < s; i++) {
      JsonValue value = source.get(i);
      target.set(i, value);
    }
  }


  @Override
  public int getIndex() {
    return -2;
  }


  @Override
  public JsonValue getValue(JsonArray target) {
    throw bad(target.size());
  }


  @Override
  public void remove(JsonArray target) {
    throw bad(target.size());
  }


  @Override
  public void replace(JsonArray target, JsonValue value) {
    throw bad(target.size());
  }


  @Override
  public ResultOfAdd testAdd(JsonArray target) {
    return ResultOfAdd.CREATE;
  }

}