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/*
 * Copyright 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package elemental.json.impl;

import elemental.json.JsonValue;

/**
 * Represents the current location where a value is stored, and allows
 * the value's replacement or deletion.
 */
abstract class JsonContext {

  private JsonValue value;

  private boolean isFirst = true;

  JsonContext(JsonValue value) {
    this.value = value;
  }

  /**
   * Return the underlying JsonValue (Array or Object) that backs the
   * context.
   */
  public JsonValue getValue() {
    return value;
  }

  /**
   * Whether or not the current context location within the value is the first
   * key or array index.
   */
  public boolean isFirst() {
    return isFirst;
  }

  /**
   * Remove the current array index or key from the underlying json.
   */
  public abstract void removeMe();

  /**
   * Replace the current location's value with a double.
   */
  public abstract void replaceMe(double d);

  /**
   * Replace the current location's value with a String.
   */
  public abstract void replaceMe(String d);

  /**
   * Replace the current location's value with a boolean.
   */
  public abstract void replaceMe(boolean d);

  /**
   * Replace the current location's value with a JsonValue.
   */
  public abstract void replaceMe(JsonValue value);

  public void setFirst(boolean first) {
    isFirst = first;
  }

  void setValue(JsonValue value) {
    this.value = value;
  }
}