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There is a newer version: 2.4.0

package org.bukkit.configuration;

import org.apache.commons.lang.Validate;

import java.util.Map;

/**
 * This is a {@link Configuration} implementation that does not save or load
 * from any source, and stores all values in memory only.
 * This is useful for temporary Configurations for providing defaults.
 */
public class MemoryConfiguration extends MemorySection implements Configuration {
  protected Configuration defaults;
  protected MemoryConfigurationOptions options;

  /**
   * Creates an empty {@link MemoryConfiguration} with no default values.
   */
  public MemoryConfiguration() {
  }

  /**
   * Creates an empty {@link MemoryConfiguration} using the specified {@link
   * Configuration} as a source for all default values.
   *
   * @param defaults Default value provider
   * @throws IllegalArgumentException Thrown if defaults is null
   */
  public MemoryConfiguration(Configuration defaults) {
    this.defaults = defaults;
  }

  @Override
  public void addDefault(String path, Object value) {
    Validate.notNull(path, "Path may not be null");

    if (defaults == null) {
      defaults = new MemoryConfiguration();
    }

    defaults.set(path, value);
  }

  public void addDefaults(Map defaults) {
    Validate.notNull(defaults, "Defaults may not be null");

    for (Map.Entry entry : defaults.entrySet()) {
      addDefault(entry.getKey(), entry.getValue());
    }
  }

  public void addDefaults(Configuration defaults) {
    Validate.notNull(defaults, "Defaults may not be null");

    addDefaults(defaults.getValues(true));
  }

  public Configuration getDefaults() {
    return defaults;
  }

  public void setDefaults(Configuration defaults) {
    Validate.notNull(defaults, "Defaults may not be null");

    this.defaults = defaults;
  }

  @Override
  public ConfigurationSection getParent() {
    return null;
  }

  public MemoryConfigurationOptions options() {
    if (options == null) {
      options = new MemoryConfigurationOptions(this);
    }

    return options;
  }
}