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/*
 * Copyright 2019-2024 IDsec Solutions AB
 *
 * 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 se.idsec.signservice.integration.core;

import java.io.Serial;
import java.util.HashMap;
import java.util.Map;

/**
 * Represents an extension to a domain object. An extension is a set of name-value pairs.
 *
 * @author Martin Lindström ([email protected])
 * @author Stefan Santesson ([email protected])
 */
public class Extension extends HashMap {

  @Serial
  private static final long serialVersionUID = 3763640336680098817L;

  /**
   * Default constructor.
   */
  public Extension() {
    super();
  }

  /**
   * Copy constructor.
   *
   * @param m the map to initialize the object with
   */
  public Extension(final Map m) {
    super(m);
  }

  /**
   * Returns a builder for extension builder.
   *
   * @return a builder
   */
  public static ExtensionBuilder builder() {
    return new ExtensionBuilder();
  }

  /**
   * Builder for {@code Extension} objects.
   *
   * @author Martin Lindström ([email protected])
   * @author Stefan Santesson ([email protected])
   */
  public static class ExtensionBuilder implements ObjectBuilder {

    /** The object being built. */
    private final Extension extension;

    /**
     * Constructor.
     */
    ExtensionBuilder() {
      this.extension = new Extension();
    }

    /** {@inheritDoc} */
    @Override
    public Extension build() {
      return this.extension;
    }

    /**
     * Adds a name-value pair.
     *
     * @param name extension name
     * @param value extension value
     * @return the builder
     */
    ExtensionBuilder add(final String name, final String value) {
      this.extension.put(name, value);
      return this;
    }

  }

}