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Common functionality used by Annot8 implementations

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/* Annot8 (annot8.io) - Licensed under Apache-2.0. */
package io.annot8.common.implementations.properties;

import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Collectors;

import io.annot8.core.properties.MutableProperties;
import io.annot8.core.properties.Properties;

/**
 * Implementation of MutableProperties interface using an in-memory HashMap to store the properties.
 */
public class MapMutableProperties implements MutableProperties {

  private final Map properties = new HashMap<>();

  /** Create a new instance with no key-values */
  public MapMutableProperties() {
    // Do nothing
  }

  /** Create a new instance with key-values from an existing Properties object */
  public MapMutableProperties(Properties properties) {
    properties.getAll().forEach(this.properties::put);
  }

  /** Create a new instance with key-values from an existing Map */
  public MapMutableProperties(Map properties) {
    properties.forEach(this.properties::put);
  }

  @Override
  public Map getAll() {
    return properties;
  }

  @Override
  public void set(String key, Object value) {
    properties.put(key, value);
  }

  @Override
  public Optional