ScalarPreference.java

package org.hyperonline.hyperlib.pref;

import org.opencv.core.Scalar;

import java.util.ArrayList;
import java.util.List;
import java.util.function.Supplier;

/**
 * {@link ScalarPreference}
 *
 * @author James
 */
public class ScalarPreference implements Supplier<Scalar> {

  private List<DoublePreference> m_prefs = new ArrayList<>();

  /**
   * Construct a scalar preference with the given name and components.
   *
   * @param name The name of the preferences object.
   * @param components A sequence of letters indicating the components. For example, "RGB", "HSV",
   *     "XYZ", etc. It may be any length.
   * @param defaults Default settings for components
   */
  public ScalarPreference(String name, String components, double... defaults) {
    if (defaults.length != components.length()) {
      throw new IllegalArgumentException("Components and defaults have different lengths");
    }

    for (int i = 0; i < defaults.length; i++) {
      String childName = name + PreferencesSet.SEPARATOR + components.charAt(i);
      m_prefs.add(new DoublePreference(childName, defaults[i]));
    }
  }

  /** Construct a scalar preference, while also updating the right info inside the parent set. */
  ScalarPreference(PreferencesSet parent, String name, String components, double[] defaults) {
    if (defaults.length != components.length()) {
      throw new IllegalArgumentException("Components and defaults have different lengths");
    }

    for (int i = 0; i < defaults.length; i++) {
      String childName = name + PreferencesSet.SEPARATOR + components.charAt(i);
      m_prefs.add(parent.addDouble(childName, defaults[i]));
    }
  }

  /**
   * Get the current value of the preference.
   *
   * @return The current value of the preference.
   */
  @Override
  public Scalar get() {
    return new Scalar(m_prefs.stream().mapToDouble(DoublePreference::get).toArray());
  }
}