How to use

checkNumComponents

method

in

org.apache.xmlgraphics.java2d.color.CIELabColorSpace

/**
 * CIE Lab space constructor which allows to give an arbitrary white point.
 * @param whitePoint the white point in XYZ coordinates (valid values: 0.0f to 1.0f, although
 * values slightly larger than 1.0f are common)
 */
public CIELabColorSpace(float[] whitePoint) {
  super(ColorSpace.TYPE_Lab, 3);
  checkNumComponents(whitePoint, 3);
  this.wpX = whitePoint[0];
  this.wpY = whitePoint[1];
  this.wpZ = whitePoint[2];
}

/**
 * Converts normalized (0..1) color components to CIE L*a*b*'s native value range.
 * @param comps the normalized components.
 * @return the denormalized components
 */
public float[] toNativeComponents(float[] comps) {
  checkNumComponents(comps);
  float[] nativeComps = new float[comps.length];
  for (int i = 0, c = comps.length; i < c; i++) {
    nativeComps[i] = denormalize(comps[i], i);
  }
  return nativeComps;
}

private void checkNumComponents(float[] colorvalue) {
  checkNumComponents(colorvalue, getNumComponents());
}

checkNumComponents(colorvalue, 3);
float x = colorvalue[0];
float y = colorvalue[1];

/** {@inheritDoc} */
@Override
public float[] toCIEXYZ(float[] colorvalue) {
  checkNumComponents(colorvalue);
  //Scale to native value range
  float l = denormalize(colorvalue[0], 0);
  float a = denormalize(colorvalue[1], 1);
  float b = denormalize(colorvalue[2], 2);
  return toCIEXYZNative(l, a, b);
}