Color fromColor = coverageRule.getFromColor();
Color toColor = coverageRule.getToColor();
double[] values = coverageRule.getFromToValues();
double opacity = coverageRule.getOpacity();
Expression fromColorExpr = sB.colorExpression(new java.awt.Color(fromColor.getRed(), fromColor.getGreen(),
fromColor.getBlue(), 255));
Expression toColorExpr = sB.colorExpression(new java.awt.Color(toColor.getRed(), toColor.getGreen(), toColor
.getBlue(), 255));
Expression fromExpr = sB.literalExpression(values[0]);
Expression toExpr = sB.literalExpression(values[1]);