String str=edgeAction.trim().toUpperCase();
if("ZERO".equals(str)) this.edgeAction = ZERO_EDGES;
else if("CLAMP".equals(str)) this.edgeAction = CLAMP_EDGES;
else if("WRAP".equals(str)) this.edgeAction = WRAP_EDGES;
else
throw new ExpressionException("invalid value ["+edgeAction+"] for edgeAction, valid values are [clamp,wrap,zero]");
}