In triangle $ABC$, angle $B$ is a right angle. Point $D$ lies on $\overline{AC}$ and point $E$ lies on $\overline{BC}$ such that $\overline{DE}$ is parallel to $\overline{AB}$. If the area of triangle $CDE$ is $\frac{1}{4}$ the area of triangle $CAB$, and the measure of angle $BCA$ is $30^{\circ }$, what is the measure, in degrees, of angle $ADE$?