/**
* Instructs the <code>Project</code> that one <code>Builder</code> depends on the other. Both
* <code>Builder</code> instances must first be added to this <code>Project</code>.
*
* <p><code>builder1</code> depends on <code>builder2</code>.
*
* @param builder1 A <code>Builder</code>. This <code>Builder</code> depends on the other.
* @param builder2 A <code>Builder</code>.
*/
public void dependsOn(Builder builder1, Builder builder2) {
String head = Integer.toString(builder1.hashCode()),
tail = Integer.toString(builder2.hashCode());
if (!head.equals(tail)
&& dependencies.containsKey(head)
&& dependencies.containsKey(tail)
&& !dependencies.dependencyExists(head, tail)) {
dependencies.addDependency(head, tail);
}
}
