/**
* @param r0
* @param r1
*/
public Project(Relation r0, Relation r1) {
super();
this.r0 = r0;
this.r1 = r1;
this.attributes = new LinkedList(r1.getAttributes());
this.attributes.removeAll(r0.getAttributes());
}
/*
* (non-Javadoc)
*
* @see net.sf.bddbddb.ir.Operation#getExpressionString()
*/
public String getExpressionString() {
return "project(" + r1.toString() + "," + attributes.toString() + ")";
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
public String toString() {
return r0.toString() + " = " + getExpressionString();
}