package railo.runtime.sql.exp;
public abstract class ExpressionSupport implements Expression {
private int index;
private String alias;
private boolean directionBackward;
@Override
public void setIndex(int index) {
this.index=index;
}
@Override
public int getIndex() {
return index;
}
@Override
public String getAlias() {
if(alias==null) return "column_"+(getIndex()-1);
return alias;
}
@Override
public void setAlias(String alias) {
this.alias = alias;
}
@Override
public boolean hasAlias() {
return alias!=null;
}
@Override
public boolean hasIndex() {
return index!=0;
}
@Override
public void setDirectionBackward(boolean b) {
directionBackward=b;
}
/**
* @return the directionBackward
*/
public boolean isDirectionBackward() {
return directionBackward;
}
}