001 package railo.runtime.sql.exp; 002 003 public abstract class ExpressionSupport implements Expression { 004 005 private int index; 006 private String alias; 007 private boolean directionBackward; 008 009 010 @Override 011 public void setIndex(int index) { 012 this.index=index; 013 } 014 015 @Override 016 public int getIndex() { 017 return index; 018 } 019 020 @Override 021 public String getAlias() { 022 if(alias==null) return "column_"+(getIndex()-1); 023 return alias; 024 } 025 026 @Override 027 public void setAlias(String alias) { 028 this.alias = alias; 029 } 030 031 @Override 032 public boolean hasAlias() { 033 return alias!=null; 034 } 035 036 @Override 037 public boolean hasIndex() { 038 return index!=0; 039 } 040 041 @Override 042 public void setDirectionBackward(boolean b) { 043 directionBackward=b; 044 } 045 046 /** 047 * @return the directionBackward 048 */ 049 public boolean isDirectionBackward() { 050 return directionBackward; 051 } 052 }