com.caucho.amber.expr
Class EmptyExpr

java.lang.Object
  extended by com.caucho.amber.expr.AbstractAmberExpr
      extended by com.caucho.amber.expr.EmptyExpr
All Implemented Interfaces:
AmberExpr

public class EmptyExpr
extends AbstractAmberExpr

Represents a member query expression


Field Summary
 
Fields inherited from interface com.caucho.amber.expr.AmberExpr
IS_INNER_JOIN, USES_DATA
 
Constructor Summary
EmptyExpr(AmberExpr collectionExpr)
           
 
Method Summary
 AmberExpr bindSelect(QueryParser parser)
          Binds the expression as a select item.
 void generateHaving(CharBuffer cb)
          Generates the having expression.
 void generateUpdateWhere(CharBuffer cb)
          Generates the (update) where expression.
 void generateWhere(CharBuffer cb)
          Generates the where expression.
 boolean isBoolean()
          Returns true as a boolean expression.
 AmberExpr replaceJoin(JoinExpr join)
          Returns true if the expression uses the from item.
 boolean usesFrom(FromItem from, int type, boolean isNot)
          Returns true if the expression uses the from item.
 
Methods inherited from class com.caucho.amber.expr.AbstractAmberExpr
createBoolean, exists, exists, findItem, generateJoin, generateSelect, getCacheObject, getColumnCount, getObject, getType, hasRelationship, setInternalArgType, usesFrom
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

EmptyExpr

public EmptyExpr(AmberExpr collectionExpr)
Method Detail

isBoolean

public boolean isBoolean()
Returns true as a boolean expression.

Specified by:
isBoolean in interface AmberExpr
Overrides:
isBoolean in class AbstractAmberExpr

bindSelect

public AmberExpr bindSelect(QueryParser parser)
Binds the expression as a select item.

Specified by:
bindSelect in interface AmberExpr
Specified by:
bindSelect in class AbstractAmberExpr

usesFrom

public boolean usesFrom(FromItem from,
                        int type,
                        boolean isNot)
Returns true if the expression uses the from item.

Specified by:
usesFrom in interface AmberExpr
Overrides:
usesFrom in class AbstractAmberExpr

replaceJoin

public AmberExpr replaceJoin(JoinExpr join)
Returns true if the expression uses the from item.

Specified by:
replaceJoin in interface AmberExpr
Overrides:
replaceJoin in class AbstractAmberExpr

generateWhere

public void generateWhere(CharBuffer cb)
Generates the where expression.

Specified by:
generateWhere in interface AmberExpr
Overrides:
generateWhere in class AbstractAmberExpr

generateUpdateWhere

public void generateUpdateWhere(CharBuffer cb)
Generates the (update) where expression.

Specified by:
generateUpdateWhere in interface AmberExpr
Overrides:
generateUpdateWhere in class AbstractAmberExpr

generateHaving

public void generateHaving(CharBuffer cb)
Generates the having expression.

Specified by:
generateHaving in interface AmberExpr
Overrides:
generateHaving in class AbstractAmberExpr