com.caucho.amber.expr
Class ExistsExpr

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

public class ExistsExpr
extends AbstractAmberExpr

Represents an exists query expression


Field Summary
 
Fields inherited from interface com.caucho.amber.expr.AmberExpr
IS_INNER_JOIN, USES_DATA
 
Constructor Summary
ExistsExpr(AmberSelectQuery query)
           
 
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 for a boolean expression.
 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, replaceJoin, setInternalArgType, usesFrom
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ExistsExpr

public ExistsExpr(AmberSelectQuery query)
Method Detail

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

isBoolean

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

Specified by:
isBoolean in interface AmberExpr
Overrides:
isBoolean 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

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