com.caucho.el
Class ConditionalNullExpr

java.lang.Object
  extended by javax.el.Expression
      extended by javax.el.ValueExpression
          extended by com.caucho.el.Expr
              extended by com.caucho.el.ConditionalNullExpr
All Implemented Interfaces:
java.io.Serializable

public class ConditionalNullExpr
extends Expr

Represents a conditional expression

See Also:
Serialized Form

Field Summary
 
Fields inherited from class com.caucho.el.Expr
L, log
 
Constructor Summary
ConditionalNullExpr(Expr value, Expr defaultExpr)
          Creates the conditional expression.
 
Method Summary
 boolean equals(java.lang.Object o)
          Returns true for equal strings.
 java.lang.Object getValue(ELContext env)
          Evaluate the expression as an object.
 boolean isConstant()
          Returns true if this is a constant expression.
 void printCreate(WriteStream os)
          Prints the Java code to recreate the expr
 java.lang.String toString()
          Returns a readable representation of the expr.
 
Methods inherited from class com.caucho.el.Expr
coerceToType, createField, createField, createMethod, error, evalBigDecimal, evalBigInteger, evalBoolean, evalCharacter, evalDouble, evalLong, evalObject, evalPeriod, evalString, evalStringWithNull, getExpectedType, getExpressionString, getMethodInfo, getType, hashCode, invocationError, invoke, isDouble, isDoubleString, isLiteralText, isReadOnly, print, print, printEscaped, printEscapedString, setProperty, setValue, toBigDecimal, toBigInteger, toBoolean, toCharacter, toDouble, toEnum, toLong, toStream, toStream, toStream, toStreamEscaped, toStreamEscaped, toStreamEscaped, toString, toString, toString, toString, toString, toStringWithNull
 
Methods inherited from class javax.el.ValueExpression
getValueReference
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

ConditionalNullExpr

public ConditionalNullExpr(Expr value,
                           Expr defaultExpr)
Creates the conditional expression.

Parameters:
test - the conditional expressions test.
trueExpr - the true subexpression
falseExpr - the false subexpression
Method Detail

isConstant

public boolean isConstant()
Returns true if this is a constant expression.

Overrides:
isConstant in class Expr

getValue

public java.lang.Object getValue(ELContext env)
                          throws ELException
Evaluate the expression as an object.

Specified by:
getValue in class Expr
Parameters:
env - the variable environment
Returns:
the result as an object
Throws:
ELException

printCreate

public void printCreate(WriteStream os)
                 throws java.io.IOException
Prints the Java code to recreate the expr

Overrides:
printCreate in class Expr
Parameters:
os - the output stream to the *.java file
Throws:
java.io.IOException

equals

public boolean equals(java.lang.Object o)
Returns true for equal strings.

Overrides:
equals in class Expr

toString

public java.lang.String toString()
Returns a readable representation of the expr.

Specified by:
toString in class Expr