com.caucho.el
Class AbstractBooleanExpr

java.lang.Object
  javax.el.Expression
      javax.el.ValueExpression
          com.caucho.el.Expr
              com.caucho.el.AbstractBooleanExpr

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

BooleanExpr, BooleanLiteral, CmpExpr, EqExpr, GeExpr, GtExpr, LeExpr, LtExpr, MatchesExpr, NeExpr

public abstract class AbstractBooleanExpr
extends Expr

Base implementation for a boolean-valued expression.

See Also:

Serialized Form

Field Summary

Fields inherited from class com.caucho.el.Expr

L, log

Constructor Summary

AbstractBooleanExpr()

Method Summary

abstract boolean	evalBoolean(ELContext env) Evaluate the expression as a boolean
double	evalDouble(ELContext env) Evaluate the expression as a double
long	evalLong(ELContext env) Evaluate the expression as a long
java.lang.String	evalString(ELContext env) Evaluate the expression as a string
java.lang.Object	getValue(ELContext env) Evaluate the expression as an object.
boolean	print(WriteStream out, ELContext env, boolean isEscaped) Evalutes directly to the output.

Methods inherited from class com.caucho.el.Expr

coerceToType, createField, createField, createMethod, equals, error, evalBigDecimal, evalBigInteger, evalCharacter, evalObject, evalPeriod, evalStringWithNull, getExpectedType, getExpressionString, getMethodInfo, getType, hashCode, invocationError, invoke, isConstant, isDouble, isDoubleString, isLiteralText, isReadOnly, print, printCreate, printEscaped, printEscapedString, setProperty, setValue, toBigDecimal, toBigInteger, toBoolean, toCharacter, toDouble, toEnum, toLong, toStream, toStream, toStream, toStreamEscaped, toStreamEscaped, toStreamEscaped, toString, 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

AbstractBooleanExpr

public AbstractBooleanExpr()

Method Detail

evalBoolean

public abstract boolean evalBoolean(ELContext env)
                             throws ELException

Evaluate the expression as a boolean

Overrides:

evalBoolean in class Expr

Parameters:

env - the variable environment

Returns:

the value as a booleanstring

Throws:

ELException

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 value as an object

Throws:

ELException

evalString

public java.lang.String evalString(ELContext env)
                            throws ELException

Evaluate the expression as a string

Overrides:

evalString in class Expr

Parameters:

env - the variable environment

Returns:

the value as a string

Throws:

ELException

evalLong

public long evalLong(ELContext env)
              throws ELException

Evaluate the expression as a long

Overrides:

evalLong in class Expr

Parameters:

env - the variable environment

Returns:

the value as a long

Throws:

ELException

evalDouble

public double evalDouble(ELContext env)
                  throws ELException

Evaluate the expression as a double

Overrides:

evalDouble in class Expr

Parameters:

env - the variable environment

Returns:

the value of the expression as a double

Throws:

ELException

print

public boolean print(WriteStream out,
                     ELContext env,
                     boolean isEscaped)
              throws java.io.IOException,
                     ELException

Evalutes directly to the output.

Overrides:

print in class Expr

Parameters:

out - the output stream

env - the variable environment

isEscaped - if true, escape reserved XML

Returns:

true if the object is null, otherwise false

Throws:

java.io.IOException

ELException