org.esa.beam.framework.dataop.barithm
Class SingleFlagSymbol

java.lang.Object
  org.esa.beam.framework.dataop.barithm.RasterDataSymbol
      org.esa.beam.framework.dataop.barithm.SingleFlagSymbol

All Implemented Interfaces:

Symbol

public final class SingleFlagSymbol
extends RasterDataSymbol

Represents a read-only symbol. A symbol can be a named constant or variable. It has a return type an can be evaluated. This class represents a specific implementation for flag expressions.

Within an expression, a reference to a symbol is created if the parser encounters a name and this name can be resolved through the parser's current namespace. The resulting term in this case is an instance of Term.Ref.

Version:

$Revision$ $Date$

Author:

Norman Fomferra (norman.fomferra@brockmann-consult.de)

Nested Class Summary

Nested classes/interfaces inherited from class org.esa.beam.framework.dataop.barithm.RasterDataSymbol

RasterDataSymbol.Source

Field Summary

Fields inherited from class org.esa.beam.framework.dataop.barithm.RasterDataSymbol

data, GEOPHYSICAL, RAW

Constructor Summary

SingleFlagSymbol(String symbolName, RasterDataNode raster, int flagMask)

Method Summary

boolean	evalB(EvalEnv env) Evaluates this symbol to a boolean value.
double	evalD(EvalEnv env) Evaluates this symbol to a double value.
int	evalI(EvalEnv env) Evaluates this symbol to an int value.
int	getFlagMask() Returns the flag mask used by this symbol.
int	getRetType() Gets the symbol's return type.

Methods inherited from class org.esa.beam.framework.dataop.barithm.RasterDataSymbol

evalS, getName, getRaster, getSource, setData

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SingleFlagSymbol

public SingleFlagSymbol(String symbolName,
                        RasterDataNode raster,
                        int flagMask)

Method Detail

getRetType

public final int getRetType()

Description copied from interface: Symbol

Gets the symbol's return type.

Specified by:

getRetType in interface Symbol

Overrides:

getRetType in class RasterDataSymbol

Returns:

the type, should always be one of the TYPE_X constants defined in the Term class.

getFlagMask

public final int getFlagMask()

Returns the flag mask used by this symbol.

Returns:

the flag mask.

evalB

public final boolean evalB(EvalEnv env)
                    throws EvalException

Description copied from interface: Symbol

Evaluates this symbol to a boolean value.

Specified by:

evalB in interface Symbol

Overrides:

evalB in class RasterDataSymbol

Parameters:

env - the application dependant environment.

Returns:

a boolean value

Throws:

EvalException - if the evaluation fails

evalI

public final int evalI(EvalEnv env)
                throws EvalException

Description copied from interface: Symbol

Evaluates this symbol to an int value.

Specified by:

evalI in interface Symbol

Overrides:

evalI in class RasterDataSymbol

Parameters:

env - the application dependant environment.

Returns:

an int value

Throws:

EvalException - if the evaluation fails

evalD

public final double evalD(EvalEnv env)
                   throws EvalException

Description copied from interface: Symbol

Evaluates this symbol to a double value.

Specified by:

evalD in interface Symbol

Overrides:

evalD in class RasterDataSymbol

Parameters:

env - the application dependant environment.

Returns:

a double value

Throws:

EvalException - if the evaluation fails