org.apache.taglibs.standard.lang.jstl.UnaryMinusOperator Maven / Gradle / Ivy
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package org.apache.taglibs.standard.lang.jstl;
/**
*
* The implementation of the unary minus operator
*
* @author Nathan Abramson - Art Technology Group
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $
**/
public class UnaryMinusOperator
extends UnaryOperator
{
//-------------------------------------
// Singleton
//-------------------------------------
public static final UnaryMinusOperator SINGLETON =
new UnaryMinusOperator ();
//-------------------------------------
/**
*
* Constructor
**/
public UnaryMinusOperator ()
{
}
//-------------------------------------
// Expression methods
//-------------------------------------
/**
*
* Returns the symbol representing the operator
**/
public String getOperatorSymbol ()
{
return "-";
}
//-------------------------------------
/**
*
* Applies the operator to the given value
**/
public Object apply (Object pValue,
Object pContext,
Logger pLogger)
throws ELException
{
if (pValue == null) {
/*
if (pLogger.isLoggingWarning ()) {
pLogger.logWarning
(Constants.ARITH_OP_NULL,
getOperatorSymbol ());
}
*/
return PrimitiveObjects.getInteger (0);
}
else if (pValue instanceof String) {
if (Coercions.isFloatingPointString (pValue)) {
double dval =
((Number)
(Coercions.coerceToPrimitiveNumber
(pValue, Double.class, pLogger))).
doubleValue ();
return PrimitiveObjects.getDouble (-dval);
}
else {
long lval =
((Number)
(Coercions.coerceToPrimitiveNumber
(pValue, Long.class, pLogger))).
longValue ();
return PrimitiveObjects.getLong (-lval);
}
}
else if (pValue instanceof Byte) {
return PrimitiveObjects.getByte
((byte) -(((Byte) pValue).byteValue ()));
}
else if (pValue instanceof Short) {
return PrimitiveObjects.getShort
((short) -(((Short) pValue).shortValue ()));
}
else if (pValue instanceof Integer) {
return PrimitiveObjects.getInteger
((int) -(((Integer) pValue).intValue ()));
}
else if (pValue instanceof Long) {
return PrimitiveObjects.getLong
((long) -(((Long) pValue).longValue ()));
}
else if (pValue instanceof Float) {
return PrimitiveObjects.getFloat
((float) -(((Float) pValue).floatValue ()));
}
else if (pValue instanceof Double) {
return PrimitiveObjects.getDouble
((double) -(((Double) pValue).doubleValue ()));
}
else {
if (pLogger.isLoggingError ()) {
pLogger.logError
(Constants.UNARY_OP_BAD_TYPE,
getOperatorSymbol (),
pValue.getClass ().getName ());
}
return PrimitiveObjects.getInteger (0);
}
}
//-------------------------------------
}