@Override
TemplateModel _eval(Environment env) throws TemplateException {
TemplateNumberModel targetModel = null;
TemplateModel tm = target.eval(env);
try {
targetModel = (TemplateNumberModel) tm;
} catch (ClassCastException cce) {
throw new NonNumericalException(target, tm, env);
}
if (!isMinus) {
return targetModel;
}
target.assertNonNull(targetModel, env);
Number n = targetModel.getAsNumber();
n = ArithmeticEngine.CONSERVATIVE_ENGINE.multiply(MINUS_ONE, n);
return new SimpleNumber(n);
}
static Number getNumber(TemplateNumberModel model, Expression expr, Environment env)
throws TemplateModelException, TemplateException {
Number value = model.getAsNumber();
if (value == null) {
throw new TemplateException(expr + " evaluated to null number.", env);
}
return value;
}
/**
* Override the <code>Object.equals</code> method.
*
* @param o the object we're comparing against
* @return <code>true</code> if the two objects are equal, otherwise <code>false</code>
*/
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof NumberLiteral)) {
return false;
}
final NumberLiteral numberLiteral = (NumberLiteral) o;
if (value == null) {
return numberLiteral.value == null;
} else {
return value.equals(numberLiteral.value);
}
}
/**
* Override the <code>Object.hashCode</code> method.
*
* @return a hash code corresponding to the value of this object
*/
public int hashCode() {
return value.hashCode() + 17;
}
/**
* Override the <code>Object.toString</code> method.
*
* @return a <code>String</code> representation of this expression
*/
public String toString() {
return value.toString();
}