package org.nfunk.jep.function;

import java.util.Stack;
import org.nfunk.jep.ParseException;
import org.nfunk.jep.type.Complex;

public class ArcCosineH extends PostfixMathCommand {
  public void run(Stack paramStack) throws ParseException {
    checkStack(paramStack);
    Object object = paramStack.pop();
    paramStack.push(acosh(object));
  }
  
  public Object acosh(Object paramObject) throws ParseException {
    if (paramObject instanceof Complex)
      return ((Complex)paramObject).acosh(); 
    if (paramObject instanceof Number) {
      double d = ((Number)paramObject).doubleValue();
      if (d >= 1.0D) {
        double d1 = Math.log(d + Math.sqrt(d * d - 1.0D));
        return new Double(d1);
      } 
      Complex complex = new Complex(((Number)paramObject).doubleValue(), 0.0D);
      return complex.acosh();
    } 
    throw new ParseException("Invalid parameter type");
  }
}