Application: gvSIG desktop

package org.gvsig.expressionevaluator.impl.function.numeric;

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

public class BitAndFunction extends AbstractFunction {

    public BitAndFunction() {

        super("Numeric", "BITAND", Range.is(2),

            "The BITAND function treats its inputs and its output as vectors of bits; the output is the bitwise AND of the inputs.\n" +

            "\n" +

            "The types of expr1 and expr2 are INTEGER or LONG, and the result is of type INTEGER or LONG.\n" +

            "If the types of expr1 or expr2 are not INTEGER or LONG a error is raised.\n",

            "BITAND({{expr1}}, expr2)",

            new String[]{

                "expr1 - the fisrt argument",

                "expr2 - the second argument"

            },

            "Long",

            true

        );

    }

    @Override

    public boolean allowConstantFolding() {

        return true;

    }

    @Override

    public Object call(Interpreter interpreter, Object[] args) {

        Object op1 = args[0];

        Object op2 = args[1];

        if( op1 instanceof Integer ) {

            int value = ((Number) op1).intValue() & ((Number) op2).intValue();

            return value;

        } 

        if( op1 instanceof Number ) {

            long value = ((Number) op1).longValue() & ((Number) op2).longValue();

            return value;

        } 

        throw new IllegalArgumentException("Types not allowed in '"+name()+"' function.");

    }

}