Application: gvSIG desktop

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

import org.apache.commons.lang3.ObjectUtils;

import org.apache.commons.math.util.MathUtils;

import org.gvsig.expressionevaluator.Function;

import org.gvsig.expressionevaluator.Interpreter;

public class IsOperator extends AbstractBinaryOperator {

    public static final String NAME = "IS";

    public IsOperator() {

        super(Function.GROUP_BOOLEAN, NAME);

    }

    @Override

    public boolean allowConstantFolding() {

        return true;

    }

    @Override

    public Object call(Interpreter interpreter, Object op1, Object op2) {

        // FIXME: https://stackoverflow.com/questions/9822154/standard-sql-boolean-operator-is-vs-equals-operator

        int type = this.getType(op1, op2);

        if( (type & TYPE_DOUBLE) == TYPE_DOUBLE ) {

            boolean value = MathUtils.compareTo(

                ((Number) op1).doubleValue(), 

                ((Number) op2).doubleValue(),

                interpreter.getAccuracy()==null? MathUtils.EPSILON:interpreter.getAccuracy()

            ) == 0;

            return value;

        }

        if( (type & TYPE_FLOAT) == TYPE_FLOAT ) {

            boolean value = MathUtils.compareTo(

                ((Number) op1).floatValue(), 

                ((Number) op2).floatValue(),

                interpreter.getAccuracy()==null? MathUtils.EPSILON:interpreter.getAccuracy()

            ) == 0;

            return value;

        }

        if( (type & TYPE_LONG) == TYPE_LONG ) {

            boolean value = ((Number) op1).longValue() == ((Number) op2).longValue();

            return value;

        }

        if( (type & TYPE_INT) == TYPE_INT ) {

            boolean value = ((Number) op1).intValue() == ((Number) op2).intValue();

            return value;

        }        

        if( op2 instanceof Comparable && op2 instanceof Comparable ) {

            boolean value = ObjectUtils.compare((Comparable)op1,(Comparable)op2) == 0;

            return value;

        }

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

    }

}