Application: gvSIG desktop

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

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

import static org.gvsig.expressionevaluator.ExpressionBuilder.OPERATOR_EQ;

import org.gvsig.expressionevaluator.Function;

import org.gvsig.expressionevaluator.Interpreter;

public class EqOperator extends AbstractBinaryOperator {

    public EqOperator() {

        super(Function.GROUP_BOOLEAN, OPERATOR_EQ, true);

    }

    @Override

    public boolean allowConstantFolding() {

        return true;

    }

    @Override

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

        if( op1==op2 ) {

            return true;

        }

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

        if( (type & TYPE_NULL) == TYPE_NULL ) {

            return op1==op2;

        }

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

            double accuracy = MathUtils.EPSILON;

            if( interpreter.getAccuracy()!=null ) {

              accuracy = interpreter.getAccuracy();

            }

            boolean value = MathUtils.compareTo(getDouble(op1, 1),getDouble(op2, 2),accuracy) == 0;

            return value;

        }

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

            double accuracy = MathUtils.EPSILON;

            if( interpreter.getAccuracy()!=null ) {

              accuracy = interpreter.getAccuracy();

            }

            boolean value = MathUtils.compareTo(getFloat(op1, 1),getFloat(op2, 2),accuracy) == 0;

            return value;

        }

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

            boolean value = Long.compare(getLong(op1, 1),getLong(op2, 2)) == 0;

            return value;

        }

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

            boolean value = Integer.compare(getInt(op1, 1),getInt(op2, 2)) == 0;

            return value;

        }

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

            boolean value =   getComparable(op1,1).compareTo(getComparable(op2,2)) == 0;

            return value;

        }

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

    }

}