/*

 * Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package javax.management;

/**

 * This class is used by the query-building mechanism to represent binary

 * operations.

 * @serial include

 *

 * @since 1.5

 */

class BinaryRelQueryExp extends QueryEval implements QueryExp {

    /* Serial version */

    private static final long serialVersionUID = -5690656271650491000L;

    /**

     * @serial The operator

     */

    private int relOp;

    /**

     * @serial The first value

     */

    private ValueExp exp1;

    /**

     * @serial The second value

     */

    private ValueExp exp2;

    /**

     * Basic Constructor.

     */

    public BinaryRelQueryExp() {

    }

    /**

     * Creates a new BinaryRelQueryExp with operator op applied on v1 and

     * v2 values.

     */

    public BinaryRelQueryExp(int op, ValueExp v1, ValueExp v2) {

        relOp = op;

        exp1  = v1;

        exp2  = v2;

    }

    /**

     * Returns the operator of the query.

     */

    public int getOperator()  {

        return relOp;

    }

    /**

     * Returns the left value of the query.

     */

    public ValueExp getLeftValue()  {

        return exp1;

    }

    /**

     * Returns the right value of the query.

     */

    public ValueExp getRightValue()  {

        return exp2;

    }

    /**

     * Applies the BinaryRelQueryExp on an MBean.

     *

     * @param name The name of the MBean on which the BinaryRelQueryExp will be applied.

     *

     * @return  True if the query was successfully applied to the MBean, false otherwise.

     *

     * @exception BadStringOperationException

     * @exception BadBinaryOpValueExpException

     * @exception BadAttributeValueExpException

     * @exception InvalidApplicationException

     */

    public boolean apply(ObjectName name) throws BadStringOperationException, BadBinaryOpValueExpException,

        BadAttributeValueExpException, InvalidApplicationException  {

        Object val1 = exp1.apply(name);

        Object val2 = exp2.apply(name);

        boolean numeric = val1 instanceof NumericValueExp;

        boolean bool = val1 instanceof BooleanValueExp;

        if (numeric) {

            if (((NumericValueExp)val1).isLong()) {

                long lval1 = ((NumericValueExp)val1).longValue();

                long lval2 = ((NumericValueExp)val2).longValue();

                switch (relOp) {

                case Query.GT:

                    return lval1 > lval2;

                case Query.LT:

                    return lval1 < lval2;

                case Query.GE:

                    return lval1 >= lval2;

                case Query.LE:

                    return lval1 <= lval2;

                case Query.EQ:

                    return lval1 == lval2;

                }

            } else {

                double dval1 = ((NumericValueExp)val1).doubleValue();

                double dval2 = ((NumericValueExp)val2).doubleValue();

                switch (relOp) {

                case Query.GT:

                    return dval1 > dval2;

                case Query.LT:

                    return dval1 < dval2;

                case Query.GE:

                    return dval1 >= dval2;

                case Query.LE:

                    return dval1 <= dval2;

                case Query.EQ:

                    return dval1 == dval2;

                }

            }

        } else if (bool) {

            boolean bval1 = ((BooleanValueExp)val1).getValue().booleanValue();

            boolean bval2 = ((BooleanValueExp)val2).getValue().booleanValue();

            switch (relOp) {

            case Query.GT:

                return bval1 && !bval2;

            case Query.LT:

                return !bval1 && bval2;

            case Query.GE:

                return bval1 || !bval2;

            case Query.LE:

                return !bval1 || bval2;

            case Query.EQ:

                return bval1 == bval2;

            }

        } else {

            String sval1 = ((StringValueExp)val1).getValue();

            String sval2 = ((StringValueExp)val2).getValue();

            switch (relOp) {

            case Query.GT:

                return sval1.compareTo(sval2) > 0;

            case Query.LT:

                return sval1.compareTo(sval2) < 0;

            case Query.GE:

                return sval1.compareTo(sval2) >= 0;

            case Query.LE:

                return sval1.compareTo(sval2) <= 0;

            case Query.EQ:

                return sval1.compareTo(sval2) == 0;

            }

        }

        return false;

    }

    /**

     * Returns the string representing the object.

     */

    @Override

    public String toString()  {

        return "(" + exp1 + ") " + relOpString() + " (" + exp2 + ")";

    }

    private String relOpString() {

        switch (relOp) {

        case Query.GT:

            return ">";

        case Query.LT:

            return "<";

        case Query.GE:

            return ">=";

        case Query.LE:

            return "<=";

        case Query.EQ:

            return "=";

        }

        return "=";

    }

 }