/*

 * 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.  Sun designates this

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

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package javax.management;

/**

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

 * disjunctions of relational expressions.

 * @serial include

 *

 * @since 1.5

 */

class OrQueryExp extends QueryEval implements QueryExp {

    /* Serial version */

    private static final long serialVersionUID = 2962973084421716523L;

    /**

     * @serial The left query expression

     */

    private QueryExp exp1;

    /**

     * @serial The right query expression

     */

    private QueryExp exp2;

    /**

     * Basic Constructor.

     */

    public OrQueryExp() {

    }

    /**

     * Creates a new OrQueryExp with the specified ValueExps

     */

    public OrQueryExp(QueryExp q1, QueryExp q2) {

        exp1 = q1;

        exp2 = q2;

    }

    /**

     * Returns the left query expression.

     */

    public QueryExp getLeftExp() {

        return exp1;

    }

    /**

     * Returns the right query expression.

     */

    public QueryExp getRightExp() {

        return exp2;

    }

    /**

     * Applies the OrQueryExp on a MBean.

     *

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

     *

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

     *

     *

     * @exception BadStringOperationException The string passed to the method is invalid.

     * @exception BadBinaryOpValueExpException The expression passed to the method is invalid.

     * @exception BadAttributeValueExpException The attribute value passed to the method is invalid.

     */

    public boolean apply(ObjectName name) throws BadStringOperationException,

        BadBinaryOpValueExpException, BadAttributeValueExpException,

        InvalidApplicationException {

        return exp1.apply(name) || exp2.apply(name);

    }

    /**

     * Returns a string representation of this OrQueryExp

     */

    @Override

    public String toString() {

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

    }

    @Override

    String toQueryString() {

        return parens(exp1) + " or " + parens(exp2);

    }

    // Add parentheses to avoid possible confusion.  If we have an expression

    // such as Query.or(Query.and(a, b), c), then we return

    // (a and b) or c

    // rather than just

    // a and b or c

    // In fact the precedence rules are such that the parentheses are not

    // strictly necessary, but omitting them would be confusing.

    private static String parens(QueryExp exp) {

        String s = Query.toString(exp);

        if (exp instanceof AndQueryExp)

            return "(" + s + ")";

        else

            return s;

    }

}