/* * 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;  /** * <p>Constructs query object constraints.</p> * * <p>The MBean Server can be queried for MBeans that meet a particular * condition, using its {@link MBeanServer#queryNames queryNames} or * {@link MBeanServer#queryMBeans queryMBeans} method.  The {@link QueryExp} * parameter to the method can be any implementation of the interface * {@code QueryExp}, but it is usually best to obtain the {@code QueryExp} * value by calling the static methods in this class.  This is particularly * true when querying a remote MBean Server: a custom implementation of the * {@code QueryExp} interface might not be present in the remote MBean Server, * but the methods in this class return only standard classes that are * part of the JMX implementation.</p> * * <p>As an example, suppose you wanted to find all MBeans where the {@code * Enabled} attribute is {@code true} and the {@code Owner} attribute is {@code * "Duke"}. Here is how you could construct the appropriate {@code QueryExp} by * chaining together method calls:</p> * * <pre> * QueryExp query = *     Query.and(Query.eq(Query.attr("Enabled"), Query.value(true)), *               Query.eq(Query.attr("Owner"), Query.value("Duke"))); * </pre> * * @since 1.5 */ public class Query extends Object   {       /**      * A code representing the {@link Query#gt} query.  This is chiefly      * of interest for the serialized form of queries.      */     public static final int GT  = 0;      /**      * A code representing the {@link Query#lt} query.  This is chiefly      * of interest for the serialized form of queries.      */     public static final int LT  = 1;      /**      * A code representing the {@link Query#geq} query.  This is chiefly      * of interest for the serialized form of queries.      */     public static final int GE  = 2;      /**      * A code representing the {@link Query#leq} query.  This is chiefly      * of interest for the serialized form of queries.      */     public static final int LE  = 3;      /**      * A code representing the {@link Query#eq} query.  This is chiefly      * of interest for the serialized form of queries.      */     public static final int EQ  = 4;       /**      * A code representing the {@link Query#plus} expression.  This      * is chiefly of interest for the serialized form of queries.      */     public static final int PLUS  = 0;      /**      * A code representing the {@link Query#minus} expression.  This      * is chiefly of interest for the serialized form of queries.      */     public static final int MINUS = 1;      /**      * A code representing the {@link Query#times} expression.  This      * is chiefly of interest for the serialized form of queries.      */     public static final int TIMES = 2;      /**      * A code representing the {@link Query#div} expression.  This is      * chiefly of interest for the serialized form of queries.      */     public static final int DIV   = 3;       /**      * Basic constructor.      */     public Query() {     }       /**      * Returns a query expression that is the conjunction of two other query      * expressions.      *      * @param q1 A query expression.      * @param q2 Another query expression.      *      * @return  The conjunction of the two arguments.  The returned object      * will be serialized as an instance of the non-public class {@link      * <a href="../../serialized-form.html#javax.management.AndQueryExp">      * javax.management.AndQueryExp</a>}.      */     public static QueryExp and(QueryExp q1, QueryExp q2)  {         return new AndQueryExp(q1, q2);     }      /**      * Returns a query expression that is the disjunction of two other query      * expressions.      *      * @param q1 A query expression.      * @param q2 Another query expression.      *      * @return  The disjunction of the two arguments.  The returned object      * will be serialized as an instance of the non-public class {@link      * <a href="../../serialized-form.html#javax.management.OrQueryExp">      * javax.management.OrQueryExp</a>}.      */     public static QueryExp or(QueryExp q1, QueryExp q2)  {         return new OrQueryExp(q1, q2);     }      /**      * Returns a query expression that represents a "greater than" constraint on      * two values.      *      * @param v1 A value expression.      * @param v2 Another value expression.      *      * @return A "greater than" constraint on the arguments.  The      * returned object will be serialized as an instance of the      * non-public class {@link <a      * href="../../serialized-form.html#javax.management.BinaryRelQueryExp">      * javax.management.BinaryRelQueryExp</a>} with a {@code relOp} equal      * to {@link #GT}.      */     public static QueryExp gt(ValueExp v1, ValueExp v2)  {         return new BinaryRelQueryExp(GT, v1, v2);     }      /**      * Returns a query expression that represents a "greater than or equal      * to" constraint on two values.      *      * @param v1 A value expression.      * @param v2 Another value expression.      *      * @return A "greater than or equal to" constraint on the      * arguments.  The returned object will be serialized as an      * instance of the non-public class {@link <a      * href="../../serialized-form.html#javax.management.BinaryRelQueryExp">      * javax.management.BinaryRelQueryExp</a>} with a {@code relOp} equal      * to {@link #GE}.      */     public static QueryExp geq(ValueExp v1, ValueExp v2)  {         return new BinaryRelQueryExp(GE, v1, v2);     }      /**      * Returns a query expression that represents a "less than or equal to"      * constraint on two values.      *      * @param v1 A value expression.      * @param v2 Another value expression.      *      * @return A "less than or equal to" constraint on the arguments.      * The returned object will be serialized as an instance of the      * non-public class {@link <a      * href="../../serialized-form.html#javax.management.BinaryRelQueryExp">      * javax.management.BinaryRelQueryExp</a>} with a {@code relOp} equal      * to {@link #LE}.      */     public static QueryExp leq(ValueExp v1, ValueExp v2)  {         return new BinaryRelQueryExp(LE, v1, v2);     }      /**      * Returns a query expression that represents a "less than" constraint on      * two values.      *      * @param v1 A value expression.      * @param v2 Another value expression.      *      * @return A "less than" constraint on the arguments.  The      * returned object will be serialized as an instance of the      * non-public class {@link <a      * href="../../serialized-form.html#javax.management.BinaryRelQueryExp">      * javax.management.BinaryRelQueryExp</a>} with a {@code relOp} equal      * to {@link #LT}.      */     public static QueryExp lt(ValueExp v1, ValueExp v2)  {         return new BinaryRelQueryExp(LT, v1, v2);     }      /**      * Returns a query expression that represents an equality constraint on      * two values.      *      * @param v1 A value expression.      * @param v2 Another value expression.      *      * @return A "equal to" constraint on the arguments.  The      * returned object will be serialized as an instance of the      * non-public class {@link <a      * href="../../serialized-form.html#javax.management.BinaryRelQueryExp">      * javax.management.BinaryRelQueryExp</a>} with a {@code relOp} equal      * to {@link #EQ}.      */     public static QueryExp eq(ValueExp v1, ValueExp v2)  {         return new BinaryRelQueryExp(EQ, v1, v2);     }      /**      * Returns a query expression that represents the constraint that one      * value is between two other values.      *      * @param v1 A value expression that is "between" v2 and v3.      * @param v2 Value expression that represents a boundary of the constraint.      * @param v3 Value expression that represents a boundary of the constraint.      *      * @return The constraint that v1 lies between v2 and v3.  The      * returned object will be serialized as an instance of the      * non-public class {@link <a      * href="../../serialized-form.html#javax.management.BetweenQueryExp">      * javax.management.BetweenQueryExp</a>}.      */     public static QueryExp between(ValueExp v1, ValueExp v2, ValueExp v3) {         return new BetweenQueryExp(v1, v2, v3);     }      /**      * Returns a query expression that represents a matching constraint on      * a string argument. The matching syntax is consistent with file globbing:      * supports "<code>?</code>", "<code>*</code>", "<code>[</code>",      * each of which may be escaped with "<code>\</code>";      * character classes may use "<code>!</code>" for negation and      * "<code>-</code>" for range.      * (<code>*</code> for any character sequence,      * <code>?</code> for a single arbitrary character,      * <code>[...]</code> for a character sequence).      * For example: <code>a*b?c</code> would match a string starting      * with the character <code>a</code>, followed      * by any number of characters, followed by a <code>b</code>,      * any single character, and a <code>c</code>.      *      * @param a An attribute expression      * @param s A string value expression representing a matching constraint      *      * @return A query expression that represents the matching      * constraint on the string argument.  The returned object will      * be serialized as an instance of the non-public class {@link <a      * href="../../serialized-form.html#javax.management.MatchQueryExp">      * javax.management.MatchQueryExp</a>}.      */     public static QueryExp match(AttributeValueExp a, StringValueExp s)  {         return new MatchQueryExp(a, s);     }      /**      * <p>Returns a new attribute expression.  See {@link AttributeValueExp}      * for a detailed description of the semantics of the expression.</p>      *      * <p>Evaluating this expression for a given      * <code>objectName</code> includes performing {@link      * MBeanServer#getAttribute MBeanServer.getAttribute(objectName,      * name)}.</p>      *      * @param name The name of the attribute.      *      * @return An attribute expression for the attribute named {@code name}.      */     public static AttributeValueExp attr(String name)  {         return new AttributeValueExp(name);     }      /**      * <p>Returns a new qualified attribute expression.</p>      *      * <p>Evaluating this expression for a given      * <code>objectName</code> includes performing {@link      * MBeanServer#getObjectInstance      * MBeanServer.getObjectInstance(objectName)} and {@link      * MBeanServer#getAttribute MBeanServer.getAttribute(objectName,      * name)}.</p>      *      * @param className The name of the class possessing the attribute.      * @param name The name of the attribute.      *      * @return An attribute expression for the attribute named name.      * The returned object will be serialized as an instance of the      * non-public class {@link <a      * href="../../serialized-form.html#javax.management.QualifiedAttributeValueExp">      * javax.management.QualifiedAttributeValueExp</a>}.      */     public static AttributeValueExp attr(String className, String name)  {         return new QualifiedAttributeValueExp(className, name);     }      /**      * <p>Returns a new class attribute expression which can be used in any      * Query call that expects a ValueExp.</p>      *      * <p>Evaluating this expression for a given      * <code>objectName</code> includes performing {@link      * MBeanServer#getObjectInstance      * MBeanServer.getObjectInstance(objectName)}.</p>      *      * @return A class attribute expression.  The returned object      * will be serialized as an instance of the non-public class      * {@link <a      * href="../../serialized-form.html#javax.management.ClassAttributeValueExp">      * javax.management.ClassAttributeValueExp</a>}.      */     public static AttributeValueExp classattr()  {         return new ClassAttributeValueExp();     }      /**      * Returns a constraint that is the negation of its argument.      *      * @param queryExp The constraint to negate.      *      * @return A negated constraint.  The returned object will be      * serialized as an instance of the non-public class {@link <a      * href="../../serialized-form.html#javax.management.NotQueryExp">      * javax.management.NotQueryExp</a>}.      */     public static QueryExp not(QueryExp queryExp)  {         return new NotQueryExp(queryExp);     }      /**      * Returns an expression constraining a value to be one of an explicit list.      *      * @param val A value to be constrained.      * @param valueList An array of ValueExps.      *      * @return A QueryExp that represents the constraint.  The      * returned object will be serialized as an instance of the      * non-public class {@link <a      * href="../../serialized-form.html#javax.management.InQueryExp">      * javax.management.InQueryExp</a>}.      */     public static QueryExp in(ValueExp val, ValueExp valueList[])  {         return new InQueryExp(val, valueList);     }      /**      * Returns a new string expression.      *      * @param val The string value.      *      * @return  A ValueExp object containing the string argument.      */     public static StringValueExp value(String val)  {         return new StringValueExp(val);     }      /**      * Returns a numeric value expression that can be used in any Query call      * that expects a ValueExp.      *      * @param val An instance of Number.      *      * @return A ValueExp object containing the argument.  The      * returned object will be serialized as an instance of the      * non-public class {@link <a      * href="../../serialized-form.html#javax.management.NumericValueExp">      * javax.management.NumericValueExp</a>}.      */     public static ValueExp value(Number val)  {         return new NumericValueExp(val);     }      /**      * Returns a numeric value expression that can be used in any Query call      * that expects a ValueExp.      *      * @param val An int value.      *      * @return A ValueExp object containing the argument.  The      * returned object will be serialized as an instance of the      * non-public class {@link <a      * href="../../serialized-form.html#javax.management.NumericValueExp">      * javax.management.NumericValueExp</a>}.      */     public static ValueExp value(int val)  {         return new NumericValueExp((long) val);     }      /**      * Returns a numeric value expression that can be used in any Query call      * that expects a ValueExp.      *      * @param val A long value.      *      * @return A ValueExp object containing the argument.  The      * returned object will be serialized as an instance of the      * non-public class {@link <a      * href="../../serialized-form.html#javax.management.NumericValueExp">      * javax.management.NumericValueExp</a>}.      */     public static ValueExp value(long val)  {         return new NumericValueExp(val);     }      /**      * Returns a numeric value expression that can be used in any Query call      * that expects a ValueExp.      *      * @param val A float value.      *      * @return A ValueExp object containing the argument.  The      * returned object will be serialized as an instance of the      * non-public class {@link <a      * href="../../serialized-form.html#javax.management.NumericValueExp">      * javax.management.NumericValueExp</a>}.      */     public static ValueExp value(float val)  {         return new NumericValueExp((double) val);     }      /**      * Returns a numeric value expression that can be used in any Query call      * that expects a ValueExp.      *      * @param val A double value.      *      * @return  A ValueExp object containing the argument.  The      * returned object will be serialized as an instance of the      * non-public class {@link <a      * href="../../serialized-form.html#javax.management.NumericValueExp">      * javax.management.NumericValueExp</a>}.      */     public static ValueExp value(double val)  {         return new NumericValueExp(val);     }      /**      * Returns a boolean value expression that can be used in any Query call      * that expects a ValueExp.      *      * @param val A boolean value.      *      * @return A ValueExp object containing the argument.  The      * returned object will be serialized as an instance of the      * non-public class {@link <a      * href="../../serialized-form.html#javax.management.BooleanValueExp">      * javax.management.BooleanValueExp</a>}.      */     public static ValueExp value(boolean val)  {         return new BooleanValueExp(val);     }      /**      * Returns a binary expression representing the sum of two numeric values,      * or the concatenation of two string values.      *      * @param value1 The first '+' operand.      * @param value2 The second '+' operand.      *      * @return A ValueExp representing the sum or concatenation of      * the two arguments.  The returned object will be serialized as      * an instance of the non-public class {@link <a      * href="../../serialized-form.html#javax.management.BinaryOpValueExp">      * javax.management.BinaryOpValueExp</a>} with an {@code op} equal to      * {@link #PLUS}.      */     public static ValueExp plus(ValueExp value1, ValueExp value2) {

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