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The Query.java Java example source code
/*
* Copyright (c) 1999, 2013, 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>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
* <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
* <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
* <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
* <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
* <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
* <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
* <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
* <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>?", "*", "[",
* each of which may be escaped with "<code>\";
* character classes may use "<code>!" for negation and
* "<code>-" for range.
* (<code>* for any character sequence,
* <code>? for a single arbitrary character,
* <code>[...] for a character sequence).
* For example: <code>a*b?c would match a string starting
* with the character <code>a, followed
* by any number of characters, followed by a <code>b,
* any single character, and a <code>c.
*
* @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
* <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 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>Evaluating this expression for a given
* <code>objectName 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
* <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 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
* <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
* <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
* <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
* <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
* <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
* <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
* <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
* <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
* <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
* <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) {
return new BinaryOpValueExp(PLUS, value1, value2);
}
/**
* Returns a binary expression representing the product of two numeric values.
*
*
* @param value1 The first '*' operand.
* @param value2 The second '*' operand.
*
* @return A ValueExp representing the product. The returned
* object will be serialized as an instance of the non-public
* class
* <a href="../../serialized-form.html#javax.management.BinaryOpValueExp">
* javax.management.BinaryOpValueExp</a> with an {@code op} equal to
* {@link #TIMES}.
*/
public static ValueExp times(ValueExp value1,ValueExp value2) {
return new BinaryOpValueExp(TIMES, value1, value2);
}
/**
* Returns a binary expression representing the difference between two numeric
* values.
*
* @param value1 The first '-' operand.
* @param value2 The second '-' operand.
*
* @return A ValueExp representing the difference between two
* arguments. The returned object will be serialized as an
* instance of the non-public class
* <a href="../../serialized-form.html#javax.management.BinaryOpValueExp">
* javax.management.BinaryOpValueExp</a> with an {@code op} equal to
* {@link #MINUS}.
*/
public static ValueExp minus(ValueExp value1, ValueExp value2) {
return new BinaryOpValueExp(MINUS, value1, value2);
}
/**
* Returns a binary expression representing the quotient of two numeric
* values.
*
* @param value1 The first '/' operand.
* @param value2 The second '/' operand.
*
* @return A ValueExp representing the quotient of two arguments.
* The returned object will be serialized as an instance of the
* non-public class
* <a href="../../serialized-form.html#javax.management.BinaryOpValueExp">
* javax.management.BinaryOpValueExp</a> with an {@code op} equal to
* {@link #DIV}.
*/
public static ValueExp div(ValueExp value1, ValueExp value2) {
return new BinaryOpValueExp(DIV, value1, value2);
}
/**
* Returns a query expression that represents a matching constraint on
* a string argument. The value must start with the given literal string
* value.
*
* @param a An attribute expression.
* @param s A string value expression representing the beginning of the
* string value.
*
* @return The constraint that a matches s. The returned object
* will be serialized as an instance of the non-public class
*
* <a href="../../serialized-form.html#javax.management.MatchQueryExp">
* javax.management.MatchQueryExp</a>.
*/
public static QueryExp initialSubString(AttributeValueExp a, StringValueExp s) {
return new MatchQueryExp(a,
new StringValueExp(escapeString(s.getValue()) + "*"));
}
/**
* Returns a query expression that represents a matching constraint on
* a string argument. The value must contain the given literal string
* value.
*
* @param a An attribute expression.
* @param s A string value expression representing the substring.
*
* @return The constraint that a matches s. The returned object
* will be serialized as an instance of the non-public class
*
* <a href="../../serialized-form.html#javax.management.MatchQueryExp">
* javax.management.MatchQueryExp</a>.
*/
public static QueryExp anySubString(AttributeValueExp a, StringValueExp s) {
return new MatchQueryExp(a,
new StringValueExp("*" + escapeString(s.getValue()) + "*"));
}
/**
* Returns a query expression that represents a matching constraint on
* a string argument. The value must end with the given literal string
* value.
*
* @param a An attribute expression.
* @param s A string value expression representing the end of the string
* value.
*
* @return The constraint that a matches s. The returned object
* will be serialized as an instance of the non-public class
*
* <a href="../../serialized-form.html#javax.management.MatchQueryExp">
* javax.management.MatchQueryExp</a>.
*/
public static QueryExp finalSubString(AttributeValueExp a, StringValueExp s) {
return new MatchQueryExp(a,
new StringValueExp("*" + escapeString(s.getValue())));
}
/**
* Returns a query expression that represents an inheritance constraint
* on an MBean class.
* <p>Example: to find MBeans that are instances of
* {@link NotificationBroadcaster}, use
* {@code Query.isInstanceOf(Query.value(NotificationBroadcaster.class.getName()))}.
* </p>
* <p>Evaluating this expression for a given
* <code>objectName includes performing {@link
* MBeanServer#isInstanceOf MBeanServer.isInstanceOf(objectName,
* ((StringValueExp)classNameValue.apply(objectName)).getValue()}.</p>
*
* @param classNameValue The {@link StringValueExp} returning the name
* of the class of which selected MBeans should be instances.
* @return a query expression that represents an inheritance
* constraint on an MBean class. The returned object will be
* serialized as an instance of the non-public class
* <a href="../../serialized-form.html#javax.management.InstanceOfQueryExp">
* javax.management.InstanceOfQueryExp</a>.
* @since 1.6
*/
public static QueryExp isInstanceOf(StringValueExp classNameValue) {
return new InstanceOfQueryExp(classNameValue);
}
/**
* Utility method to escape strings used with
* Query.{initial|any|final}SubString() methods.
*/
private static String escapeString(String s) {
if (s == null)
return null;
s = s.replace("\\", "\\\\");
s = s.replace("*", "\\*");
s = s.replace("?", "\\?");
s = s.replace("[", "\\[");
return s;
}
}
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