Class Query

java.lang.Object
- javax.management.Query

public class Query
extends Object

Constructs query object constraints.

The MBean Server can be queried for MBeans that meet a particular condition, using its queryNames or queryMBeans method. The QueryExp parameter to the method can be any implementation of the interface QueryExp, but it is usually best to obtain the 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 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.

As an example, suppose you wanted to find all MBeans where the Enabled attribute is true and the Owner attribute is "Duke". Here is how you could construct the appropriate QueryExp by chaining together method calls:

QueryExp query =
     Query.and(Query.eq(Query.attr("Enabled"), Query.value(true)),
               Query.eq(Query.attr("Owner"), Query.value("Duke")));

Since:: 1.5

Fields

Modifier and Type	Field	Description
`static int`	`DIV`	A code representing the `div(javax.management.ValueExp, javax.management.ValueExp)` expression.
`static int`	`EQ`	A code representing the `eq(javax.management.ValueExp, javax.management.ValueExp)` query.
`static int`	`GE`	A code representing the `geq(javax.management.ValueExp, javax.management.ValueExp)` query.
`static int`	`GT`	A code representing the `gt(javax.management.ValueExp, javax.management.ValueExp)` query.
`static int`	`LE`	A code representing the `leq(javax.management.ValueExp, javax.management.ValueExp)` query.
`static int`	`LT`	A code representing the `lt(javax.management.ValueExp, javax.management.ValueExp)` query.
`static int`	`MINUS`	A code representing the `minus(javax.management.ValueExp, javax.management.ValueExp)` expression.
`static int`	`PLUS`	A code representing the `plus(javax.management.ValueExp, javax.management.ValueExp)` expression.
`static int`	`TIMES`	A code representing the `times(javax.management.ValueExp, javax.management.ValueExp)` expression.

Constructors

Constructor	Description
`Query()`	Basic constructor.

Methods

Modifier and Type	Method	Description
`static QueryExp`	`and(QueryExp q1, QueryExp q2)`	Returns a query expression that is the conjunction of two other query expressions.
`static QueryExp`	`anySubString(AttributeValueExp a, StringValueExp s)`	Returns a query expression that represents a matching constraint on a string argument.
`static AttributeValueExp`	`attr(String name)`	Returns a new attribute expression.
`static AttributeValueExp`	`attr(String className, String name)`	Returns a new qualified attribute expression.
`static QueryExp`	`between(ValueExp v1, ValueExp v2, ValueExp v3)`	Returns a query expression that represents the constraint that one value is between two other values.
`static AttributeValueExp`	`classattr()`	Returns a new class attribute expression which can be used in any Query call that expects a ValueExp.
`static ValueExp`	`div(ValueExp value1, ValueExp value2)`	Returns a binary expression representing the quotient of two numeric values.
`static QueryExp`	`eq(ValueExp v1, ValueExp v2)`	Returns a query expression that represents an equality constraint on two values.
`static QueryExp`	`finalSubString(AttributeValueExp a, StringValueExp s)`	Returns a query expression that represents a matching constraint on a string argument.
`static QueryExp`	`geq(ValueExp v1, ValueExp v2)`	Returns a query expression that represents a "greater than or equal to" constraint on two values.
`static QueryExp`	`gt(ValueExp v1, ValueExp v2)`	Returns a query expression that represents a "greater than" constraint on two values.
`static QueryExp`	`in(ValueExp val, ValueExp[] valueList)`	Returns an expression constraining a value to be one of an explicit list.
`static QueryExp`	`initialSubString(AttributeValueExp a, StringValueExp s)`	Returns a query expression that represents a matching constraint on a string argument.
`static QueryExp`	`isInstanceOf(StringValueExp classNameValue)`	Returns a query expression that represents an inheritance constraint on an MBean class.
`static QueryExp`	`leq(ValueExp v1, ValueExp v2)`	Returns a query expression that represents a "less than or equal to" constraint on two values.
`static QueryExp`	`lt(ValueExp v1, ValueExp v2)`	Returns a query expression that represents a "less than" constraint on two values.
`static QueryExp`	`match(AttributeValueExp a, StringValueExp s)`	Returns a query expression that represents a matching constraint on a string argument.
`static ValueExp`	`minus(ValueExp value1, ValueExp value2)`	Returns a binary expression representing the difference between two numeric values.
`static QueryExp`	`not(QueryExp queryExp)`	Returns a constraint that is the negation of its argument.
`static QueryExp`	`or(QueryExp q1, QueryExp q2)`	Returns a query expression that is the disjunction of two other query expressions.
`static ValueExp`	`plus(ValueExp value1, ValueExp value2)`	Returns a binary expression representing the sum of two numeric values, or the concatenation of two string values.
`static ValueExp`	`times(ValueExp value1, ValueExp value2)`	Returns a binary expression representing the product of two numeric values.
`static ValueExp`	`value(boolean val)`	Returns a boolean value expression that can be used in any Query call that expects a ValueExp.
`static ValueExp`	`value(double val)`	Returns a numeric value expression that can be used in any Query call that expects a ValueExp.
`static ValueExp`	`value(float val)`	Returns a numeric value expression that can be used in any Query call that expects a ValueExp.
`static ValueExp`	`value(int val)`	Returns a numeric value expression that can be used in any Query call that expects a ValueExp.
`static ValueExp`	`value(long val)`	Returns a numeric value expression that can be used in any Query call that expects a ValueExp.
`static ValueExp`	`value(Number val)`	Returns a numeric value expression that can be used in any Query call that expects a ValueExp.
`static StringValueExp`	`value(String val)`	Returns a new string expression.

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Fields

GT

public static final int GT

A code representing the gt(javax.management.ValueExp, javax.management.ValueExp) query. This is chiefly of interest for the serialized form of queries.

See Also:: Constant Field Values

LT

public static final int LT

A code representing the lt(javax.management.ValueExp, javax.management.ValueExp) query. This is chiefly of interest for the serialized form of queries.

See Also:: Constant Field Values

GE

public static final int GE

A code representing the geq(javax.management.ValueExp, javax.management.ValueExp) query. This is chiefly of interest for the serialized form of queries.

See Also:: Constant Field Values

LE

public static final int LE

A code representing the leq(javax.management.ValueExp, javax.management.ValueExp) query. This is chiefly of interest for the serialized form of queries.

See Also:: Constant Field Values

EQ

public static final int EQ

A code representing the eq(javax.management.ValueExp, javax.management.ValueExp) query. This is chiefly of interest for the serialized form of queries.

See Also:: Constant Field Values

PLUS

public static final int PLUS

A code representing the plus(javax.management.ValueExp, javax.management.ValueExp) expression. This is chiefly of interest for the serialized form of queries.

See Also:: Constant Field Values

MINUS

public static final int MINUS

A code representing the minus(javax.management.ValueExp, javax.management.ValueExp) expression. This is chiefly of interest for the serialized form of queries.

See Also:: Constant Field Values

TIMES

public static final int TIMES

A code representing the times(javax.management.ValueExp, javax.management.ValueExp) expression. This is chiefly of interest for the serialized form of queries.

See Also:: Constant Field Values

DIV

public static final int DIV

A code representing the div(javax.management.ValueExp, javax.management.ValueExp) expression. This is chiefly of interest for the serialized form of queries.

See Also:: Constant Field Values

Constructors

Query

public Query()

Basic constructor.

Methods

and

public static QueryExp and(QueryExp q1,
                           QueryExp q2)

Returns a query expression that is the conjunction of two other query expressions.

Parameters:: q1 - A query expression.; q2 - Another query expression.
Returns:: The conjunction of the two arguments. The returned object will be serialized as an instance of the non-public class javax.management.AndQueryExp.

or

public static QueryExp or(QueryExp q1,
                          QueryExp q2)

Returns a query expression that is the disjunction of two other query expressions.

Parameters:: q1 - A query expression.; q2 - Another query expression.
Returns:: The disjunction of the two arguments. The returned object will be serialized as an instance of the non-public class javax.management.OrQueryExp.

gt

public static QueryExp gt(ValueExp v1,
                          ValueExp v2)

Returns a query expression that represents a "greater than" constraint on two values.

Parameters:: v1 - A value expression.; v2 - Another value expression.
Returns:: A "greater than" constraint on the arguments. The returned object will be serialized as an instance of the non-public class javax.management.BinaryRelQueryExp with a relOp equal to GT.

geq

public static QueryExp geq(ValueExp v1,
                           ValueExp v2)

Returns a query expression that represents a "greater than or equal to" constraint on two values.

Parameters:: v1 - A value expression.; v2 - Another value expression.
Returns:: A "greater than or equal to" constraint on the arguments. The returned object will be serialized as an instance of the non-public class javax.management.BinaryRelQueryExp with a relOp equal to GE.

leq

public static QueryExp leq(ValueExp v1,
                           ValueExp v2)

Returns a query expression that represents a "less than or equal to" constraint on two values.

Parameters:: v1 - A value expression.; v2 - Another value expression.
Returns:: A "less than or equal to" constraint on the arguments. The returned object will be serialized as an instance of the non-public class javax.management.BinaryRelQueryExp with a relOp equal to LE.

lt

public static QueryExp lt(ValueExp v1,
                          ValueExp v2)

Returns a query expression that represents a "less than" constraint on two values.

Parameters:: v1 - A value expression.; v2 - Another value expression.
Returns:: A "less than" constraint on the arguments. The returned object will be serialized as an instance of the non-public class javax.management.BinaryRelQueryExp with a relOp equal to LT.

eq

public static QueryExp eq(ValueExp v1,
                          ValueExp v2)

Returns a query expression that represents an equality constraint on two values.

Parameters:: v1 - A value expression.; v2 - Another value expression.
Returns:: A "equal to" constraint on the arguments. The returned object will be serialized as an instance of the non-public class javax.management.BinaryRelQueryExp with a relOp equal to EQ.

between

public static QueryExp between(ValueExp v1,
                               ValueExp v2,
                               ValueExp v3)

Returns a query expression that represents the constraint that one value is between two other values.

Parameters:: v1 - A value expression that is "between" v2 and v3.; v2 - Value expression that represents a boundary of the constraint.; v3 - Value expression that represents a boundary of the constraint.
Returns:: The constraint that v1 lies between v2 and v3. The returned object will be serialized as an instance of the non-public class javax.management.BetweenQueryExp.

match

public static QueryExp match(AttributeValueExp a,
                             StringValueExp s)

Returns a query expression that represents a matching constraint on a string argument. The matching syntax is consistent with file globbing: supports "?", "*", "[", each of which may be escaped with "\"; character classes may use "!" for negation and "-" for range. (* for any character sequence, ? for a single arbitrary character, [...] for a character sequence). For example: a*b?c would match a string starting with the character a, followed by any number of characters, followed by a b, any single character, and a c.

Parameters:: a - An attribute expression; s - A string value expression representing a matching constraint
Returns:: 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 javax.management.MatchQueryExp.

attr

public static AttributeValueExp attr(String name)

Returns a new attribute expression. See AttributeValueExp for a detailed description of the semantics of the expression.

Evaluating this expression for a given objectName includes performing MBeanServer.getAttribute(objectName, name).

Parameters:: name - The name of the attribute.
Returns:: An attribute expression for the attribute named name.

attr

public static AttributeValueExp attr(String className,
                                     String name)

Returns a new qualified attribute expression.

Evaluating this expression for a given objectName includes performing MBeanServer.getObjectInstance(objectName) and MBeanServer.getAttribute(objectName, name).

Parameters:: className - The name of the class possessing the attribute.; name - The name of the attribute.
Returns:: An attribute expression for the attribute named name. The returned object will be serialized as an instance of the non-public class javax.management.QualifiedAttributeValueExp.

classattr

public static AttributeValueExp classattr()

Returns a new class attribute expression which can be used in any Query call that expects a ValueExp.

Evaluating this expression for a given objectName includes performing MBeanServer.getObjectInstance(objectName).

Returns:: A class attribute expression. The returned object will be serialized as an instance of the non-public class javax.management.ClassAttributeValueExp.

not

public static QueryExp not(QueryExp queryExp)

Returns a constraint that is the negation of its argument.

Parameters:: queryExp - The constraint to negate.
Returns:: A negated constraint. The returned object will be serialized as an instance of the non-public class javax.management.NotQueryExp.

in

public static QueryExp in(ValueExp val,
                          ValueExp[] valueList)

Returns an expression constraining a value to be one of an explicit list.

Parameters:: val - A value to be constrained.; valueList - An array of ValueExps.
Returns:: A QueryExp that represents the constraint. The returned object will be serialized as an instance of the non-public class javax.management.InQueryExp.

value

public static StringValueExp value(String val)

Returns a new string expression.

Parameters:: val - The string value.
Returns:: A ValueExp object containing the string argument.