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655 lines
23 KiB
655 lines
23 KiB
/*
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* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.management;
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/**
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* <p>Constructs query object constraints.</p>
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*
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* <p>The MBean Server can be queried for MBeans that meet a particular
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* condition, using its {@link MBeanServer#queryNames queryNames} or
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* {@link MBeanServer#queryMBeans queryMBeans} method. The {@link QueryExp}
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* parameter to the method can be any implementation of the interface
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* {@code QueryExp}, but it is usually best to obtain the {@code QueryExp}
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* value by calling the static methods in this class. This is particularly
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* true when querying a remote MBean Server: a custom implementation of the
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* {@code QueryExp} interface might not be present in the remote MBean Server,
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* but the methods in this class return only standard classes that are
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* part of the JMX implementation.</p>
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*
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* <p>As an example, suppose you wanted to find all MBeans where the {@code
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* Enabled} attribute is {@code true} and the {@code Owner} attribute is {@code
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* "Duke"}. Here is how you could construct the appropriate {@code QueryExp} by
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* chaining together method calls:</p>
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*
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* <pre>
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* QueryExp query =
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* Query.and(Query.eq(Query.attr("Enabled"), Query.value(true)),
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* Query.eq(Query.attr("Owner"), Query.value("Duke")));
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* </pre>
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*
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* @since 1.5
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*/
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public class Query extends Object {
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/**
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* A code representing the {@link Query#gt} query. This is chiefly
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* of interest for the serialized form of queries.
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*/
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public static final int GT = 0;
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/**
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* A code representing the {@link Query#lt} query. This is chiefly
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* of interest for the serialized form of queries.
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*/
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public static final int LT = 1;
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/**
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* A code representing the {@link Query#geq} query. This is chiefly
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* of interest for the serialized form of queries.
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*/
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public static final int GE = 2;
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/**
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* A code representing the {@link Query#leq} query. This is chiefly
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* of interest for the serialized form of queries.
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*/
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public static final int LE = 3;
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/**
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* A code representing the {@link Query#eq} query. This is chiefly
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* of interest for the serialized form of queries.
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*/
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public static final int EQ = 4;
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/**
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* A code representing the {@link Query#plus} expression. This
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* is chiefly of interest for the serialized form of queries.
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*/
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public static final int PLUS = 0;
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/**
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* A code representing the {@link Query#minus} expression. This
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* is chiefly of interest for the serialized form of queries.
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*/
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public static final int MINUS = 1;
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/**
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* A code representing the {@link Query#times} expression. This
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* is chiefly of interest for the serialized form of queries.
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*/
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public static final int TIMES = 2;
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/**
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* A code representing the {@link Query#div} expression. This is
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* chiefly of interest for the serialized form of queries.
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*/
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public static final int DIV = 3;
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/**
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* Basic constructor.
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*/
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public Query() {
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}
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/**
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* Returns a query expression that is the conjunction of two other query
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* expressions.
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*
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* @param q1 A query expression.
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* @param q2 Another query expression.
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*
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* @return The conjunction of the two arguments. The returned object
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* will be serialized as an instance of the non-public class
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* <a href="../../serialized-form.html#javax.management.AndQueryExp">
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* javax.management.AndQueryExp</a>.
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*/
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public static QueryExp and(QueryExp q1, QueryExp q2) {
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return new AndQueryExp(q1, q2);
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}
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/**
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* Returns a query expression that is the disjunction of two other query
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* expressions.
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*
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* @param q1 A query expression.
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* @param q2 Another query expression.
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*
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* @return The disjunction of the two arguments. The returned object
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* will be serialized as an instance of the non-public class
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* <a href="../../serialized-form.html#javax.management.OrQueryExp">
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* javax.management.OrQueryExp</a>.
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*/
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public static QueryExp or(QueryExp q1, QueryExp q2) {
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return new OrQueryExp(q1, q2);
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}
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/**
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* Returns a query expression that represents a "greater than" constraint on
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* two values.
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*
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* @param v1 A value expression.
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* @param v2 Another value expression.
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*
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* @return A "greater than" constraint on the arguments. The
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* returned object will be serialized as an instance of the
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* non-public class
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* <a href="../../serialized-form.html#javax.management.BinaryRelQueryExp">
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* javax.management.BinaryRelQueryExp</a> with a {@code relOp} equal
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* to {@link #GT}.
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*/
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public static QueryExp gt(ValueExp v1, ValueExp v2) {
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return new BinaryRelQueryExp(GT, v1, v2);
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}
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/**
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* Returns a query expression that represents a "greater than or equal
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* to" constraint on two values.
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*
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* @param v1 A value expression.
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* @param v2 Another value expression.
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*
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* @return A "greater than or equal to" constraint on the
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* arguments. The returned object will be serialized as an
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* instance of the non-public class
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* <a href="../../serialized-form.html#javax.management.BinaryRelQueryExp">
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* javax.management.BinaryRelQueryExp</a> with a {@code relOp} equal
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* to {@link #GE}.
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*/
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public static QueryExp geq(ValueExp v1, ValueExp v2) {
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return new BinaryRelQueryExp(GE, v1, v2);
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}
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/**
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* Returns a query expression that represents a "less than or equal to"
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* constraint on two values.
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*
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* @param v1 A value expression.
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* @param v2 Another value expression.
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*
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* @return A "less than or equal to" constraint on the arguments.
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* The returned object will be serialized as an instance of the
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* non-public class
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* <a href="../../serialized-form.html#javax.management.BinaryRelQueryExp">
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* javax.management.BinaryRelQueryExp</a> with a {@code relOp} equal
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* to {@link #LE}.
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*/
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public static QueryExp leq(ValueExp v1, ValueExp v2) {
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return new BinaryRelQueryExp(LE, v1, v2);
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}
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/**
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* Returns a query expression that represents a "less than" constraint on
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* two values.
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*
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* @param v1 A value expression.
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* @param v2 Another value expression.
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*
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* @return A "less than" constraint on the arguments. The
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* returned object will be serialized as an instance of the
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* non-public class
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* <a href="../../serialized-form.html#javax.management.BinaryRelQueryExp">
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* javax.management.BinaryRelQueryExp</a> with a {@code relOp} equal
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* to {@link #LT}.
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*/
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public static QueryExp lt(ValueExp v1, ValueExp v2) {
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return new BinaryRelQueryExp(LT, v1, v2);
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}
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/**
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* Returns a query expression that represents an equality constraint on
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* two values.
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*
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* @param v1 A value expression.
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* @param v2 Another value expression.
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*
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* @return A "equal to" constraint on the arguments. The
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* returned object will be serialized as an instance of the
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* non-public class
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* <a href="../../serialized-form.html#javax.management.BinaryRelQueryExp">
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* javax.management.BinaryRelQueryExp</a> with a {@code relOp} equal
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* to {@link #EQ}.
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*/
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public static QueryExp eq(ValueExp v1, ValueExp v2) {
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return new BinaryRelQueryExp(EQ, v1, v2);
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}
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/**
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* Returns a query expression that represents the constraint that one
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* value is between two other values.
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*
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* @param v1 A value expression that is "between" v2 and v3.
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* @param v2 Value expression that represents a boundary of the constraint.
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* @param v3 Value expression that represents a boundary of the constraint.
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*
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* @return The constraint that v1 lies between v2 and v3. The
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* returned object will be serialized as an instance of the
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* non-public class
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* <a href="../../serialized-form.html#javax.management.BetweenQueryExp">
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* javax.management.BetweenQueryExp</a>.
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*/
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public static QueryExp between(ValueExp v1, ValueExp v2, ValueExp v3) {
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return new BetweenQueryExp(v1, v2, v3);
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}
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/**
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* Returns a query expression that represents a matching constraint on
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* a string argument. The matching syntax is consistent with file globbing:
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* supports "<code>?</code>", "<code>*</code>", "<code>[</code>",
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* each of which may be escaped with "<code>\</code>";
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* character classes may use "<code>!</code>" for negation and
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* "<code>-</code>" for range.
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* (<code>*</code> for any character sequence,
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* <code>?</code> for a single arbitrary character,
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* <code>[...]</code> for a character sequence).
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* For example: <code>a*b?c</code> would match a string starting
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* with the character <code>a</code>, followed
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* by any number of characters, followed by a <code>b</code>,
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* any single character, and a <code>c</code>.
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*
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* @param a An attribute expression
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* @param s A string value expression representing a matching constraint
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*
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* @return A query expression that represents the matching
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* constraint on the string argument. The returned object will
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* be serialized as an instance of the non-public class
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* <a href="../../serialized-form.html#javax.management.MatchQueryExp">
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* javax.management.MatchQueryExp</a>.
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*/
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public static QueryExp match(AttributeValueExp a, StringValueExp s) {
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return new MatchQueryExp(a, s);
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}
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/**
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* <p>Returns a new attribute expression. See {@link AttributeValueExp}
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* for a detailed description of the semantics of the expression.</p>
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*
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* <p>Evaluating this expression for a given
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* <code>objectName</code> includes performing {@link
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* MBeanServer#getAttribute MBeanServer.getAttribute(objectName,
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* name)}.</p>
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*
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* @param name The name of the attribute.
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*
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* @return An attribute expression for the attribute named {@code name}.
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*/
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public static AttributeValueExp attr(String name) {
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return new AttributeValueExp(name);
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}
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/**
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* <p>Returns a new qualified attribute expression.</p>
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*
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* <p>Evaluating this expression for a given
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* <code>objectName</code> includes performing {@link
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* MBeanServer#getObjectInstance
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* MBeanServer.getObjectInstance(objectName)} and {@link
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* MBeanServer#getAttribute MBeanServer.getAttribute(objectName,
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* name)}.</p>
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*
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* @param className The name of the class possessing the attribute.
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* @param name The name of the attribute.
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*
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* @return An attribute expression for the attribute named name.
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* The returned object will be serialized as an instance of the
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* non-public class
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* <a href="../../serialized-form.html#javax.management.QualifiedAttributeValueExp">
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* javax.management.QualifiedAttributeValueExp</a>.
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*/
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public static AttributeValueExp attr(String className, String name) {
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return new QualifiedAttributeValueExp(className, name);
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}
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/**
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* <p>Returns a new class attribute expression which can be used in any
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* Query call that expects a ValueExp.</p>
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*
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* <p>Evaluating this expression for a given
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* <code>objectName</code> includes performing {@link
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* MBeanServer#getObjectInstance
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* MBeanServer.getObjectInstance(objectName)}.</p>
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*
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* @return A class attribute expression. The returned object
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* will be serialized as an instance of the non-public class
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* <a href="../../serialized-form.html#javax.management.ClassAttributeValueExp">
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* javax.management.ClassAttributeValueExp</a>.
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*/
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public static AttributeValueExp classattr() {
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return new ClassAttributeValueExp();
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}
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/**
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* Returns a constraint that is the negation of its argument.
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*
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* @param queryExp The constraint to negate.
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*
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* @return A negated constraint. The returned object will be
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* serialized as an instance of the non-public class
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* <a href="../../serialized-form.html#javax.management.NotQueryExp">
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* javax.management.NotQueryExp</a>.
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*/
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public static QueryExp not(QueryExp queryExp) {
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return new NotQueryExp(queryExp);
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}
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/**
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* Returns an expression constraining a value to be one of an explicit list.
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*
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* @param val A value to be constrained.
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* @param valueList An array of ValueExps.
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*
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* @return A QueryExp that represents the constraint. The
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* returned object will be serialized as an instance of the
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* non-public class
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* <a href="../../serialized-form.html#javax.management.InQueryExp">
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* javax.management.InQueryExp</a>.
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*/
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public static QueryExp in(ValueExp val, ValueExp valueList[]) {
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return new InQueryExp(val, valueList);
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}
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/**
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* Returns a new string expression.
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*
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* @param val The string value.
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*
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* @return A ValueExp object containing the string argument.
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*/
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public static StringValueExp value(String val) {
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return new StringValueExp(val);
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}
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/**
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* Returns a numeric value expression that can be used in any Query call
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* that expects a ValueExp.
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*
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* @param val An instance of Number.
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*
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* @return A ValueExp object containing the argument. The
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* returned object will be serialized as an instance of the
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* non-public class
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* <a href="../../serialized-form.html#javax.management.NumericValueExp">
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* javax.management.NumericValueExp</a>.
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*/
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public static ValueExp value(Number val) {
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return new NumericValueExp(val);
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}
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/**
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* Returns a numeric value expression that can be used in any Query call
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* that expects a ValueExp.
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*
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* @param val An int value.
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*
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* @return A ValueExp object containing the argument. The
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* returned object will be serialized as an instance of the
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* non-public class
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* <a href="../../serialized-form.html#javax.management.NumericValueExp">
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* javax.management.NumericValueExp</a>.
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*/
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public static ValueExp value(int val) {
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return new NumericValueExp((long) val);
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}
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/**
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* Returns a numeric value expression that can be used in any Query call
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* that expects a ValueExp.
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*
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* @param val A long value.
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*
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* @return A ValueExp object containing the argument. The
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* returned object will be serialized as an instance of the
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* non-public class
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* <a href="../../serialized-form.html#javax.management.NumericValueExp">
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* javax.management.NumericValueExp</a>.
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*/
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public static ValueExp value(long val) {
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return new NumericValueExp(val);
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}
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/**
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* Returns a numeric value expression that can be used in any Query call
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* that expects a ValueExp.
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*
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* @param val A float value.
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*
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* @return A ValueExp object containing the argument. The
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* returned object will be serialized as an instance of the
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* non-public class
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* <a href="../../serialized-form.html#javax.management.NumericValueExp">
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* javax.management.NumericValueExp</a>.
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*/
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public static ValueExp value(float val) {
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return new NumericValueExp((double) val);
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}
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/**
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* Returns a numeric value expression that can be used in any Query call
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* that expects a ValueExp.
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*
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* @param val A double value.
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*
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* @return A ValueExp object containing the argument. The
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* returned object will be serialized as an instance of the
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* non-public class
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* <a href="../../serialized-form.html#javax.management.NumericValueExp">
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* javax.management.NumericValueExp</a>.
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*/
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public static ValueExp value(double val) {
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return new NumericValueExp(val);
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}
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/**
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* Returns a boolean value expression that can be used in any Query call
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* that expects a ValueExp.
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*
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* @param val A boolean value.
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*
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* @return A ValueExp object containing the argument. The
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* returned object will be serialized as an instance of the
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* non-public class
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* <a href="../../serialized-form.html#javax.management.BooleanValueExp">
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* javax.management.BooleanValueExp</a>.
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*/
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public static ValueExp value(boolean val) {
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return new BooleanValueExp(val);
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}
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/**
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* Returns a binary expression representing the sum of two numeric values,
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* or the concatenation of two string values.
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*
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* @param value1 The first '+' operand.
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* @param value2 The second '+' operand.
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*
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* @return A ValueExp representing the sum or concatenation of
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* the two arguments. The returned object will be serialized as
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* an instance of the non-public class
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* <a href="../../serialized-form.html#javax.management.BinaryOpValueExp">
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* javax.management.BinaryOpValueExp</a> with an {@code op} equal to
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* {@link #PLUS}.
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*/
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public static ValueExp plus(ValueExp value1, ValueExp value2) {
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return new BinaryOpValueExp(PLUS, value1, value2);
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}
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/**
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* Returns a binary expression representing the product of two numeric values.
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*
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*
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* @param value1 The first '*' operand.
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* @param value2 The second '*' operand.
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*
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* @return A ValueExp representing the product. The returned
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* object will be serialized as an instance of the non-public
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* class
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* <a href="../../serialized-form.html#javax.management.BinaryOpValueExp">
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* javax.management.BinaryOpValueExp</a> with an {@code op} equal to
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* {@link #TIMES}.
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*/
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public static ValueExp times(ValueExp value1,ValueExp value2) {
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return new BinaryOpValueExp(TIMES, value1, value2);
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}
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/**
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* Returns a binary expression representing the difference between two numeric
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* values.
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*
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|
* @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</code> 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;
|
|
}
|
|
}
|