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package javax.management;


This class is used by the query building mechanism for isInstanceOf expressions.
@serialinclude
Since:1.6
/** * This class is used by the query building mechanism for isInstanceOf expressions. * @serial include * * @since 1.6 */
class InstanceOfQueryExp extends QueryEval implements QueryExp { /* Serial version */ private static final long serialVersionUID = -1081892073854801359L;
@serialThe StringValueExp returning the name of the class of which selected MBeans should be instances.
/** * @serial The {@link StringValueExp} returning the name of the class * of which selected MBeans should be instances. */
private StringValueExp classNameValue;
Creates a new InstanceOfExp with a specific class name.
Params:
  • classNameValue – The StringValueExp returning the name of the class of which selected MBeans should be instances.
/** * Creates a new InstanceOfExp with a specific class name. * @param classNameValue The {@link StringValueExp} returning the name of * the class of which selected MBeans should be instances. */
// We are using StringValueExp here to be consistent with other queries, // although we should actually either use a simple string (the classname) // or a ValueExp - which would allow more complex queries - like for // instance evaluating the class name from an AttributeValueExp. // As it stands - using StringValueExp instead of a simple constant string // doesn't serve any useful purpose besides offering a consistent // look & feel. public InstanceOfQueryExp(StringValueExp classNameValue) { if (classNameValue == null) { throw new IllegalArgumentException("Null class name."); } this.classNameValue = classNameValue; }
Returns the class name.
Returns:The StringValueExp returning the name of the class of which selected MBeans should be instances.
/** * Returns the class name. * @return The {@link StringValueExp} returning the name of * the class of which selected MBeans should be instances. */
public StringValueExp getClassNameValue() { return classNameValue; }
Applies the InstanceOf on a MBean.
Params:
  • name – The name of the MBean on which the InstanceOf will be applied.
Throws:
Returns: True if the MBean specified by the name is instance of the class.
/** * Applies the InstanceOf on a MBean. * * @param name The name of the MBean on which the InstanceOf will be applied. * * @return True if the MBean specified by the name is instance of the class. * @exception BadAttributeValueExpException * @exception InvalidApplicationException * @exception BadStringOperationException * @exception BadBinaryOpValueExpException */
public boolean apply(ObjectName name) throws BadStringOperationException, BadBinaryOpValueExpException, BadAttributeValueExpException, InvalidApplicationException { // Get the class name value final StringValueExp val; try { val = (StringValueExp) classNameValue.apply(name); } catch (ClassCastException x) { // Should not happen - unless someone wrongly implemented // StringValueExp.apply(). final BadStringOperationException y = new BadStringOperationException(x.toString()); y.initCause(x); throw y; } // Test whether the MBean is an instance of that class. try { return getMBeanServer().isInstanceOf(name, val.getValue()); } catch (InstanceNotFoundException infe) { return false; } }
Returns a string representation of this InstanceOfQueryExp.
Returns:a string representation of this InstanceOfQueryExp.
/** * Returns a string representation of this InstanceOfQueryExp. * @return a string representation of this InstanceOfQueryExp. */
public String toString() { return "InstanceOf " + classNameValue.toString(); } }