/*
* 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
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*/
package javax.management;
import com.sun.jmx.mbeanserver.Introspector;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.util.Arrays;
import java.util.Objects;
/**
* Describes a constructor exposed by an MBean. Instances of this
* class are immutable. Subclasses may be mutable but this is not
* recommended.
*
* @since 1.5
*/
public class MBeanConstructorInfo extends MBeanFeatureInfo implements Cloneable {
/* Serial version */
static final long serialVersionUID = 4433990064191844427L;
static final MBeanConstructorInfo[] NO_CONSTRUCTORS =
new MBeanConstructorInfo[0];
/** @see MBeanInfo#arrayGettersSafe */
private final transient boolean arrayGettersSafe;
/**
* @serial The signature of the method, that is, the class names of the arguments.
*/
private final MBeanParameterInfo[] signature;
/**
* Constructs an {@code MBeanConstructorInfo} object. The
* {@link Descriptor} of the constructed object will include
* fields contributed by any annotations on the {@code
* Constructor} object that contain the {@link DescriptorKey}
* meta-annotation.
*
* @param description A human readable description of the operation.
* @param constructor The {@code java.lang.reflect.Constructor}
* object describing the MBean constructor.
*/
public MBeanConstructorInfo(String description, Constructor<?> constructor) {
this(constructor.getName(), description,
constructorSignature(constructor),
Introspector.descriptorForElement(constructor));
}
/**
* Constructs an {@code MBeanConstructorInfo} object.
*
* @param name The name of the constructor.
* @param signature {@code MBeanParameterInfo} objects
* describing the parameters(arguments) of the constructor. This
* may be null with the same effect as a zero-length array.
* @param description A human readable description of the constructor.
*/
public MBeanConstructorInfo(String name,
String description,
MBeanParameterInfo[] signature) {
this(name, description, signature, null);
}
/**
* Constructs an {@code MBeanConstructorInfo} object.
*
* @param name The name of the constructor.
* @param signature {@code MBeanParameterInfo} objects
* describing the parameters(arguments) of the constructor. This
* may be null with the same effect as a zero-length array.
* @param description A human readable description of the constructor.
* @param descriptor The descriptor for the constructor. This may be null
* which is equivalent to an empty descriptor.
*
* @since 1.6
*/
public MBeanConstructorInfo(String name,
String description,
MBeanParameterInfo[] signature,
Descriptor descriptor) {
super(name, description, descriptor);
if (signature == null || signature.length == 0)
signature = MBeanParameterInfo.NO_PARAMS;
else
signature = signature.clone();
this.signature = signature;
this.arrayGettersSafe =
MBeanInfo.arrayGettersSafe(this.getClass(),
MBeanConstructorInfo.class);
}
/**
* <p>Returns a shallow clone of this instance. The clone is
* obtained by simply calling {@code super.clone()}, thus calling
* the default native shallow cloning mechanism implemented by
* {@code Object.clone()}. No deeper cloning of any internal
* field is made.</p>
*
* <p>Since this class is immutable, cloning is chiefly of
* interest to subclasses.</p>
*/
public Object clone () {
try {
return super.clone() ;
} catch (CloneNotSupportedException e) {
// should not happen as this class is cloneable
return null;
}
}
/**
* <p>Returns the list of parameters for this constructor. Each
* parameter is described by an {@code MBeanParameterInfo}
* object.</p>
*
* <p>The returned array is a shallow copy of the internal array,
* which means that it is a copy of the internal array of
* references to the {@code MBeanParameterInfo} objects but
* that each referenced {@code MBeanParameterInfo} object is
* not copied.</p>
*
* @return An array of {@code MBeanParameterInfo} objects.
*/
public MBeanParameterInfo[] getSignature() {
if (signature.length == 0)
return signature;
else
return signature.clone();
}
private MBeanParameterInfo[] fastGetSignature() {
if (arrayGettersSafe)
return signature;
else
return getSignature();
}
public String toString() {
return
getClass().getName() + "[" +
"description=" + getDescription() + ", " +
"name=" + getName() + ", " +
"signature=" + Arrays.asList(fastGetSignature()) + ", " +
"descriptor=" + getDescriptor() +
"]";
}
/**
* Compare this MBeanConstructorInfo to another.
*
* @param o the object to compare to.
*
* @return true if and only if {@code o} is an MBeanConstructorInfo such
* that its {@link #getName()}, {@link #getDescription()},
* {@link #getSignature()}, and {@link #getDescriptor()}
* values are equal (not necessarily
* identical) to those of this MBeanConstructorInfo. Two
* signature arrays are equal if their elements are pairwise
* equal.
*/
public boolean equals(Object o) {
if (o == this)
return true;
if (!(o instanceof MBeanConstructorInfo))
return false;
MBeanConstructorInfo p = (MBeanConstructorInfo) o;
return (Objects.equals(p.getName(), getName()) &&
Objects.equals(p.getDescription(), getDescription()) &&
Arrays.equals(p.fastGetSignature(), fastGetSignature()) &&
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